科研之友
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摘要
Current rate control systems use the frame complexity to determine the frame-level bitrates. These methods ignore the dependence between the current frame and its reference frames, degrade the accuracy of their rate distortion models, and reduce the rate control performance as a consequence. In this paper, we propose a general effective rate control system based on matching measurement and inter-rho quantizer (RCMMAIL) for actual video, which includes two phrases: (1) a novel Frame -Level Rate Control algorithm based on Matching Measurement (FRCMM) is proposed to compute the frame-level target bitrates, which measures the frame matching score to characterize the dependency between the current frame and a reference frame. With this quantified dependency, a more accurate rate distortion model is obtained; (2) based on the frame-level target bitrates, a novel inter- rho quantizer is proposed to compute the corresponding quantization parameters for each frame. This quantizer can solve the problem of the uncertain parameters in the current rho model, improving the accuracy and reducing computational complexity simultaneously. Experimental results show that the proposed rate control system achieved better Peak Signal-to-Noise Ratio (PSNR) than other compared models. Meanwhile, the average relative rate control error and time consumption is reduced.
