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hello everyone. How to make the direction of points drawn on Cartesian coordinate system consistent with that drawn on binary image.

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Wesley
Wesley on 2 Jun 2021
Commented: Wesley on 2 Jun 2021
Hello everyone. How to make the direction of points drawn on Cartesian coordinate system consistent with that drawn on binary image. From these two images, we can see that the direction of the points in Cartesian coordinate system is opposite to that in binary image. Thank you very much.
Binary image:
Points drawn in Cartesian coordinate system:

Accepted Answer

Joseph Cheng
Joseph Cheng on 2 Jun 2021
in a displayed image (0,0) is top left corner but cartesian is bottem left if in the ++ quadrant. so remedy this you can set the displayed direction as normal.
set(gca,'Ydir','normal')
where you can replace gca (get current axis) with the axis handle if you already defined that

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