An improved active shape model is proposed in this paper. The proposed algorithm includes the following four aspects. Firstly, this paper adopts a semi-automatic facial feature points marking tool. Secondly, this paper proposes to extract 2D gradient feature on the highest level and the higher level of multi-resolution pyramid images, and use Gabor wavelet transformation to extract the lowest l...

Sarbazi-Azad, Ould-Khaoua, and Mackenzie proved in 2001 that there exists a Hamiltonian cycle in a pyramid network and they also constructed a Hamiltonian path between apex and each of 4 frontiers of a pyramid network. The fault tolerance is a crucial matter for parallel computing, especially in a large network. This work improves Sarbazi-Azad et al.’s result and considers other relative proble...

An irregular pyramid consists of a stack of successively reduced graphs. Each smaller graph is deduced from the preceding one by the contraction or the removal of a set of edges. Using a fixed decimation ratio we need approximatelyO(log(image size)) graphs to encode the whole pyramid. A combinatorial map encodes a planar graph thanks to two permutations encoding the edges and their orientation ...

The implementation of several pyramid methods on programmable graphics processing units (GPUs) in recent years led to additional research interest in pyramid algorithms for real-time computer graphics. Of particular interest are efficient analysis and synthesis filters based on hardware-supported bilinear texture interpolation because they can be used as building blocks for many GPU-based pyram...

Spatial pyramid matching has recently become a promising technique for image classification. Despite its success and popularity, no prior work has tackled the problem of learning the optimal spatial pyramid representation for the given image data and the associated object category. We propose a Multiple Scale Learning (MSL) framework to learn the best weights for each scale in the pyramid. Our ...

The Hough transform is used to detect patterns in images. Its advantage is the ability to detect discontinuous patterns in noisy images. The drawback is its demand for a large amount of computing power. EEcient algorithms and their implementations in multiprocessor systems have been proposed to overcome the computational requirements. The ability to eeciently map two-dimensional (2D) images int...

OBJECTIVE To compare an open vs a closed approach to the nasal pyramid for the initial repair of nasal fractures. METHODS Retrospective medical record review of 49 patients with acute nasal fractures treated by a single surgeon during a 5-year period. Patients underwent a closed approach to the nasal pyramid (Boise elevator only) or an open approach using rhinoplasty techniques, including ras...

Reducing the VLSI layout area of on-chip networks can result in lower costs and better performance. Those layouts that are more compact can result in shorter wires and therefore the signal propagation through the wires will take place in less time. The grid-pyramid network is a generalized pyramid network based on a general 2D Grid structure (such as mesh, torus, hypermesh or WK-recursive mesh)...

Combinatorial Pyramids are defined as a stack of successively reduced combinatorial maps. The Pyramid construction plan defined in TR-63 [7] allows to describe a pyramid by two functions level and state defined respectively on the set of darts of the initial combinatorial map and the set of levels of the pyramid. These two functions encode respectively the maximum level on which a dart survives...