Keywords

Edge orientation confidence, Hough transform localization, Compass Gradient operator, 7x7 gradient operator, Non-maximum suppression

Abstract

The Hough transform silhouette identification method requires a consistency of edge direction in the identification of similar silhouettes. Many gradient operators used in Hough preprocessing require a thresholding and a non-maxima suppression routine to aid the localization process. These routines may delete edges or cause edge fragmentation. These anomalies degrade the Hough performance due to the lack of accurate silhouette extraction, and reduce the correct localization in the Hough accumulator. Noise or sampling errors can be removed by several enhancement routines presented. They are mean, median, symmetric nearest neighbor, hi pass, and low pass filters.

An edge detection process is presented which produces a directional image and the confidence image that allows subsequent image analysis the ability to determine if the detected original edge orientation is accurate, and to what degree. The orientation confidence is produced by comparing a 7 by 7 operator and the Compass Gradient operator. This allows the Hough process the ability to modify the position of accumulation, thereby improving the Hough localization process.

Notes

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Graduation Date

1987

Semester

Spring

Advisor

Myler, Harley R.

Degree

Master of Science (M.S.)

College

College of Engineering

Format

PDF

Pages

72 pages

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0020603

Subjects

Hough functions; Image processing--Digital techniques--Evaluation; Image processing--Digital techniques--Analysis; Image processing--Statistical methods; Image processing--Digital techniques--Research

Accessibility Status

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