square image size whitout changing in original image shape

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hamed 2014-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/142754-square-image-size-whitout-changing-in-original-image-shape

评论： Image Analyst 2014-7-23

Hi guys . i have an image (size is 256x158) for computing zernike momentum i have to change my image size to N x N for example 256 x 256 . but unfortunately my image shape will be changed . i want to have my original image without changing . could you help me how can i resize my columns and rows without changing in my original image shape ? i have an idea . how can i add white pixels to my image for resizing like that image i attached (center oval for example is my image and white background for resizing in N x N size )

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Answer 1

Joseph Cheng 2014-7-21

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编辑：Joseph Cheng 2014-7-21

在 MATLAB Online 中打开

If you're looking to pad the columns as there are enough rows to get youre 256x256 then.

 Oimage = imread(____);  %your original image
 %ones padded to either side of image, multiply by the white color index.
 PadImage = [ones(256,49) Oimage ones(256,49)];

That should get you the 256x256 sized image. If you're trying to resize it so there is a 1.6 times magnification to scale the smaller columns to 256 and trim off the extra rows then imresize() should work out.

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hamed 2014-7-23

编辑：hamed 2014-7-23

with im2double solved my problem . my mistake was I = double(image);

Image Analyst 2014-7-23

Another mistake is using a jpeg image for image analysis. Just look at those horrible compression artifacts.

I don't know what you did with im2double() and double() but it's not necessarily a mistake to use double() - I do it all the time and never use im2double().

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