Plotting histogram of image data present in a stack
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Hi All,
I have looked at the examples shown here to underetand how to plot histogram of a single image data. But
it's not clear to me how the data in a stack can be plotted.
For exmaple, I tried
f = "Test_Image.tiff";
img_data = imfinfo(f);
imhist(img_data)
test_image stack.
This returns
double, uint8, int8, logical, uint16, int16, single, uint32, int32
Instead its type was struct.
Any suggestions?
采纳的回答
Ameer Hamza
2020-10-14
iminfo just read the metadata of the image. Use imread() to read the image as matrix
f = "Test_Image.tiff";
img_data = imread(f);
imhist(img_data)
If it is an rgb image, then first convert it to grayscale too
f = "Test_Image.tiff";
img_data = rgb2gray(imread(f));
imhist(img_data)
6 个评论
Deepa Maheshvare
2020-10-14
编辑：Deepa Maheshvare
2020-10-14
Ameer Hamza
2020-10-14
Yes, you can use
img_data = imread(f, 'all');
to read all frames. But then how to you want to do imhist()? Do you want to plot histogram of each image individually.
Deepa Maheshvare
2020-10-14
编辑：Deepa Maheshvare
2020-10-14
Ameer Hamza
2020-10-14
Try this
f = "Test_Image.tiff";
img_data = imfinfo(f);
imgs = cell(1, numel(img_data));
for i = 1:numel(img_data)
imgs{i} = imread(f, i);
end
imgs = cat(3, imgs{:});
imhist(imgs(:))
Deepa Maheshvare
2020-10-14
Ameer Hamza
2020-10-14
By default imhist() uses 256 bins. You can get the counts using output of imhist()
[binCount, binLoc] = imhist(imgs(:));
To get min and max values
mean(imgs(:))
min(imgs(:))
max(imgs(:))
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