imhist() is not generating histogram image of image

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Sat m 2013-2-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/64305-imhist-is-not-generating-histogram-image-of-image

评论： Zahra Saman 2018-4-12

i have an RGB image and i am trying to generate histogram from the intensity image of the RGB. but my code is not generating histogram. please let me know how to solve

Pic = 'violet.bmp';
s1 = imread(Pic);
I1 = rgb2gray(s1);
imhist(I1);
imshow(I1);
drawnow();

this code only generatig till rgb2gray(), it is not generating imhist() part.

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Answer 1

Image Analyst 2013-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/64305-imhist-is-not-generating-histogram-image-of-image#answer_75893

在 MATLAB Online 中打开

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