MATLAB: Grey Level Histogram of IMAGE

image histogram

Can any one tell me how to calculate the grey level histogram of image without using direct function in matlab imhist?

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Loop over every pixel. For each pixel, get the gray level. The gray level is an index to your "counts" array. Increment that element by one. Details are left up to you.

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MATLAB: Imhist() is not generating histogram image of image

imhist(), as you called it, will display the histogram only. It will not return the histogram bin values. However, you immediately cover it up with the image so that the histogram can no longer be shown. Try this:

baseFileName = 'violet.bmp';
fullFileName = fullfile(pwd, baseFileName);
if exist(fullFileName)
  rgbImage = imread(fullFileName);
  grayImage= rgb2gray(rgbImage);
  [pixelCounts grayLevels] = imhist(grayImage, 256);
  bar(grayLevels, pixelCounts);
  xlim([0 255]);
  uiwait(msgbox('Click OK to see the image'));
  imshow(grayImage);
else
  warningMessage = sprintf('Error: file not found\n%s', fullFileName);
  uiwait(warndlg(warningMessage));
end

MATLAB: How to show lab space image

What about conversion to RGB before displaying.

imshow(lab2rgb(image));

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MATLAB: Imhist() is not generating histogram image of image

MATLAB: How to show lab space image

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