On Wed, 1 Jul 2009, Valentin Longchamp wrote: > Guennadi Liakhovetski wrote: > > > > While trying all possible skipping / binning combinations of mt9t031 I > > came across a problem, that in some configurations the sensor produces > > regular horizontal stripes. They depend on window geometry, with some > > skipping factors they can be eliminated by using properly aligned left > > window border, but with some other AFAICS valid parameter combinations > > stripes persist. And - they seem to depend on lighting conditions... I > > think, I'll try to ask Aptina again... Or does anyone have an idea what I > > might be doing wrong? > > It may be completely unrelated, but we had quite similar problem with > our hardware. With a part of the image "saturated", we had some > artefacts (missing data in fact) on some horizontal lines: pixclk wave > was poor and the i.MX31 could not read data correctly. In order to > resovle this problem, we had to change the bus drivers (we now use some > SN74LVCH16244ADGGR that work well with the 3V3 signals from the camera). > Now even with high contrast and some parts saturated, pix clk looks nice and > we don't loose pixels anymore. Hm interesting. What exactly did those missing pixels look like in your case? In my case these are periodic horizontal lines of 1 or 2 (approx.) pixels wide. Sometimes they are repeated one such stripe every x pixels, sometimes they are repeated in pairs. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
