MATLAB: Contrast adjustment/pixel adjustment

histogram refinementImage Processing Toolbox

Please I am still learning, I have a gray scale image with the intensity values ranges from 0 to 255. If I plot the histogram of the images, I was having some noises at both ends of the histogram. I like to refine the image pixels by ignoring the pixels that are below certain thresholds in order to have new minimum and maximum intensity values and of course to get rid of those noises at both ends. I also like to define my threshold as a function of the image size if possible. Can somebody please help me with the code? Thanks in advance.

Best Answer

See my salt and pepper noise removal demos, attached. Of course they can easily be adapted to get rid of noise above and below thresholds instead of just exactly at 0 and 255.

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MATLAB: How to show noise spectrum from a grayimage

First get the noise image alone. To get this you'll have to know/have the noise-free image. Then call fft2(). If you don't have a noise-free image, then the best you can do is to get the spectrum of the noise+(true image) together, rather than the noise alone.

MATLAB: How to calculate enhancement factor for an image

Image Enhancement Factor (IEF)=MSE(Original Image, Noise Image) / MSE (Original Image, Restored Image)

I hope you can easily implement in Matlab, for detail you can check this leterature

Or check here the matlab code

Or here it is, nore simply, you have three image, original_image, noisy_image and restored_image

MSE1=immse(original_image, noisy_image);
MSE2=immse(original_image, restored_image);
IEF=MSE1/MSE2;
fprintf('The Image Enhancement Factor is %.2f',IEF);

Best Answer

Related Solutions

MATLAB: How to show noise spectrum from a grayimage

MATLAB: How to calculate enhancement factor for an image

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