From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mailex.mailcore.me ([94.136.40.62]:35686 "EHLO mailex.mailcore.me" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754480AbaDWPnI (ORCPT ); Wed, 23 Apr 2014 11:43:08 -0400 Message-ID: <5357DAC2.20005@sca-uk.com> Date: Wed, 23 Apr 2014 16:22:42 +0100 From: Steve Cookson MIME-Version: 1.0 To: Linux Media Mailing List Subject: Comparisons of images between Dazzle DVC100, EasyCap stk1160 and Hauppauge ImapctVCB-e in Linux. Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi Guys, I would be interested in your views of the comparisons of these images. The still is the image of a duodenum taken during an endoscopy and recorded to a DVD player (via an s-video or composite cable). Although the endoscope is an HD endoscope, the DVD recorder isn't and the resulting video is 720x480i59.94. Here are further details of the video:- Format : MPEG Video v2 Format profile : Main@Main Format settings, BVOP : Yes, Matrix : Custom, GOP : M=3, N=15 Bit rate mode : Variable Bit rate : 4 566 Kbps Maximum bit rate : 10 000 Kbps Width : 720 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 29.970 fps Standard : NTSC Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan order : Top Field First Compression mode : Lossy Bits/(Pixel*Frame) : 0.441 The video was played through Dragon Player and the video signal has exited through a mini-VGA port defined as 640x480 and passed through a VGA->S-Video converter to an s-video cable. The cable has in turn been connected in turn to a Dazzle DVC100, an EasyCap stk1160 and a Hauppauge ImapctVCB-e. Each setting (eg brightness and contrast etc) has as near as possible to mid-range and a screengrab taken. The results are shown here: Original: http://tinypic.com/usermedia.php?uo=fNkd6hpTbcMrgmD6gSf74Ih4l5k2TGxc Dazzle DVC100: http://tinypic.com/usermedia.php?uo=fNkd6hpTbcMaOf4QTsIefYh4l5k2TGxc ImpactVCB-e: http://tinypic.com/usermedia.php?uo=fNkd6hpTbcM7i72IqGujuIh4l5k2TGxc STK1160: http://tinypic.com/usermedia.php?uo=fNkd6hpTbcPO7kmQk/IS94h4l5k2TGxc I would be grateful for your views on the quality of the images. Is one of materially higher quality than the others, or can I adjust the settings to improve the quality of one of them more. It seems to me that the Hauppauge is marginally better than the others. What do you think? Can I improve the test? Regards Steve.