Count all green pixels above a threshold and colour them

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Jonas Müller 2020-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/593989-count-all-green-pixels-above-a-threshold-and-colour-them

评论： Jonas Müller 2020-9-16

I would like to evaluate an image with the Imageprocessing toolbox. More precisely, I would like to count all green pixels that are above a threshold. Afterwards all used pixels should be coloured, so that it is visually traceable which pixels were used.

How is this possible?

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回答（1 个）

Ameer Hamza 2020-9-15

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编辑：Ameer Hamza 2020-9-15

在 MATLAB Online 中打开

See this example, this take the green channel of input image, find all pixels above a threshold, and give them red color.

img = im2double(imread('pears.png'));
r = img(:,:,1);
g = img(:,:,2);
b = img(:,:,3);
mask = g > 0.7;
r(mask) = 1;
g(mask) = 0;
b(mask) = 0;
img_new = cat(3, r, g, b);