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TM1300-based video encoding rate control algorithm of the box

Data in the cache is greater than a threshold value, the thread hangs coding; when the cache is less than a threshold amount of data sent from the encoder when to fill code. 5, the test results from the ring system is mainly real-time encoding and decoding test ridicule: The camera will capture the video signal to the codec board, the TM1300 encoded and sent to the communications interface board,[link widoczny dla zalogowanych], and digital signal by the communication interface board from the ring back codec board, the TM1300 decoded in the monitor output. This paper given at 128kbit / s channel rate, set the output frame rate of l1.2 average frame / s. Respectively, H. Verification Model 263 Tmn5, Tmn8 and to test the proposed algorithm, the average output bit rate frame rate control algorithm shown in Table 1. Table 1 The frame rate control algorithm for rate control algorithm of output average output frame rate (frame / s) 11.06.410.7 to better test the performance of the rate control algorithm, this paper, the rate control cache control algorithms were tested, the results shown in Figure 2: (128kbit / s channel rate, using Missa sequence as the input sequence) of various algorithms output rate this article and image quality were compared, the input sequence Missa sequence, the results shown in Figure 3. The results can be seen from the above rate control scheme proposed TMN8 because of its amount of calculation, the processor is not enough computing power, resulting in the output frame rate is much smaller than the set frame rate, therefore not suitable for use in this system. Although the output frame rate control algorithm TMN5 close to the set frame rate, but for the larger movement sequence, the cache filling degree of relatively large amplitude, a larger decline in image quality, not suitable for practical application. The proposed algorithm is able to cache state is relatively stable, relatively TMN8 algorithm proposed method is simple, the results are close, so this algorithm is suitable for practical use. . . 43. . 6 Summary of a communication method Communication Technology students in 2004. Plant, a second foot of l'-. {A?,} F5Mh, one I �� di7 i, -, O'O: uncle D3040 �� 607080gO100 frames Figure 2l28kbit / s channel rates, the rate control algorithm on the cache status of Mexican iguana four hail guard l file ( D Control (Cj network management! 1) International hiding lice Li (a) TMN5 algorithm output (b) TMN8 algorithm output Figure 3 Comparison of image quality, the proposed method takes into account the statistical properties of the image, but also taking into account capacity constraints and the cache minimum delay issues with adaptive capabilities. for image quality considerations, the quantization step QP are the previous frame around the average quantization step change (usually limited), so the cache can maintain relatively stable state . and TMN5, TMN8 control algorithms, more suitable for practical use. In the H.263 video coding standard,[link widoczny dla zalogowanych], there are images in the image layer above the group (GOP) layer, picture layer and macroblock layer between the block group (GOB) layer and the band (Slice) layer, macro block layer below the well block (Block) layer. rate control algorithm can be extended to all levels, and for the characteristics of each layer, according to layers from macro to micro different statistical properties, using the corresponding forward or backward control program, a more detailed and effective rate control, to achieve better image quality. of course, from other considerations, such as the best quantitative | 4] , rate distortion [53. .44. at once l DW helmet files hail Mexico (Fj controlled drug I (O i cover letter with contact hide Portugal Yan Kwong (c) output of this algorithm References l Hu Ming, for remote monitoring video coding box design and implementation, [Dissertation], Nanjing, Nanjing University of Posts and Telecommunications Department of Information Engineering, 20022 Ni strong video surveillance system based on TMl300 rate control and remote device control interface technology,[link widoczny dla zalogowanych], [Dissertation], Nanjing ,[link widoczny dla zalogowanych], Information Engineering, Nanjing University of Posts and Telecommunications, 20023OhH.LeeH .. rate video coding standard rate control method issued on the date of 2004.01.30) at 76543OOOOOO flap warm respect

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