H. 265 coding technology

1. Larger macro block and transform block. Compared with the 4 x 4, 8 x 8, 16 x 16 macro block types of h.264, h. 265 introduces the macro blocks of 32 x 32, 64 x 64 or even 128 x 128, aiming at reducing the number of macro blocks of hd video, reducing the parameter information used to describe the content of macro blocks.

 

2. Use the new MV(motion vector) prediction method. Different from h.264 model of motion vector prediction based on space domain, h. 265 expands more directions for in-frame prediction, and extends the set of prediction blocks from the original spatial domain to the time domain and space-time mixed domain. After calculating the pass rate distortion criterion, the best prediction blocks are selected. Using this method, test in basic mode and obtain an average compression gain of 6.1% with the same quality as h.264, and even increase the compression gain of complex images to 20%.

 

3. Think more about parallel design. At present, the chip architecture has gradually developed from single-core performance to multi-core parallelism. H.265 introduces the parallel computing ideas such as Entropyslice and WPP, and USES the coding algorithm with higher parallelism, which is more conducive to the rapid and efficient industrialization of h. 265 in CPU with very high degree of parallelization such as GPU/DSP/FPGA/ASIC.

 

4. The newly added Tile partitioning mechanism makes the previous coarse-grained data parallelization mechanism with slice, frame or GOP more suitable for parallel implementation on isomorphic multi-core processors. The Dependentslice and WPP mechanism addresses the past

 

The problem that entropy coding cannot be realized in parallel in h. 264 and other coding technologies makes the division of task modules such as DCT, motion estimation, motion compensation and entropy coding more balanced in the whole process of encoding and decoding, and significantly increases the parallel acceleration ratio.

Video compression is an indispensable technology, and its significance need not be stated. When digital TV was first introduced into the UK, it began to use compression technology to provide more channels for viewers. The most popular encoding is h.264, which is used in apple iTunes movies and high definition TVS like Sky and Freeview. However, existing h.264 and mpeg-4 compression schemes gradually began to fail to meet the increasingly large high-definition video stream, so a higher compression rate of HEVC, or h.265, was needed.

 

1. H.265 makes it possible to broadcast hd video on mobile phones

 

Compared with h.264, h.265 only has a 50% bit rate when suppressing 1080p hd video, without affecting clarity. The change may seem innocuous in the age of cable networks, but it is different in the age of networks. The rise of mobile devices such as mobile phones has made a harsh demand for the data volume of streaming video. H.265 can save a lot of space and bandwidth when playing 1080P, 4K and 8K ultra clear movies.

 

Specifically, h.265 analyzes whether there are moving frames in each frame, and then compresses the unchanging parts. If there are more static frames, the compression rate will be higher. Since most parts of video are unchanged at 90%, the compression can guarantee the increase of compression efficiency without reducing the image quality.

 

2. H.265 can instantly double the capacity of blu-ray disc

 

At this year's CES, a number of manufacturers are preparing to launch 4K ultra hd TVS, and the presence of h.265 caters to the needs of ultra hd video. In the mobile market, 3G technology is gradually transiting to 4G. H.265 video can not only improve the quality of network video, but also enable more users to see 1080p video through 4G network using mobile tablets, saving users and operators' traffic. For blu-ray, the HEVC encoding technology of h.265 is enough to compress the huge 4K movie into a blu-ray disc. Although there will be large-capacity blue discs of over 100GB in the future, the use of hevc-encoded blue discs will save more space, and there is no cost to upgrade the optical drive compatible with larger blue discs.

JVT, an international digital video compression standard organization composed of MPEG and VCEG, has launched the planning of the next generation digital video compression standard h.265 in 2005.

 

Bigger macro block and transform block. Compared with the 4 x 4, 8 x 8, 16 x 16 macro block types of h.264, h. 265 introduces the macro blocks of 32 x 32, 64 x 64 or even 128 x 128, aiming at reducing the number of macro blocks of hd video, reducing the parameter information used to describe the content of macro blocks.

 

Use the new MV(motion vector) prediction method. Different from h.264 model of motion vector prediction based on space domain, h. 265 expands more directions for in-frame prediction, and extends the set of prediction blocks from the original spatial domain to the time domain and space-time mixed domain. After calculating the pass rate distortion criterion, the best prediction blocks are selected. Using this method, tests in the basic mode yielded an average compression gain of 6.1% with the same quality as h.264, and even a 20% gain for complex images.

 

Think more about parallel design. Current chip architecture has been gradually from a single-core performance multi-core parallel direction development, h. 265 introduced Entropyslice, WPP (WavefrontParallelProcessing) parallel computing ideas, such as a higher degree of using parallel encoding algorithm, is more advantageous to h. 265 in the GPU/DSP/ASIC/FPGA parallel degree very high CPU fast and efficient in the realization of industrialization.

 

In addition, there are also many highlights in h.265, such as multi-description coding, sampling point adaptive migration, 1/8 pixel interpolation coding, adaptive loop filtering, etc., making h. 265 significantly better than h. 264 in terms of compression efficiency, parallel processing capability and network adaptability.

 

Although h.265 is still in the research stage at present, it is only a matter of time before the launch of h. 265 with the development demand of hd video application field and the development of hardware technology. In the security industry, the application of h. 265 will be very promising. Firstly, the security industry is developing rapidly with the development of the security monitoring system. With the development of the security monitoring system, the pressure of h.264 coding algorithm on storage, network and decoding becomes increasingly obvious. The biggest goal of establishing h. 265 algorithm standard is to improve the efficiency of hd video coding, transmission and decoding, which is very in line with the security development requirements. Secondly, the application of h. 264 algorithm is very popular in the security industry at present, and h. 265 developed from h.264 has great advantages in system compatibility, upgrade and promotion. It is believed that in the near future, h. 265 will replace h.264 as the mainstream technology of video compression in the security industry.

 

At present, h. 264 algorithm has been widely used in the security industry, and h. 265 developed from h.264 has great advantages in system compatibility, upgrade and promotion. It is believed that in the near future, h. 265 will replace h.264 as the mainstream technology of video compression in the security industry.