A descriptor is presented for characterizing local image patches in a scale invariant manner. The descriptor is biologically-plausible in that the necessary computations are simple and local. Two different methods for robot visual homing based on this descriptor are also presented and tested. The first method utilizes the common technique of corresponding descriptors between images. The second ...

Zntroduction Recently, we have demonstrilted the capability of retrospectively mapping a slice image into rin anatomical reference volume (i.e. map-slice-to-volume, MSV) from the same subject using a simple rigid body transformation of $x degrees of freedom (DOF) [l]. In practice, deformation in a sliQe image is often presented as a nonlinear warping problem that his not limited to the imaging ...

A new general solution for the construction of one-to-one image warping functions is presented. The algorithm takes a set of user speci ed translations and constructs a set of one-to-one warps by interpolation and scaling. These are concatenated to produce a single one-to-one warping function, which prevents overlap in the resultant warped image. Perception Laboratory, School of Psychology, Uni...

In this paper we present a novel and efficient depthimage warping technique based on a piece-wise linear approximation of the depth-image as a textured and simplified triangle mesh. We describe the application of a hierarchical triangulation method to generate triangulated depthmeshes efficiently from depth-images, discuss alternative depth-mesh segmentation methods to avoid occlusion artifacts...

Existing algorithms for camera calibration and metric reconstruction are not appropriate for image sets containing geometrically transformed images for which we cannot apply the camera constraints such as square or zero-skewed pixels. In this paper, we propose a framework to use scene constraints in the form of camera constraints. Our approach is based on image warping using images of parallelo...

William R. Mark POST-RENDERING 3D IMAGE WARPING: VISIBILITY, RECONSTRUCTION, AND PERFORMANCE FOR DEPTH-IMAGE WARPING (Under the direction of Dr. Gary Bishop) The images generated by real-time 3D graphics systems exhibit enormous frame-to-frame coherence, which is not exploited by the conventional graphics pipeline. I exploit this coherence by decoupling image rendering from image display. My sy...

In this paper our system for face and facial feature tracking using an Active Model is described. The focus of the paper is image warping methods for achieving real-time performance, in order to show that it is possible to implement a real-time model based coding system on consumer hardware.

The problem of chromatic aberration arises because each wavelength of light is refracted diierently by the elements of a lens. Unfortunately , this means that is image will be blurred and distorted. In color imaging these distortions cause measurable diierences between the images. Recent research has proposed an approach for dealing with this aberrations by actively controlling the optics of th...

Lucas-Kanade and active appearance models are among the most commonly used methods for image alignment and facial fitting, respectively. They both utilize nonlinear gradient descent, which is usually applied on intensity values. In this paper, we propose the employment of highly descriptive, densely sampled image features for both problems. We show that the strategy of warping the multichannel ...

William R. Mark POST-RENDERING 3D IMAGE WARPING: VISIBILITY, RECONSTRUCTION, AND PERFORMANCE FOR DEPTH-IMAGE WARPING (Under the direction of Dr. Gary Bishop) The images generated by real-time 3D graphics systems exhibit enormous frame-to-frame coherence, which is not exploited by the conventional graphics pipeline. I exploit this coherence by decoupling image rendering from image display. My sy...