1. Hash-Based Line-by-Line Template Matching for Lossless Screen Image Coding.
- Author
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Peng, Xiulian and Xu, Jizheng
- Subjects
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TEMPLATE matching (Digital image processing) , *MATCHING theory , *PATTERN recognition systems , *IMAGE transmission , *DATA transmission systems - Abstract
Template matching (TM) was proposed in the literature a decade ago to efficiently remove non-local redundancies within an image without transmitting any overhead of displacement vectors. However, the large computational complexity introduced at both the encoder and the decoder, especially for a large search range, limits its widespread use. This paper proposes a hash-based line-by-line template matching (hLTM) for lossless screen image coding, where the non-local redundancy commonly exists in text and graphics parts. By hash-based search, it can largely reduce the search complexity of template matching without an accuracy degradation. Besides, the line-by-line template matching increases prediction accuracy by using a fine granularity. Experimental results show that the hLTM can significantly reduce both the encoding and decoding complexities by 68 and 23 times, respectively, compared with the traditional TM with a search radius of 128. Moreover, when compared with High Efficiency Video Coding screen content coding test model SCM-1.0, it can largely improve coding efficiency by up to 12.68% bits saving on screen contents with rich texts/graphics. [ABSTRACT FROM PUBLISHER]
- Published
- 2016
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