]> granicus.if.org Git - imagemagick/blobdiff - MagickCore/compare.c
(no commit message)
[imagemagick] / MagickCore / compare.c
index 0e21c7672a4e6a64a57c9bcb920e1292cfb6d285..f255bfeeb7099c820af4185428648268087dfa7a 100644 (file)
@@ -17,7 +17,7 @@
 %                               December 2003                                 %
 %                                                                             %
 %                                                                             %
-%  Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization      %
+%  Copyright 1999-2013 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  %
@@ -64,6 +64,7 @@
 #include "MagickCore/resource_.h"
 #include "MagickCore/string_.h"
 #include "MagickCore/statistic.h"
+#include "MagickCore/thread-private.h"
 #include "MagickCore/transform.h"
 #include "MagickCore/utility.h"
 #include "MagickCore/version.h"
@@ -79,7 +80,7 @@
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
-%  CompareImages() compares one or more pixel channels of an image to a 
+%  CompareImages() compares one or more pixel channels of an image to a
 %  reconstructed image and returns the difference image.
 %
 %  The format of the CompareImages method is:
@@ -161,14 +162,11 @@ MagickExport Image *CompareImages(Image *image,const Image *reconstruct_image,
       return((Image *) NULL);
     }
   (void) SetImageAlphaChannel(highlight_image,OpaqueAlphaChannel,exception);
-  (void) QueryColorCompliance("#f1001ecc",AllCompliance,&highlight,
-    exception);
+  (void) QueryColorCompliance("#f1001e33",AllCompliance,&highlight,exception);
   artifact=GetImageArtifact(image,"highlight-color");
   if (artifact != (const char *) NULL)
-    (void) QueryColorCompliance(artifact,AllCompliance,&highlight,
-      exception);
-  (void) QueryColorCompliance("#ffffffcc",AllCompliance,&lowlight,
-    exception);
+    (void) QueryColorCompliance(artifact,AllCompliance,&highlight,exception);
+  (void) QueryColorCompliance("#ffffff33",AllCompliance,&lowlight,exception);
   artifact=GetImageArtifact(image,"lowlight-color");
   if (artifact != (const char *) NULL)
     (void) QueryColorCompliance(artifact,AllCompliance,&lowlight,exception);
@@ -176,11 +174,12 @@ MagickExport Image *CompareImages(Image *image,const Image *reconstruct_image,
     Generate difference image.
   */
   status=MagickTrue;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
-  highlight_view=AcquireCacheView(highlight_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
+  highlight_view=AcquireAuthenticCacheView(highlight_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(status)
+  #pragma omp parallel for schedule(static,4) shared(status) \
+    magick_threads(image,highlight_image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -218,10 +217,18 @@ MagickExport Image *CompareImages(Image *image,const Image *reconstruct_image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          SetPixelInfoPixel(highlight_image,&lowlight,r);
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          r+=GetPixelChannels(highlight_image);
+          continue;
+        }
       difference=MagickFalse;
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -231,23 +238,21 @@ MagickExport Image *CompareImages(Image *image,const Image *reconstruct_image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
-          continue;
-        distance=p[i]-(MagickRealType)
-          GetPixelChannel(reconstruct_image,channel,q);
+        distance=p[i]-(double) GetPixelChannel(reconstruct_image,channel,q);
         if (fabs((double) distance) >= MagickEpsilon)
           difference=MagickTrue;
       }
       if (difference == MagickFalse)
-        SetPixelPixelInfo(highlight_image,&lowlight,r);
+        SetPixelInfoPixel(highlight_image,&lowlight,r);
       else
-        SetPixelPixelInfo(highlight_image,&highlight,r);
+        SetPixelInfoPixel(highlight_image,&highlight,r);
       p+=GetPixelChannels(image);
       q+=GetPixelChannels(reconstruct_image);
       r+=GetPixelChannels(highlight_image);
@@ -259,8 +264,8 @@ MagickExport Image *CompareImages(Image *image,const Image *reconstruct_image,
   highlight_view=DestroyCacheView(highlight_view);
   reconstruct_view=DestroyCacheView(reconstruct_view);
   image_view=DestroyCacheView(image_view);
-  (void) CompositeImage(difference_image,image->compose,highlight_image,0,0,
-    exception);
+  (void) CompositeImage(difference_image,highlight_image,image->compose,
+    MagickTrue,0,0,exception);
   highlight_image=DestroyImage(highlight_image);
   if (status == MagickFalse)
     difference_image=DestroyImage(difference_image);
@@ -278,10 +283,10 @@ MagickExport Image *CompareImages(Image *image,const Image *reconstruct_image,
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
-%  GetImageDistortion() compares one or more pixel channels of an image to a 
+%  GetImageDistortion() compares one or more pixel channels of an image to a
 %  reconstructed image and returns the specified distortion metric.
 %
-%  The format of the CompareImages method is:
+%  The format of the GetImageDistortion method is:
 %
 %      MagickBooleanType GetImageDistortion(const Image *image,
 %        const Image *reconstruct_image,const MetricType metric,
@@ -318,10 +323,11 @@ static MagickBooleanType GetAbsoluteDistortion(const Image *image,
     Compute the absolute difference in pixels between two images.
   */
   status=MagickTrue;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(status)
+  #pragma omp parallel for schedule(static,4) shared(status) \
+    magick_threads(image,image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -355,6 +361,12 @@ static MagickBooleanType GetAbsoluteDistortion(const Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       difference=MagickFalse;
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
@@ -365,13 +377,12 @@ static MagickBooleanType GetAbsoluteDistortion(const Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
-          continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
         if (p[i] != GetPixelChannel(reconstruct_image,channel,q))
           difference=MagickTrue;
@@ -379,13 +390,13 @@ static MagickBooleanType GetAbsoluteDistortion(const Image *image,
       if (difference != MagickFalse)
         {
           channel_distortion[i]++;
-          channel_distortion[MaxPixelChannels]++;
+          channel_distortion[CompositePixelChannel]++;
         }
       p+=GetPixelChannels(image);
       q+=GetPixelChannels(reconstruct_image);
     }
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_GetAbsoluteError)
+    #pragma omp critical (MagickCore_GetAbsoluteError)
 #endif
     for (i=0; i <= MaxPixelChannels; i++)
       distortion[i]+=channel_distortion[i];
@@ -406,10 +417,14 @@ static size_t GetImageChannels(const Image *image)
   channels=0;
   for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
   {
+    PixelChannel
+      channel;
+
     PixelTrait
       traits;
 
-    traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
+    channel=GetPixelChannelChannel(image,i);
+    traits=GetPixelChannelTraits(image,channel);
     if ((traits & UpdatePixelTrait) != 0)
       channels++;
   }
@@ -433,10 +448,11 @@ static MagickBooleanType GetFuzzDistortion(const Image *image,
     y;
 
   status=MagickTrue;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(status)
+  #pragma omp parallel for schedule(static,4) shared(status) \
+    magick_threads(image,image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -467,9 +483,15 @@ static MagickBooleanType GetFuzzDistortion(const Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -479,25 +501,24 @@ static MagickBooleanType GetFuzzDistortion(const Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
-          continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
-        distance=QuantumScale*(p[i]-(MagickRealType) GetPixelChannel(
-          reconstruct_image,channel,q));
+        distance=QuantumScale*(p[i]-(double) GetPixelChannel(reconstruct_image,
+          channel,q));
         distance*=distance;
         channel_distortion[i]+=distance;
-        channel_distortion[MaxPixelChannels]+=distance;
+        channel_distortion[CompositePixelChannel]+=distance;
       }
       p+=GetPixelChannels(image);
       q+=GetPixelChannels(reconstruct_image);
     }
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_GetMeanSquaredError)
+    #pragma omp critical (MagickCore_GetFuzzDistortion)
 #endif
     for (i=0; i <= MaxPixelChannels; i++)
       distortion[i]+=channel_distortion[i];
@@ -506,8 +527,8 @@ static MagickBooleanType GetFuzzDistortion(const Image *image,
   image_view=DestroyCacheView(image_view);
   for (i=0; i <= MaxPixelChannels; i++)
     distortion[i]/=((double) image->columns*image->rows);
-  distortion[MaxPixelChannels]/=(double) GetImageChannels(image);
-  distortion[MaxPixelChannels]=sqrt(distortion[MaxPixelChannels]);
+  distortion[CompositePixelChannel]/=(double) GetImageChannels(image);
+  distortion[CompositePixelChannel]=sqrt(distortion[CompositePixelChannel]);
   return(status);
 }
 
@@ -528,10 +549,11 @@ static MagickBooleanType GetMeanAbsoluteDistortion(const Image *image,
     y;
 
   status=MagickTrue;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(status)
+  #pragma omp parallel for schedule(static,4) shared(status) \
+    magick_threads(image,image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -562,9 +584,15 @@ static MagickBooleanType GetMeanAbsoluteDistortion(const Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -574,24 +602,23 @@ static MagickBooleanType GetMeanAbsoluteDistortion(const Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
-          continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
-        distance=QuantumScale*fabs(p[i]-(MagickRealType) GetPixelChannel(
+        distance=QuantumScale*fabs(p[i]-(double) GetPixelChannel(
           reconstruct_image,channel,q));
         channel_distortion[i]+=distance;
-        channel_distortion[MaxPixelChannels]+=distance;
+        channel_distortion[CompositePixelChannel]+=distance;
       }
       p+=GetPixelChannels(image);
       q+=GetPixelChannels(reconstruct_image);
     }
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_GetMeanAbsoluteError)
+    #pragma omp critical (MagickCore_GetMeanAbsoluteError)
 #endif
     for (i=0; i <= MaxPixelChannels; i++)
       distortion[i]+=channel_distortion[i];
@@ -600,7 +627,7 @@ static MagickBooleanType GetMeanAbsoluteDistortion(const Image *image,
   image_view=DestroyCacheView(image_view);
   for (i=0; i <= MaxPixelChannels; i++)
     distortion[i]/=((double) image->columns*image->rows);
-  distortion[MaxPixelChannels]/=(double) GetImageChannels(image);
+  distortion[CompositePixelChannel]/=(double) GetImageChannels(image);
   return(status);
 }
 
@@ -614,7 +641,7 @@ static MagickBooleanType GetMeanErrorPerPixel(Image *image,
   MagickBooleanType
     status;
 
-  MagickRealType
+  double
     alpha,
     area,
     beta,
@@ -630,8 +657,8 @@ static MagickBooleanType GetMeanErrorPerPixel(Image *image,
   area=0.0;
   maximum_error=0.0;
   mean_error=0.0;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
   for (y=0; y < (ssize_t) image->rows; y++)
   {
     register const Quantum
@@ -654,9 +681,15 @@ static MagickBooleanType GetMeanErrorPerPixel(Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -666,18 +699,17 @@ static MagickBooleanType GetMeanErrorPerPixel(Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
-          continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
         distance=fabs((double) (alpha*p[i]-beta*GetPixelChannel(
           reconstruct_image,channel,q)));
         distortion[i]+=distance;
-        distortion[MaxPixelChannels]+=distance;
+        distortion[CompositePixelChannel]+=distance;
         mean_error+=distance*distance;
         if (distance > maximum_error)
           maximum_error=distance;
@@ -689,7 +721,7 @@ static MagickBooleanType GetMeanErrorPerPixel(Image *image,
   }
   reconstruct_view=DestroyCacheView(reconstruct_view);
   image_view=DestroyCacheView(image_view);
-  image->error.mean_error_per_pixel=distortion[MaxPixelChannels]/area;
+  image->error.mean_error_per_pixel=distortion[CompositePixelChannel]/area;
   image->error.normalized_mean_error=QuantumScale*QuantumScale*mean_error/area;
   image->error.normalized_maximum_error=QuantumScale*maximum_error;
   return(status);
@@ -712,10 +744,11 @@ static MagickBooleanType GetMeanSquaredDistortion(const Image *image,
     y;
 
   status=MagickTrue;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(status)
+  #pragma omp parallel for schedule(static,4) shared(status) \
+    magick_threads(image,image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -746,9 +779,15 @@ static MagickBooleanType GetMeanSquaredDistortion(const Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -758,25 +797,24 @@ static MagickBooleanType GetMeanSquaredDistortion(const Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
-          continue;
-        distance=QuantumScale*(p[i]-(MagickRealType) GetPixelChannel(
+        distance=QuantumScale*(p[i]-(double) GetPixelChannel(
           reconstruct_image,channel,q));
         distance*=distance;
         channel_distortion[i]+=distance;
-        channel_distortion[MaxPixelChannels]+=distance;
+        channel_distortion[CompositePixelChannel]+=distance;
       }
       p+=GetPixelChannels(image);
       q+=GetPixelChannels(reconstruct_image);
     }
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_GetMeanSquaredError)
+    #pragma omp critical (MagickCore_GetMeanSquaredError)
 #endif
     for (i=0; i <= MaxPixelChannels; i++)
       distortion[i]+=channel_distortion[i];
@@ -785,7 +823,7 @@ static MagickBooleanType GetMeanSquaredDistortion(const Image *image,
   image_view=DestroyCacheView(image_view);
   for (i=0; i <= MaxPixelChannels; i++)
     distortion[i]/=((double) image->columns*image->rows);
-  distortion[MaxPixelChannels]/=GetImageChannels(image);
+  distortion[CompositePixelChannel]/=GetImageChannels(image);
   return(status);
 }
 
@@ -809,7 +847,7 @@ static MagickBooleanType GetNormalizedCrossCorrelationDistortion(
   MagickOffsetType
     progress;
 
-  MagickRealType
+  double
     area;
 
   register ssize_t
@@ -827,9 +865,9 @@ static MagickBooleanType GetNormalizedCrossCorrelationDistortion(
   progress=0;
   for (i=0; i <= MaxPixelChannels; i++)
     distortion[i]=0.0;
-  area=1.0/((MagickRealType) image->columns*image->rows-1);
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  area=1.0/((double) image->columns*image->rows-1);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
   for (y=0; y < (ssize_t) image->rows; y++)
   {
     register const Quantum
@@ -854,6 +892,12 @@ static MagickBooleanType GetNormalizedCrossCorrelationDistortion(
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
         PixelChannel
@@ -863,20 +907,19 @@ static MagickBooleanType GetNormalizedCrossCorrelationDistortion(
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
-          continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
         distortion[i]+=area*QuantumScale*(p[i]-image_statistics[i].mean)*
           (GetPixelChannel(reconstruct_image,channel,q)-
           reconstruct_statistics[channel].mean);
       }
       p+=GetPixelChannels(image);
-      q+=GetPixelChannels(image);
+      q+=GetPixelChannels(reconstruct_image);
     }
     if (image->progress_monitor != (MagickProgressMonitor) NULL)
       {
@@ -894,23 +937,23 @@ static MagickBooleanType GetNormalizedCrossCorrelationDistortion(
   /*
     Divide by the standard deviation.
   */
-  distortion[MaxPixelChannels]=0.0;
+  distortion[CompositePixelChannel]=0.0;
   for (i=0; i < MaxPixelChannels; i++)
   {
-    MagickRealType
+    double
       gamma;
 
     PixelChannel
       channel;
 
-    channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
+    channel=GetPixelChannelChannel(image,i);
     gamma=image_statistics[i].standard_deviation*
       reconstruct_statistics[channel].standard_deviation;
-    gamma=1.0/(fabs((double) gamma) <= MagickEpsilon ? 1.0 : gamma);
+    gamma=PerceptibleReciprocal(gamma);
     distortion[i]=QuantumRange*gamma*distortion[i];
-    distortion[MaxPixelChannels]+=distortion[i]*distortion[i];
+    distortion[CompositePixelChannel]+=distortion[i]*distortion[i];
   }
-  distortion[MaxPixelChannels]=sqrt(distortion[MaxPixelChannels]/
+  distortion[CompositePixelChannel]=sqrt(distortion[CompositePixelChannel]/
     GetImageChannels(image));
   /*
     Free resources.
@@ -936,10 +979,11 @@ static MagickBooleanType GetPeakAbsoluteDistortion(const Image *image,
     y;
 
   status=MagickTrue;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(status)
+  #pragma omp parallel for schedule(static,4) shared(status) \
+    magick_threads(image,image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -957,8 +1001,8 @@ static MagickBooleanType GetPeakAbsoluteDistortion(const Image *image,
     if (status == MagickFalse)
       continue;
     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
-    q=GetCacheViewVirtualPixels(reconstruct_view,0,y,
-      reconstruct_image->columns,1,exception);
+    q=GetCacheViewVirtualPixels(reconstruct_view,0,y,reconstruct_image->columns,
+      1,exception);
     if ((p == (const Quantum *) NULL) || (q == (const Quantum *) NULL))
       {
         status=MagickFalse;
@@ -970,9 +1014,15 @@ static MagickBooleanType GetPeakAbsoluteDistortion(const Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -982,26 +1032,25 @@ static MagickBooleanType GetPeakAbsoluteDistortion(const Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
-          continue;
-        distance=QuantumScale*fabs(p[i]-(MagickRealType) GetPixelChannel(
+        distance=QuantumScale*fabs(p[i]-(double) GetPixelChannel(
           reconstruct_image,channel,q));
         if (distance > channel_distortion[i])
           channel_distortion[i]=distance;
-        if (distance > channel_distortion[MaxPixelChannels])
-          channel_distortion[MaxPixelChannels]=distance;
+        if (distance > channel_distortion[CompositePixelChannel])
+          channel_distortion[CompositePixelChannel]=distance;
       }
       p+=GetPixelChannels(image);
-      q+=GetPixelChannels(image);
+      q+=GetPixelChannels(reconstruct_image);
     }
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_GetPeakAbsoluteError)
+    #pragma omp critical (MagickCore_GetPeakAbsoluteError)
 #endif
     for (i=0; i <= MaxPixelChannels; i++)
       if (channel_distortion[i] > distortion[i])
@@ -1136,7 +1185,7 @@ MagickExport MagickBooleanType GetImageDistortion(Image *image,
       break;
     }
   }
-  *distortion=channel_distortion[MaxPixelChannels];
+  *distortion=channel_distortion[CompositePixelChannel];
   channel_distortion=(double *) RelinquishMagickMemory(channel_distortion);
   return(status);
 }
@@ -1152,11 +1201,11 @@ MagickExport MagickBooleanType GetImageDistortion(Image *image,
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
-%  GetImageDistrortion() compares the pixel channels of an image to a
+%  GetImageDistortions() compares the pixel channels of an image to a
 %  reconstructed image and returns the specified distortion metric for each
 %  channel.
 %
-%  The format of the CompareImages method is:
+%  The format of the GetImageDistortions method is:
 %
 %      double *GetImageDistortions(const Image *image,
 %        const Image *reconstruct_image,const MetricType metric,
@@ -1337,7 +1386,7 @@ MagickExport MagickBooleanType IsImagesEqual(Image *image,
   MagickBooleanType
     status;
 
-  MagickRealType
+  double
     area,
     maximum_error,
     mean_error,
@@ -1357,8 +1406,8 @@ MagickExport MagickBooleanType IsImagesEqual(Image *image,
   maximum_error=0.0;
   mean_error_per_pixel=0.0;
   mean_error=0.0;
-  image_view=AcquireCacheView(image);
-  reconstruct_view=AcquireCacheView(reconstruct_image);
+  image_view=AcquireVirtualCacheView(image,exception);
+  reconstruct_view=AcquireVirtualCacheView(reconstruct_image,exception);
   for (y=0; y < (ssize_t) image->rows; y++)
   {
     register const Quantum
@@ -1378,9 +1427,15 @@ MagickExport MagickBooleanType IsImagesEqual(Image *image,
       register ssize_t
         i;
 
+      if (GetPixelMask(image,p) != 0)
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
       {
-        MagickRealType
+        double
           distance;
 
         PixelChannel
@@ -1390,15 +1445,14 @@ MagickExport MagickBooleanType IsImagesEqual(Image *image,
           reconstruct_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        reconstruct_traits=GetPixelChannelMapTraits(reconstruct_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        reconstruct_traits=GetPixelChannelTraits(reconstruct_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (reconstruct_traits == UndefinedPixelTrait))
-          continue;
-        if ((reconstruct_traits & UpdatePixelTrait) == 0)
+            (reconstruct_traits == UndefinedPixelTrait) ||
+            ((reconstruct_traits & UpdatePixelTrait) == 0))
           continue;
-        distance=fabs(p[i]-(MagickRealType) GetPixelChannel(reconstruct_image,
+        distance=fabs(p[i]-(double) GetPixelChannel(reconstruct_image,
           channel,q));
         mean_error_per_pixel+=distance;
         mean_error+=distance*distance;
@@ -1536,9 +1590,10 @@ MagickExport Image *SimilarityImage(Image *image,const Image *reference,
   */
   status=MagickTrue;
   progress=0;
-  similarity_view=AcquireCacheView(similarity_image);
+  similarity_view=AcquireAuthenticCacheView(similarity_image,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(dynamic,4) shared(progress,status)
+  #pragma omp parallel for schedule(static,4) shared(progress,status) \
+    magick_threads(image,image,image->rows,1)
 #endif
   for (y=0; y < (ssize_t) (image->rows-reference->rows+1); y++)
   {
@@ -1567,7 +1622,7 @@ MagickExport Image *SimilarityImage(Image *image,const Image *reference,
 
       similarity=GetSimilarityMetric(image,reference,metric,x,y,exception);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_SimilarityImage)
+      #pragma omp critical (MagickCore_SimilarityImage)
 #endif
       if (similarity < *similarity_metric)
         {
@@ -1575,7 +1630,12 @@ MagickExport Image *SimilarityImage(Image *image,const Image *reference,
           offset->x=x;
           offset->y=y;
         }
-      for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
+      if (GetPixelMask(similarity_image,q) != 0)
+        {
+          q+=GetPixelChannels(similarity_image);
+          continue;
+        }
+      for (i=0; i < (ssize_t) GetPixelChannels(similarity_image); i++)
       {
         PixelChannel
           channel;
@@ -1584,35 +1644,32 @@ MagickExport Image *SimilarityImage(Image *image,const Image *reference,
           similarity_traits,
           traits;
 
-        traits=GetPixelChannelMapTraits(image,(PixelChannel) i);
-        channel=GetPixelChannelMapChannel(image,(PixelChannel) i);
-        similarity_traits=GetPixelChannelMapTraits(similarity_image,channel);
+        channel=GetPixelChannelChannel(image,i);
+        traits=GetPixelChannelTraits(image,channel);
+        similarity_traits=GetPixelChannelTraits(similarity_image,channel);
         if ((traits == UndefinedPixelTrait) ||
-            (similarity_traits == UndefinedPixelTrait))
-          continue;
-        if ((similarity_traits & UpdatePixelTrait) == 0)
+            (similarity_traits == UndefinedPixelTrait) ||
+            ((similarity_traits & UpdatePixelTrait) == 0))
           continue;
         SetPixelChannel(similarity_image,channel,ClampToQuantum(QuantumRange-
           QuantumRange*similarity),q);
       }
       q+=GetPixelChannels(similarity_image);
     }
-    if (SyncCacheViewAuthenticPixels(similarity_view,exception) == MagickFalse)
+    if (IfMagickFalse( SyncCacheViewAuthenticPixels(similarity_view,exception) ))
       status=MagickFalse;
     if (image->progress_monitor != (MagickProgressMonitor) NULL)
       {
-        MagickBooleanType
-          proceed;
-
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp critical (MagickCore_SimilarityImage)
+        #pragma omp critical (MagickCore_SimilarityImage)
 #endif
-        proceed=SetImageProgress(image,SimilarityImageTag,progress++,
-          image->rows);
-        if (proceed == MagickFalse)
+        if (IfMagickFalse(SetImageProgress(image,SimilarityImageTag,
+                 progress++,image->rows) ))
           status=MagickFalse;
       }
   }
   similarity_view=DestroyCacheView(similarity_view);
+  if (status == MagickFalse)
+    similarity_image=DestroyImage(similarity_image);
   return(similarity_image);
 }