"y-direction of the coordinate system should be reverted"

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pizzaa
pizzaa 2023-6-5
评论： Adam Danz 2023-6-5
I m kinda confused with this statement in matlab
I m trying to get x,y coordinat of and image, and someone told me that:
"y-direction of the coordinate system should be reverted"
Anyone can help me with this? ty so much
  1 个评论
Adam Danz
Adam Danz 2023-6-5
> I m trying to get x,y coordinate of and image
Does this mean you are indexing an image array and you'd like to vertically flip the image array or does that mean you want to verticallly flip the image?

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采纳的回答

Nathan Hardenberg
Normally the coordinate system starts at the top left of the image. Right is the positive x-axis and down is the positive y-axis. So the pixel in the top left would be (0,0) or (1,1) in MATLAB
Mabe this illustration helps:
Source: https://knowthecode.io/labs/basics-of-digitizing-data/episode-14

更多回答（1 个）

Steven Lord
Steven Lord 2023-6-5
Ran in:
Images and "regular" plots have different conventions for whether the Y axis should be increasing or decreasing as you move towards the bottom of the page or screen. You can use the axis function to switch between the conventions, specifying 'ij' as the ydirection input argument to put the origin in the upper-left corner rather than the lower-left.
figure
plot(1:10)
title('image xy')
figure
plot(1:10)
axis ij
title('image ij')

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