Showing papers by "Grant R. Gerhart published in 2003"

Color image segmentation in color and spatial domain

Abstract: In this paper we describe a color image segmentation system that performs color clustering in a color space followed by a color region segmentation algorithm in the image domain. In color space, we describe two different algorithms that clusters similar colors using different measuring criteria and present our evaluation results on these two algorithms in comparison with three well-known color segmentation algorithms. The region segmentation algorithm merges clusters in the image domain based on color similarity and spatial adjacency. We developed three different methods for merging regions in the image domain. The proposed clustering algorithms are applicable to color image indexing and retrieval, object segmentation using color feature and color image mining. The color image segmentation system has been implemented and tested on a variety of color images including satellite images, moving car images and etc. The system has shown to be both effective and efficient.

Polarization Measurement Errors Due to Spatial and Temporal Misregistration

Abstract: : This paper focuses on potential false conclusions regarding polarization parameters obtained through the use of a digital camera. It outlines a methodology for calibrating, displaying and visualizing polarization profiles of natural, daylight scenes using a cars (commercial-off-the-shelf) digital camera. It presents cause and effect scenarios related to spatial and temporal misregistration of polarization data and the acquisition of accurate polarization parameters, such as the degree of polarization and the polarization azimuth and ellipticity angles. Trade-offs between precise spatial registration and precise temporal registration are discussed.