How to retrieval back the color in particular area from original image?

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Mei Synn Tan
Mei Synn Tan 2017-3-17
编辑： Mei Synn Tan 2017-3-20
13100.jpg
colorImage = imread('13100.jpg');
grayImage = rgb2gray(colorImage);
mserRegions = detectMSERFeatures(grayImage);
mserRegionsPixels = vertcat(cell2mat(mserRegions.PixelList));
mserMask = false(size(grayImage));
ind = sub2ind(size(mserMask), mserRegionsPixels(:,2), mserRegionsPixels(:,1));
mserMask(ind) = true;
figure;imshow(mserMask);
MSER mask
How to retrieve back the original color from 13100.jpg and paste into MSER mask (white area)?

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采纳的回答

Guillaume
Guillaume 2017-3-17
Much simpler:
maskedimage = immultiply(colorImage, repmat(mserMask, [1, 1, size(colorImage, 3)]));
imshow(maskedimage);
Note that if you just want to see if your mask is correct
imshowpair(colorImage, mserMask, 'blend');
may be more useful.
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Guillaume
Guillaume 2017-3-18
That's because you're only setting the red plane to 255, leaving the green and blue plane.
whiteMaskedImage(repmat(~mserMask, 1, 1, 3)) = 255;
would fix this.

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更多回答（1 个）

Image Analyst
Image Analyst 2017-3-17
Try bsxfun():
% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
  1 个评论
Mei Synn Tan
Mei Synn Tan 2017-3-18
编辑：Mei Synn Tan 2017-3-18
Good afternoon to KSSV, Guillaume and Image Analyst, Thanks for helping. Both immultiply & bsxfun function can be use and get the correct result. Thanks and have a nice day.
How to change or convert the black area to white color?

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