Model and analysis of spectropolarimetric brdf of painted target based on ga-lm method

Chao Chen, Yong Qiang Zhao, Li Luo, Quan Pan, Yong Mei Cheng, Kai Wang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Models based on microfacet were used to describe spectropolarimetric BRDF (short for bidirectional reflectance distribution function) with experimental data. And the spectropolarimetric BRDF values of targets were measured with the comparison to the standard whiteboard, which was considered as Lambert and had a uniform reflectance rate up to 98% at arbitrary angle of view. And then the relationships between measured spectropolarimetric BRDF values and the angles of view, as well as wavelengths which were in a range of 400-720 nm were analyzed in details. The initial value needed to be input to the LM optimization method was difficult to get and greatly impacted the results. Therefore, optimization approach which combines genetic algorithm and Levenberg-Marquardt (LM) was utilized aiming to retrieve parameters of nonlinear models, and the initial values were obtained using GA approach. Simulated experiments were used to test the efficiency of the adopted optimization method. And the simulated experiment ensures the optimization method to have a good performance and be able to retrieve the parameters of nonlinear model efficiently. The correctness of the models was validated by real outdoor sampled data. The parameters of DoP model retrieved are the refraction index of measured targets. The refraction index of the same color painted target but with different materials was also obtained. Conclusion has been drawn that the refraction index from these two targets are very near and this slight difference could be understood by the difference in the conditions of paint targets' surface, not the material of the targets.

Original languageEnglish
Pages (from-to)729-734
Number of pages6
JournalGuang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Volume30
Issue number3
DOIs
StatePublished - Mar 2010

Keywords

  • GALM optimization algorithm
  • Microfacet model
  • Painted target
  • Spectropolarimetric BRDF

Fingerprint

Dive into the research topics of 'Model and analysis of spectropolarimetric brdf of painted target based on ga-lm method'. Together they form a unique fingerprint.

Cite this