how to resize an object in binary image ?

조회 수: 4 (최근 30일)
ElizabethR
ElizabethR 2016년 3월 20일
댓글: ElizabethR 2016년 3월 21일
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 2016년 3월 20일
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).
  댓글 수: 4
ElizabethR
ElizabethR 2016년 3월 20일
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 2016년 3월 20일
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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추가 답변 (1개)

Walter Roberson
Walter Roberson 2016년 3월 20일
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.
  댓글 수: 3
Walter Roberson
Walter Roberson 2016년 3월 20일
props = regionprops(YourBinaryImage, 'Image');
extracted_image = props.Image;
smaller_extracted = imresize(extracted_image, [64 64]); %example output size
ElizabethR
ElizabethR 2016년 3월 21일
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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