Thread: RE: [OFF-TOPIC] DC1394 cameras image quality ?
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From: Thierry C. <thi...@la...> - 2000-12-14 08:21:05
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Hi, On my Sony DFW-VL500, I have not notice this impulse noise but I didn't be care to this phenomena. I will have a look and tell you. You can try to take some snaps of a white paper and compute the mean value for each pixel. If this value is the same for each pixel, but the moise remains on each snap, than it is really an imulse noise (strange for a digital camera!!). If some pixels have differents mean values, the moise may come from the ccd matrix. You can also look the yuv 422 format: four pixels are coded with only 2 u values and 2 v values. Try to acquire some images in 160x120 yuv 444. Regards, -- ___________________________ Thierry CHATEAU, Lasmea, UMR 6602 du CNRS 24 Avenue des Landais, 63177 Aubiere, France tel : (33)4-73-40-72-56 http://chateauthierry.multimania.com "Tout ce qui n'est pas donne est perdu". (Hasari Pal, "La cite de la joie") ___________________________ |
From: Damien D. <ddo...@te...> - 2000-12-14 10:42:59
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Hello Jose, Try to set the iris on maximum (4095) and the gain on minimum (0). Then correct the luminance with shutter and exposure. Also, limit the sharpness (e.g. 70) for less impulse noise. If the iris is minimal and the gain at the max you amplify a weakened signal. The inverse setup yields a stronger signal that does not requires amplification. (numbers are for the DFW-VL500 only) Cheers, Damien -- Damien Douxchamps URL : http://www.tele.ucl.ac.be/MEMBERS/Douxchamps_Damien_e.html |