The C6711 Low Bit Rate Control Of Video Coding And Optimized

This thesis proposed the realization and optimization of low bit-rate monitor video encoding application in C6711 DSP. The output bit-rate is between 9. Bkpbs and 112kbps, typically 44kbps.Firstly, based on the C6711 DSP hardware characteristics, H. 263 was chosen as the core video compression framework. After seven advanced options of H. 263 was tested, we analyzed the test results and used three options which are unlimited motion vector, advanced motion prediction and deblock filter as the scheme of the low bit-rate monitor video encoding. Consoidering the low bit-rate video encoding characteristics, background block search algorithm, which is based on Diamond search algorithm was used to improve the motion estimation speed. And detection of All-Zero block algorithm was chosen for the reason of static background sence in minotor video encoding application.Secondly, We optimized the encoding application in C6711 DSP embedded platform. The application optimization in DSP embedded system was mainly based on the three sides: application architecture, function assembly codes and bus operations. After the optimization, the application not only meet with the requirements of the monitor system, but also make a good preparation for the system update in the future. Besides C6711 DSP, the monitor system included video capture module, UART output module and FLASH module. We set interrupt table vectors and finished the corresponding interrupt funcionts to integrate video capture module and UART output module. Flash boot program was used to boot DSP system from Flash ROM.Lastly, we realized the client applicaiont and the super-resolution algorithm. We proposed a method combining wavelet transform and bilinear interpolation in the super-resolution algorithm. This method did the resolution improvement in the wavelet frequency domain and obtained good time efficiency and visual effect.