This paper introduces a new approach to deblocking of JPEG compressed images using overcomplete wavelet representations. By exploiting cross-scale correlations among wavelet co-eecients, edge information in the JPEG compressed images is extracted and protected, while blocky noise in the smooth background regions is smoothed out in the wavelet domain. Compared with the iterative methods reported...

Reducing the required memory bandwidth is a main issue in 3D computer graphics. PN triangle solves the memory bandwidth problem by using curved surface representation and tessellation. It reconstructs a smooth and detailed 3D model from blocky one on graphics hardware and then reduces bandwidth consumption. To implement a simple dedicated hardware executing complex operations of tessellation, w...

We show that combining concepts generally used in covalent organic synthesis such as retrosynthetic analysis and the use of protecting groups, and applying them to the self-assembly of polymeric building blocks in multiple steps, results in a powerful strategy for the self-assembly of dynamic materials with a high level of architectural control. We present a highly efficient synthesis of bifunc...

In this paper, we create synthetic artifacts that are perceived to be predominantly blocky, blurry or noisy. We present them alone or in various combinations and have subjects rate the perceived strength of each artifact and the overall annoyance of the combined artifacts. We found that a simple linear model with no interactions predicted how the perceived artifacts combine to determine overall...

In this paper we introduce a new class of image models, which we call dynamic trees or DTs. A dynamic tree model specifies a prior over a large number of trees, each one of which is a tree-structured belief net (TSBN). Experiments show that DTs are capable of generating images that are less blocky, and the models have better translation invariance properties than a fixed, "balanced" TSBN. We al...

In this paper, we propose a simple and fast post-processing deblocking technique to reduce blocking artifacts. The block-based coded image is first decomposed into several subbands. Only the low frequency subband signals are retained and the high frequency subband signals are discarded. The remaining subband signals are then reconstructed to obtain a less blocky image. The ideas are demonstrate...

The cutting teeth on PDC bits have been working under wear for a long time, but the understanding of their rock breaking mechanism is not deep enough. In this paper, influence key factors such as height, passivation type, invasion depth, lithology, rake angle and tooth diameter load distribution edge, well equivalent plastic strain form section, are investigated by means numerical simulation. r...

Abstract In this paper, a simplified method for predicting rock mass resistance against tensile forces from anchors (anchor) is presented. The interaction of and was investigated using three-dimensional discontinuous numerical modelling. Several patterns discontinuities were assumed in the modelling while single anchor embedded it. results show that existence discontinuity set sub-parallel to s...