inserting image in plot?

2011 4 15
2 个回答
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更新时间：2021 3 30
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Hello,
I want to include a small .png image in a plot. I've already been looking all over, and it seems
test=imread('image.png'); axes('position',[.5 .5 .1 .1]); imagesc(test);
could do it, but the problem is: whenever I want to continue plotting other things, they will also appear in that small square, but I want them to appear in the normal/surrounding plot. How can I switch back?
Or can you maybe suggest a better method for including a small icon?
Thank you, Ruben

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Walter Roberson
Walter Roberson 2011-4-15

2 个投票

You do not need to create a new axes. Instead, you can pass position arguments to imagesc() exactly the same way you can pass them to image()
imagesc([.5 .5], [.6 .6], test)
Note, though, that the above will not position in exactly the same place as the axes() case: the position for image() and imagesc() is the coordinates of the center of the corner pixels, not the outside edge of the corner pixels.

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Ruben
Ruben 2011-4-15
Thank you for the answer, but when I try that, the icon fills ups the whole plot: more specifically:
say I first plot something on the [0 1]x[0 1] plot-square, and then use imagesc([.5 .5], [.6 .6], test), the previous plot disappears and I now see a [0 28]x[0 28]-ish plot in which my icon is smeared out upon (the icon is 28x28 pixels big, so apparently it's allocating to each pixel a big chunk of the plot)
Walter Roberson
Walter Roberson 2011-4-15
To solve the first problem, use "hold on" before using imagesc()
The second issue merely makes clear an issue you already had: you are expecting the image to be rendered in _pixel_ coordinates, but the positioning you are giving for it is in _data_ coordinates or in _normalized_ coordinates. If you were to take your existing approach and were then to make the window bigger, you would find that the image cells started occupying multiple pixels. If you want your image to be rendered in pixel coordinates no matter what the size of the axes was, then you need to tell us what _algorithm_ you wish to use for placing the image relative to the other items.
Ruben
Ruben 2011-4-16
I greatly appreciate your patience, as I have the feeling I'm being a bit daft, but I can't figure out what you mean with "tell us what _algorithm_ you wish to use". I don't have a lot of experience with matlab yet, my apologies. I hope maybe showing you what I have now would help?
test=imread('image.png');
plot([.1 .9],[.2 1]);
axis([0 1 0 1]);
hold on;
imagesc([.5 .5], [.6 .6], test);
Now is there a way to get that last image in an absolute pixel-size instead of a relative one?

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shehneela khanzada
shehneela khanzada 2021-3-30

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