Mei-Yin Shen

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A new rate control scheme for H.264 video encoding with enhanced rate and distortion models is proposed in this work. Compared with existing H.264 rate control schemes, our scheme has offered several new features. First, the inter-dependency between rate-distortion optimization (RDO) and rate control in H.264 is resolved via quantization parameter(More)
The visual quality of compressed images and video is Low bit rate image/video coding is essential for many visual generally affected by three factors: data source, coding bit communication applications. When bit rates become low, most rates, and compression algorithms. For a given comprescompression algorithms yield visually annoying artifacts that sion(More)
A new blind inverse halftoning algorithm based on a nonlinear ltering technique of low computational complexity and low memory requirement is proposed in this research. It is called blind since we do not require the knowledge of the halftone kernel. The proposed scheme performs nonlinear ltering in conjunction with edge enhancement to improve the quality of(More)
A fast inter-prediction mode decision and motion search algorithm is proposed for the H.264 video coding standard. The multi-resolution motion estimation scheme and an adaptive rate-distortion model are employed with early termination rules to accelerate the search process. With the new algorithm, the amount of computation involved in the motion search can(More)
A quad-tree decomposition approach is proposed for cartoon image compression in this work. The proposed algorithm achieves excellent coding performance by using a unique quad-tree decomposition and shape coding method along with a GIF like color indexing technique to efficiently encode large areas of the same color, which appear in a cartoon-type image(More)
Digital video's increased popularity has been driven to a large extent by a urry of recently proposed international standards (MPEG-1, MPEG-2, H.263, etc.). In order to transmit compressed videos over a communication channel, it is required to control the compression in the encoder such that the output data rate can be t within the channel constraints. The(More)
An image/video registration technique for multiple compressed video inputs such as MPEG sequences is investigated. The proposed technique is based on the matching of discrete cosine transform (DCT) coefficients and motion vectors. First, the I frame of each input sequence is separated into the background and moving objects. For the background, coarse edge(More)
Progressive coding of 3D textured graphic models using a joint mesh-texture optimization technique is investigated in this work. The mesh and texture data of a model are first fed into their respective compression modules to result in a series of levels of details. Then, for a given viewpoint, a rate-distortion surface is generated using these mesh and(More)