Analysis and Hardware Architecture Design of Global Motion Estimation
Journal of Signal Processing Systems
Super-resolution sprite with foreground removal
ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
High-resolution multi-sprite generation for background sprite coding
ACIVS'07 Proceedings of the 9th international conference on Advanced concepts for intelligent vision systems
Tennis Video 2.0: A new presentation of sports videos with content separation and rendering
Journal of Visual Communication and Image Representation
Sprite generation using sprite fusion
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)
Synthetic Video Generation for Evaluation of Sprite Generation
International Journal of Multimedia Data Engineering & Management
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An efficient static sprite-generation and compression scheme is proposed for background video coding. First, considering both short- and long-term motion influences, a hybrid technique is proposed in the sprite generation to search the background motion relative to the generated sprite image. In order to prevent the sprite image from being blurred due to the inaccurate segmentation, a reliability-based blending technique is developed. Both the background video at every frame and the sprite image are categorized into reliable, unreliable, and undefined regions. Each region uses a unique strategy in blending. This makes the proposed technique work well even in the case of coarse segmentation. Second, an arbitrary-shape spatial prediction technique is proposed to efficiently compress the sprite image. Due to the property of the background video object, the sprite image often contains many flat and texture-correlation regions. Therefore, utilizing directional spatial prediction can significantly improve the efficiency of sprite coding. In general, the generated sprite is not a rectangular image. Since traditional spatial-prediction methods have difficulty in handling those contour blocks, a padding technique derived from rate-distortion optimization is proposed. Experimental results show that the proposed scheme can generate the background sprite image with better visual quality. Compared with the MPEG-4 sprite-coding scheme, it can also significantly improve the coding efficiency up to 3.0 dB at low bit rates.