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updated the readme

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commit 809db58648f3cc2accaf14e14a1b79f58a1727ea 1 parent 05842ba
@andrewstanfordjason andrewstanfordjason authored
Showing with 13 additions and 4 deletions.
  1. +13 −4 module_jpeg_small/README.rst
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17 module_jpeg_small/README.rst
@@ -15,14 +15,23 @@ Key Features
Functionality:
-* fits in 10Kb
-* handles 4:2:2 chroma subsampling
+* fits in 10KB
+* memory footprint can be pushed down to around 6KB depending on restrictions on input images.
+* handles 422 chroma subsampling.
+* runs in a single thread.
+* 3.6 fps at 480*272 (1.3 MB/s) at quailty 70.
+* currently capped at 7 fps at 480*272 as quality decreases.
+* can be pipelined across threads.
+
+The performance depends on the compression ratio. Performace can be optimised by preprocessing the images to be loaded, i.e. selecting quantization tables.
+
To Do
=====
-* 4:2:1 chroma subsampling
-* 4:1:1 chroma subsampling
+* 421 chroma subsampling
+* 411 chroma subsampling
+* grey scale
* Speed improvements
* Abstract the data I/O to an API.
* Hand coded IDCT
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