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Hello, so I am creating a GUI where I want to have a preview of a video, but without it opening up in another window. Is that possible? preview() opens another window, and I tried to experiment with imshow, but I'm not sure on how to really do this. My computer is attached to a camera device and I already have that setup. Thank you!

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Kevin Holly
Kevin Holly 2022-8-19

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Please see Previewing Data in Custom GUIs.
You can use the command:
preview(vid, hImage);
where hImage is the handle to the image object in which the data is to be displayed.
How are you creating your UI? Are you using App Designer?

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Chloe Soriano
Chloe Soriano 2023-2-8
Hello, yes I am using App Designer. I tried using hImage and I was using an axes object as the handle, but I get an error saying, "The specified image handle must be a valid 1XN image object handle, where N represent the specified video input's object's length." I'm not sure on how to check the dimensions of an axes object if that what it was referring to.
Walter Roberson
Walter Roberson 2023-2-8
@Chloe Soriano
You do not pass in an axes handle for the second parameter of preview(): you pass in the handle an image() object. For example,
ax = app.UIAxes2;
z = zeros(640,480,3);
hImage = image(z);
preview(vid, hImage);
It turns out to be possible for vid to be a vector of videoinput() results; in that case, hImage would have to be a row vector of image() objects the same length as vid is. This is something that would be used if you were previewing several video input devices simultaneously.
Chloe Soriano
Chloe Soriano 2023-2-22
I was able to get it to display into the UIAxes; however, it only records a small, "zoomed in" section of the vidoe input and only fits a small part of the UIAxes/doesn't extend to the edges. How to fix this?
Luiz
Luiz 2024-6-26
I am also currently trying to display a preview of my webcam and hamamatsu camera into a UIAxes within my GUI. How were you able to achieve this?

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