How to obtain a group of pixels on an image

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Yuan Yuan Lin
Yuan Yuan Lin 2020-11-23
回答： KSSV 2020-11-23
I have an image and I want to obtain a group of pixels with a distance of about 50 pixels each for both row and column for the entire image.
This is my code so far.
I = imread('balloon.jpg');
[row, col, channel] = size(I);
a = 0;
X = 1 : 50 : col;
for x = 1 : 50 : col
for y = 1:50:row
I(50,x,:) = [255,0,0];
I(y, 50, :) = [255,0,0];
end
end
imshow(I)

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采纳的回答

KSSV
KSSV 2020-11-23
If I is an image, you can use:
iwant = I (1: 5: end, 1: 5: end, :);

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