將位置轉換爲二進制蒙版並使用此類蒙版過濾圖像

Question

假設我們有一個圖像，其像素標記爲1和2。我們如何在MATLAB中做到以下幾點？

• 轉換的1s和2s位置成二進制口罩
• 過濾圖像與那些面具

感謝。

Answer 1

例子：

% some RGB image 
img = im2double(imread('peppers.png')); 
[h,w,~] = size(img); 

% lets create some random labels. I'm simply dividing into two halves, 
% where upper half is labeled 1, and lower half labeled 2 
labels = [ones(h/2,w)*1; ones(h/2,w)*2]; 

% compute masks and filter image using each 
img1 = bsxfun(@times, img, labels==1); 
img2 = bsxfun(@times, img, labels==2); 

% show result 
subplot(121), imshow(img1) 
subplot(122), imshow(img2)