APPLYING DITHERING TO IMPROVE DEPTH MEASUREMENT USING A SENSOR-SHIFTED STEREO CAMERA

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Jiandan Chen, Wail Mustafa, Abu Bakr Siddig, Wlodek Kulesza
Title: APPLYING DITHERING TO IMPROVE DEPTH MEASUREMENT USING A SENSOR-SHIFTED STEREO CAMERA
Journal: Metrology and Measurement Systems
Year: 2010
Volume: 17
Issue: 3
ISSN: 0860-8229
Publisher: POLISH ACADEMY OF SCIENCES
ISI number: 000285569400003
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Electrical Engineering, School of Engineering - Dept. of Mechanical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik, Sektionen för ingenjörsvetenskap - avd. för maskinteknik)
School of Engineering S-371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/ing/
Authors e-mail: jian.d.chen@bth.se, wail.mustafa@bth.se, ahsi08@student.bth.se, wlodek.kulesza@bth.se
Language: English
Abstract: The sensor-shifted stereo camera provides the mechanism for obtaining 3D information in a wide field of view. This novel kind of stereo requires a simpler matching process in comparison to convergence stereo. In addition to this, the uncertainty of depth estimation of a target point in 3D space is defined by the spatial quantization caused by the digital images. The dithering approach is a way to reduce the depth reconstruction uncertainty through a controlled adjustment of the stereo parameters that shift the spatial quantization levels. In this paper, a mathematical model that relates the stereo setup parameters to the iso-disparities is developed and used for depth estimation. The enhancement of the depth measurement accuracy for this kind of stereo through applying the dithering method is verified by simulation and physical experiment. For the verification, the uncertainty of the depth measurement using dithering is compared with the uncertainty produced by the direct triangulation method. A 49% improvement of the uncertainly in the depth reconstruction is proved.
Subject: Signal processing\Image and Video Processing
Signal Processing\General
Keywords: depth reconstruction, dithering, skewed parallel, stereo setup, iso-disparity surfaces
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