MATLAB: 1-) Determine & output pixel intensity values which needs improvements.? 2-) Apply linear constrast strecthing to pixel values determined in Question1

contrast enhancementsImage Processing Toolboxstretching

Please Help me

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Like I already suggested, try imadjust(). You could also try histeq() but that doesn't give very good looking images. Or you could use adapthisteq() which adapts the contrast to the local regions.

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You can use imadjust() in the Image Processing Toolbox. It's not interactive though. Or simply multiply your image by a factor between 0 and 1.

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You are probably looking for the imadjust command. As you can see in the documentation the basic syntax for imadjust is

OutputImage = imadjust(InputImage,[low_in; high_in],[low_out; high_out])

where low_in,high_in,low_out and high_out are between 0 and 1. Hence you could assign predetermined values to those and run imadjust on your images. There also a gamma parameter which you can add in you call to imadjust. This factor is used to enhance in a non-linear fashion low or high intensity signals. More info here

If you have the Image Processing Toolbox take a look at the Image Viewer App

Hope that helps get you started!

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MATLAB: Reducing an image contrast using matlab

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