How do I remove the square box surrounding on the single digit?

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Rinku 2015-1-19

编辑： suraj tarade 2017-10-5

when i try to recognize the digit that surrounded by square box ,but i can't remove the edges of the square box.can anyone tell how do i remove??

Image Analyst 2015-1-19

Threshold it, fill it, then call imerode() to shrink the binary blob.

binaryImage = grayImage > 128;
binaryImage  = imfill(binaryImage , 'holes');
erodedImage = imerode(binaryImage, true(9));

Then subtract from original binary image to get just the straight borders.

maskImage = binaryImage - erodedImage;

Then use that as a mask to assign any other value, such as 0 or 128 or whatever.

grayImage(maskImage) = 0;

Or you can use nearby image image values if you want by using roifill(). Give it a try and come back with your code attempt if you still need help.

Like I said, "For the first image, you can check if the centroid of one blob is inside the bounding box of a different blob. " If you don't know how to find centroids and bounding boxes, then see my tutorial http://www.mathworks.com/matlabcentral/fileexchange/25157-image-segmentation-tutorial---blobsdemo-- It goes over that in well-commented detail.

Rinku 2015-1-27

thank you for your quick reply.I try these code.

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