How to retrieve data points from a grayscale histogram?

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Luis Fernandez 2021-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/854245-how-to-retrieve-data-points-from-a-grayscale-histogram

评论： Luis Fernandez 2021-6-14

Hello! I have a grayscale image and its histogram. How do can I extract data points from this histogram? Say, the number of pixels for each value of the grayscale; I need to put that information into excel.

Thank you.

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Answer 1

Image Analyst 2021-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/854245-how-to-retrieve-data-points-from-a-grayscale-histogram#answer_723260

在 MATLAB Online 中打开

Try this:

grayImage = imread('cameraman.tif'); % Read in image.
counts = imhist(grayImage) % Take histogram
grayLevels = 0 : (length(counts) - 1) % Construct gray level vector.
dataForExcel = [grayLevels(:), counts] % Stitch them together into one array.
writematrix(dataForExcel, 'data.xlsx'); % Write an  Excel workbook.