Geometric Models of Rolling-Shutter Cameras

Cameras with rolling shutters are becoming more common as low-power, low-cost CMOS sensors are being used more frequently in cameras. The rolling shutter means that not all scanlines are exposed over the same time interval. The effects of a rolling shutter are noticeable when either the camera or ob...

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Bibliographic Details
Published in:arXiv.org 2005-03
Main Authors: Meingast, Marci, Geyer, Christopher, Sastry, Shankar
Format: Article
Language:English
Subjects:
Angular velocity
Cameras
CMOS
Projection
Projective geometry
Shutters
Online Access:Get full text
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Summary:Cameras with rolling shutters are becoming more common as low-power, low-cost CMOS sensors are being used more frequently in cameras. The rolling shutter means that not all scanlines are exposed over the same time interval. The effects of a rolling shutter are noticeable when either the camera or objects in the scene are moving and can lead to systematic biases in projection estimation. We develop a general projection equation for a rolling shutter camera and show how it is affected by different types of camera motion. In the case of fronto-parallel motion, we show how that camera can be modeled as an X-slit camera. We also develop approximate projection equations for a non-zero angular velocity about the optical axis and approximate the projection equation for a constant velocity screw motion. We demonstrate how the rolling shutter effects the projective geometry of the camera and in turn the structure-from-motion.
ISSN:2331-8422