Jit.qt.grab with external camera. Latency problem.

Mar 2, 2010 at 11:07am

Jit.qt.grab with external camera. Latency problem.

Dear All
I m working on a vision analysis program which requires real time performance on camera then process in Jitter.
So I borrowed a pro-camera from university (firewire) then use it as a real time image capture by using jit.qt.grab. However, the result shows massive latency and worse than web-cam, even though the image quality is better, It is very hard to carry on the analysis.
So, can any one give me some suggestion? Can this problem be fixed or improved?
All the best
Yang

#48657
Mar 2, 2010 at 4:16pm

Do you use [qmetro] with a low value, for example : [qmetro 2] ?
When you said “latency” you mean time refresh of the image or delay of displaying ?

#174896
Mar 2, 2010 at 8:24pm

yes, the qmetro is set to 2. And normally below 30 wouldnt see many difference.
And by latency i mean the delay of displaying.
Thank you Yot.~

#174897
Mar 2, 2010 at 9:03pm

Wich model ? Which codec ? Wich drivers ? Mac or PC ?
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#174898

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