MATLAB: How to create a mask

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I am trying to create a mask for an image which has multiple circles in it. I have tried using filledCircle function. But it only adds the circle to the figure, and does not change the image itself.

I there any other way I can create the masks given the centers and the radii of the circles?

Best Answer

You can use the FAQ - it creates a circle that can be used as a mask. http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

Also, see my attached demos.

Related Solutions

MATLAB: Mask

A "mask" is binary in Matlab. It is the mask only! If you want to get the pixel values inside the mask, you either multiply the mask with the image matrix (size remians the same) or use the mask for indexing (result is the masked rectangle only).

Please post your code and explain, what you want to achieve.

MATLAB: Create mask over image

You should not use the variable name input as it shadows a MATLAB built-in function. Use the example code below.

close all; clc;
img = im2double(imread('peppers.png'));
figure; imshow(img);
title('Original RGB image');
mask  = im2double(imread('peppersMask.png')); % Download the mask attached below
figure; imshow(mask);
title('Mask');
if size(mask, 3) == 1 && size(img, 3) > 1
    mask = repmat(mask, [1, 1, size(img, 3)]);
end
CorruptedImage = mask .* img;
Q = mask(:, :, 1);
Red = CorruptedImage(:, :, 1);
Gre = CorruptedImage(:, :, 2);
Blu = CorruptedImage(:, :, 3);
figure; imshow(CorruptedImage);
title('CorruptedImage');
figure; montage(CorruptedImage, 'Size', [1, 3]);
title('R, G, B component of the CorruptedImage');

Best Answer

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MATLAB: Mask

MATLAB: Create mask over image

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