Dr. Tony Lin Profile

Dr. Tony Lin

at Peking Univ

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Proceedings Article | 18 January 2004 Paper

Hybrid image coding for real-time computer screen video transmission

Tony Lin, Peng-Wei Hao, Chao Xu, Ju-Fu Feng

Proceedings Volume 5308, (2004) https://doi.org/10.1117/12.526055

KEYWORDS: Image compression, Visualization, Computer programming, Video, Algorithms, Image quality, Image segmentation, Video coding, Binary data, Visual compression

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In this paper, we present a novel hybrid image coding scheme for real-time applications of computer screen video transmission. Based on the Mixed Raster Content (MRC) multilayer imaging model, the background picture is compressed with lossy JPEG, and the foreground layer consisting of text and graphics is compressed with a block-based lossless coding algorithm, which integrates shape-based coding, palette-based coding, palette reuse, and LZW algorithm. The key technique is to extract text and graphics from background pictures accurately and with low complexity. Shape primitives, such as lines, rectangles, and isolated pixels with prominent colors, are found to be significant clues for textual and graphical contents. The shape-based coding in our lossless algorithm provides intelligence to extract the computer-generated text and graphics elegantly and easily. Experimental results demonstrate the efficiency and low complexity of our proposed hybrid image coding scheme.

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