With the increasing demand for flexible and efficient implementation of image and video processing algorithms, there should be a good tradeoff between hardware and software design method. This paper utilized the HW-SW...With the increasing demand for flexible and efficient implementation of image and video processing algorithms, there should be a good tradeoff between hardware and software design method. This paper utilized the HW-SW codesign method to implement the H.264 decoder in an SoC with an ARM core, a multimedia processor and a deblocking filter coprocessor. For the parallel processing features of the multimedia processor, clock cycles of decoding process can be dramatically reduced. And the hardware dedicated deblocking filter coprocessor can improve the efficiency a lot. With maximum clock frequency of 150 MHz, the whole system can achieve real time processing speed and flexibility.展开更多
首先分析了H.264的码率控制算法复杂度高的原因;接着分析MPEG-2 TM5码率控制算法中的虚拟缓冲区机制,并由此得到了一种简单的积分控制算法;最后把这个积分控制算法应用到H.264码率控制算法的宏块层上,提出了一种新的宏块级码率控制算法...首先分析了H.264的码率控制算法复杂度高的原因;接着分析MPEG-2 TM5码率控制算法中的虚拟缓冲区机制,并由此得到了一种简单的积分控制算法;最后把这个积分控制算法应用到H.264码率控制算法的宏块层上,提出了一种新的宏块级码率控制算法.该算法避免了传统码率控制算法与率失真优化技术之间的矛盾.实验结果表明,改进的算法同时适应CBR(Constant Bit Rate)和VBR(Variable Bit Rate)情况.该算法不仅有效降低了原算法的复杂度,使得码率控制更加准确,同时得到的平均PSNR值与原算法基本相同.展开更多
文摘With the increasing demand for flexible and efficient implementation of image and video processing algorithms, there should be a good tradeoff between hardware and software design method. This paper utilized the HW-SW codesign method to implement the H.264 decoder in an SoC with an ARM core, a multimedia processor and a deblocking filter coprocessor. For the parallel processing features of the multimedia processor, clock cycles of decoding process can be dramatically reduced. And the hardware dedicated deblocking filter coprocessor can improve the efficiency a lot. With maximum clock frequency of 150 MHz, the whole system can achieve real time processing speed and flexibility.
文摘首先分析了H.264的码率控制算法复杂度高的原因;接着分析MPEG-2 TM5码率控制算法中的虚拟缓冲区机制,并由此得到了一种简单的积分控制算法;最后把这个积分控制算法应用到H.264码率控制算法的宏块层上,提出了一种新的宏块级码率控制算法.该算法避免了传统码率控制算法与率失真优化技术之间的矛盾.实验结果表明,改进的算法同时适应CBR(Constant Bit Rate)和VBR(Variable Bit Rate)情况.该算法不仅有效降低了原算法的复杂度,使得码率控制更加准确,同时得到的平均PSNR值与原算法基本相同.
