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diff --git a/bayer_jpeg.md b/bayer_jpeg.md new file mode 100644 index 0000000..94f7a6b --- /dev/null +++ b/bayer_jpeg.md @@ -0,0 +1,29 @@ +# BayerJPEG +Th BayerJPEG is a strange format used by the Light L16... *sometimes*. We don't yet know when it switches from it's normal packed 10-bit raw format. + +| size | type | meaning | +| ------- | ------ | ------- | +| 4 bytes | String | Magic Number "BJPG" | +| 4 bytes | u32 | *Format type* <br/> 0: colour <br/> 1: for monochrome | +| 4 bytes | u32 | Length of Jpeg 0 | +| 4 bytes | u32 | Length of Jpeg 1 | +| 4 bytes | u32 | Length of Jpeg 2 | +| 4 bytes | u32 | Length of Jpeg 3 | +| 1552 bytes | | unknown | + +***Monochrome*** +Jpeg0 contains a full resolution grayscale image + +***Colour*** +The bayered image is split across the four Jpeg, one +for each colour location. + +I.E. an image from the ar1335 sensor, color filter bggr, you'd get +- 1 jpeg for the blue channel +- 2 jpeg for each green location +- 1 jpeg for the red channel + +It's not currently known if these are in the order you'd expect. + +***Considerations*** +When the L16 decides to use BayerJPEG, it has to save four copies of each frame. A JPEG is limited to a bit depth of eight, but the sensors output 10-bit data. In order to not loose 75% of the precision, they seemingly divide the image into fours and expect you to sum them later. \ No newline at end of file |