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Newsgroups: comp.compression
From: "Matt Mahoney" <matmaho...@yahoo.com>
Date: 18 Jun 2005 11:07:58 -0700
Local: Sat, Jun 18 2005 2:07 pm
Subject: Re: new ABO compression
Matt Mahoney wrote: I tested how a naive lossless implementation of ABO would compress a > European patent WO03084205 is surprisingly readable compared to most > patents. > Store two bit planes, one where a bit indicates if the pixel is > Presumably the compression depends on how the bit planes and remaining color image of lena (512 x 512 x 24) and it makes the file larger. In all 3 color planes there are 786,432 8-bit pixel values. Of these, 31,644 are identical to the same color pixel to the left, and of the remaining 38,985 are identical to the pixel below (scanning upwards as in a .bmp file). The horizontal bitplane takes 98,304 bytes. For the vertical bitplane I only counted a bit for the case where there is a horizontal difference (otherwise you are going to take the value to the left anyway). This bitplane takes 94,349 bytes. Finally the 715,803 remaining pixels would take 1 byte each. The total size would be 908,456 bytes. For comparison, the PNG file is 511,988 bytes compressed with Paint Shop Pro 4.0 noninterlaced. The uncompressed .bmp file is 786,486 bytes. Now I know I could be smarter about encoding the bitplanes and -- Matt Mahoney You must Sign in before you can post messages.
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