As I mentioned my platform is limited to USB 1.1. I'm now using a Logitech Quickcam Pro 9000 and like most webcams it offers less functionality in USB 1.1 mode. It only offers 160x120 in YUV mode and upto 800x600 in MJPG mode. The image quality appears to scale with the max requested framerate. 800x600 @ 5fps produces reasonable images but if possible I like to get better image quality. Increasing the fps reduces image quality as more compression is used to squeeze all the data over the bus.
If I would use still image the timing / buffering constraints would get relaxed, would I able to reach a higher resolution that way? Roderick -----Original Message----- From: Laurent Pinchart [mailto:[EMAIL PROTECTED] Sent: Wed 4/16/2008 10:42 PM To: [email protected] Cc: Colenbrander, Roderick; Brandon Philips Subject: Re: [Linux-uvc-devel] High resolution webcam + USB 1.1 (LX832) On Wednesday 16 April 2008, Colenbrander, Roderick wrote: > I read about the still image mode before but is it really anything special? > Some sources indicate that it just grabs a frame from the video stream. The > request is either made by the webcam software or by pressing a snapshot > button. Sure I can program but is it worth all the troubles? The main > advantage would be improved image quality. It all depends on the hardware. The UVC spec defines several method to capture still images. The most common one, implemented by all the webcams I've tested so far, is to take the next image from the video stream. This won't help improving image quality. Best regards, Laurent Pinchart ##################################################################################### Disclaimer Deze email en alle hiermee verzonden bestanden zijn vertrouwelijk en alleen bestemd voor diegene aan wie de e-mail is geadresseerd. Indien u ten onrechte deze email heeft ontvangen waarschuw dan de systeembeheerder. ([EMAIL PROTECTED]) Deze voetnoot bevestigt dat deze email is gecontroleerd op aanwezigheid van computer virussen. Disclaimer This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager ([EMAIL PROTECTED]) This footnote also confirms that this email message has been swept for the presence of computer virusses. ##################################################################################### ##################################################################################### This e-mail message has been scanned for Viruses and Content and cleared by MailMarshal ##################################################################################### _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
