PIXEL counting at grey scaled picture

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DIMITRIOS ZAFEIRIOU
评论： DIMITRIOS ZAFEIRIOU 2022-1-24
I have a picture which is greyscaled and i want to count the number of pixels from 200-255( the bright ones) from the histogram.Any ideas about the coding or other way? Thank you!

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KALYAN ACHARJYA
KALYAN ACHARJYA 2022-1-24
编辑：KALYAN ACHARJYA 2022-1-24
%Using Histogram (Considering 256 Levels)
[counts,binLocations]=imhist(grayImage);
pix_counts=sum(counts(200:end))
##
%% 2nd Method, easier
high_pix=grayImage>199;
pix_counts=sum(high_pix(:))

更多回答（1 个）

Image Analyst
Image Analyst 2022-1-24
And yet another option:
brightRegions = grayImage >= 200;
numBrightPixels = nnz(brightRegions);

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