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Index › Programming Questions & Help › Video Capture,  Movie Playback,  Vision Libraries › USB Webcam over Network - JMyron Display Problems
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USB Webcam over Network - JMyron Display Problems (Read 1285 times)
iasonf
USB Webcam over Network - JMyron Display Problems
Jun 13th, 2009, 10:10am  
hello everyone,

we are using the UsbOverNetwork Software (www.usb-over-network.com) to directly share USB-Webcams between 2 WindowsXP Computers. PC1 uses the Webcam of PC2 and vice versa. This works really great, almost no delay even at 1600*1200.

BUT:
With the JMyron library we can set the cameras image-size only to 160*120 Pixels without getting the usual Display Errors (grey Picture with multiple stretched images) .  
The getForcedWidth/Height Function prints out 160*120 (reason for the errors at higher resolutions).

With the OpenCV Library the camera-image is displayed correctly at all resolutions. But it gets very slow ( up to 1 sec delay) at higher resolutions.

So we would like to stick with the JMyron-Library but we cant figure out how to change the resolution that JMyron offers for the cameras.
Is there a Windows Tool or a way in Processing to change this?

greets iason
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liudr
Re: USB Webcam over Network - JMyron Display Problems
Reply #1 - Jun 16th, 2009, 9:43pm  
I wanted to ask the same question. The JMyron library has the nice feature of popping camera properties dialogs but not camera encoding and resolution dialogs, which is what I really want. I don't have much problem with resolution since my industry camera has one resolution only. But somehow the camera is in a default mode (BY8) and no filters is inserted so all I see is grey image. I'm thinking of writing a debaying filter in processing but don't know how slow it will be in 640*480 mode. If only the library has a mode/resolution dialog Sad

One comment on openCV. I tested the opencv samples written in c++ outside processing. The fps is same as using processing with opencv. Displaying image in processing does slight drop the fps but I think it's the opencv library for windows that is slow.
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