How to resize an image without changing the image display?

Question

Taoooooooooooo 2019-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/475282-how-to-resize-an-image-without-changing-the-image-display

评论： Taoooooooooooo 2019-8-8

Hi All,

I am wondering how to resize an image w/o changing the shape of the image: e.g if an image matrix is 256x256, and lets say I want to resize it to 256x10000 but the image display will look really compressed. Is it possible for me to only change the size of the image but the image display still looks like 256x256?

Sincerely,

Tao

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awezmm 2019-8-8

编辑：awezmm 2019-8-8

Do you wish to add padding on the image?

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Answer 1

Walter Roberson 2019-8-8

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https://ww2.mathworks.cn/matlabcentral/answers/475282-how-to-resize-an-image-without-changing-the-image-display#answer_386690

在 MATLAB Online 中打开

If you use image() or imagesc() or imshow(), you can pass in parameters 'XData' and 'YData' that determine where the image is to be drawn on the axes in terms of data coordinates. The center of the lower left pixel is placed at x = XData(1), y = YData(1), and the center of the upper right pixel is placed at x = XData(2), y = YData(2). If you happened to have an axes that is set to "axis equal" (that is, axis DataAspectRatio = [1 1 1]), then you could do something like

imshow(YourBigImage, 'XData', [1 256], 'YData', [1 256])

and then YourBigImage that is 256 x 10000 would be squeezed onto the display into x = 1 to 256, y = 1 to 256