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oyvindln / vhs-decode

Software defined VHS decoder - Fork (maybe temporary) of the ld-decode Laserdisc rf decoder
GNU General Public License v3.0
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Cross-hatch pattern on strong colors on NTSC VHS output. #63

Open oyvindln opened 1 year ago

oyvindln commented 1 year ago

There is a cross-hatch pattern to varying degrees on the output from NTSC VHS samples which I don't think should be there: https://cdn.discordapp.com/attachments/665834485975351307/1028444042339569754/unknown.png Unlike the "checkerboard"/blocky patterning seen especially on PAL, this is something that has not been spotted on conventional captures. Not sure to what extent it has to do with capture setup, there seem to be some difference between vcrs and setups. Maybe tweaking the filters a bit could help filter it out.

aldude999 commented 3 months ago

I'm seeing this on a JVC HR-S3800U as well: Y+C It's most noticeable with signals that have high chroma, but the noise is in the luma channel: Y Channel C Channel

In scenes with low chroma, like this warning, the noise is almost unnoticeable: Y Channel

It's more noticeable in SP than it is in EP recordings.