H.265 benefits to security system

1, H.265 technology development

With the continuous improvement of network technology and terminal handling capacity, high-definition field of security has become an inevitable trend, 720P, 1080P video has been widely popular, surveillance has begun to appear even 4K high-definition video, and the resulting growth in video content far much faster than the growth rate of the network, people currently widely used MPEG-2, MPEG-4, H.264 / AVC and put forward new requirements. Hoping to provide high-definition, 3D, mobile wireless applications. In the video experience escalating demand, H.264 / AVC video coding standard also began to show deficiencies in the application of high-resolution video compression, for people on the higher-performance video coding technology have begun to conduct more inquiry.

After several years of development, motion compensation, transform, interpolation and entropy coding technology has been updated research results, the introduction of a new generation of video coding standard already have mature technology base. April 2010, the joint video coding group by ISO / IEC and ITU-T coalition again (JCT-VC) held its first meeting in Dresden, Germany. The meeting identified the name of the new generation of video coding standard: HEVC (High Efficiency Video Coding, high efficiency video coding standard), which is the H.265 video compression standard, the core objective of HEVC / H.265 standard is the H.264 / AVC on the basis of a further doubling compression efficiency.

HEVC / H.265 aimed at resolutions from 320 × 240 to 7680 × 4320 video compression, relative to the previous video compression standards in high-resolution video compression with a good supplement. HEVC / H.265 and MPEG series followed the H.26x joint entropy coding predictive block-based hybrid model, using the new coding basic cell structure, enhanced motion estimation motion compensation strategies and improve accuracy, access than the current H.264 / AVC coding standard higher performance and efficiency. Overall, in terms of coding performance, target HEVC / H.265 is compared with the H.264 / AVC High Profile Level of coding efficiency doubled, that is guaranteed under the premise of the same video quality, bit rate reduced by 50%. A new generation of highly efficient video coding standard HEVC / H.265 features mainly in the following aspects:

1, higher compression efficiency, with respect to the H.264 / AVC's high-grade, HEVC / H.265 video quality in the same case, the bit rate is lower.

2, support for high-resolution, ultra-high resolution video image formats.

3, support the frame rate at 20 to 60 frames / second video codecs, and like H.264 / AVC as flexible, can support up to 172 / second frame rate.

4, support for low-latency encoding mode, all intra-coding mode and a random access coding mode, supports concurrent codecs.

5, has good friendly and strong network network correction recovery, and according to the requirements, a better balance complexity and video quality, compression efficiency, error correction capability and delay other aspects.

2. H.265 core technology

As the next generation video coding standard H.265 coding structure substantially similar to the architecture and H.264. However, compared to H.264, H.265 standard has been a significant change in some way. H.265 key technologies are:

Simple clever coding structure: with respect to the H.264 of 4 × 4,8 × 8,16 × 16 macroblock type, H.265 introduced the 32 × 32,64 × 64 and even 128 × 128 macroblock aim reduce the number of high-definition digital video macroblock to reduce block is used to describe the contents of the macro parameter information, in order to compress high-resolution video. Meanwhile, in order to significantly improve the coding efficiency, the use of a more flexible coding structure, including conversion unit (Transform Unit), predicting unit (Predict Unit) and a coding unit (Coding Unit). Separated from each other between the three units, making conversion, processing link between prediction and coding is more flexible and convenient, but also to enable each unit to better do their tasks.

Simple clever block structure RQT: RQT as an adaptable conversion technology, to promote and extend this concept to the development of the H.264 standard ABT (Adaptive Block-size Transform) technology. For inter-coding, it can follow the motion compensation block size related to the size of the transform block adaptively adjusted; and for intra-coded, it can be based on characteristics of the intra prediction residual transform block associated resize adaptive. Larger block transform with respect to smaller block transform, one can better focus the energy, and, after quantization can leave more image details, H.265 based on characteristics of the current block signals, the block size can transform adaptive selection.

Use the new MV (motion vector) estimation method. Different H.264 intra-prediction mode based on the motion vector prediction spatial domain, H.265 to expand more and more direction, while the prediction block from the original set of spatial domain extended to the time domain and mixed-domain space-time, the pass rate After selecting the best prediction block distortion calculation guidelines. Using this method, in the basic mode test, in the case of the same quality with H.264, an average of 6.1% compression gain, complex image compression gain even up to 20%.

More consideration parallel design. The current chip architecture has been gradually towards multi-core parallel direction from a single-core performance, H.265 introduced the Entropy slice, WPP (Wavefront Parallel Processing) parallel computing and other ideas, use a higher degree of parallelism coding algorithm, more conducive to H.265 in GPU / DSP / FPGA / ASIC and so a very high degree of parallelism in the CPU fast and efficient industrialization.

In addition, H.265 there as multiple description coding, adaptive sampling point shift, 1/8 pixel interpolation encoding, adaptive loop filter, and many technical highlights, so H.265 compression efficiency, parallel processing capabilities and aspect ratio H.264 network adaptability great progress.

3. H.265 security industry to bring new opportunities

Currently, some of the world major codec equipment vendors have been actively involved in research among the H.265 standard. Qualcomm is one of promoters of H. 265 standard, the MWC conference in Barcelona on Qualcomm demonstrated the next-generation H.264 video coding standard H.265 successor of the effect. Qualcomm H.265 video presentation with a comparison of the source object is H.264, the current in the PSNR objective evaluation of the most widely used standard similar situations (H.265 is 39.72, H.264 is 39.65, with a resolution to 800 * 480), H.265 video bit rates 610kbps, the file size 3.10MB; and H. 264 video bit rate reached 1183 kbps, the file size is also 6.01MB. From Qualcomm staff presentation, H.265 standard H.264 standard comparable savings of 40% to 45% of the rate. Recently, the Japanese broadcasting company NHK, Mitsubishi Electric has announced that it has successfully developed the world's first ultra-high-definition video for 8K H.265 format in real-time hardware encoder, the recorded video resolution up to 1080p, sixteen times.

At the same time, China's security companies are actively promoting the development of H. 265 video standards. Solutions provider has launched the H.265 encoding algorithm based compression chip, several security companies have been timely follow-up program based on H.265 codec equipment has been put on the market. From the market performance, H.265 technology to the security industry has brought many new opportunities.

More economical: H.265 technology in bitrate depth optimization, the same quality, can be compared to H. 264 save nearly 50% rate, which would greatly reduce storage costs. Let's compare the H.264 and H.265 1080P video BLK month's storage costs to 4M bit rate H.264's an example:

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For the 100-channel video, H265 H.264 less than about 62T disk space to 4T hard disk, for example, can save an average of 15.5 hard drive, or about 1.5 million, the cost advantage is obvious.

Clearer: the field of security has become an inevitable trend HD, 720P, 1080P video has been widely popular, and 4K, 8K ultra-clear video has begun to emerge. High-resolution video information to bring growth to grow faster than the network bandwidth. H.265 coding can compensate for network bandwidth limitations, allowing easy transfer of ultra-clear video, under the same conditions of bandwidth, H.265 can enhance the quality of the original 50%, enhancing the user's visual experience.

Smarter: supports H.265 codec chip is more powerful than traditional monitoring chip, based on these chips can expand more intelligent analysis applications. Albert world launched in H265 300W pixel camera, for example, the internal integration of the mix line, perimeter, articles legacy value post, face detection, crowd, audio and video and other abnormal diagnostic intelligent analysis algorithm, H.265 + intelligent analysis let your monitoring easier.

4. Conclusion

H.265 with its higher compression ratio, faster processing speeds, better adaptability and robustness, security surveillance in the rapid development and promotion, we believe that in the near future, H.265 will be able to its advanced technology to the security industry to bring more new opportunities.