ENC series H265 encoder product technology highlights
1.Coding technology based on visual perception (Perceptual Encoding)
Human Visual System HVS Is one of the main means for people to obtain external information.
HVS can perceive primary visual information such as brightness, color, texture, direction, spatial frequency and motion in video scene.Visual neuroscientists have conducted extensive research on the visual perception mechanism of HVS, and visual neuroscience is one of the most in-depth research areas in brain science.Since people are the main receiving source of video information, the coding effect and computational efficiency of video coding can be improved by using the principle of visual perception.The traditional video coding algorithm does not distinguish the importance of each region in the image in the visual sense when the video image is compressed. In the allocation of bit resources and computational resources, the difference of video scene perception by HVS is not considered.However, the perception of video scene by HVS is selective. Different regions or objects have different visual importance, and HVS is also sensitive to various distortions in different visual signals.These features of HVS can guide the video encoder to allocate more efficient bit resources and computational resources.ENC H265 hardware video encoder new generation HEVC/ h. 265+ coding engine algorithm USES multiple dimensions of visual perception such as brightness, color, texture, direction, spatial frequency and motion, etc., greatly improving the encoding compression efficiency.
2.Advanced reference frame adaptive technology (Advanced Referencing)
Monitoring scenario, most of the pictures for still images or large area still picture, carrying too much useless information, hybrid coding framework, based on prediction and transform can reference frame is used to effectively reduce the transmission of useless information, but passing reference frame refresh cycle nearly, effect is limited, and AR technology, in particular scene images under the condition of no change for a long time, using adaptive GOP reference frame can be use for a long time, can significantly improve the image quality/lower code rate.The new generation of video encoder HEVC/ h. 265+ adopts forward B frame technology to improve the compression rate without increasing the system delay.
3.Advanced rate control technology(RC)
The new-generation HEVC/ h. 265+ RC multi-mode bitrate control based on visual perception, including frame-level, line-level and cu-level, is accurate and fast, greatly improving the subjective feeling.
In many areas of different quality demand scenarios, such as low storage area on the top shelf quality requirements, need for corridor handling process requires high, ROI (interested area code) can be divided into many areas of different bit rate, frame rate and image quality separately adjustment, and IVE (video intelligent analysis engine) linkage can effectively reduce the coding bit rate.
Periodic intra refresh technology, such as special transmission channel (3G, LTE, etc.) for aerial photo transmission, is optimized to bipartition the transmission of I frame for many times to reduce network jitter, make the code stream smoother and more stable, and improve the network adaptability.
According to the optimization of ENC’s new generation HEVC/ h. 265+ coding engine for many aspects of the monitoring industry, the compression rate of HEVC/ h. 265 encoder in most scenes is 30% to 50% higher than that of AVC/ h. 264 encoder, and the compression rate of typical monitoring scenes can be improved by 50% to 70% based on HEVC/ h. 265’s proprietary advanced reference frame adaptive technology.
Therefore, we have reason to believe that ENC’s new generation HEVC/ h. 265+, with its superior compression rate and improvement and optimization for the characteristics of the streaming media industry, will be able to rapidly scale commercial use and form another industrial innovation, and which customer enterprises will seize this opportunity to stand out, let’s wait and see.