Dynamic code rate allocation method based on video data importance in wideband clustered system

Abstract

The invention provides a dynamic code rate allocation method based on video data importance in a wideband clustered system. The dynamic code rate allocation method comprises the steps as follows: a channel feedback module detects the channel condition and estimates a channel transmission code rate and a video coding rate; a transmission module divides to-be-transmitted video data output through source coding into a key frame and a non-key frame, preferentially ensures transmission of key frame data via the estimated channel transmission code rate, and stops transmission of non-key frame data when the channel transmission capability is insufficient. The dynamic code rate allocation method provided by the invention has the superior effects that when the channel transmission condition is worse, the coding rate is controlled by a fixed code rate to perform code rate allocation for an area of interest preferentially, and different quantification parameters are adopted for the area of interest and a common area, so that preferential coding of an important video frame is ensured; meanwhile, the transmission module divides the video frame into a key frame and a non-key frame, and performs preferential transmission on the important video key frame preferentially, so that transmission of important video data is ensured.

Description

technical field [0001] The invention relates to the technical field of trunking communication systems, in particular to a dynamic code rate allocation method based on the importance of video data in a broadband trunking system. Background technique [0002] With the broadband development of the trunking wireless system, the trunking wireless system can not only provide voice and short data functions, but also provide video functions, especially the transmission of real-time video can provide users with a more intuitive and rich interactive experience. Therefore, trunking Wireless systems are widely used in public safety, transportation, emergency communications, and command and dispatch. Since the transmission bandwidth of the trunking system is small and not stable enough, and is easily affected by time variation, attenuation and interference, how to ensure the quality of video coding and transmission when the channel bandwidth changes dynamically becomes an urgent problem ...

AI Technical Summary

Problems solved by technology

[0004] like figure 2 As shown, if the system in the prior art encounters a drop in channel bandwidth during the transmission process, video data will be lost, and the encoded data cannot be transmitted to the receiving end in a timely and accurate manner, causing the received video to fail to play normally.

[0005] To sum up, the existing trunking wireless system has the following defects: first, video source coding and channel state are independent of each other, and when the channel transmission capacity is insufficient, the bit error rate is high, and the reliable transmission of video images cannot be guaranteed; second, the trunking system The main users of , such as users in the public security industry, require to be able to see the key details in the video image, so as to obtain clues and evidence information, but there are no corresponding measures to guarantee it in the existing system; third, for video data, Different coded frames have different importance to the reconstruction of video images. When the channel transmission bandwidth is insufficient, the data loss of key coded frames will be serious, which will cause the received video data to be unable to be decoded and played normally.

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