how to mask an image?

2013 9 19
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I = imread('E:\M.E 3rd semester\project\coding\flower.jpg');
I = rgb2gray(I);
J=ones(3,3)/9;
K = conv2(I,J,'same');
Warning: CONV2 on values of class UINT8 is obsolete. Use CONV2(DOUBLE(A),DOUBLE(B)) or CONV2(SINGLE(A),SINGLE(B)) instead.
Can anyone help to correct the error?

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Image Analyst
Image Analyst 2013-9-19
That's not masking an image - that's blurring it with a box (or sliding mean) filter. But like the others said, you need to case to double before convolving. Masking would be like setting inside or outside a region to some value or creating an ROI. For example you could mask your image so that the blurring just occurred inside a big circle in the middle of your image. Let me know if you want a masking demo.
sheno39
sheno39 2013-9-20
Thanks for your explanation. As am new to image processing in matlab it would be more helpful to me.

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Anand
Anand 2013-9-19

0 个投票

I = im2double(imread('..'));
I = rgb2gray(I);
J = ones(3)/9;
K = conv2(I,J,'same');

更多回答（2 个）

Image Analyst
Image Analyst 2013-9-20
编辑：Image Analyst 2013-9-20

1 个投票

Regarding your comment asking for a masking demo, one of mine is attached. Click on it below to see it.
Matt J
Matt J 2013-9-19

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I = double(rgb2gray(I));

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sheno39
sheno39 2013-9-19
I = double(rgb2gray(I));
Error using rgb2gray>parse_inputs (line 81) MAP must be a m x 3 array.
Error in rgb2gray (line 35) X = parse_inputs(varargin{:});
Matt J
Matt J 2013-9-19
I = imread('E:\M.E 3rd semester\project\coding\flower.jpg');
I = double(rgb2gray(I));
sheno39
sheno39 2013-9-20
thank you..

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