How can I zoom into preview window while updating

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Steffio
Steffio 2013-2-25
Hello,
I have only recently begun using Matlab Image Acquisition Toolbox for image acquisition with an industrial GigE camera. For a first start, I have been using the basic functions with the wizard to capture images, set the exposure time etc.
In my application, I have a very small area of interest in the image. So it is difficult to focus the camera on this small detail. I would like to zoom into the preview window while it is showing live the changes, so that I can see my ROI in detail and see when the focus is correct. Can anybody help me with this? I have not found any information about zooming into the displayed window/preview window.
Thanks Steffio

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回答（1 个）

David Tarkowski
David Tarkowski 2013-2-25
You can change the ROI by setting the ROIPosition property. The IMAQTool GUI will allow you to do this interactively.
  2 个评论
Steffio
Steffio 2013-2-26
Thank you. I can postiion a ROI, but what I want is an enlarged view of it. For example 500%, so that I can see individual pixels in the window.
David Tarkowski
David Tarkowski 2013-2-26
The preview window always displays previewed images at 100% zoom (i.e. one screen pixel for one image pixel). If you want to zoom as you describe, you'll need to implement a custom preview window. You can see http://www.mathworks.com/help/imaq/previewing-data.html#f11-76067 for an example of how to do this.

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