MATLAB: I have an image (256 x 256) where its pixels ranging from 0 to 255. I need to built a look up table to map its values with image pixels.

image processingImage Processing Toolboxlook up tablemapping

Since I am a beginner, I cant find a way as how to start with coding for lookuptable. It would really helpful if you would help.

Best Answer

Use intlut(). Create your lookuptable, lut, then pass that plus your image into intlut() to get a new, transformed image.

Related Solutions

MATLAB: Convert the intensity of image into a specific intensity range

You can use mat2gray:

Img2 = uint8(255 * mat2gray(Img));

or you can use rescale

Img2 = rescale(Img, 0, 255);

rescale gives a floating point output. Cast to uint8 if you want uint8. Pick whatever min and max you want. We can give a better answer if you tell us why the code you used did not give the expected answer.

MATLAB: Efficient way to set specific range of pixels to zero.

You could use intlut(). Something like

lut = gray(256);
% Make gray levels 91 through 99 be 0
lut(92:100) ;
new_gray = intlut(grayImage, lut);

DON'T name your image gray. That is the name of a built-in function that creates a colormap.

Best Answer

Related Solutions

MATLAB: Convert the intensity of image into a specific intensity range

MATLAB: Efficient way to set specific range of pixels to zero.

Related Question