Extract data from a histogram
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I have a 256 x 256 pixel gray image. I drew the histogram of this image in matlab. I need to find the total number of pixels in each of the 0-64,64-128,128-192 and 192-255 gray levels. I've plotted the histogram but I can't get the pixel values. Is anyone you help?
采纳的回答
Try this:
grayImage = imread('cameraman.tif');
subplot(2, 1, 1);
imshow(grayImage, []);
subplot(2, 1, 2);
imhist(grayImage); % Display histogram
grid on;
edges = [0 : 64 : 255, 255]
[counts, edges] = histcounts(grayImage, edges)
2 个评论
elTurco
2023-4-7
Image Analyst
2023-4-7
编辑：Image Analyst
2023-4-7
For example, for one range:
mask = (grayImage >= 0) & (grayImage <= 64);
numPixelsInRange = nnz(mask)
stdDev = std(grayImage(mask))
theMean = mean(grayImage(mask))
更多回答（1 个）
dpb
2023-4-7
移动：Image Analyst
2023-4-7
0 个投票
Use histcounts as direct solution instead. The data are inside the histogram but you've got to go "handle diving" to retrieve them if you didn't save the object handle when called it; if you did then see the 'Properties' section of the doc for it (link to in the 'See Also') section. All in all, it's easier to just use histcounts
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