Using imshow(), set(gca, 'YDir', 'normal'), and ginput()

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Arian Kolahi Sohrabi
回答： Walter Roberson 2019-3-10
Hello,
I'm having a hard time dealing with the following issue. My intention is to set the Y direciton to normal in ginput without flipping the image I'm investigating. Here's my current code:
imshow('frame1.jpg');
hold on
set(gca, 'YDir', 'normal');
[x,y]=ginput(2);%click on body first, then head
hold off
However, this code also flips image 'frame1'. I'd appreciate it if anyone can help me find a way to prevent my image from getting flipped.

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回答（1 个）

Walter Roberson
Walter Roberson 2019-3-10
You will need to adjust the view() . Alternately, parent the image to a hgtransform and set the transform matrix so that the display comes out the way you want. Or third option: if you set the xdata and ydata properties of the image it is possible to get it to display upside down.
Have you considered just using flipud() ?
I think you will find that your requirements are inconsistent with using the results of ginput() to index into the image.

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