Why "imshow" function in GUI so slow?
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I have a GUI program which shows 10 images using "axes(handles.axes1);" and "imshow(f);" function. But when I run it, the 10 images appear sequentially but not at the same time. There's a delay between each image showing. What's wrong within it?
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Accepted Answer
Walter Roberson
on 18 Mar 2012
If you must use imshow(), then skip the axes() call and use
imshow(f, 'Parent', handles.axes1);
However, if you do not need imshow() specifically (e.g., you do not need the tools that it adds), then use
imagesc(f, 'Parent', handles.axes1);
4 Comments
Image Analyst
on 18 Mar 2012
You likely had a grayscale image and for some strange reason imagesc, unlike imshow, applies some weird colormap. To undo that you also need to call colormap(gray(256)) right after you call imagesc.
More Answers (2)
Image Analyst
on 16 Mar 2012
Call "cla reset" before each call to imshow. Otherwise all the images "stack up" in the control and it will slow down each additional time imshow is called. cla reset clears out any prior images.
6 Comments
DEBANJAN DEBNATH
on 20 Sep 2022
I want it to look like a vedio with high frame per second. Can u help?
Image Analyst
on 20 Sep 2022
@DEBANJAN DEBNATH - not enough information. You want what to "look like" a video? Please explain in your own, new discussion thread (not here).
Jan
on 16 Mar 2012
Nothing is wrong. Displaying an image needs some time.
You can use image and let drawnow trigger the screen update of the figure after all images have been inserted.
I assume posting the relevant part of the code and the size of the images might reveal other problems.
2 Comments
Jan
on 18 Mar 2012
Please post a code which reproduces the problem. I do not see a problem for using IMAGE for a binary image. But perhaps I do not know exactly, what a binary image is...
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