CONTRAST STRETCHING It is also called as normalization. The simple
image enhancement technique that improves the contrast in an image by
“stretching” the range of intensity values that it contains to span a desired
range of values is contrast stretching.
NOISE FILTERING When we want to remove the unwanted information or
things from an image then this technique is used. This technique is also used
to remove different types of noises from an image. This technique is
interactive. Low pass, high pass, mean, median etc different filters are
available.
Histogram equalization It is a nonlinear stretch that redistributes pixel values
so that there is approximately the same number of pixels with each value within
a range. The result approximates a flat histogram. Therefore, contrast is
increased at the peaks and lessened at the tails.
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