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

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)?

Answer 1

[Guillaume]

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.

[Mei Synn Tan]

How to change or convert the black area to white color?

whiteMaskedImage = maskedimage;
whiteMaskedImage(~mserMask) = 255;
imshow(whiteMaskedImage);

Why it's turn to red color?

[Guillaume]

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]

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

Answer 2

[Image Analyst]

Try bsxfun():

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

[Mei Synn Tan]

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?