How to apply Cumulative Density Function Formula?

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Mustafa Uysal 2019-10-30

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评论： Mustafa Uysal 2019-11-1

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Hi,

I am trying to implement a research paper using MATLAB. i have to to apply this three formula, respectively.

PDa = zeros(1,256);

for i=1:256
 PDa(i) = hCL(i) / (width*height); % width*height = total number of pixels
end
CDa = zeros(1,256);  %create CDa in formula
CDa(1) = PDa(1) ;
for i=2:256
     CDa(i) =  PDa(i) +  CDa(i-1);
end
value_after_enhancement =  zeros(1,256); 
for i=1:256
     value_after_enhancement(i) = 255 * CDa(i); 
end

But maximum value of CDa is 0.109. So, i see a dark image (maximum pixel value is 3) as a result. I couldn't understand where the problem is in my code. Can you help me, please?