Continuous Focusing of Moving Objects using Image Defocus

Gopal Surya; Murali Subbarao

doi:10.1117/12.188739

Continuous Focusing of Moving Objects using Image Defocus

Gopal Surya
, Murali Subbarao

Electrical Engineering

Stony Brook University

Stony Brook University

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

Abstract

A Depth-from-Defocus method named STM^11-13 was presented recently for stationary objects. Here we extend STM for continuous focusing of moving objects. The method is named Continuous STM or CSTM. Focusing is done by moving the lens with respect to the image detector. Two variations of CSTM - CSTM1 and CSTM2 - are presented. CSTM1 is a straight forward extension of STM described in.12 It involves calibration of the camera for a number (about 6 in our implementation) of discrete lens positions. In CSTM2 the camera is calibrated only for one lens position. The calibration data corresponding to other lens positions are obtained by transforming the data of the one lens position for which the camera is calibrated. In the experimental results presented here, the focusing error in lens position was about 2.25% for CSTM1 and about 3% for CSTM2.

Original language	English
Pages (from-to)	276-289
Number of pages	14
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2347
DOIs	https://doi.org/10.1117/12.188739
State	Published - Oct 3 1994
Event	Machine Vision Applications, Architectures, and Systems Integration III 1994 - Boston, United States Duration: Oct 31 1994 → Nov 4 1994

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title = "Continuous Focusing of Moving Objects using Image Defocus",

abstract = "A Depth-from-Defocus method named STM11-13 was presented recently for stationary objects. Here we extend STM for continuous focusing of moving objects. The method is named Continuous STM or CSTM. Focusing is done by moving the lens with respect to the image detector. Two variations of CSTM - CSTM1 and CSTM2 - are presented. CSTM1 is a straight forward extension of STM described in.12 It involves calibration of the camera for a number (about 6 in our implementation) of discrete lens positions. In CSTM2 the camera is calibrated only for one lens position. The calibration data corresponding to other lens positions are obtained by transforming the data of the one lens position for which the camera is calibrated. In the experimental results presented here, the focusing error in lens position was about 2.25\% for CSTM1 and about 3\% for CSTM2.",

author = "Gopal Surya and Murali Subbarao",

note = "Publisher Copyright: {\textcopyright} 1994 SPIE. All rights reserved.; Machine Vision Applications, Architectures, and Systems Integration III 1994 ; Conference date: 31-10-1994 Through 04-11-1994",

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AU - Surya, Gopal

AU - Subbarao, Murali

PY - 1994/10/3

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N2 - A Depth-from-Defocus method named STM11-13 was presented recently for stationary objects. Here we extend STM for continuous focusing of moving objects. The method is named Continuous STM or CSTM. Focusing is done by moving the lens with respect to the image detector. Two variations of CSTM - CSTM1 and CSTM2 - are presented. CSTM1 is a straight forward extension of STM described in.12 It involves calibration of the camera for a number (about 6 in our implementation) of discrete lens positions. In CSTM2 the camera is calibrated only for one lens position. The calibration data corresponding to other lens positions are obtained by transforming the data of the one lens position for which the camera is calibrated. In the experimental results presented here, the focusing error in lens position was about 2.25% for CSTM1 and about 3% for CSTM2.

AB - A Depth-from-Defocus method named STM11-13 was presented recently for stationary objects. Here we extend STM for continuous focusing of moving objects. The method is named Continuous STM or CSTM. Focusing is done by moving the lens with respect to the image detector. Two variations of CSTM - CSTM1 and CSTM2 - are presented. CSTM1 is a straight forward extension of STM described in.12 It involves calibration of the camera for a number (about 6 in our implementation) of discrete lens positions. In CSTM2 the camera is calibrated only for one lens position. The calibration data corresponding to other lens positions are obtained by transforming the data of the one lens position for which the camera is calibrated. In the experimental results presented here, the focusing error in lens position was about 2.25% for CSTM1 and about 3% for CSTM2.

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U2 - 10.1117/12.188739

DO - 10.1117/12.188739

M3 - Conference article

SN - 0277-786X

VL - 2347

SP - 276

EP - 289

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Machine Vision Applications, Architectures, and Systems Integration III 1994

Y2 - 31 October 1994 through 4 November 1994

ER -

Continuous Focusing of Moving Objects using Image Defocus

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