Paper Surface Topography Using Three-light Photometric Stereo
نویسندگان
چکیده
In paper industry, the measurement of paper surface topography is important for paper quality control. Noncontact and fast photometric stereo overcomes the disadvantages of the traditional surface topography measurement by the profilometer. In this paper, we present an improvement to three-light photometric stereo for paper surface topography reconstruction. Experiments comparing reconstructed surfaces to optical profilometer measured surfaces demonstrate that the improvement increases robustness with regard to parameter selection in surface reconstruction, and provides smaller reconstruction errors.
منابع مشابه
Average Surface Roughness Measurement Using Photometric Stereo Method
This paper presents a technique for measuring surface roughness (Ra), using photometric stereo method. The method utilizes three or more images of the measured surface from the same view point, taken sequentially under different illumination conditions. The scenes captured by the camera were reconstructed by the least square method to obtain surface normal from surface topography. Three-dimensi...
متن کاملUse of photometric stereo for the accurate modelling of three-dimensional skin microrelief
The largest organ of human body ”skin” is a multilayered organ with complex reflectance properties that not only vary with the direction of illumination but also with the wavelength of light. The complex Three Dimensional (3D) structure and optical properties of human skin makes it very difficult for techniques like Photometric stereo to accurately recover its 3D shape. One problem in particula...
متن کاملTheoretical Analysis of Scanning Electron Microscopes with Plural Detectors as an Application Field of Photometric Stereo
Surface topography measurement methods using SEM with plural detectors are analyzed as an application field * . of photometric stereo. Plural-detector methods use images from several detectors. These images correspond to ordinary images made with the light source in different positions. SEMs are usually treated as a field for application of shape from shading, but we shodld consider that detect...
متن کاملAverage surface roughness evaluation using 3-source photometric stereo technique
This paper presents a technique for measuring surface roughness (Ra), using photometric stereo method. The method utilizes three or more images of the measured surface from the same viewpoint, taken sequentially under different illumination conditions. The scenes captured by the camera were reconstructed by the least square method to obtain surface normal from surface topography. Three-dimensio...
متن کاملPhotometric Stereo beyond Glass: Active Separation of Transparent Layer and Five-Light Photometric Stereo with M-Estimator Using Laplace Distribution for a Virtual Museum
One of the necessary techniques for constructing a virtual museum is to digitize the artwork arranged inside a glass or acrylic display case without bringing the artwork out of the display case. By using photometric stereo, we estimate the shape (surface normal) and the reflectance (albedo) of the artwork arranged inside a transparent display case. If we illuminate the display case, the light w...
متن کامل