The Research and Application on Light Shape Detection of Car's Headlamp

Xiao Dong Liu; Shu Guang Dai; Ping An Mu

doi:10.4028/www.scientific.net/AMM.483.391

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 483The Research and Application on Light Shape...

The Research and Application on Light Shape Detection of Car's Headlamp

Abstract:

Light shape detection of headlamps is an important project of yearly check. In the aspect of lowbeam detection, it is necessary to not only accurately calculate the boundary between brightness and shade, but also optical axis intersection point. By the principle that the second derivative indicates the concavity and convexity of functions, a polynomial fitting is used to calculate the columns grayscale profile of a lowbeam figure, and then get the cut-off point through second derivative of a polynomial. The boundary between brightness and shade is consisted of these cut-off points. The optical axis intersection point is obtained by second order difference of the boundary. While fully extracting graphic features, the method precisely locates positions of the boundary and the intersection.

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Periodical:

Applied Mechanics and Materials (Volume 483)

Pages:

391-396

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.483.391

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Online since:

December 2013

Authors:

Xiao Dong Liu*, Shu Guang Dai, Ping An Mu

Keywords:

Headlamp, Orthogonal Primary Functions, Polynomial Fitting, Second Derivative (SD)

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