image segmentation

Question

Gaurav Kaila 2011-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/2646-image-segmentation

Hey, Im trying to segment out a polygon region out of an image. I have already got the boundary pixels . Can you please help me in finding out the pixel values inside the boundary.

Thank You

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Answer 1

Sean de Wolski 2011-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/2646-image-segmentation#answer_4141

在 MATLAB Online 中打开

Okay, use IMFILL or POLY2MASK to generate a logical mask and then multiply it by the image to preserve the content inside the mask. I.e.

For grayscale images:

Imasked = I.*cast(Mask,class(I));

or for RGB images:

Imasked = bsxfun(@times,I,cast(Mask,class(I)));

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Answer 2

Sean de Wolski 2011-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/2646-image-segmentation#answer_4136

在 MATLAB Online 中打开

 doc imfill
 doc poly2mask

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Answer 3

Gaurav Kaila 2011-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/2646-image-segmentation#answer_4140

Thanks For Replying, but i have already tried these functions. What i need is , that image part that i am segmenting out, is displayed as an image itself with its original data inside it.

Like when we crop an image, the original data of the cropped image remains in it.