Hi,
I am trying to save some of my old HI8 Camcorder movies to DVD. Some of the tapes appear in rather poor shape and show bright horizontal lines that flicker across the image (see enclosed sample). Those lines are present on the camcorder screen so they are not an artefact of the digitization. The tapes are about 10 years old and high quality Metal Particle HI8 tapes. Same camcorder as recorded:
Questions:
1) What causes this noise
2) Any suggestions how to get rid of it. I have played around with some Virtualdub filters but I'm not an expert and the number of possiblities seem endless.
I'd appreciate any help preserving those memories.
Thanks much
Axel
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The cause is tape dropouts. Hi8 tape particularly ME tape had dropout issues where magnetic holes appear in the tape from wear or aging.
Solutions
First try head cleaning. A digital dropout compensator device detects dropouts from low tape playback modulation. The device will copy video pixels from the lines above and below to fill the hole. A quality video dub house will have this equipment. It may be a function of their Hi8 playback deck, TBC or Framestore.
There may be a software denoise application that does something similar.Recommends: Kiva.org - Loans that change lives.
http://www.kiva.org/about -
Thanks for everybodies advice. I have called around locally (Seattle) and haven't found anybody willing to take this on. I've played around with some of the filters without much luck. It occurred to me that these "drop outs" occur at different locations in the image in each frame . They are most often the brightest spot in the frame. Wouldn't it be possible to simply identify these spots by their brightness (some threshold) and replace them with and interpolated value from the previous and following frame? Or a filter that selects replaces the frame with the minum of two adjacent frames. Is this naive? I tried the frame merging filter which helps but since it seems to average the frames it doesn't really remove those lines. Is there an existing filter (combination) that could be configured to do that job?
Thanks much
Axel
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