how to resize an object in binary image ?

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ElizabethR
ElizabethR 2016-3-20
评论： ElizabethR 2016-3-21
i try to resize (minimize) an object in binary image, but I get the whole picture is to be small. even though I just wanted to minimize only its object. please help me. thanks

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Image Analyst
Image Analyst 2016-3-20
If you want to shrink a binary image in place, without cropping out, then you can use imerode() to eat away outer layers of the binary blob(s).
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ElizabethR
ElizabethR 2016-3-20
thank you very much Image Analyst, it working perfectly.. :D may i ask one question again ? i want to convert image into polar coordinate(unit circle) with the object is on the center of the circle. i try to convert this image using cart2pol, but i can get image like this. So, how to make this image ? :D thank you so much
Image Analyst
Image Analyst 2016-3-20
You can create a circle mask as shown in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F
So if the mask is true in the circle and false outside, do
binaryImage(~mask) = true;
For what it's worth, I've also attached a circle masking demo.

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Walter Roberson
Walter Roberson 2016-3-20
You need to extract the object first and imresize() on the extracted part. Consider using regionprops with the Image property to get the extracted object.
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Walter Roberson
Walter Roberson 2016-3-20
props = regionprops(YourBinaryImage, 'Image');
extracted_image = props.Image;
smaller_extracted = imresize(extracted_image, [64 64]); %example output size
ElizabethR
ElizabethR 2016-3-21
hi Walter, thanks you so much.. it's working perfectly, now i can extract the object .. but, i want the background ( black ) still there.

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