Active contours image segmentation

using active contours i segmented a area in an image shown below

now how to extract the segmented area??

Answer 1

[Image Analyst]

activecontour() returns a binary image that is the segmentation. Now describe very exactly what you mean by "extract". Does that mean measure with regionprops()? Does that mean cropping to a new, smaller image with imcrop()? "Extract" is not a very specific term. What does it mean to you?

[scorpio 09]

for example below figure shows the active contour detected region..

now i want to extract that detected region as shown below

i used imcrop() but the result is not correct

[Image Analyst]

Again, "activecontour() returns a binary image" so I don't understand why you're asking. It gives it to you!

[Bin Qi]

I have the same question. How to extract the masked part from the origional image?

----> stupid me, use matrix multiplication.

[Image Analyst]

If you want to mask the original image, no matter whether gray scale or RGB, you can use this code:

% Mask the image using bsxfun() function to multiply the mask by each channel individually.  
% Works for gray scale as well as RGB Color images.
maskedImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));

If you have a gray scale image, you can also multiply:

maskedImage = grayImage .* uint8(mask); % or uint16

or you can erase using logical coordinates:

maskedImage = grayImage; % Initialize
maskedImage(~mask) = 0; % Erase outside the mask.