How do I separate the white pixel data from binary image?

Question

Ritwik Dhar 2019-7-23

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https://ww2.mathworks.cn/matlabcentral/answers/472944-how-do-i-separate-the-white-pixel-data-from-binary-image

评论： mohd akmal masud 2019-7-30

采纳的回答： KALYAN ACHARJYA

Basically, I applied thresholding using Otsu's method and it gave me the below image.

I want to separate the white pixel data from this binary image and convert it back to the rgb image for further use.

How do I separate the white pixels?

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Ritwik Dhar 2019-7-24

Sorry for that..

mohd akmal masud 2019-7-30

i think the question is how to calculate the no of pixel of white? if im not wrong

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Answer 1

KALYAN ACHARJYA 2019-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/472944-how-do-i-separate-the-white-pixel-data-from-binary-image#answer_384483

编辑：KALYAN ACHARJYA 2019-7-24

在 MATLAB Online 中打开

I want to separate the white pixel data from this binary image and convert it back to the rgb image for further use.

What I undestood (and certainly sure), you want to mask the binary image on RGB Image. No need to ectract the white pixels from Binary Image (just index position of white pixels is sufficient). You can directly apply it on RGB Image. In the following example, forced the pixels to those in RGB Image, where mask (Binary Image) represents as white pixels.

RGBImage=imread('image_test.jpg'); % This RGB Image
subplot(131),imshow(RGBImage),title('RGB Image');  
grayImage=rgb2gray(RGBImage);
bwImage=im2bw(grayImage,0.7);  % This is your Result of Otshu Thresholding
subplot(132),imshow(bwImage),title('Binary Image-Mask');
% Apply the Mask (Binary Image) on RGB
mask=cat(3,bwImage, bwImage,bwImage);
% Force all those pixels to Black, where white pixels represent in Binary Image
RGBImage(mask)=0;
subplot(133),imshow(RGBImage),title('RGB with Black White Mask Area');