Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Filtering and processing of panoramic images obtained using a camera and a wide-angle-imaging reflective surface

Not Accessible

Your library or personal account may give you access

Abstract

There is an increasing interest in wide-angle imaging of the environment using curved reflective surfaces. With this comes the need for appropriate filtering and processing of the acquired images. Here we present a technique for homogeneous, fast filtering of panoramic images captured using a camera and a wide-angle-imaging reflective surface. Imaging of the panoramic environment onto a two-dimensional (2-D) plane necessarily introduces spatial distortions such as stretching and bending that vary with the viewing direction. Therefore, if the panoramic image is to be filtered homogeneously in all viewing directions, it is necessary to match the filtering to the distortions. We show how this can be accomplished. The image acquired by the camera is first digitally unwarped and represented in Cartesian coordinates representing azimuth and elevation. The mappings of patches of uniform size and shape on the viewsphere are then established. Next, for each filter patch the local mappings of great circles along two principal axes (along the local longitudinal and elevational directions) on the image plane are determined. The mappings of these great circles are used to perform the 2-D convolution required by the filtering operation. Convolution along the directions of local, mutually orthogonal great circles permits the filtering to be carried out in a quasi-separable fashion, resulting in increased computational speed and efficiency. Examples of homogeneous filtering using this procedure are presented.

© 2000 Optical Society of America

Full Article  |  PDF Article
More Like This
Reflective surfaces for panoramic imaging

J. S. Chahl and M. V. Srinivasan
Appl. Opt. 36(31) 8275-8285 (1997)

Ultra-wide angle panoramic imaging system based on a multiplexed reflective surface

Fang Ke, Shaohua Gao, Jian Bai, and Kaiwei Wang
Appl. Opt. 62(24) 6507-6517 (2023)

Range estimation with a panoramic visual sensor

J. S. Chahl and M. V. Srinivasan
J. Opt. Soc. Am. A 14(9) 2144-2151 (1997)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved