Accession Number:

ADA090244

Title:

Two Notes on Digital Edges and Lines

Descriptive Note:

Technical rept.

Corporate Author:

MARYLAND UNIV COLLEGE PARK COMPUTER VISION LAB

Personal Author(s):

• Kitchen, Les
• Broder, Alan
• Rosenfeld, Azriel

Report Date:

1980-03-01

Pagination or Media Count:

19.0

Abstract:

This report consists of two independent parts. The first is entitled Non-maximum suppression of gradient magnitudes makes them easier to threshold it shows that, besides reducing thick responses to thin, the application of non-maximum suppression to digital gradient magnitudes also improves the form of the edge response histogram, making the choice of thresholds easier. In the second, entitled A note on collinearity merit, measures of collinearity merit based on distance and angle are defined. They yield reasonable results for edges extracted from an aerial photograph.

Descriptors:

• *IMAGE PROCESSING
• *PATTERN RECOGNITION
• AERIAL PHOTOGRAPHS
• DIGITAL SYSTEMS
• EDGES
• GRAY SCALE
• HISTOGRAMS
• LINE SCANNING
• LINEARITY
• NOISE
• PHOTOGRAPHIC ANALYSIS
• THICKNESS
• THINNESS
• THRESHOLD EFFECTS

Subject Categories:

• Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE