H.264 FRExt technology and its application
1. Introduction
In July 2004, JVT completed the development of the extension part (Amendment) of H.264FRExt (ie: FidelityRangeExtensions), including High profile (HP), High 10 profile (Hi10P), High 4: 2: 2 profile (Hi422P ), High 4: 4: 4 profile (Hi444P) 4 profiles. In addition, JVT started the standard formulation of a layered coding SVC for a new extension of H.264 in January 2005 and plans to complete it by the end of 2006. This article mainly introduces the main technical points and their application in H.264 FRExt.
The international video coding standard H.264 with the best coding performance is developed by the working group JVT jointly established by the MPEG standard group under ISO / IEC and the VCEG standard group under ITU-TSG16. ITU calls it H.264, MPEG is called MPEG-4Part10, and it can also be called AVC, H.26L, JVT standards. JVT completed the standard formulation of the basic part of H.264 in May 2003, including Baselineprofile, Extended profile and Main profile, including different encoding tools, as shown in Table 1.
2. Technical characteristics of FRExt
1.FRExt4 profiles
H.264Baselineprofile, Extendedprofile and Main profile are all 8-bit sample data and 4: 2: 0 format video sequences. FRExt extends it to 8-12 bit sample data. The video format can be 4: 2: 0, 4: 2: 2, 4: 4: 4, set up 4 profiles: High profile (HP), High 10 profile (Hi10P), High 4: 2: 2 profile (Hi422P), High 4: 4: 4 profile (Hi444P), These 4 profiles are all based on the Main profile, and are gradually expanding the inclusion relationship. The coding tools and interrelationships contained in them are shown in Table 2.
2. Transformation method
Since FRExt targets high-resolution video images, in order to obtain better coding efficiency, an integer 8% 8 transform method is added to FRExt, and the transform matrix is:
The calculation accuracy is (8 + n) bits, where the input video samples are n-bit precision. This transformation method can be realized quickly by the butterfly method, and its calculation complexity is slightly more than that of the 4% 4 transformation method in H.264, as shown in Table 3.
In the encoding process, the MB encoder chooses whether to use 4% 4 transform or 8% 8 transform for each macroblock. However, for inter-frame macroblocks, if the 8% 8 subdivision method is used (that is, 4% 8, 8% 4. 4% 4 mode), the luminance component adopts the 4% 4 transformation method; and for intra-macroblocks, if the luminance component adopts the 8% 8 prediction method, the luminance component adopts the 8% 8 transformation method.
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