NLT and extrapolated DLT: 3-D cinematography alternatives for enlarging the volume of calibration

Richard N. Hinrichs; Scott P. McLean

doi:10.1016/0021-9290(95)00034-F

NLT and extrapolated DLT: 3-D cinematography alternatives for enlarging the volume of calibration

Richard N. Hinrichs, Scott P. McLean

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

This study investigated the accuracy of the direct linear transformation (DLT) and non-linear transformation (NLT) methods of 3-D cinematography/videography. A comparison of standard DLT, extrapolated DLT, and NLT calibrations showed the standard (non-extrapolated) DLT to be the most accurate, especially when a large number of control points (40-60) were used. The NLT was more accurate than the extrapolated DLT when the level of extrapolation exceeded 100%. The results indicated that when possible one should use the DLT with a control object sufficiently large as to encompass the entire activity being studied. However, in situations where the activity volume exceeds the size of one's DLT control object, the NLT method should be considered.

Original language	English (US)
Pages (from-to)	1219-1223
Number of pages	5
Journal	Journal of Biomechanics
Volume	28
Issue number	10
DOIs	https://doi.org/10.1016/0021-9290(95)00034-F
State	Published - Oct 1995

Keywords

Cinematography
Direct linear transformation
Kinematics

ASJC Scopus subject areas

Biophysics
Orthopedics and Sports Medicine
Biomedical Engineering
Rehabilitation

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10.1016/0021-9290(95)00034-F

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title = "NLT and extrapolated DLT: 3-D cinematography alternatives for enlarging the volume of calibration",

abstract = "This study investigated the accuracy of the direct linear transformation (DLT) and non-linear transformation (NLT) methods of 3-D cinematography/videography. A comparison of standard DLT, extrapolated DLT, and NLT calibrations showed the standard (non-extrapolated) DLT to be the most accurate, especially when a large number of control points (40-60) were used. The NLT was more accurate than the extrapolated DLT when the level of extrapolation exceeded 100%. The results indicated that when possible one should use the DLT with a control object sufficiently large as to encompass the entire activity being studied. However, in situations where the activity volume exceeds the size of one's DLT control object, the NLT method should be considered.",

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T2 - 3-D cinematography alternatives for enlarging the volume of calibration

AU - Hinrichs, Richard N.

AU - McLean, Scott P.

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Y1 - 1995/10

N2 - This study investigated the accuracy of the direct linear transformation (DLT) and non-linear transformation (NLT) methods of 3-D cinematography/videography. A comparison of standard DLT, extrapolated DLT, and NLT calibrations showed the standard (non-extrapolated) DLT to be the most accurate, especially when a large number of control points (40-60) were used. The NLT was more accurate than the extrapolated DLT when the level of extrapolation exceeded 100%. The results indicated that when possible one should use the DLT with a control object sufficiently large as to encompass the entire activity being studied. However, in situations where the activity volume exceeds the size of one's DLT control object, the NLT method should be considered.

AB - This study investigated the accuracy of the direct linear transformation (DLT) and non-linear transformation (NLT) methods of 3-D cinematography/videography. A comparison of standard DLT, extrapolated DLT, and NLT calibrations showed the standard (non-extrapolated) DLT to be the most accurate, especially when a large number of control points (40-60) were used. The NLT was more accurate than the extrapolated DLT when the level of extrapolation exceeded 100%. The results indicated that when possible one should use the DLT with a control object sufficiently large as to encompass the entire activity being studied. However, in situations where the activity volume exceeds the size of one's DLT control object, the NLT method should be considered.

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KW - Kinematics

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NLT and extrapolated DLT: 3-D cinematography alternatives for enlarging the volume of calibration

Abstract

Keywords

ASJC Scopus subject areas

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