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MSU JPEG 2000 Image Codecs Comparison

MSU Graphics & Media Lab (Video Group)

Project head: Dr. Dmitriy Vatolin
Measuring: Alexey Moskvin
Refinement, translation: Oleg Petrov
Verification: Artem Titarenko


About comparison


Tested codecs:

Download MSU JPEG 2000 Image Codecs Comparison (27 pages in PDF, 2.01 MB)

Nine codecs have been tested on four images with six compression rates, 216 resulting images.


Goal of JPEG 2000 codecs testing


JPEG 2000 is a new format for image compression. It was developed to replace popular JPEG format and has a lot of advantages: higher compression ratios are available, lossless mode, progressive downloads, error correction, etc.. The main goal of this testing was the comparison of compression quality of available JPEG 2000 codecs: is there any significant difference between implementations of this standard?

Main comparison parts:

  1. Y-PSNR comparison.
  2. Visual comparison.
  3. Informal comparison.


PSNR comparison


PSNR is a metric used to compare two pictures: the more per pixel difference between the pictures is the less is PSNR value. So the higher is the codec's line on the graph the better is the compression quality.

PSNR was measured using MSU Video Quality Measurement Tool.

Y-PSNR is the difference in brightness component. One JPEG codec is also plotted on graphs. On the following graph one can see that JPEG is far behind the JPEG 2000.
Warning: this is only one of eight graphs from our comparison! All of them can be found in the PDF with comparison.

ACDSee
Barbara image, Y-PSNR


Visual codec comparison


In most cases the PSNR value is in accordance with the compression quality. But sometimes this metric does not reflect presence of some important visual artifacts. For example, we can't estimate the quality of the blurring artifacts compensation performed by some codec using only PSNR metric. Also in some cases it is difficult to say whether 2 dB difference is significant or not.

That is why in addition to PSNR graphs we use visual comparison of images compressed by different codecs.

ACDSee
ACDSee 7.0, 18324 bytes
Photoshop CS2
Photoshop CS2 plug-in 1.6, 18669 bytes
On these images one can easily see that on this test picture Photoshop CS produces more artifacts than ACDSee.
There are samples of images compressed by every codec in PDF with comparison.


Download


Call for codecs 2013
See all MSU Video Codec Comparisons

MSU video codecs comparisons resources:

e-mail: 


Other resources


Video resources:

Fifth Report on S3D quality assessment (5 films) is released!
Appendix to Eighth MSU .264 codec comparison is released

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Last updated: 10-March-2011

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Project sponsored by YUVsoft Corp.

Project supported by MSU Graphics & Media Lab

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