why getpts doesn't give the correct points?

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David Armendáriz
David Armendáriz 2019-4-20
回答： Walter Roberson 2019-4-20
I have the following image:
car1.PNG
When I plot the points got by getpts, the image is flipped upside down:
car2.PNG
My code is the following:
figure
imshow("carro.png")
[x,y] = getpts;
plot(x,y,'b*')

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Walter Roberson
Walter Roberson 2019-4-20
imshow() by default sets YDir reverse so that the "top" of the array (lowest row number) appears at the top of the screen (which would otherwise correspond to highest row number).
When you then plot the points without YDir reverse then they appear upside down.

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