Oliviawilliams02 asked . 2020-09-26

image processing from webcam

I have an image with a large rectangle and inside that rectangle there are a red circle and a green circle.And I want to locate the center of red circle with the origin-coordinate is one of the corners of rectangle.Everything has been finished with an image I draw in power point.But when I draw that image on a real paper and using a webcam to capture that image,I cann't do the same things as I do with ppt image.When I convert the real image to binary,the rectangle,in some parts,is not separated with background and some areas of background dont't have the same color(black or white) with others.I try to reduce threshold but it is still bad.I just want to separate the rectangle with background to "label" it and then I do anything I do with ppt image.

matlab , image processing,

Expert Answer

Neeta Dsouza answered . 2024-12-21 17:20:47

I would do this with:

I = imread('answers425.jpg'); %your_image
M = shrinkWrap(I(:,:,1),'objthresh',3000,'biggest'); %shrinkwrap it and keep only biggest object
subplot(121)
imshow(M); %show mask
subplot(122)
imshow(bsxfun(@times,uint8(M),I)); %show mask applied

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