Compare between histogram specification and constract stretch ing
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Contrast Stretching. Background: Contrast stretching (also called Normalization) attempts to improve an image by stretching the range of intensity values it contains to make full use of possible values. Unlike histogram equalization, contrast stretching is restricted to a linear mapping of input to output values.
In image processing, histogram matching or histogram specification is the transformation of an image so that its histogram matches a specified histogram.[1] The well-known histogram equalization method is a special case in which the specified histogram is uniformly distributed.[2]
It is possible to use histogram matching to balance detector responses as a relative detector calibration technique. It can be used to normalize two images, when the images were acquired at the same local illumination (such as shadows) over the same location, but by different sensors, atmospheric conditions or global illumination
In image processing, histogram matching or histogram specification is the transformation of an image so that its histogram matches a specified histogram.[1] The well-known histogram equalization method is a special case in which the specified histogram is uniformly distributed.[2]
It is possible to use histogram matching to balance detector responses as a relative detector calibration technique. It can be used to normalize two images, when the images were acquired at the same local illumination (such as shadows) over the same location, but by different sensors, atmospheric conditions or global illumination
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