Abstract
Screen content image and video were generated by computer or other digital devices in the real applications such as remote desktop, desktop sharing, video conferencing, and remote education. However, screen content normally contains numerous texts and graphic part which are not appropriate to be encoded by the state-of-the-art image compression standards and intra frame coding in H.264/advanced video coding (AVC). Therefore, in this paper we proposed a new variable length coding in H.264/AVC lossless intra-coding for text part in screen content images or videos. We utilize the characteristics of text blocks to design the new lossless coding method based on context adaptive variable length coding (CAVLC), and determine the block compression mode by rate-distortion optimization (RDO) selector. Experiment results show that, compared to H.264/AVC coding, the proposed method not only reduce the coding bitrates, but also enhance the coding efficiency and visual quality on text content.
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