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  • The advantages of a new generation of video coding highlighting

        In August 2012, H.265 video codec standard draft was approved by the ITU organizations, sounded the clarion call of the ultra-high-definition era, to lower the cost of the technology, to achieve higher compression ratio (compression rate than H.264 upgrade 30 ~ 50%) and better image quality (up to 7680X4320 resolution images), along with the the H.265 industry chain increasingly mature, video surveillance transition to ultra-high-definition era is just around the corner. Video the HD coding help solve problem, very broad prospects for efficient video encoding technology.
        Highlighting the advantages of the new generation of video coding technology
        In recent years, with the introduction of the H.264 standard, the video obtained a hundred times compression, which makes video content to the network transmission becomes possible, at the same time as the demands for higher image quality, the requirements of video the image reaches 720P/1080P resolution H.264 codec technology to promote high-definition IP video monitoring era soon. The human pursuit of the video image quality is never-ending.
        How to get the most efficient use of transmission bandwidth and storage space? The fundamental solution to the need increased by 30 to 50 percent more than the H.264 video compression video compression code into the hands of H.265 technology, based on the estimated potential investment savings of up to 20%, is very considerable.
        Video image signal space redundancy and time redundancy eliminate this redundancy, lower the threshold for video applications, and enhance the user´s perception of experience, human Expand tireless research and exploration. Codec algorithm complexity, relevant international organizations, in order to ensure the versatility of the encoded image developed video codec based on the latest research results of image coding series standard, ITU-T (ITU) H series image standard (H .261/263/264/265) and Moving Picture Experts Group (MPEG) series of standards (MPEG1/2/4). Reason, the two organizations into the 21st century, the rise of the Internet, the triple play, the tendency for gradual integration of Standards and Technology.
        Trace the origin is the video codec standards, and to promote the video surveillance towards digitization, networking, and will promote the video surveillance business toward high-definition, ultra-high-definition era. Through the course of development of video codec technology innovation, we can insight into the context of the development of video surveillance. In the video uncompressed era, a low-resolution video images require hundreds of megabytes of bandwidth, the digitized media storage and network transmission is simply unrealistic that era, video surveillance, can only exist in analog form. With the launch of the MPEG-1/MPEG-2/MPEG-4 standard, the size of the video a few times the compressed video digital media recording made possible, but still accounts for used large bandwidth video transmission, network transmission is not yet reality.
        Effort to solve the high-definition video encoding problem
        HD IP camera image sharpness been a qualitative leap to HD surveillance system, but also brings a range of practical problems. HD monitor to solve the three core issues: bandwidth issues, display problems, storage problems.
        The bandwidth question: due to the limited network bandwidth, high bit-rate HD video brought its promotion bottleneck. How the highest possible quality video with the lowest possible bit rate transmission is a need to address the most important issue in the high-definition monitor. Due to the heterogeneous nature of the network, the different networks having different channel characteristics at the same time, the different users to enjoy the network bandwidth is not the same, even the same user´s bandwidth may be subject to change. Monitoring developments in the field, the various user terminal has connected to the needs of the surveillance video, such as the LAN monitoring network bandwidth is ideal, users want to view high-quality video; while the field of mobile phone monitoring due to the limited bandwidth, more user-code value is low rate under the video fluency. How to adapt to these different bandwidth environment is also a high-definition monitor equipment problems to be solved.
        Display question: relative to SD video, HD video of the large amount of information as the rich, the appropriate decoding performance requirements also greatly improved, such as the current mainstream PC can easily achieve 8 channel D1 SD video decoding, but if the front end is 1080P HD video, barely decode 1 channel. For large-scale video surveillance platform, Full HD video, the server decodes the pressure will be great.
        Storage problems: image resolution enhancement, will inevitably consume more storage space. 1920 × 1080 @ 30 frames of video, for example, the use of H264 encoding algorithm in order to ensure clarity, the stream to be maintained at more than 6Mbps, approximately 4-8 times the standard-definition video. SD video under the conditions, a 16-channel DVR built-in 8 quick 2T hard to meet the demand for long video storage, while in the high-definition monitor, this time will be greatly shortened, and that will bring increased storage costs. Broad prospects for efficient video encoding technology
        New video encoding technology, future tape can be retrieved automatically and quickly locked the suspect and automatic alarm. Efficient video encoding technology prospects are very bright. Now, many big cities, eager to spend money on camera, PULL rack up monitoring and accompanied by security personnel "squatting" in front of the screen, see the unusual circumstances call report. , That the modern urban camera clouds, one encounters a major case, the transfer of video data to see. But after the incident, the video data is often integrated emergency response no help.
        When designing video encoding, so that the system can data useful initiative information extraction, mining and analysis out, not only to save the the late human input, but also play an emergency role. For example, the detection process, people and cars often elements of concern by the police. By encoding video and automotive recorded clearly, other background blur. Interested in the area marked out in the encoding, monitoring objects and clues locked behind like analysis.
        Currently, after the event of an emergency, the police will normally be the transfer of the surveillance video, manual comparison with the photos of the suspects, solve the case of the conventional techniques. Gao Wen said, the new video coding technology that allows video automatic alarm.
        Face recognition, license plate recognition, crowd density, car accelerated entered into the system once the agreement, it will automatically lock the suspect, no matter where he went, the camera will be real-time notification. This technique can also be used for tracking of subways, airports and other places, face recognition to solve the case on the labor-saving more.
        If a previously without the criminal record of the person committing the crime, state-of-the-art video encoding technology also. As long as a person is abnormal behavior, such as wandering, things picked up repeatedly to go down, look around, the camera will be eyeing the scope of such a search will be greatly reduced. To achieve this, prior to design some of the behavioral model can.
        Video coding technology sounds very professional, but a lot of people´s lives. The Gawain further said coding video compression, transmission to the Internet or digital TV. "A high-definition video share bandwidth 1.5G, and now the family of bandwidth only 1G, simply can not be sent, let alone look at two hundred channels. Encoded video compression twelve times." Gao Wen said, now coding techniques can be compressed to 1/150, a channel bandwidth of 10M suffice.
        Meanwhile, generation of coding technique is the study, is expected to be compressed to 1/300, a channel 5M enough. 20 years later, it may the 1M suffice. At that time, the average family can see more channels, theoretically up to 1000, and can find their own channels, do not wait for someone else to provide.
        In addition, the video encoding technology innovations, the mobile Internet will be greatly affected. Now using a mobile phone to take pictures, shoot video, and if you want to share with others their own transmission in the past accounted for a lot of bandwidth, and monthly packages with several light. But if you use the new encoding technology, the key regions or parts of the image or video to extract and transfer out, you can greatly save traffic.

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