Hello
As per my understanding of your query you wish to mask the region other than the yellow-colored part of the image. You can convert the color image to binary and the white pixels represent the yellow-colored part acting as a mask. When you multiply the binary image with colored one. You get only the yellow-colored part and rest will be black. The following code will help to visualize the above.
clear all;
img=imread('SamplePicIR.png');
i=rgb2gray(img); %rgb to gray conversion
imshow(i);
bin=imbinarize(i);%gray to binary conversion
imshow(bin);
bin2(:,:,1)=bin;
bin2(:,:,2)=bin;
bin2(:,:,3)=bin;
z=immultiply(img,bin2);%Applying bin2 as a mask
imshow(z);
For more information, please refer to the following links:
- Multiply two images or multiply image by constant - MATLAB immultiply (mathworks.com)
- Binarize 2-D grayscale image or 3-D volume by thresholding - MATLAB imbinarize (mathworks.com)
Hope it helps!
