Image Preview zoom question in GUIDE (with image processing toolbox)

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Sam - 2022-01-29T12:27:36+00:00
Question: Image Preview zoom question in GUIDE (with image processing toolbox)

I have created a GUI with guide with an axes (called axes2) where I want to show a video preview of what a camera sees. I want the user to be able to select different resolutions but I want the size of the preview window to be fixed by my GUI. Unfortunately, when I run the following code it just displays a corner of the image (restricted by the size of the window). If I run the preview in a separate window, it works but I want it in the screen. I think it's possible because IMAQtool allows different resolutions and the preview always fits (unless of course the preview is always at some lower resolution). axes(handles.axes2); imshow(0); handles.iris = image; preview(handles.vid, handles.iris);  

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    • Expert Answer

    Profile picture of Neeta Dsouza Neeta Dsouza answered . 2025-11-20

    image is a function - so you don't want to use that.
     
    In short you want to do something like
     
    handleToImageInAxes = image( zeros([videoRes(2), videoRes(1), numberOfBands], 'uint8') );
fprintf(1, 'About to call preview...\n');    
% Turn on the live video.
preview(vidobj, handleToImageInAxes);

    but there's more to it than that, so see the attached function.


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