Abstract: In this letter, an efficient algorithm for three-dimensional (3-D) vector radix decimation in frequency is derived for computing the type-III 3-D discrete W transform (DWT). Comparison of the computational complexity with the familiar row-column algorithm shows that the proposed approach reduces significantly the number of arithmetic operations. Moreover, the proposed method has very ...

This paper presents an architecture of the lifting based running 3-D discrete wavelet transform (DWT), which is a powerful image and video compression algorithm. The proposed design is one of the first lifting based complete 3DDWT architectures without group of pictures restriction. The new computing technique based on analysis of lifting signal flow graph minimizes the storage requirement. Thi...

This paper proposes a denoising method for accuracy enhancement of 3D (three dimensional) reconstruction process by shadow moiré. The proposed denoising method based on undecimated wavelet transform (UWT) effectively eliminates noise and grating pattern while retaining useful information. The proposed shadow moiré method is compared with structured lighting method which is a common method for 3...

Ariicial vision systems for mobile robots necessitate sensors and representations that enable a real-time reactive behavior. The log-polar transform has been shown to be a variable resolution scheme that achieves a high compression of the non-foveal part of an image. Such space variant sensors must inevitably be active in order to utilize the high-and homogeneous resolution fovea. We study here...

This correspondence presents a novel matching technique for disparity estimation. The technique combines advantages of an adaptive stripe-based mesh structure and Hough transform. First, a mesh that is composed of triangular patches and ts to the depth changes is generated by using edge maps. In each patch, depth of the scene is approximated by a surface. A search space is built by di erence ma...

In this paper we present an addition to Askey’s scheme of q-hypergeometric orthogonal polynomials involving classes of q-special functions which do not consist of polynomials only. The special functions are q-analogues of the Jacobi and Bessel function. The generalised orthogonality relations and the second order q-difference equations for these families are given. Limit transitions between the...

Robust and reliable edge detection is an important step for accomplishing automatic detection of heart wall boundaries in echocardiograms. We present an edge detection algorithm that makes use of both spatial and temporal information. Our algorithm is comprised of (1) a 3-D discrete dyadic wavelet transform carried out on a sequence of images, (2) edge detection that is carried out by maxima de...