figure, imshow, saveas and getpts

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Douglas Brenner 2016-10-13

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评论： Image Analyst 2018-4-21

I save an image using saveas. Then I open it and display it using imshow in figure 1. When I use getpts to get pixel coordinates, the coordinates I get are that of figure 1 not that of the image. I.e, If I click on the axis of the image, I don't get (0,0), I get the coordinates of the image origin in figure 1. How do I get the image coordinates?

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Image Analyst 2016-10-13

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Save images with imwrite(). Recall them with imread(). Display them with imshow(). Get pixel values with impixelinfo:

hp = impixelinfo();

This will let you mouse around and display the (x,y) and gray level in a status label on your figure. If you need the user to click on a point, then use ginput():

[x, y] = ginput();

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Douglas Brenner 2016-10-13

Got it. You have to write and read it as uint8

Image Analyst 2016-10-13

Yes, for most standard image formats. Or you could use uint16. If you want to keep as floating point instead of integers, use save() to save as a .mat file, then use load() to recall it.

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