Description: ADJCONTRAST- Adjusts image contrast using sigmoid function.
function g = adjcontrast(im, gain, cutoff)
Arguments:
im - image to be processed.
gain - controls the actual contrast
A value of about 5 is neutral (little change).
A value of 1 reduces contrast to about 20 of original
A value of 10 increases contrast about 2.5x.
a reasonable range of values to experiment with.
cutoff- represents the (normalised) grey value about which
contrast is increased or decreased. An initial
value you might use is 0.5 (the midpoint of the
greyscale) but different images may require
different points of the greyscale to be enhanced.
Peter Kovesi
School of Computer Science & Software Engineering
The University of Western Australia
pk @ csse uwa edu
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adjcontrast.m
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