Quantcast Noise Generated by VHS Tape - Using Avisynth? - digitalFAQ.com Forums [Archives]
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03-15-2004, 02:13 AM
poerschr poerschr is offline
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I am curious about using two captures and averging the two together to reduce noise (with Avisnyth)...I noticed this topic some time ago on doom9 and on avisynth.org....i was curious if this process could be applied to VHS tapes as well, since it is easy to recapture from a tape...this process only rests upon the idea that the noise generated from a VHS tape is random....if it is not, then it will not work..Does anyone know if the noise is random???
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03-16-2004, 11:47 AM
BobNET BobNET is offline
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Quote:
Originally Posted by poerschr
this process only rests upon the idea that the noise generated from a VHS tape is random....Does anyone know if the noise is random???
I think the noise from storing video on tape and reading it back would be non-random - i.e. it's the same every time you play it. Actually, it probably gets worse over time (old video tape tends to get very blurry).

But the noise from the physical connections (especially composite video cable) should be randomly distributed. This might be a good method to reduce this type of noise (capture several times and blend the results together)...
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03-16-2004, 02:37 PM
incredible incredible is offline
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Right BOBnet as he uses "analogue" signal-ways in his workout he will shurely get some random interferences.

But compared to the main reason for the bad quality on aVHS source, the random interferencies will be very few
And so by this a "random noise" overlay based denoise routine wont give the "wished" result as he will still end up in that blurry and washed video quality and that should be treated using some espec. Chroma based cleaning filters/routines .... and thats source specific.
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