Changing pixel figure coordinates when using imshow

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James Usevitch 2020-7-31

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评论： James Usevitch 2020-8-2

When I use imshow to plot the pixels represented by a matrix, each pixel is centered in the figure at its matrix coordinates (e.g. the pixel on row 1, column 1 is centered at figure coordinates (1,1)).

Is it possible to change this so that a specific corner of each pixel is positioned at its matrix coordinates? For example, can the pixel on row 1, column 1 be plotted with its lower right corner at figure coordinates (1,1), and so on for all the remaining pixels?

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Answer 1

Image Analyst 2020-7-31

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After you call it, try this:

axis xy

xy — Default direction. For axes in a 2-D view, the y-axis is vertical with values increasing from bottom to top.
ij — Reverse direction. For axes in a 2-D view, the y-axis is vertical with values increasing from top to bottom.

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James Usevitch 2020-8-2

Thanks for this tip! This is much more compact than using set(gca,'Ydir','reverse').

I actually discovered that using the command image(x,y,C) answers my question--it lets you control the figure coordinates of the plotted image pixels. Sorry if the original question wasn't clear.

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