image equalization and cumulative histogram

Following code does equalization on input image and draw the cumulative histogram before and after .

Code:

   I = imread('cameraman.tif'); 
   %% Show current image.
   imshow(I);
   %% draw the cumulative  histogram of  orginal image.
   figure; 
   histogram = imhist(I);%image histogram.
   ch = cumsum(histogram);%cumulative  histogram.
   bar(ch,'BarWidth',1)%draw bar.
   %% image equalization and cumulative histogram 
   figure; 
   J = histeq(I);
   imshow(J);
   figure; 
   histogramEq = imhist(J);%image histogram.
   ch = cumsum(histogramEq);%cumulative  histogram.
   bar(ch,'BarWidth',1)%draw bar.
 

Attachments:

File comment: Before equalization

1.GIF [ 18.73 KiB | Viewed 11790 times ]

File comment: After equalization

2.GIF [ 21.7 KiB | Viewed 11790 times ]

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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