The H.264 standard is all "H.264 / MPEG-4 Part 10", which is a new standard established by Joint Video Team, JVT, established by ITU-T and ISO / IEC. H.264 is still using a hybrid encoding scheme for combining transformations, in order to obtain higher video compression encoding performance and wider applicability under the same encoding frame, H.264 standard introduces many new technologies, such as 1/4, 1/8 pixel precision motion estimation, inter prediction of multi-reference frames, intra prediction, loop filtering, and adaptive arithmetic coding, etc. H.264 Video coding standard has a significant increase in coding quality and compression than the original video coding standards.
In the same visual sensing quality, the encoding efficiency is 50% higher than the previous coding method. H.264 Code performance beyond previous video coding standards, with good application prospects, a large number of applications to video compression and video surveillance.
At present, the research of H.264 codec standards is mainly divided into algorithm research and hardware implementation two categories, hardware implementation programs are mainly divided into three types:
(1) Scheme based on the PC platform. This solution is pure software to achieve codec, utilizing multimedia instructions such as MMX and SSE / SSE2 to optimize the program, with low development cost and short cycle short. The CPU architecture of the PC is not suitable for processing digital signals, so the effective utilization rate of the CPU is relatively low.
(2) Pure hardware scheme based on ASIC chip. This scenario cures the video coding algorithm into hardware, has the advantages such as high integration, short development cycle, but dedicated is relatively strong, and the product is not easy to upgrade. At present, H.264's codec chip has appeared, such as Fujitsu's MB86H51, Hisilcon's GoaltMhi3510 and JVC's Jcy0237 LSI, etc.
(3) Software and hardware binding scheme based on DSP. This scheme uses DSP chips and other peripheral chips to form a processing system, which has the advantages of high development flexibility, strong processing capability, low development cycle, low power consumption and easy upgrade. As the DSP cost-effective increase, the program has become an ideal solution for the current H.264 encoder hardware.
The H.264 codec standard has high compression ratio, wide adaptability, high fault tolerance and high image recovery quality, and has good application prospects in real-time systems. TMS320DM642 is a digital multimedia processing chip applied to video and image processing fields in TI. It has the advantages of high processing ability and high integration, and is an ideal chip that implements H.264 video encoders. Many domestic and foreign companies have developed or have developed a DM642 development video surveillance system.
1 X.264 Encoder Transplant
X.264 is initiated by the Center Research Institute of the Paris Center in Paris, in June 2004. Projects with many video enthusiasts, focusing on effectiveness, strive to reduce the calculation of coding without significantly reducing coding performance Complexity, abandon some of the time-consuming relatively larger time-consuming relatively large but impact on performance, such as multi-reference frames, unnecessary block patterns in inter prediction, Cabac, etc. The X.264 encoder uses the multimedia hardware acceleration instruction based on the X86 architecture such as MMX / SSE / SSE2. The associated X86 command is needed, streamlined the partial function, making its structure easily executing on the DSP. Simple transplantation X.264 encoder, the encoded efficiency on the DM642 platform is extremely low, Table 1 shows the results of the X.264 encoder after transplantation results on the DM642 platform.
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As can be seen from the results, the encoding efficiency of X.264 after transplantation is very low, and can only achieve an average of 0.6 f / s coding rate, and it is necessary to further optimize the characteristics of the X.264 encoder and DM642. Improve coding efficiency. Technology area
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