MATLAB: How to remove the circular border from the image

circular borderImage Processing Toolbox

I want to remove the white circular border in the images attached. I need only those white spots in the image. Please help me with a matlab code for the same.

Best Answer

Is the circle in the same location for every image? If so, see code in the FAQ for how to create a circle mask that you can multiply by your image or use as logical indexes to "erase" the circle. If not, you'll have to do something fancier and additional questions will need to be answered, like are all the blobs inside the circle or can they be outside, do any of the blobs touch the circle, etc.

Related Solutions

MATLAB: Counting holes in an image

Threshold then call imclearborder() and bwlabel(). Assuming you have dark holes on a bright background:

% Binarize:
binaryImage = grayImage < someValue;
% Remove those touching border
binaryImage = imclearborder(binaryImage);
% Count holes:
[~, numHoles] = bwlabel(binaryImage);

MATLAB: How to remove white border from image

Try this:

rgbImage = imread('visionteam.jpg');
hold on
imshow(rgbImage,'Border','tight') 
whiteSquare = 255 * ones(100, 100, 'uint8');
rgbImage(1:100, 1:100, 1) = whiteSquare; % Load into red channel.


rgbImage(1:100, 1:100, 2) = whiteSquare; % Load into red channel.
rgbImage(1:100, 1:100, 3) = whiteSquare; % Load into red channel.
imshow(rgbImage)
% imwrite(rgbImage, filename); % Save to disk if you want.

Best Answer

Related Solutions

MATLAB: Counting holes in an image

MATLAB: How to remove white border from image

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