How to mask one image overlay ontop of a video?

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Gene
Gene 2012-8-29
Hi guys,
I wonder if I can make a image semi-transparent and mask it onto a video output? For example, I have a mask image: https://dl.dropbox.com/u/10571500/mask.jpg
and an real time video output that looks like the following image: https://dl.dropbox.com/u/10571500/under%20layer.jpg
What kind of function in the Matlab image and video processing toolbox can make the mask semi-transparent and generate a mask layer that is adjustable which will overlaying on top of the video output?
Thanks, Gene

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回答（1 个）

Image Analyst
Image Analyst 2012-8-29
Your mask doesn't look solid. Is it just a bunch of lines that you could use plot() to display? I draw outlines of things on live video all the time.
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Image Analyst
Image Analyst 2012-8-29
You have live video in an axes already, right? So then just use plot() to plot the rectangles. The video should still be live under the rectangles in the overlay.
Gene
Gene 2012-8-30
I tried to do the overlay by imshow() and set the image Alpha to semi-transparent. The imshow() is triggered through a button Callback in a GUI. But the image only displays for a second then disappear. How can I constantly show that image on top of the video as long as my "show image" button is clicked?

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