Hi Natalai, No one has suggested this yet, but you might want to look at whether you are using the right setting in terms of PAL/NTSC etc. If xawtv looks good but vic does not this implies that is an application level problem, not a camera problem. If you don't have the right video settings we find that the image becomes almost a greyscale image etc. This might be the problem.
Brian Natalia Costas Lago wrote: > > Thank you for the hints, in xawtv the image is not that bad, but in VIC it's > terrible (colors and definition), it doesnt make much difference to increase > quality and bandwith to the maximun. I was wondering wich tricks or codecs > do people use. Am I wrong in my thought about h261 being the only codec > available to AG2.1.2? > > > >>Nothing about your equipment, of itself, should cause any major >>image quality deterioration. Of course, if the camera has been >>used before and left pointed at a bright source for a long time, >>say in a surveillance role, it could be the problem. Equally if >>someone has set up the monitors for a particular application, they >>could be the problem. If you have a decent AV department around, >>you could try to eliminate the camera as the problem by plugging >>in a video signal generator instead, with it set to colour bars, >>and see how they come out - they should really shine on a PC >>monitor. If they do, then try a different camera. If they don't, look >>at the display side of things. Make sure you don't have any >>excessive cable runs - many cameras don't have very powerful output >>drivers and the first thing to go can be colour. Also check you >>are using proper video cable from camera to capture card - an >>underspecified cable will lose high frequencies (say above 3 MHz) >>more than lower ones, and so reduce the colour information. >> >>Cheers >> >>Chris >> >>____________________________________________________________________ >>Chris Osland Office tel: >>+44 (0) 1235 446565 >>Digital Media and Access Grid Medialab tel: >>+44 (0) 1235 446459 >>BIT Department Access Grid room >>tel: +44 (0) 1235 445666 >>e-mail: c.d.osl...@rl.ac.uk >>Fax: +44 (0) 1235 445597 >>CLRC Rutherford Appleton Laboratory (Bldg. R18) >>Chilton, DIDCOT, Oxon OX11 0QX, UK >>[The contents of this email are confidential and are for the use of the >>intended recipient only. >>If you are not the intended recipient do not take any action on it or >>show it to anyone else, >>but return this email to the sender and delete your copy of it.] >> >> >> >> >> >> >>>-----Original Message----- >>>From: owner-ag-t...@mcs.anl.gov [mailto:owner-ag-t...@mcs.anl.gov]On >>>Behalf Of Natalia Costas Lago >>>Sent: 13 May 2004 08:43 >>>To: ag-t...@mcs.anl.gov >>>Subject: [AG-TECH] Image quality >>> >>> >>> >>> >>>Hi all, >>> >>> >>>We have noticed that image color in our videostream seems to >>>have a lack of >>>....accuracy to reality... i've seen other video streams that seem to >>>reflect colors better and probably in a more real way. I was >>>wondering where >>>in the chain we can fix that. We are using a provisional Sony EVI D30 >>>camera, pinnacle pctv pro capture cards (i've tried as well >>>with osprey 500, >>>osprey 100 and hauppauge wintv go). Our display grahpics card >>>is a nvidia >>>quadro nvs and, finally, our display right now is composed of >>>a brand new >>>fujitsu TFT and a plasma TV. >>> >>>The codecs we are using are h261 (i think h263 cant be used >>>with AG2.1.2 so >>>far, is there any date about when will it be available?). >>> >>>Can anyone give us a piece of advice where we can improve our >>>video quality? >>> >>>Kind regards and thank you in advance. >>>Natalia. >>> >>> >>>----------------------------------- >>>Natalia Costas Lago >>>email: nata...@cesga.es >>> >>>Centro de Supercomputacion de Galicia (CESGA) >>>Avenida de Vigo, s/n Campus Sur >>>15705 Santiago de Compostela - SPAIN >>>Tel: +34 981 56 98 10 >>>Fax: +34 981 59 46 16 >>>http://www.cesga.es/ >>> >>> > > > > > ----------------------------------- > Natalia Costas Lago > mailto: nata...@cesga.es > > Centro de Supercomputacion de Galicia (CESGA) > Avenida de Vigo, s/n Campus Sur > 15705 Santiago de Compostela - SPAIN > Tel: +34 981 56 98 10 > Fax: +34 981 59 46 16 > http://www.cesga.es/ > >
