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Photonics Dictionary

image contrast

Also referred to as image visibility, the contrast of an image is the variation in the intensity of an image formed by an optical system, where the image pixels are defined on a gray scale scheme of black being the dimmest and white being the brightest intensity values. Image contrast is then quantified by the expression: (I_max –I_min) / (I_max + I_min), where I_max and I_min are the maximum and minimum points of intensity in the image.

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