How to retrieve data points from a grayscale histogram?
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Luis Fernandez
on 12 Jun 2021
Commented: Luis Fernandez
on 14 Jun 2021
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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Accepted Answer
Image Analyst
on 12 Jun 2021
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.
More Answers (1)
Sulaymon Eshkabilov
on 12 Jun 2021
(1) Import// read your image in matlab
(2) perform histogram analysis with hostogram(), e.g: h= histogram() or h = histogram2()
See this doc: https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.histogram2.html
(3) Collect necessary data from h that would be a structure array containing all data.
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