Benchmarks: the kodak image set
The kodak image set is a commonly used true color set of images for various testing purpose and benchmarking. The original images can be found in the PNG format at r0k.us/graphics/kodak/. The images are all of 768x512 or 512x768 pixels, and their color depth is of 24 bits per pixel, corresponding to true color.
The images are all photographic type images, and they are all mainly continuos-tone; further, the resolution of all of them is the same, and probably also the source of the images does not vary. This uniformity causes the results of the benchmark to be quite 'flat', as relative results of the comparison of one format gives a little difference between an image an another. PNG images result to be from 20% to 39% bigger than PCIF files. The JP2 files result, instead, from 8% smaller (image 18) to 3% bigger (image 20) of the PCIF format files. The JPEG-LS files produced by the LOCO algorithm are generally slightly smaller than the PCIF files, and their global size is a bit bigger than the one of the Jpeg2000 files.
In the table, the BMP column represents the size of the uncompressed image. The settings used for the creation of the files are described here.
Benchmarks should always be read with care, as results may be different from image to image depending on a great number of factors. Other benchmarks used to test the PCIF format have been done on the waterloo true color image set, on another set of images gathered by the author and on a fourth image set of large images proposed on www.imagecompression.info. Finally, if you are interested in the PCIF algorithm, you are encouraged to test its performances yourself by downloading the program in the download section.
Update: the BCIF algorithm, evolution of the PCIF algorithm, has also been included in the benchamrks. It has a better compression ratio and a strongly inscreased speed. Take a look at the BCIF homepage.
|Filename \ size (KB)||BMP||BCIF||PCIF||JPEG-LS||JPEG2000||PNG|
Below there are the thumbnails of the 24 kodak images linking (externally) to the original images