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

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??

Answer 1

[Image Analyst]

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.

[Rinku]

Thank you for reply.. I tried these method but got not answer ..In image,I have to remove the square box surrounded on numerical single digit.Example as box on three[3] and Zero[0] .. so please can you give any idea??????

[Image Analyst]

For the first image, you can check if the centroid of one blob is inside the bounding box of a different blob. For the left image you'll just have to figure out some characteristics of the blob that resemble a rectangle, but it looks hard because your character 0 actually blends into the box and is not distinct/separate/disconnected.

[Rinku]

For first Image , what can i do for remove the square box??????

[Image Analyst]

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]

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

Answer 2

[suraj tarade]

Hi i also want solution for the same please find below link for details https://in.mathworks.com/matlabcentral/answers/359858-i-want-to-remove-border-surrounding-on-character