H.265 realize the national production of the new standard lead the security will be used to Car DVR
Bonnie Lai
2014-10-20 17:18:47
H.265 realize the national production of the new standard will be used to lead the security Car DVR
Recently, "H.265" became a hot topic in the security sector. H.265 standard has been recognized since 2013, the major companies now publish H.265 products, hot trends exception. The reason, in
In the "HD" to the existing video compression standard has brought a growing stream challenge, although many manufacturers have resorted Shazhao security, but 4K HD struck viciously, even if the existing standard also appears more then how Makeover Fat incompetence
Weili, at this time, H.265 codec development has become more important, I believe that in the near future, support H.265 products will launch a large area, leading security definition monitor.First, the "strongest" video compression standard
H.265 video coding standard called the efficient (High Efficiency Video Coding), but also that HEVC, compared to the previous H.264 standard has improved considerably.
H.265 also why make so many industries favored a plus? The story begins still need to talk about H.264, H.264 also called MPEG- 4AVC (AdvancedVideoCodec, Advanced Video Coding), because you can get a higher standard than other encoding video quality and lower bit rate, and has been recognized by the people, is widely Used in network streaming data, a variety of high-definition television broadcasting and satellite television broadcasting and other fields. From the coding framework for, H.265 still follows the H.264 hybrid coding framework, mainly comprising: frame Prediction (intraprediction), interframe prediction (interprediction), the conversion (transform), quantization (Quantization), deblocking filter (deblockingfilter), entropy coding (entropycoding) and other modules.
Today more clear speech development more strongly, H.264 also encountered a bottleneck. A coding unit for, H.264 each macroblock (marcoblock, MB) are fixed, the size of the image 16x16 Su. However, at higher resolution, the image content information indicates a single macroblock greatly reduced, H.264 macroblock used after integer transform, the low-frequency coefficients of the degree of similarity is greatly improved, a large number of redundancy, Resulting in compression efficiency for high-definition H.264 video encoding significantly reduced; Secondly, H.264 algorithm macroblock number of explosive growth, will lead each coded macroblock prediction mode, motion vectors, and the amount of the reference frame index Of the macro-block level and other parameters of the stream of information takes up more resources, the limited bandwidth allocated to the real residual coefficients describing the image content information is a significant reduction in available bandwidth; Further, due to increased resolution, represent the same The amplitude of movement of the motion vector will also be greatly increased, the characteristics of H.264 encoding is larger the value, the more the number of bits used, therefore, with the sharp increase in the amplitude of the motion vector, H.264 motion vectors used to Prediction and coding compression ratio will gradually decrease.
Compared to H.264, H.265 provides a greater variety of tools to reduce the bit rate. H.265 coding unit can be Choose from the smallest to the largest 8x8 64x64. Macro block is large, less encoded codeword, information and details of the small number of local area (the color did not change significantly, such as gray sky) divided (small Ganglia and more, such as building parts) divided macroblock and a correspondingly more smaller, the encoded codeword is more, this is equivalent to the encoding of the image is focused, and thus reduces the overall bit rate, coding efficiency is A corresponding increase. This process is a bit like "ROI coding" enhanced zoned block more critical for some important details, no more part of the key details of a simple plan block, but this process H.265 can be achieved on adaptive recognition.
Summary discovery, H.265 and H.264 main technical differences are as follows:
Can be seen, H.265 H.264 main change is compared with a quadtree structure of the block division, the use of the adaptive 64x64 ~ 8x8 pixel block division, and the block partition structure based on this collected A series of adaptive prediction and transform coding techniques. In addition, it introduces a new SAO (Sample Adaptive Offset) technology, SAO reference frame is a compensation technique to improve the accuracy of inter prediction. Meanwhile, in the parallel implementation aspects, H.265 also used WPP (Wavefront Parallel Processing) and Tile technology to give full play to the current multi-core parallelism mainstream processor. The application of new technologies, not only to effectively improve the compression performance, but also has a variety of processor-based platform Achieve expansion space efficiency.
Comparative tests have shown that repeated, in the same picture quality as compared to H.264, H.265 coded by size than the video stream H.264 reduced by about 39-44%. Due to different measurement methods for quality control, the data will have a corresponding change. In the current mainstream resolution for example, H.265 at 1080p resolution compared H.264 rate reduced by 40% to 50% lower at 720p compared to 30% to 40%, which means that, 1080p full-time only rate of about 1.5 ~ 2M. Shown in Figure 3, and Fig. The horizontal axis represents the rate, and the vertical axis represents the PSNR (peak signal to noise ratio), image objective quality indicators, each curve for a variety of common video compression standard. In addition, with the upgrading of the resolution, H.265 rate drop Low will be more. Figure 4, for 4K HD test at pedestrians, traffic and other scenes also show, H.265 HD resolution at 4 ultra H.264 is also available to reduce by 50% compared to 60% of the rate.
Seen in this light, both in function and performance, H.265 to H.264 has almost comprehensive progress for the current video compression standard full beyond, which also makes H.265 become the undisputed moment "strongest" video compression technology.
Two, H.265 national production of security applications
As mentioned earlier, security is now more clear walking on the road, H.264 and other standards no longer apply to the rules of a higher security clearance, security needs to have a more efficient compared to H.264 video compression standard to further promote The development of high-definition video, H.265 ready. As a new generation of video compression standard, H.265 is the most obvious feature: compression performance compared to current video compression standard H.264 doubling. When However, the benefits of H.265 is far more clear than 4K monitor so simple, for example, in the peaceful city in hot 1080p full HD surveillance, H.264 1080p standards require more than 4M Rate to ensure image quality, the use of a video compression standard H.265, then only about 1 ~ 2M 1080p stream, and the entire storage pool can be reduced to half of the original, or can be 1-fold more than the original dispatched Above definition point, or can be extended to more than double the storage time.
Here, I am sure you will ask, H.265 could have guaranteed the nationalization of industry applications and video on information security? Due to the special nature of the security industry, which is the most concerned about two aspects of the user.
Let's take a look at the H.265 application to the field of security in all aspects of the role played by the manufacturers can be used to simulate the development and application of the text. Early development of standards is mainly dominated by the JCT-VT, this process A bit like writing a dictionary; then this chip manufacturers use H.265 video compression standard dictionary to a different writing style (chip algorithm), to write an article (compressed stream), which is the layer; to the application Layer, more video surveillance rests in the hands of manufacturers, their role is more collectors H.265 article, after layout, optimized to make all kinds of books (products), product of foreign sales. By ISO ISO and the International Telecommunications Union ITU joint team JCT-VT specified in H.265, a collection of top technology universities, companies, research institutes and other organizations of the Sino-US South Korea and Japan and other countries, it can be regarded as currently defined The most accurate, highest efficiency universal dictionary.
From the industrial chain application layer perspective, H.265 can achieve national production. In the bottom of the application, the domestic part of the solution providers already Lu Continued launched with a considerable part of the core patents H.265 encoding algorithm based on H.265 compression chip, and Huawei and other Chinese companies, is one of the leaders of the standard, Huawei Hass upcoming industry's first one based on H.265 standard definition network camera processor Hi3516A. At the same time, the domestic security vendors are also actively promote the development of H.265 video standard H.265 codec-based programs Equipment being released. Look at H.265 product applications, domestic security manufacturers basically have the product of research and development, including companies such as Hikvision represented manufacturers have launched support H.265 products. So, whether from the chip or to the products, H.265 can be done domestically.
Let's look at the information security industry's most concerned about security issues, which relate to Encrypted data. In the final analysis, data encryption and video compression standard is actually two different aspects of technology. Core video compression standard is less exhausted the amount of data to precisely define the bearer of video information, to improve data compression Performance, data security by encryption to guarantee. This relationship can also use dictionary words to analogy. Using different video compression algorithms, such as the use of different dictionaries to write articles. As long as "standardized" dictionary or Video compression standard for information representation, there must be clearly defined, such as Chinese and English can be read, there is no difference in information security. Write out a text message if you want security, you need to store or transfer Lose, it is encrypted, for example, scrambled transmission channel encryption, data storage set a password, control access and so on. Similarly, video surveillance information is safe or not, depending on the data transmission security systems, authority Management program, password protection methods, regardless of the video compression standard. On encryption and standard levels, the current large domestic security manufacturers basically already have a perfect security encryption strength. For example, the current security thorny available Hot cloud storage technology, the problem is the issue of information security we are most concerned to Haikangwei considered cases, Hikvision provides a reliable cloud storage security encryption protection on many projects are large-scale use. In many flat An city-level projects, data security is the issue of concern, the current mainstream manufacturers are monitoring the development of encryption strength, and this encryption mechanism is also doing quite well.
Three, H.265 lead the new security standards
From the front view of two dimensions, Huawei Hass and other chip companies, Hikvision and other security companies have invested H.265 study, which greatly promoted the H.265 application in the field of security, making H.265 Have a great advantage localization applications. Meanwhile, due to the H.265 standard is gradually developed based on the H.264 standard, backward compatible with H.264, H.264 video applications combine collar Mainstream domain can predict H.265 standard has broad prospects for development in the future.
Imagine, in a very long time in the future, H.265 standard will lead the new mainstream security, the nationalization of the development of H.265 also happens to conform to this trend.