A Novel Rate Control Method for Still Image Coding

The still image coding encoders, such as JPEG image and intra frame in video coding, are highly required a specific frame size control method to support the various application. In this paper, a novel rate control method is proposed to control the frame size for different still image encoders. The gradient-based complexity is considered to construct a general Rate-Quantization (R-Q) model at block level. Then the specific quantization parameters (QP) can be generated for a single frame/image encoding with the R-Q model. Experimental results show that the proposed method achieves up to 94.5% and 99.75% bit match accuracy on JPEG encoder and x264 encoder, respectively.