Minimising algorithm-induced artefacts in true ortho-image generation: a direct method implemented in the vector domain

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Abstract:

Abstract

True ortho-images are generated from perspective images with both object and terrain displacement distortion corrected and with occlusions removed. However, widely used algorithms based on a Z-buffer have drawbacks and may result in artefacts in the generated ortho-images. This paper analyses the artefacts induced by Z-buffer algorithms in true ortho-image generation, and proposes a vector-based method to avoid algorithm-induced artefacts. The proposed method treats a perspective image pixel as a square patch instead of an image pixel point, and generates ortho-images in the vector domain. Under the vector implementation, occlusion detection is a simple process, and image resampling becomes a straightforward procedure. Most importantly, this method can minimise artefacts in the ortho-images so generated.

Keywords: Z-buffer; image artefacts; occlusion detection; true orthophotos; vector-based resampling

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1477-9730.2007.00425.x

Affiliations: ( ) University of California, Los Angeles, Email: ysheng@geog.ucla.edu

Publication date: June 1, 2007

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