SAR phase history data represents a polar array in the Fourier space of a scene being imaged. Polar Format processing is about reformatting the collected SAR data to a Cartesian data location array for efficient processing and image formation. In a real-time system, this reformatting or “re-gridding” operation is the most processing intensive, consuming the majority of the processing time; it a...

Fetal heart monitoring yields vital information about the fetus health and can support medical decision making in critical situations. A compound signal is obtained non-invasively by placing electrodes on the abdomen area of the mother which contains maternal and fetal ECG signals contaminated by various other signals from body and externally induced noises. The Polynomial Networks technique ha...

Cyclic prefix based equalizers are widely used for high-speed data transmission over frequency selective channels. Their use in conjunction with DFT filterbanks is especially attractive, given the low complexity of implementation. Some examples include the DFT-based DMT systems. In this paper we consider a general cyclic prefix based system for communication and show that the equalization perfo...

In the framework of computer-assisted diagnosis, pulmonary airway investigation based on multi detector computed tomography (MDCT) requires to provide radiologists and clinicians with advanced tools for interactive exploration, quantitative assessment and follow-up. This paper develops a set of automated investigation facilities relying on 3D airway reconstruction, enhanced central axis-based d...

The skeleton is an essential shape descriptor providing a compact representation of a shape that can be used in the context of real object recognition. However, due to the discretization, the required properties to use it for graph matching (homotopy to the shape, consequently connectivity, thinness, robustness to noise) may be difficult to obtain simultaneously. In this paper, we propose a new...

This paper investigates the emerging notion of multiwavelets in the context of multirate filter banks, and applies a multiwavelet system to image coding. Multiwavelets are of interest because their constituent filters can be simultaneously symmetric and orthogonal (this combination is impossible for 2-band PR-QMFs), and because one can obtain higher orders of approximation (more vanishing wavel...

In copy-move forgery, the copied region may be rotated and/or scaled to fit the scene better. Most of the existing methods fail when the region is subject to affine transforms. This paper presents a method for detecting this kind of image tampering based on circular pattern matching. The image is first filtered and divided into circular blocks. A rotation and scaling invariant feature is then e...

A pre/post-filtering framework for DCT image coding has been proposed recently. Together with Wiener filtering technique, the new framework has been investigated for error resilient image coding. In this paper, after a review of existing methods, we analyze the limitation associated with one of the current design criteria, the reconstruction gain, and propose an alternative that offers better c...

POST-PROCESSING OF VIDEO Mark A. Robertson and Robert L. Stevenson Department of Electrical Engineering University of Notre Dame Notre Dame, IN 46556 fmrobert2,[email protected] ABSTRACT We propose a method of reducing the computational complexity of iterative video post-processing algorithms that make use of the convex quantization constraint set. Rather than constraining all DCT coe cients in a blo...

Despite the development of new imaging techniques, existing X-ray data remain an appropriate tool to study speech production phenomena. However, to exploit these images, the shapes of the vocal tract articulators must first be extracted. This task, usually manually realized, is long and laborious. This paper describes a semi-automatic technique for facilitating the extraction of vocal tract con...