Imshow vs mesh: Filter response flipped?

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Sndn_Shr 2017-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/365082-imshow-vs-mesh-filter-response-flipped

评论： Guillaume 2017-11-4

采纳的回答： Guillaume

This is the same 2-D frequency response plotted using imshow and mesh. Why is the response flipped in imshow?

Using imshow:

Using mesh:

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Guillaume 2017-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/365082-imshow-vs-mesh-filter-response-flipped#answer_289431

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By convention for images the origin is the top left corner and the y axis points down. You can see that clearly if you make the axis visible after displaying your image:

imshow(yourimage);
axis on

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Sndn_Shr 2017-11-4

Thanks for the explanation! Is there a way to move the origin? to bottom-left and center?

Guillaume 2017-11-4

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As documented,

axis xy

to force the y axis to go up instead of down.

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