extraction of part of image

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Smruti Khobragade
Smruti Khobragade 2020-1-28
回答： Subhadeep Koley 2020-2-1
hello,
i want to extract some part of original image bsed of pixel values. for example i want to extract part which have pixel values greater than 200 and other part to be blackened .i dont wanna use im crop bcoz the part i want to extract should depend on pixel values.

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Subhadeep Koley
Subhadeep Koley 2020-2-1
Hi Smruti, the below code might help as you want "to extract the part of original image based on pixel values the output will be same image with threshold 200 and other blacken".
Also you might want to use the Color Thresholder App.
img = imread('peppers.png');
[r, c, b] = size(img);
th_img = uint8(zeros(r,c,b));
th = 100; % Put your threshold here
for i = 1:r
for j = 1:c
if img(i, j, :) > th
th_img(i, j, :) = img(i, j, :);
end
end
end
figure, imshowpair(img, th_img, 'montage');
untitled.png

更多回答（1 个）

Bhaskar R
Bhaskar R 2020-1-28
im = imread('peppers.png'); % read image
res_image = uint8(im>200).*im; % apply your condition
figure, imashow(res_image);
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Smruti Khobragade
Smruti Khobragade 2020-1-28
i want to extract some part of original image bsed of pixel values. for example i want to extract part which have pixel values greater than 200 same as the original image not just same color
i mean to say to extract the part of original image based on pixel values the output will be same image with threshold 200 and other blacken.

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