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JPEGs optimization
09-15-2011, 02:49 AM
Post: #5
RE: JPEGs optimization
I believe that jpegmini is not using any optimization of quantization tables + run-length encoding + Huffman encoding, because by using optimized quantization tables alone I get images without visible artifacts and significantly smaller. At best, I believe that jpegmini is only using some smoothing.

To reach this conclusion, I used the following quantization table optimizer: http://pages.cs.wisc.edu/~ratnakar/rdopt.tar.gz

Which is described on this paper: Extending RD-OPT with Global Thresholding for JPEG Optimization

Curiously, the authors of the two papers I mentioned before have published another one where they get a 40-45% file size reduction by using optimization of quantization tables + run-length encoding + arithmetic encoding:

http://ieeexplore.ieee.org/ielx5/5075165/5090078/05090215.pdf?arnumber=5090215

Given that the respective patents are 8 and 6 years old:

I start to wonder if the aforementioned research, funded by public money, will ever be translated on a JPEG compressor for sale on the market using those algorithms.
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Messages In This Thread
JPEGs optimization - lena - 09-03-2011, 08:44 PM
RE: JPEGs optimization - pmeenan - 09-07-2011, 02:21 AM
RE: JPEGs optimization - lena - 09-07-2011, 09:59 PM
RE: JPEGs optimization - pmeenan - 09-08-2011, 12:03 AM
RE: JPEGs optimization - lena - 09-15-2011 02:49 AM
RE: JPEGs optimization - Aaron Kulick - 09-15-2011, 02:56 AM
RE: JPEGs optimization - jarrod1937 - 09-17-2011, 01:45 AM
RE: JPEGs optimization - lena - 12-03-2013, 11:52 PM
RE: JPEGs optimization - jarrod1937 - 12-04-2013, 12:34 AM
RE: JPEGs optimization - pmeenan - 12-04-2013, 12:59 AM
RE: JPEGs optimization - lena - 12-04-2013, 02:42 AM
RE: JPEGs optimization - jarrod1937 - 12-04-2013, 04:29 AM
RE: JPEGs optimization - pmeenan - 12-04-2013, 03:04 AM
RE: JPEGs optimization - lena - 12-04-2013, 08:37 PM
RE: JPEGs optimization - pmeenan - 12-05-2013, 03:15 AM
RE: JPEGs optimization - lena - 12-06-2013, 02:04 AM
RE: JPEGs optimization - iSpeedLink.com - 12-05-2013, 07:17 AM

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