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Index › Programming Questions & Help › Video Capture,  Movie Playback,  Vision Libraries › How to open camera properties tab in opencv
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How to open camera properties tab in opencv? (Read 2092 times)
liudr
How to open camera properties tab in opencv?
Jun 9th, 2009, 4:05pm  
I have a video camera from the imaging source. It's default output is by8 which is incorrectly interpreted by opencv as black and white. I want to pop up a camera property dialog to adjust camera at run time and couldn't find any way to do it. Does someone know a way? I also want to set up the camera property by supplying the correct parameter to a config function when I start capturing. Is there a way? Thanks. BTW, I know it's doable in windows movie maker by pressing property button. If I don't do it I also end up with black and white.
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naus3a
Re: How to open camera properties tab in opencv?
Reply #1 - Jun 10th, 2009, 1:58am  
from your post I got the idea you don't have much experience as a programmer, so I'll keep my answer basic.

1) In opencv the black and white effect is normally done using convert(GRAY); maybe you copied and pasted some code that contained this function?

2) Movie Maker is a end user video editor, so someone wrote its configuration menus; Processing is a programming language, so your sketches will not have premade configuration utilities: id you want them you'll have to write them. Before trying to write a popup configuration window (which is possible, but you'll need to know a bit of java) I would suggest to look inside the opencv examples: hopefully you'll end up having what you need just changing a couple lines of code.

If you still have problems, try to post some code, so that we can work directly on it.
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liudr
Re: How to open camera properties tab in opencv?
Reply #2 - Jun 10th, 2009, 7:41am  
Thanks. I don't have a convert(GREY). The black white is due to a mode called Bayer 8 (any digital photographers here?Smiley. It's a raw format that some cameras supply as a default output. Color has to be calculated using a debayer code, not too hard but I'd rather let processing handle the easy stuff since it's slow.

On the other hand, if I can command the camera to output in UYVY mode, which might get processed correctly in layers below processing level, I'll get a color image. Plus I want to adjust exposure on the fly and disable auto gain and auto white balance. Is there a way to send such command to a camera via opencv, that's my question. Thanks.
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