[Elphel-support] Scanline sequence in compressor

[Andrey Filippov]

Hello Alex,

The data from the senor is stored in the memory line-by-line (normally 8
bits per pixels after scaling and gamma correction, but possible to store
raw - 2 bytes per pixel), each line is padded to multiple of 512. Compressor
reads (regardless of compression mode) overlapping 20x20 tiles, with the
step of 16 pixels. These extra pixels are used in some compression modes,
but not in the monochrome and JP4 variants.
So the memory controller has two modes - writing line by line, reading in
20x20 tiles. The memory controller presents all 400 pixels in a buffer, only
middle 256 are read by the compressor in monochrome mode.

Andrey
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://support.elphel.com/pipermail/support-list_support.elphel.com/attachments/20110127/d8e3665a/attachment-0002.html>