From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail01d.mail.t-online.hu ([84.2.42.6]:50110 "EHLO mail01d.mail.t-online.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751144AbZIKHJW (ORCPT ); Fri, 11 Sep 2009 03:09:22 -0400 Message-ID: <4AA9F7A0.5080802@freemail.hu> Date: Fri, 11 Sep 2009 09:09:20 +0200 From: =?ISO-8859-2?Q?N=E9meth_M=E1rton?= MIME-Version: 1.0 To: Thomas Kaiser , Jean-Francois Moine CC: V4L Mailing List Subject: image quality of Labtec Webcam 2200 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi, I have a Labtec Webcam 2200 and I have problems with the image quality with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored each captured image as raw data and when libv4l was able to convert then I also stored the result as bmp. You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html There are three types of problems: a) Sometimes the picture contains a 8x8 pixel error, like in image #9 http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 b) Sometimes the brightness of the half picture is changed, like in images #7, #36 and #37 http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 c) Sometimes the libv4l cannot convert the raw image and the errno is set to EAGAIN (11), for example image #1, #2 and #3 Do you know how can I fix these problems? Regards, Márton Németh