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

Question

Mei Synn Tan 2017-3-17

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/330358-how-to-retrieval-back-the-color-in-particular-area-from-original-image

编辑： Mei Synn Tan 2017-3-20

采纳的回答： Guillaume

在 MATLAB Online 中打开

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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Answer 1

Guillaume 2017-3-17

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/330358-how-to-retrieval-back-the-color-in-particular-area-from-original-image#answer_259142

在 MATLAB Online 中打开

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 2017-3-18

在 MATLAB Online 中打开

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.

Mei Synn Tan 2017-3-20

编辑：Mei Synn Tan 2017-3-20

Dear Guillaume, It's work and thanks for helping. Have a nice day

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Answer 2

Image Analyst 2017-3-17

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/330358-how-to-retrieval-back-the-color-in-particular-area-from-original-image#answer_259219

在 MATLAB Online 中打开

Try bsxfun():

% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));

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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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