Active contours image segmentation

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scorpio 09
scorpio 09 2014-4-30
评论： Image Analyst 2021-2-2
using active contours i segmented a area in an image shown below
now how to extract the segmented area??

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Image Analyst
Image Analyst 2014-4-30
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?
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Bin Qi
Bin Qi 2021-2-2
编辑：Bin Qi 2021-2-2
I have the same question. How to extract the masked part from the origional image?
----> stupid me, use matrix multiplication.
Image Analyst
Image Analyst 2021-2-2
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.

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