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Zsolt |
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Thanks! |
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Thanks Zolt.
I think testing the effectiveness of the JPEG compression on an grayscale of the bayer mask should be tested to see how well bayer interpolation holds together, with adjustments made to the compressors parameters. The main parameter to test is the quantisation phase (? I forget, the phase when they divide down the pixels to even them out to make them more compressible). A maximum of 3:1 compression, would probably be best. it would probably be near lossless at the most, and nowhere near as good as a bayer compressor. But ti would be better for existing camera owners. Very simple intra frame compression then could be added, as was being designed elsewhere. Rob, a lot of those drives are power hungry and big, so select carefully. I would like to move in different directions than doing anything camera/codec development related, but I am interested in your bayer footage. if you could post 10 second scenes and bayer format information that would be useful? A simple scene, simple shooting, an complex movement but simple scene, and a complex scene and complex movement. This would provide good test subjects for codec performance. I'm itching, but have too much else I should be doing. |
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Zsolt |
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Zsolt |
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I did a bit of Googling and found this document which states that the FS supports UltraDMA mode 2 (33 MB/s). The bandwidth required for 1280x720, 10 bits @ 24fps is 26.4 MB/second, so it may be possible for the FS to write the raw data to disk with no compression at all, or with only slight compression. |
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Based on all of the above, I expect something around 10MB/s and that requires 3:1 compression ratio. Anyhow, we're going to be on the edge, that's for sure. Zsolt |
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BTW, have you looked at some of the components available on OpenCores such as xmatchpro lossless data compressor or Video compression systems? Thanks! |
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Zsolt |
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Edit -- Andrey mentions using the ETRAX FS in this post and this post and indicates that the CPU should be roughly twice as fast. |
I see that Etrax FS has PCI support built in so, does it mean that you just can connect a PCI board to it or what?
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