Description: each of the matrix elements known as a pixel, pixels or image elements. And g (i, j), speaking on behalf of (i, j) of the gray values, brightness value. As g (i, j) on behalf of the image point of light intensity (brightness), but just a form of energy, the g (i, j) must be greater than zero, and has limited value, namely : 0 "= g (i, j)" 2n. By g (i, j) to indicate the numerical (i, j) position on the point value of the gray-class size, that is, only reflects the intensity of black and white relations. Digital sampling is usually square lattice sampling,
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