Ying Chen

Abstract

Light reflection models for computer graphics have been developed over the past several decades. For real paint surfaces, it is possible to model their bidirectional reflectance distribution function with simple models. A framework was established to evaluate two simple reflection models, Phong and Torrance-Sparrow, which were used to render artist paint surfaces under different illumination angles. An image acquisition system was devised to capture the images under selected illuminated angles. The parameters of the specular and the diffuse components were estimated with these image sequences. At the evaluation stage, both physicallybased metrics and psychophysical techniques were used to evaluate the estimation accuracy of each model. For both methods, the comparison of the estimations of the two models showed that better estimations were obtained from the Torrance-Sparrow model for glossy samples. The estimation accuracies of the two models were almost the same for matte samples. In addition, based on the analyses of the specular peak width and the histogram of the peak values, the optimized location and minimal number ofmeasurements were determinedfor four kinds ofpaint samples.

Library of Congress Subject Headings

Reflectance--Computer simulation; Reflectance--Analysis; Art--Reproduction; Computer graphics--Technique

Publication Date

2008

Document Type

Thesis

Student Type

Graduate

Degree Name

Color Science (MS)

Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)

Advisor

Roy S. Berns

Advisor/Committee Member

James A. Ferwerda

Comments

Physical copy available from RIT's Wallace Library at QC425 .C43 2006

Campus

RIT – Main Campus

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