/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % TTTTT H H RRRR EEEEE SSSSS H H OOO L DDDD % % T H H R R E SS H H O O L D D % % T HHHHH RRRR EEE SSS HHHHH O O L D D % % T H H R R E SS H H O O L D D % % T H H R R EEEEE SSSSS H H OOO LLLLL DDDD % % % % % % MagickCore Image Threshold Methods % % % % Software Design % % John Cristy % % October 1996 % % % % % % Copyright 1999-2012 ImageMagick Studio LLC, a non-profit organization % % dedicated to making software imaging solutions freely available. % % % % You may not use this file except in compliance with the License. You may % % obtain a copy of the License at % % % % http://www.imagemagick.org/script/license.php % % % % Unless required by applicable law or agreed to in writing, software % % distributed under the License is distributed on an "AS IS" BASIS, % % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % % See the License for the specific language governing permissions and % % limitations under the License. % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % */ /* Include declarations. */ #include "MagickCore/studio.h" #include "MagickCore/property.h" #include "MagickCore/blob.h" #include "MagickCore/cache-view.h" #include "MagickCore/color.h" #include "MagickCore/color-private.h" #include "MagickCore/colormap.h" #include "MagickCore/colorspace.h" #include "MagickCore/colorspace-private.h" #include "MagickCore/configure.h" #include "MagickCore/constitute.h" #include "MagickCore/decorate.h" #include "MagickCore/draw.h" #include "MagickCore/enhance.h" #include "MagickCore/exception.h" #include "MagickCore/exception-private.h" #include "MagickCore/effect.h" #include "MagickCore/fx.h" #include "MagickCore/gem.h" #include "MagickCore/geometry.h" #include "MagickCore/image-private.h" #include "MagickCore/list.h" #include "MagickCore/log.h" #include "MagickCore/memory_.h" #include "MagickCore/monitor.h" #include "MagickCore/monitor-private.h" #include "MagickCore/montage.h" #include "MagickCore/option.h" #include "MagickCore/pixel-accessor.h" #include "MagickCore/quantize.h" #include "MagickCore/quantum.h" #include "MagickCore/random_.h" #include "MagickCore/random-private.h" #include "MagickCore/resize.h" #include "MagickCore/resource_.h" #include "MagickCore/segment.h" #include "MagickCore/shear.h" #include "MagickCore/signature-private.h" #include "MagickCore/string_.h" #include "MagickCore/string-private.h" #include "MagickCore/thread-private.h" #include "MagickCore/threshold.h" #include "MagickCore/token.h" #include "MagickCore/transform.h" #include "MagickCore/xml-tree.h" #include "MagickCore/xml-tree-private.h" /* Define declarations. */ #define ThresholdsFilename "thresholds.xml" /* Typedef declarations. */ struct _ThresholdMap { char *map_id, *description; size_t width, height; ssize_t divisor, *levels; }; /* Forward declarations. */ static ThresholdMap *GetThresholdMapFile(const char *,const char *,const char *,ExceptionInfo *); /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % A d a p t i v e T h r e s h o l d I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % AdaptiveThresholdImage() selects an individual threshold for each pixel % based on the range of intensity values in its local neighborhood. This % allows for thresholding of an image whose global intensity histogram % doesn't contain distinctive peaks. % % The format of the AdaptiveThresholdImage method is: % % Image *AdaptiveThresholdImage(const Image *image,const size_t width, % const size_t height,const double bias,ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o width: the width of the local neighborhood. % % o height: the height of the local neighborhood. % % o bias: the mean bias. % % o exception: return any errors or warnings in this structure. % */ MagickExport Image *AdaptiveThresholdImage(const Image *image, const size_t width,const size_t height,const double bias, ExceptionInfo *exception) { #define AdaptiveThresholdImageTag "AdaptiveThreshold/Image" CacheView *image_view, *threshold_view; Image *threshold_image; MagickBooleanType status; MagickOffsetType progress; MagickSizeType number_pixels; ssize_t y; /* Initialize threshold image attributes. */ assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickSignature); if ((width % 2) == 0) ThrowImageException(OptionError,"KernelWidthMustBeAnOddNumber"); threshold_image=CloneImage(image,image->columns,image->rows,MagickTrue, exception); if (threshold_image == (Image *) NULL) return((Image *) NULL); status=SetImageStorageClass(threshold_image,DirectClass,exception); if (status == MagickFalse) { threshold_image=DestroyImage(threshold_image); return((Image *) NULL); } /* Threshold image. */ status=MagickTrue; progress=0; number_pixels=(MagickSizeType) width*height; image_view=AcquireCacheView(image); threshold_view=AcquireCacheView(threshold_image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,4) shared(progress,status) #endif for (y=0; y < (ssize_t) image->rows; y++) { register const Quantum *restrict p; register Quantum *restrict q; register ssize_t x; ssize_t center; if (status == MagickFalse) continue; p=GetCacheViewVirtualPixels(image_view,-((ssize_t) width/2L),y-(ssize_t) (height/2L),image->columns+width,height,exception); q=QueueCacheViewAuthenticPixels(threshold_view,0,y,threshold_image->columns, 1,exception); if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL)) { status=MagickFalse; continue; } center=(ssize_t) GetPixelChannels(image)*(image->columns+width)*(height/2L)+ GetPixelChannels(image)*(width/2); for (x=0; x < (ssize_t) image->columns; x++) { register ssize_t i; if (GetPixelMask(image,p) != 0) { p+=GetPixelChannels(image); q+=GetPixelChannels(threshold_image); continue; } for (i=0; i < (ssize_t) GetPixelChannels(image); i++) { MagickRealType mean, pixel; PixelChannel channel; PixelTrait threshold_traits, traits; register const Quantum *restrict pixels; register ssize_t u; ssize_t v; channel=GetPixelChannelMapChannel(image,i); traits=GetPixelChannelMapTraits(image,channel); threshold_traits=GetPixelChannelMapTraits(threshold_image,channel); if ((traits == UndefinedPixelTrait) || (threshold_traits == UndefinedPixelTrait)) continue; if ((threshold_traits & CopyPixelTrait) != 0) { SetPixelChannel(threshold_image,channel,p[center+i],q); continue; } pixels=p; pixel=0.0; for (v=0; v < (ssize_t) height; v++) { for (u=0; u < (ssize_t) width; u++) { pixel+=pixels[i]; pixels+=GetPixelChannels(image); } pixels+=image->columns*GetPixelChannels(image); } mean=(MagickRealType) (pixel/number_pixels+bias); SetPixelChannel(threshold_image,channel,(Quantum) ((MagickRealType) p[center+i] <= mean ? 0 : QuantumRange),q); } p+=GetPixelChannels(image); q+=GetPixelChannels(threshold_image); } if (SyncCacheViewAuthenticPixels(threshold_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_AdaptiveThresholdImage) #endif proceed=SetImageProgress(image,AdaptiveThresholdImageTag,progress++, image->rows); if (proceed == MagickFalse) status=MagickFalse; } } threshold_image->type=image->type; threshold_view=DestroyCacheView(threshold_view); image_view=DestroyCacheView(image_view); if (status == MagickFalse) threshold_image=DestroyImage(threshold_image); return(threshold_image); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % B i l e v e l I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % BilevelImage() changes the value of individual pixels based on the % intensity of each pixel channel. The result is a high-contrast image. % % More precisely each channel value of the image is 'thresholded' so that if % it is equal to or less than the given value it is set to zero, while any % value greater than that give is set to it maximum or QuantumRange. % % This function is what is used to implement the "-threshold" operator for % the command line API. % % If the default channel setting is given the image is thresholded using just % the gray 'intensity' of the image, rather than the individual channels. % % The format of the BilevelImage method is: % % MagickBooleanType BilevelImage(Image *image,const double threshold, % ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o threshold: define the threshold values. % % o exception: return any errors or warnings in this structure. % % Aside: You can get the same results as operator using LevelImages() % with the 'threshold' value for both the black_point and the white_point. % */ MagickExport MagickBooleanType BilevelImage(Image *image,const double threshold, ExceptionInfo *exception) { #define ThresholdImageTag "Threshold/Image" CacheView *image_view; MagickBooleanType status; MagickOffsetType progress; ssize_t y; assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse) return(MagickFalse); /* Bilevel threshold image. */ status=MagickTrue; progress=0; image_view=AcquireCacheView(image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,8) shared(progress,status) #endif for (y=0; y < (ssize_t) image->rows; y++) { register ssize_t x; register Quantum *restrict q; if (status == MagickFalse) continue; q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) { status=MagickFalse; continue; } for (x=0; x < (ssize_t) image->columns; x++) { register ssize_t i; if (GetPixelMask(image,q) != 0) { q+=GetPixelChannels(image); continue; } for (i=0; i < (ssize_t) GetPixelChannels(image); i++) { PixelChannel channel; PixelTrait traits; channel=GetPixelChannelMapChannel(image,i); traits=GetPixelChannelMapTraits(image,channel); if ((traits & UpdatePixelTrait) == 0) continue; q[i]=(Quantum) ((MagickRealType) q[i] <= threshold ? 0 : QuantumRange); } q+=GetPixelChannels(image); } if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_BilevelImage) #endif proceed=SetImageProgress(image,ThresholdImageTag,progress++, image->rows); if (proceed == MagickFalse) status=MagickFalse; } } image_view=DestroyCacheView(image_view); return(status); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % B l a c k T h r e s h o l d I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % BlackThresholdImage() is like ThresholdImage() but forces all pixels below % the threshold into black while leaving all pixels at or above the threshold % unchanged. % % The format of the BlackThresholdImage method is: % % MagickBooleanType BlackThresholdImage(Image *image, % const char *threshold,ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o threshold: define the threshold value. % % o exception: return any errors or warnings in this structure. % */ MagickExport MagickBooleanType BlackThresholdImage(Image *image, const char *thresholds,ExceptionInfo *exception) { #define ThresholdImageTag "Threshold/Image" #define BlackThreshold(pixel,threshold_percentage) \ if (pixel < threshold_percentage) pixel=0; CacheView *image_view; GeometryInfo geometry_info; MagickBooleanType status; MagickOffsetType progress; PixelInfo threshold_percentage; MagickStatusType flags; ssize_t y; assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); if (thresholds == (const char *) NULL) return(MagickTrue); if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse) return(MagickFalse); if (IsGrayColorspace(image->colorspace) != MagickFalse) (void) TransformImageColorspace(image,sRGBColorspace,exception); GetPixelInfo(image,&threshold_percentage); flags=ParseGeometry(thresholds,&geometry_info); threshold_percentage.red=geometry_info.rho; threshold_percentage.green=geometry_info.rho; threshold_percentage.blue=geometry_info.rho; threshold_percentage.black=geometry_info.rho; threshold_percentage.alpha=100.0; if ((flags & SigmaValue) != 0) threshold_percentage.green=geometry_info.sigma; if ((flags & XiValue) != 0) threshold_percentage.blue=geometry_info.xi; if ((flags & PsiValue) != 0) threshold_percentage.alpha=geometry_info.psi; if (threshold_percentage.colorspace == CMYKColorspace) { if ((flags & PsiValue) != 0) threshold_percentage.black=geometry_info.psi; if ((flags & ChiValue) != 0) threshold_percentage.alpha=geometry_info.chi; } /* White threshold image. */ status=MagickTrue; progress=0; image_view=AcquireCacheView(image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,8) shared(progress,status) #endif for (y=0; y < (ssize_t) image->rows; y++) { PixelInfo pixel; register ssize_t x; register Quantum *restrict q; if (status == MagickFalse) continue; q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) { status=MagickFalse; continue; } GetPixelInfo(image,&pixel); for (x=0; x < (ssize_t) image->columns; x++) { if (GetPixelMask(image,q) != 0) { q+=GetPixelChannels(image); continue; } GetPixelInfoPixel(image,q,&pixel); BlackThreshold(pixel.red,threshold_percentage.red); BlackThreshold(pixel.green,threshold_percentage.green); BlackThreshold(pixel.blue,threshold_percentage.blue); BlackThreshold(pixel.black,threshold_percentage.black); BlackThreshold(pixel.alpha,threshold_percentage.alpha); SetPixelInfoPixel(image,&pixel,q); q+=GetPixelChannels(image); } if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_WhiteThresholdImage) #endif proceed=SetImageProgress(image,ThresholdImageTag,progress++, image->rows); if (proceed == MagickFalse) status=MagickFalse; } } image_view=DestroyCacheView(image_view); return(status); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % C l a m p I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % ClampImage() restricts the color range from 0 to the quantum depth. % % The format of the ClampImage method is: % % MagickBooleanType ClampImage(Image *image,ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o exception: return any errors or warnings in this structure. % */ static inline Quantum ClampToUnsignedQuantum(const Quantum quantum) { #if defined(MAGICKCORE_HDRI_SUPPORT) if (quantum <= 0) return(0); if (quantum >= QuantumRange) return(QuantumRange); return(quantum); #else return(quantum); #endif } MagickExport MagickBooleanType ClampImage(Image *image,ExceptionInfo *exception) { #define ClampImageTag "Clamp/Image" CacheView *image_view; MagickBooleanType status; MagickOffsetType progress; ssize_t y; assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); if (image->storage_class == PseudoClass) { register ssize_t i; register PixelInfo *restrict q; q=image->colormap; for (i=0; i < (ssize_t) image->colors; i++) { q->red=(double) ClampToUnsignedQuantum(ClampToQuantum(q->red)); q->green=(double) ClampToUnsignedQuantum(ClampToQuantum(q->green)); q->blue=(double) ClampToUnsignedQuantum(ClampToQuantum(q->blue)); q->alpha=(double) ClampToUnsignedQuantum(ClampToQuantum(q->alpha)); q++; } return(SyncImage(image,exception)); } /* Clamp image. */ status=MagickTrue; progress=0; image_view=AcquireCacheView(image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,8) shared(progress,status) #endif for (y=0; y < (ssize_t) image->rows; y++) { register ssize_t x; register Quantum *restrict q; if (status == MagickFalse) continue; q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) { status=MagickFalse; continue; } for (x=0; x < (ssize_t) image->columns; x++) { register ssize_t i; if (GetPixelMask(image,q) != 0) { q+=GetPixelChannels(image); continue; } for (i=0; i < (ssize_t) GetPixelChannels(image); i++) { PixelChannel channel; PixelTrait traits; channel=GetPixelChannelMapChannel(image,i); traits=GetPixelChannelMapTraits(image,channel); if (traits == UndefinedPixelTrait) continue; q[i]=ClampToUnsignedQuantum(q[i]); } q+=GetPixelChannels(image); } if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_ClampImage) #endif proceed=SetImageProgress(image,ClampImageTag,progress++, image->rows); if (proceed == MagickFalse) status=MagickFalse; } } image_view=DestroyCacheView(image_view); return(status); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % D e s t r o y T h r e s h o l d M a p % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % DestroyThresholdMap() de-allocate the given ThresholdMap % % The format of the ListThresholdMaps method is: % % ThresholdMap *DestroyThresholdMap(Threshold *map) % % A description of each parameter follows. % % o map: Pointer to the Threshold map to destroy % */ MagickExport ThresholdMap *DestroyThresholdMap(ThresholdMap *map) { assert(map != (ThresholdMap *) NULL); if (map->map_id != (char *) NULL) map->map_id=DestroyString(map->map_id); if (map->description != (char *) NULL) map->description=DestroyString(map->description); if (map->levels != (ssize_t *) NULL) map->levels=(ssize_t *) RelinquishMagickMemory(map->levels); map=(ThresholdMap *) RelinquishMagickMemory(map); return(map); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % G e t T h r e s h o l d M a p % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % GetThresholdMap() loads and searches one or more threshold map files for the % map matching the given name or alias. % % The format of the GetThresholdMap method is: % % ThresholdMap *GetThresholdMap(const char *map_id, % ExceptionInfo *exception) % % A description of each parameter follows. % % o map_id: ID of the map to look for. % % o exception: return any errors or warnings in this structure. % */ MagickExport ThresholdMap *GetThresholdMap(const char *map_id, ExceptionInfo *exception) { const StringInfo *option; LinkedListInfo *options; ThresholdMap *map; map=(ThresholdMap *)NULL; options=GetConfigureOptions(ThresholdsFilename,exception); while ((option=(const StringInfo *) GetNextValueInLinkedList(options)) != (const StringInfo *) NULL && (map == (ThresholdMap *) NULL)) map=GetThresholdMapFile((const char *) GetStringInfoDatum(option), GetStringInfoPath(option),map_id,exception); options=DestroyConfigureOptions(options); return(map); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % + G e t T h r e s h o l d M a p F i l e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % GetThresholdMapFile() look for a given threshold map name or alias in the % given XML file data, and return the allocated the map when found. % % The format of the ListThresholdMaps method is: % % ThresholdMap *GetThresholdMap(const char *xml,const char *filename, % const char *map_id,ExceptionInfo *exception) % % A description of each parameter follows. % % o xml: The threshold map list in XML format. % % o filename: The threshold map XML filename. % % o map_id: ID of the map to look for in XML list. % % o exception: return any errors or warnings in this structure. % */ static ThresholdMap *GetThresholdMapFile(const char *xml, const char *filename,const char *map_id,ExceptionInfo *exception) { char *p; const char *attribute, *content; double value; register ssize_t i; ThresholdMap *map; XMLTreeInfo *description, *levels, *threshold, *thresholds; (void) LogMagickEvent(ConfigureEvent,GetMagickModule(), "Loading threshold map file \"%s\" ...",filename); map=(ThresholdMap *) NULL; thresholds=NewXMLTree(xml,exception); if (thresholds == (XMLTreeInfo *) NULL) return(map); for (threshold=GetXMLTreeChild(thresholds,"threshold"); threshold != (XMLTreeInfo *) NULL; threshold=GetNextXMLTreeTag(threshold)) { attribute=GetXMLTreeAttribute(threshold,"map"); if ((attribute != (char *) NULL) && (LocaleCompare(map_id,attribute) == 0)) break; attribute=GetXMLTreeAttribute(threshold,"alias"); if ((attribute != (char *) NULL) && (LocaleCompare(map_id,attribute) == 0)) break; } if (threshold == (XMLTreeInfo *) NULL) return(map); description=GetXMLTreeChild(threshold,"description"); if (description == (XMLTreeInfo *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingElement", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); return(map); } levels=GetXMLTreeChild(threshold,"levels"); if (levels == (XMLTreeInfo *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingElement", ", map \"%s\"", map_id); thresholds=DestroyXMLTree(thresholds); return(map); } map=(ThresholdMap *) AcquireMagickMemory(sizeof(ThresholdMap)); if (map == (ThresholdMap *) NULL) ThrowFatalException(ResourceLimitFatalError,"UnableToAcquireThresholdMap"); map->map_id=(char *) NULL; map->description=(char *) NULL; map->levels=(ssize_t *) NULL; attribute=GetXMLTreeAttribute(threshold,"map"); if (attribute != (char *) NULL) map->map_id=ConstantString(attribute); content=GetXMLTreeContent(description); if (content != (char *) NULL) map->description=ConstantString(content); attribute=GetXMLTreeAttribute(levels,"width"); if (attribute == (char *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingAttribute", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } map->width=StringToUnsignedLong(attribute); if (map->width == 0) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlInvalidAttribute", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } attribute=GetXMLTreeAttribute(levels,"height"); if (attribute == (char *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingAttribute", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } map->height=StringToUnsignedLong(attribute); if (map->height == 0) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlInvalidAttribute", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } attribute=GetXMLTreeAttribute(levels,"divisor"); if (attribute == (char *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingAttribute", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } map->divisor=(ssize_t) StringToLong(attribute); if (map->divisor < 2) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlInvalidAttribute", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } content=GetXMLTreeContent(levels); if (content == (char *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingContent", ", map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } map->levels=(ssize_t *) AcquireQuantumMemory((size_t) map->width,map->height* sizeof(*map->levels)); if (map->levels == (ssize_t *) NULL) ThrowFatalException(ResourceLimitFatalError,"UnableToAcquireThresholdMap"); for (i=0; i < (ssize_t) (map->width*map->height); i++) { map->levels[i]=(ssize_t) strtol(content,&p,10); if (p == content) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlInvalidContent", " too few values, map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } if ((map->levels[i] < 0) || (map->levels[i] > map->divisor)) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlInvalidContent", " %.20g out of range, map \"%s\"", (double) map->levels[i],map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } content=p; } value=(double) strtol(content,&p,10); (void) value; if (p != content) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlInvalidContent", " too many values, map \"%s\"",map_id); thresholds=DestroyXMLTree(thresholds); map=DestroyThresholdMap(map); return(map); } thresholds=DestroyXMLTree(thresholds); return(map); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % + L i s t T h r e s h o l d M a p F i l e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % ListThresholdMapFile() lists the threshold maps and their descriptions % in the given XML file data. % % The format of the ListThresholdMaps method is: % % MagickBooleanType ListThresholdMaps(FILE *file,const char*xml, % const char *filename,ExceptionInfo *exception) % % A description of each parameter follows. % % o file: An pointer to the output FILE. % % o xml: The threshold map list in XML format. % % o filename: The threshold map XML filename. % % o exception: return any errors or warnings in this structure. % */ MagickBooleanType ListThresholdMapFile(FILE *file,const char *xml, const char *filename,ExceptionInfo *exception) { const char *alias, *content, *map; XMLTreeInfo *description, *threshold, *thresholds; assert( xml != (char *)NULL ); assert( file != (FILE *)NULL ); (void) LogMagickEvent(ConfigureEvent,GetMagickModule(), "Loading threshold map file \"%s\" ...",filename); thresholds=NewXMLTree(xml,exception); if ( thresholds == (XMLTreeInfo *)NULL ) return(MagickFalse); (void) FormatLocaleFile(file,"%-16s %-12s %s\n","Map","Alias","Description"); (void) FormatLocaleFile(file, "----------------------------------------------------\n"); threshold=GetXMLTreeChild(thresholds,"threshold"); for ( ; threshold != (XMLTreeInfo *) NULL; threshold=GetNextXMLTreeTag(threshold)) { map=GetXMLTreeAttribute(threshold,"map"); if (map == (char *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingAttribute", ""); thresholds=DestroyXMLTree(thresholds); return(MagickFalse); } alias=GetXMLTreeAttribute(threshold,"alias"); description=GetXMLTreeChild(threshold,"description"); if (description == (XMLTreeInfo *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingElement", ", map \"%s\"",map); thresholds=DestroyXMLTree(thresholds); return(MagickFalse); } content=GetXMLTreeContent(description); if (content == (char *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "XmlMissingContent", ", map \"%s\"", map); thresholds=DestroyXMLTree(thresholds); return(MagickFalse); } (void) FormatLocaleFile(file,"%-16s %-12s %s\n",map,alias ? alias : "", content); } thresholds=DestroyXMLTree(thresholds); return(MagickTrue); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % L i s t T h r e s h o l d M a p s % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % ListThresholdMaps() lists the threshold maps and their descriptions % as defined by "threshold.xml" to a file. % % The format of the ListThresholdMaps method is: % % MagickBooleanType ListThresholdMaps(FILE *file,ExceptionInfo *exception) % % A description of each parameter follows. % % o file: An pointer to the output FILE. % % o exception: return any errors or warnings in this structure. % */ MagickExport MagickBooleanType ListThresholdMaps(FILE *file, ExceptionInfo *exception) { const StringInfo *option; LinkedListInfo *options; MagickStatusType status; status=MagickFalse; if (file == (FILE *) NULL) file=stdout; options=GetConfigureOptions(ThresholdsFilename,exception); (void) FormatLocaleFile(file, "\n Threshold Maps for Ordered Dither Operations\n"); while ((option=(const StringInfo *) GetNextValueInLinkedList(options)) != (const StringInfo *) NULL) { (void) FormatLocaleFile(file,"\nPATH: %s\n\n",GetStringInfoPath(option)); status|=ListThresholdMapFile(file,(const char *) GetStringInfoDatum(option), GetStringInfoPath(option),exception); } options=DestroyConfigureOptions(options); return(status != 0 ? MagickTrue : MagickFalse); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % O r d e r e d P o s t e r i z e I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % OrderedPosterizeImage() will perform a ordered dither based on a number % of pre-defined dithering threshold maps, but over multiple intensity % levels, which can be different for different channels, according to the % input argument. % % The format of the OrderedPosterizeImage method is: % % MagickBooleanType OrderedPosterizeImage(Image *image, % const char *threshold_map,ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o threshold_map: A string containing the name of the threshold dither % map to use, followed by zero or more numbers representing the number % of color levels tho dither between. % % Any level number less than 2 will be equivalent to 2, and means only % binary dithering will be applied to each color channel. % % No numbers also means a 2 level (bitmap) dither will be applied to all % channels, while a single number is the number of levels applied to each % channel in sequence. More numbers will be applied in turn to each of % the color channels. % % For example: "o3x3,6" will generate a 6 level posterization of the % image with a ordered 3x3 diffused pixel dither being applied between % each level. While checker,8,8,4 will produce a 332 colormaped image % with only a single checkerboard hash pattern (50% grey) between each % color level, to basically double the number of color levels with % a bare minimim of dithering. % % o exception: return any errors or warnings in this structure. % */ MagickExport MagickBooleanType OrderedPosterizeImage(Image *image, const char *threshold_map,ExceptionInfo *exception) { #define DitherImageTag "Dither/Image" CacheView *image_view; char token[MaxTextExtent]; const char *p; MagickBooleanType status; MagickOffsetType progress; MagickRealType levels[CompositePixelChannel]; register ssize_t i; ssize_t y; ThresholdMap *map; assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickSignature); if (threshold_map == (const char *) NULL) return(MagickTrue); p=(char *) threshold_map; while (((isspace((int) ((unsigned char) *p)) != 0) || (*p == ',')) && (*p != '\0')) p++; threshold_map=p; while (((isspace((int) ((unsigned char) *p)) == 0) && (*p != ',')) && (*p != '\0')) { if ((p-threshold_map) >= (MaxTextExtent-1)) break; token[p-threshold_map]=(*p); p++; } token[p-threshold_map]='\0'; map=GetThresholdMap(token,exception); if (map == (ThresholdMap *) NULL) { (void) ThrowMagickException(exception,GetMagickModule(),OptionError, "InvalidArgument","%s : '%s'","ordered-dither",threshold_map); return(MagickFalse); } for (i=0; i < MaxPixelChannels; i++) levels[i]=2.0; p=strchr((char *) threshold_map,','); if ((p != (char *) NULL) && (isdigit((int) ((unsigned char) *(++p))) != 0)) for (i=0; (*p != '\0') && (i < MaxPixelChannels); i++) { GetMagickToken(p,&p,token); if (*token == ',') GetMagickToken(p,&p,token); levels[i]=StringToDouble(token,(char **) NULL); } for (i=0; i < MaxPixelChannels; i++) if (fabs(levels[i]) >= 1) levels[i]-=1.0; if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse) return(MagickFalse); status=MagickTrue; progress=0; image_view=AcquireCacheView(image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,8) shared(progress,status) #endif for (y=0; y < (ssize_t) image->rows; y++) { register ssize_t x; register Quantum *restrict q; if (status == MagickFalse) continue; q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) { status=MagickFalse; continue; } for (x=0; x < (ssize_t) image->columns; x++) { register ssize_t i; ssize_t n; n=0; if (GetPixelMask(image,q) != 0) { q+=GetPixelChannels(image); continue; } for (i=0; i < (ssize_t) GetPixelChannels(image); i++) { PixelChannel channel; PixelTrait traits; ssize_t level, threshold; channel=GetPixelChannelMapChannel(image,i); traits=GetPixelChannelMapTraits(image,channel); if ((traits & UpdatePixelTrait) == 0) continue; if (fabs(levels[n++]) < MagickEpsilon) continue; threshold=(ssize_t) (QuantumScale*q[i]*(levels[n]*(map->divisor-1)+1)); level=threshold/(map->divisor-1); threshold-=level*(map->divisor-1); q[i]=RoundToQuantum((MagickRealType) (level+(threshold >= map->levels[(x % map->width)+map->width*(y % map->height)]))* QuantumRange/levels[n]); n++; } q+=GetPixelChannels(image); } if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_OrderedPosterizeImage) #endif proceed=SetImageProgress(image,DitherImageTag,progress++,image->rows); if (proceed == MagickFalse) status=MagickFalse; } } image_view=DestroyCacheView(image_view); map=DestroyThresholdMap(map); return(MagickTrue); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R a n d o m T h r e s h o l d I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % RandomThresholdImage() changes the value of individual pixels based on the % intensity of each pixel compared to a random threshold. The result is a % low-contrast, two color image. % % The format of the RandomThresholdImage method is: % % MagickBooleanType RandomThresholdImage(Image *image, % const char *thresholds,ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o thresholds: a geometry string containing low,high thresholds. If the % string contains 2x2, 3x3, or 4x4, an ordered dither of order 2, 3, or 4 % is performed instead. % % o exception: return any errors or warnings in this structure. % */ MagickExport MagickBooleanType RandomThresholdImage(Image *image, const char *thresholds,ExceptionInfo *exception) { #define ThresholdImageTag "Threshold/Image" CacheView *image_view; GeometryInfo geometry_info; MagickStatusType flags; MagickBooleanType concurrent, status; MagickOffsetType progress; PixelInfo threshold; MagickRealType min_threshold, max_threshold; RandomInfo **restrict random_info; ssize_t y; assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickSignature); if (thresholds == (const char *) NULL) return(MagickTrue); if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse) return(MagickFalse); GetPixelInfo(image,&threshold); min_threshold=0.0; max_threshold=(MagickRealType) QuantumRange; flags=ParseGeometry(thresholds,&geometry_info); min_threshold=geometry_info.rho; max_threshold=geometry_info.sigma; if ((flags & SigmaValue) == 0) max_threshold=min_threshold; if (strchr(thresholds,'%') != (char *) NULL) { max_threshold*=(MagickRealType) (0.01*QuantumRange); min_threshold*=(MagickRealType) (0.01*QuantumRange); } /* Random threshold image. */ status=MagickTrue; progress=0; random_info=AcquireRandomInfoThreadSet(); concurrent=GetRandomSecretKey(random_info[0]) == ~0UL ? MagickTrue : MagickFalse; image_view=AcquireCacheView(image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,8) shared(progress,status) omp_concurrent(concurrent) #endif for (y=0; y < (ssize_t) image->rows; y++) { const int id = GetOpenMPThreadId(); register Quantum *restrict q; register ssize_t x; if (status == MagickFalse) continue; q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) { status=MagickFalse; continue; } for (x=0; x < (ssize_t) image->columns; x++) { register ssize_t i; if (GetPixelMask(image,q) != 0) { q+=GetPixelChannels(image); continue; } for (i=0; i < (ssize_t) GetPixelChannels(image); i++) { MagickRealType threshold; PixelChannel channel; PixelTrait traits; channel=GetPixelChannelMapChannel(image,i); traits=GetPixelChannelMapTraits(image,channel); if ((traits & UpdatePixelTrait) == 0) continue; if ((MagickRealType) q[i] < min_threshold) threshold=min_threshold; else if ((MagickRealType) q[i] > max_threshold) threshold=max_threshold; else threshold=(MagickRealType) (QuantumRange* GetPseudoRandomValue(random_info[id])); q[i]=(Quantum) ((MagickRealType) q[i] <= threshold ? 0 : QuantumRange); } q+=GetPixelChannels(image); } if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_RandomThresholdImage) #endif proceed=SetImageProgress(image,ThresholdImageTag,progress++, image->rows); if (proceed == MagickFalse) status=MagickFalse; } } image_view=DestroyCacheView(image_view); random_info=DestroyRandomInfoThreadSet(random_info); return(status); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % W h i t e T h r e s h o l d I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % WhiteThresholdImage() is like ThresholdImage() but forces all pixels above % the threshold into white while leaving all pixels at or below the threshold % unchanged. % % The format of the WhiteThresholdImage method is: % % MagickBooleanType WhiteThresholdImage(Image *image, % const char *threshold,ExceptionInfo *exception) % % A description of each parameter follows: % % o image: the image. % % o threshold: Define the threshold value. % % o exception: return any errors or warnings in this structure. % */ MagickExport MagickBooleanType WhiteThresholdImage(Image *image, const char *thresholds,ExceptionInfo *exception) { #define ThresholdImageTag "Threshold/Image" #define WhiteThreshold(pixel,threshold_percentage) \ if (pixel > threshold_percentage) pixel=QuantumRange; CacheView *image_view; GeometryInfo geometry_info; MagickBooleanType status; MagickOffsetType progress; PixelInfo threshold_percentage; MagickStatusType flags; ssize_t y; assert(image != (Image *) NULL); assert(image->signature == MagickSignature); if (image->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); if (thresholds == (const char *) NULL) return(MagickTrue); if (SetImageStorageClass(image,DirectClass,exception) == MagickFalse) return(MagickFalse); if (IsGrayColorspace(image->colorspace) != MagickFalse) (void) TransformImageColorspace(image,sRGBColorspace,exception); GetPixelInfo(image,&threshold_percentage); flags=ParseGeometry(thresholds,&geometry_info); threshold_percentage.red=geometry_info.rho; threshold_percentage.green=geometry_info.rho; threshold_percentage.blue=geometry_info.rho; threshold_percentage.black=geometry_info.rho; threshold_percentage.alpha=100.0; if ((flags & SigmaValue) != 0) threshold_percentage.green=geometry_info.sigma; if ((flags & XiValue) != 0) threshold_percentage.blue=geometry_info.xi; if ((flags & PsiValue) != 0) threshold_percentage.alpha=geometry_info.psi; if (threshold_percentage.colorspace == CMYKColorspace) { if ((flags & PsiValue) != 0) threshold_percentage.black=geometry_info.psi; if ((flags & ChiValue) != 0) threshold_percentage.alpha=geometry_info.chi; } /* White threshold image. */ status=MagickTrue; progress=0; image_view=AcquireCacheView(image); #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp parallel for schedule(static,8) shared(progress,status) #endif for (y=0; y < (ssize_t) image->rows; y++) { PixelInfo pixel; register ssize_t x; register Quantum *restrict q; if (status == MagickFalse) continue; q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) { status=MagickFalse; continue; } GetPixelInfo(image,&pixel); for (x=0; x < (ssize_t) image->columns; x++) { if (GetPixelMask(image,q) != 0) { q+=GetPixelChannels(image); continue; } GetPixelInfoPixel(image,q,&pixel); WhiteThreshold(pixel.red,threshold_percentage.red); WhiteThreshold(pixel.green,threshold_percentage.green); WhiteThreshold(pixel.blue,threshold_percentage.blue); WhiteThreshold(pixel.black,threshold_percentage.black); WhiteThreshold(pixel.alpha,threshold_percentage.alpha); SetPixelInfoPixel(image,&pixel,q); q+=GetPixelChannels(image); } if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse) status=MagickFalse; if (image->progress_monitor != (MagickProgressMonitor) NULL) { MagickBooleanType proceed; #if defined(MAGICKCORE_OPENMP_SUPPORT) #pragma omp critical (MagickCore_WhiteThresholdImage) #endif proceed=SetImageProgress(image,ThresholdImageTag,progress++, image->rows); if (proceed == MagickFalse) status=MagickFalse; } } image_view=DestroyCacheView(image_view); return(status); }