In both the contrast stretching and window/level algorithms, monotonic and linear (and in the case of window/level, piece-wise linear) gray-level transform functions are applied to an image whose processed histogram yields an image of enhanced quality. In this section we consider a non-linear transform that takes into account the morphology of the input histogram. Consider […]
Histogram Specification Histogram equalization is used as an intermediate step in a closely related and more useful spatial processing technique, histogram specification. As we have just seen, in histogram equalization a single output is generated – a transformed image with a flat, or uniform, probability distribution. In histogram specification, we generalize this algorithm so that […]