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Reconstructing images of bar codes for construction site object recognition

Gilsinn, D.E. / Cheok, G.S. / O'Leary, D.P.

This paper discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADAR (laser distance and ranging) optics. The first part of this paper describes the experimental data collection of several bar code images along with experimental estimates of the LADAR beam size and configuration at various distances from the source. Mathematical model of the beam size and configuration were developed and were applied through a convolution process to a simulated set of bar code images similar to the original experiment. This was done in order to estimate beam spread models (beam spread models are unique to each specific LADAR) to be used in a deconvolution process to reconstruct the original bar code images from the distorted images. In the convolution process a distorted image in vector form g is associated with a ground truth image f and each element of g is computed as a weighted average of neighboring elements of f to that associated element. The deconvolution process involves a least squares procedure that approximately solves a matrix equation of the form Hf = g where H is a large sparse matrix that is made up of elements from the beam spread function.

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Reconstructing images of bar codes for construction site object recognition

Gilsinn, D.E. / Cheok, G.S. / O'Leary, D.P.

This paper discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADAR (laser distance and ranging) optics. The first part of this paper describes the experimental data collection of several bar code images along with experimental estimates of the LADAR beam size and configuration at various distances from the source. Mathematical model of the beam size and configuration were developed and were applied through a convolution process to a simulated set of bar code images similar to the original experiment. This was done in order to estimate beam spread models (beam spread models are unique to each specific LADAR) to be used in a deconvolution process to reconstruct the original bar code images from the distorted images. In the convolution process a distorted image in vector form g is associated with a ground truth image f and each element of g is computed as a weighted average of neighboring elements of f to that associated element. The deconvolution process involves a least squares procedure that approximately solves a matrix equation of the form Hf = g where H is a large sparse matrix that is made up of elements from the beam spread function.

Reconstructing images of bar codes for construction site object recognition

Gilsinn, D.E. / Cheok, G.S. / O'Leary, D.P.

This paper discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADAR (laser distance and ranging) optics. The first part of this paper describes the experimental data collection of several bar code images along with experimental estimates of the LADAR beam size and configuration at various distances from the source. Mathematical model of the beam size and configuration were developed and were applied through a convolution process to a simulated set of bar code images similar to the original experiment. This was done in order to estimate beam spread models (beam spread models are unique to each specific LADAR) to be used in a deconvolution process to reconstruct the original bar code images from the distorted images. In the convolution process a distorted image in vector form g is associated with a ground truth image f and each element of g is computed as a weighted average of neighboring elements of f to that associated element. The deconvolution process involves a least squares procedure that approximately solves a matrix equation of the form Hf = g where H is a large sparse matrix that is made up of elements from the beam spread function.

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Title:

Reconstructing images of bar codes for construction site object recognition

Additional title:

Rekonstruktion von Strichcodebildern zur Objekterkundung von Bauplätzen

Contributors:

Gilsinn, D.E. (author) / Cheok, G.S. (author) / O'Leary, D.P. (author)

Published in:

ISARC, Automation and Robotics in Construction, 19 ; 363-368

NIST Special Publication (National Institute of Standards and Technology) ; 989

Publication date:

2002

Size:

6 Seiten, 9 Bilder, 1 Tabelle, 3 Quellen

ISSN:

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Strichcode , Linienbild , experimentelles Ergebnis , Lasertechnik , Entfernungsmesser , mathematisches Modell , Verzerrung , Faltungscode , Methode der kleinsten Quadrate , Sparse-Matrix

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