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% ContrastStretchImage() is a simple image enhancement technique that attempts
-% to improve the contrast in an image by `stretching' the range of intensity
+% to improve the contrast in an image by 'stretching' the range of intensity
% values it contains to span a desired range of values. It differs from the
% more sophisticated histogram equalization in that it can only apply a
% linear scaling function to the image pixel values. As a result the
-% `enhancement' is less harsh.
+% 'enhancement' is less harsh.
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% The format of the ContrastStretchImage method is:
%