Hello !
I’m doing a project for school and I have a picture that I divided in several ROI.
I used roipoly in matlab to select the ROI. Now, I would like to get the average color inside the area of the mask and replace each pixels but the average color. Here is my code :
averageColors = zeros(sum(mask(:)), 3);
for i = 1:3
channel = image(:,:,i);
averageColors(:,i) = accumarray(find(mask(:)), channel(mask(:)), [], @mean);
end

result = image;
for i = 1:3
result(:,:,i) = accumarray(find(mask(:)), averageColors(:,i), [], @mean);
end

I get an error on ligne 4 :
Unable to perform assignment because the size of the left side is 30683-by-1 and the size of the right side is 421368-by-1.
I don’t understand… find(mask(:)) and channel(mask(:)) have the same size…
Thank you for reading !Hello !
I’m doing a project for school and I have a picture that I divided in several ROI.
I used roipoly in matlab to select the ROI. Now, I would like to get the average color inside the area of the mask and replace each pixels but the average color. Here is my code :
averageColors = zeros(sum(mask(:)), 3);
for i = 1:3
channel = image(:,:,i);
averageColors(:,i) = accumarray(find(mask(:)), channel(mask(:)), [], @mean);
end

result = image;
for i = 1:3
result(:,:,i) = accumarray(find(mask(:)), averageColors(:,i), [], @mean);
end

I get an error on ligne 4 :
Unable to perform assignment because the size of the left side is 30683-by-1 and the size of the right side is 421368-by-1.
I don’t understand… find(mask(:)) and channel(mask(:)) have the same size…
Thank you for reading ! Hello !
I’m doing a project for school and I have a picture that I divided in several ROI.
I used roipoly in matlab to select the ROI. Now, I would like to get the average color inside the area of the mask and replace each pixels but the average color. Here is my code :
averageColors = zeros(sum(mask(:)), 3);
for i = 1:3
channel = image(:,:,i);
averageColors(:,i) = accumarray(find(mask(:)), channel(mask(:)), [], @mean);
end

result = image;
for i = 1:3
result(:,:,i) = accumarray(find(mask(:)), averageColors(:,i), [], @mean);
end

I get an error on ligne 4 :
Unable to perform assignment because the size of the left side is 30683-by-1 and the size of the right side is 421368-by-1.
I don’t understand… find(mask(:)) and channel(mask(:)) have the same size…
Thank you for reading ! roipoly, average, color, pixels, mask, roi, region of interest, image processing MATLAB Answers — New Questions

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