Sökning: onr:"swepub:oai:DiVA.org:uu-88116" >
Perimeter estimatio...
Perimeter estimation based on grey level object representation
-
- Sladoje, Natasa (författare)
- Uppsala universitet,Centrum för bildanalys,Datoriserad bildanalys,Faculty of Engineering, University of Novi Sad, Serbia
-
- Lindblad, Joakim (författare)
- Uppsala universitet,Centrum för bildanalys,Datoriserad bildanalys
-
(creator_code:org_t)
- Uppsala, Sweden : Centre for Image Analysis, 2008
- Engelska 31 s.
-
Serie: Rapport, 1100-6641 ; 33
- Relaterad länk:
-
http://www.cb.uu.se/...
-
visa fler...
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- We present a novel method that provides an accurate and precise estimate of the length of the boundary (perimeter) of an object, by taking into account gray-levels on the boundary of the digitization of the same object. Assuming a model where pixel intensity is proportional to the coverage of a pixel, we show that the presented method provides error-free measurements of the length of straight boundary segments in the case of non-quantized pixel values. For a more realistic situation, where pixel values are quantized, we derive optimal estimates that minimize the maximal estimation error. We show that the estimate converges toward a correct value as the number of gray-levels tends toward infinity. The method is easy to implement; we provide complete pseudo-code. Since the method utilizes only a small neighborhood, it is very easy to parallelize. We evaluate the estimator on a set of concave and convex shapes with known perimeters, digitized at increasing resolution.
Ämnesord
- NATURVETENSKAP -- Data- och informationsvetenskap -- Datorseende och robotik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Computer Vision and Robotics (hsv//eng)
Nyckelord
- Image analysis
- Bildanalys
- Computerized Image Analysis
- Datoriserad bildanalys
Publikations- och innehållstyp
- vet (ämneskategori)
- rap (ämneskategori)