1. in Transform and Feature Extraction
Supplement Slides
in Transform and Feature Extraction

2. Calculation of an image histogram (New Slide – please note down)
Create an array histogram with 2b elements
for all grey levels, i, do
histogram[i] = 0
end for
for all pixel coordinates, x and y, do
Increment histogram [f(x,y)] by 1

3. Calculating histogram equalisation (New Slide – please note down)
Compute a scaling factor, a=255/number of pixels
Calculate histogram (see previous algorithm)
c[0] = a*histogram[0]
for all remaining grey levels, i, do
c[i] = c[i-1]+a*histogram[i]
end for
for all pixel coordinates, x and y, do
g(x,y) = c[f(x,y)]