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- Rawzor - 20% to 60% extra lossless compression
on digital camera raw images (nef/orf/raf/cr2/arw/kdc etc...), even if they were already compressed in camera.
- The Image Compression Benchmark - Results for various lossless and
lossy image compression algorithms.
- The New Test Images - A carefully chosen set of high-resolution
high-precision natural images suited for image compression research and
algorithm evaluation. The images historically used for compression
research (lena, barbra, pepper etc...) have outlived their useful life,
they are too
small, come from data sources too old and are available in only 8-bit
precision.
- 64-bit Entropy Coding - The limitations
faced by compression algorithms using arithmetic-coders and range-coders on 32-bit platforms and how
using 64-bit arithmetic can improve compression significantly.
-
64-bit Arithmetic Coding source - 64-bit arithmetic coder based on Mark
Nelson's code (which is based on CACM87 code). Read the above article for how it compares to the 32-bit version.
-
64-bit Range Coding source - 64-bit range coder based on Dmitry Subbotin's
carry-less implementation. Read the above article for how it compares to the 32-bit version.
- Java source code for Range Coder - Java port of Dmitry Subbotin's carry-less Range Coder, using
64-bit precision. The archive contains a generic range coder and decoder, along
with a compressor with byte stream order-zero model implemented as subclasses of Java's I/O
streams.
- The Data Compression News Blog -
I write at c10n on any interesting developments I come across.
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