Narrow Results

In this paper, we present an efficient biorthogonal wavelet construction for the ternary Loop subdivision based on the lifting scheme, and give the corresponding decomposition and reconstruction formulas. We apply the proposed algorithm to the progressive transmission and the denoising of 3D graphics, and show its sufficient stability and good performance by some numerical experiments. Since the usual input mesh does not possess the property of subdivision connectivity, while the multiresolution analysis based on subdivision surface requires the processed initial mesh to be semi-regular, we further propose a new rapid algorithm of constructing the initial mesh which not only possesses ternary subdivision connectivity but also approximates the given input mesh.

Content adaptive viewer for the delivery of multimedia data such as text, images, audio, and video has been extensively studied in recent years. In contrast, techniques for adaptive rendering of 3D models in clients with different rendering capabilities and network connections are just beginning to emerge. In this paper, a novel viewer for networked 3D content is presented, which is designed and implemented in model-view-controller pattern framework. At the client end the 3D stream is progressively decoded up to the “best” level-of-details as defined by the client computational resources and the user inclination.

This paper presents an efficient dynamic regions of interest (ROIs) transcoding scheme for JPEG2000. ROIs transcoding technique is specially value for image transmission with JPEG2000 through narrowband networks. Based on embedded block coding with optimal truncation (EBCOT), we obtain the original bitstream for the ROIs transcoding. Then, we can reorganize it without any re-encoding by using the empty packet property and Layer-Resolution-Component-Position (LRCP) progression of JPEG2000. The proposed scheme can effectively satisfy the user's needs of the dynamic definition as well as prioritization of new and existing ROIs quickly at any time during image transmission. Experimental results show that the scheme is not only highly flexible in the progressive transmission of JPEG2000 images, but also fast and easy to implement. Moreover, the proposed algorithm is fully compatible with the JPEG2000 image-coding standard, so it is also suitable for lossless transcoding of ROIs only or of the entire image.