DocumentCode :
3189050
Title :
A fast edge location measurement with subpixel accuracy using a CCD image
Author :
Ohtani, Kozo ; Baba, Mitsuru
Author_Institution :
Graduate Sch. of Natural Sci. & Technol., Okayama Univ., Japan
Volume :
3
fYear :
2001
fDate :
2001
Firstpage :
2087
Abstract :
This paper describes an analogue-based approach to fast subpixel-level edge detection. Although the most common subpixel edge detection methods employ digital-based approaches, they at present show certain drawbacks such as difficulty of fast, in-line subpixel edge detection, the necessity of implementing expensive high-resolution A/D converters, and difficulty in performing continuous, dynamic subpixel edge detection. We propose a new analogue-based first derivative subpixel edge detection approach to surmount these drawbacks. Our method involves the approximation of the distribution curve of the first derivative of the output of a CCD by using the second-order polynomial, and thus can accurately detect a peak position of the differential curve by means of the interpolating calculation, the operation of which is realized primarily through the use of analogue circuitry. The measurements of a concrete form using the prototype system demonstrate that its resolution under ideal conditions is about 1/10 pixels. We thus conclude that the approach described is effective for fast subpixel edge detection
Keywords :
CCD image sensors; analogue processing circuits; computer vision; curve fitting; edge detection; image processing equipment; interpolation; polynomial approximation; sample and hold circuits; CCD image; S/H circuits; analogue-based approach; differential circuit; distribution curve approximation; fast edge location measurement; fast subpixel-level edge detection; first derivative edge detection; interpolating calculation; linear CCD; machine vision; second-order polynomial; subpixel accuracy; Analog-digital conversion; Charge coupled devices; Concrete; Data processing; Delay; Image converters; Image edge detection; Machine vision; Microprocessors; Pixel;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
ISSN :
1091-5281
Print_ISBN :
0-7803-6646-8
Type :
conf
DOI :
10.1109/IMTC.2001.929565
Filename :
929565
Link To Document :
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