Example-Based Multispectral Photometric Stereo for Multi-Colored Surfaces

Journal of Imaging

Daisuke Miyazaki¹  Kazuya Uegomori¹ 

[1] Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan;

关键词: photometric stereo;    color photometric stereo;    example-based photometric stereo;    multispectral imaging;    multispectral lighting;   

DOI  :  10.3390/jimaging8040107

来源: DOAJ

【 摘 要 】

A photometric stereo needs three images taken under three different light directions lit one by one, while a color photometric stereo needs only one image taken under three different lights lit at the same time with different light directions and different colors. As a result, a color photometric stereo can obtain the surface normal of a dynamically moving object from a single image. However, the conventional color photometric stereo cannot estimate a multicolored object due to the colored illumination. This paper uses an example-based photometric stereo to solve the problem of the color photometric stereo. The example-based photometric stereo searches the surface normal from the database of the images of known shapes. Color photometric stereos suffer from mathematical difficulty, and they add many assumptions and constraints; however, the example-based photometric stereo is free from such mathematical problems. The process of our method is pixelwise; thus, the estimated surface normal is not oversmoothed, unlike existing methods that use smoothness constraints. To demonstrate the effectiveness of this study, a measurement device that can realize the multispectral photometric stereo method with sixteen colors is employed instead of the classic color photometric stereo method with three colors.

【 授权许可】

Unknown