Hi Thad, [...] > > > start streaming when you need an image. You can stop streaming right > > > after getting the data, and start again later when required by your > > > application. > > > > Laurent, I think Thad was talking about actual still image support (UVC > > standard, section 2.4.2.4), which can - if the camera supports it - > > provide better quality than the streaming modes. > > Yes, this is exactly right. The QC notebook pro can capture a still > image at 1.3 megapixel, much better than any single frame when it > is streaming. This is one of the few webcams that can produce stills > of that quality that and is definitely the smallest I've found. That is > important for my application; I plan to suspend it on a flexible arm > over my drafting table to use it as part of my animation toolchain.
The good news is the QC notebook pro can capture video at 1.3 megapixel as well :-) All UVC webcams I am aware of implement still image capture method 1, which means they don't implement still image capture at all (method 1 emulates still image capture in software). > > It would be great if you could actually implement that. We've had > > discussions about how best to do it before and didn't actually reach a > > conclusion. My personal favorite is this: dd if=/dev/video0 > > of=mystillpicture.jpg > > > > If that's in the spirit of V4L2 or not is probably subject to discussion > > and there are several other ways to do it, so if you want to have a go, > > we'll be happy to help. That's on my todo list, but I currently lack hardware to test this on. Is anyone aware of a webcam implementing still image capture method 2 or method 3 ? Cheers, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
