Difference between revisions of "Indeo 3"
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Indeo Video 3 employs [[Subsampling|color subsampling]], [[Differential_Coding|differential coding]], [[Vector_Quantization|vector quantization]], [[Run_Length_Encoding|run-lenght coding]] and [[Motion_Compensation|motion compensation]] to achieve its compression.
Revision as of 11:32, 23 July 2009
- FourCC: IV31, IV32
- Company: Intel, Ligos
- Technical Description: http://www.csse.monash.edu.au/~timf/videocodec/indeo3.txt (mirrored)
- Samples: http://samples.mplayerhq.hu/V-codecs/IV32/
- Partial specification: http://multimedia.cx/mirror/5386232.pdf
Indeo Video 3 is a proprietary video compression algorithm developed by Intel. It is primarily used to encode video in AVI files. The format was commonly seen around the time of 1996 and has since been superseded by Indeo Video Interactive version 4 and 5 (see Indeo 4 and Indeo 5). There are many versions of this codec (R3.1, R3.2) but the version R3.2 (FOURCC 'IV32') is the most common. There is a support for this codec for all major platforms (Windows, Macintosh, Linux).
This document focuses on principles necessary to implement an Indeo Video 3 decoder.
Internal pixel format
Indeo Video 3 operates completely in the YUV color space. It uses a special downsampled case of the YVU 4:1:0 format where pixel are represented using only 7 bits. The downsampling is done in the encoder by applying the right shifting on pixel values after color conversion and subsampling. Thus, both encoder and decoder operate internally on pixel values in the range of 0-127. This was done in order to permit the pseudo-SIMD processing. Additionaly the upsampling is needed in the decoder. After each plane was decoded, the pixel values shall be shifted one bit left to convert them back to 8-bit values.