Surface characterization plays a significant role in evaluating surface functional performance. In this paper, we introduce wavelet packet transform for surface roughness characterization and surface texture extraction. Surface topography is acquired by a confocal laser scanning microscope. Smooth border padding and de-noise process are implemented to generate a roughness surface precisely. By ...

Response-type road roughness measuring systems estimate pavement roughness from correlation equations. Most of these systems recommend to maintain a constant survey speed or to keep the speed within a certain range. But carrying out a survey with this speed constraint may not always be possible due to the existence of traffic control devices and heavy traffic flow. Therefore, these systems may ...

Two important aspects of part inspection are the measurement of surface shape and surface roughness. We propose a noncontact method of measuring surface shape and surface roughness. The method, which we call “four light photometric stereo”, uses four lights which sequentially iUuminate the object under inspection, and a video camera for taking images of the object. Conceptually, the problem we ...

We consider detailed roughness and conductivity corrections to the Casimir force in the recent Casimir force measurement employing an atomic force microscope. The roughness of the test bodies — a metal plate and a sphere — was investigated with the AFM and the SEM respectively. It consists of separate crystals of different heights and a stochastic background. The amplitude of roughness relative...

The rapid growth of applications of lab-on-chip and bio-MEMES (Micro-electromechanical systems), arranging from cell culture and drug delivery to the microscale energy harvesting, microelectronics cooling, requires an understanding of microfluidic flow. Surface roughness, even at micro and nano scale, both deterministic and random, is considered an important parameter to affect fluid flow at th...

Various applications such as meteorology, climatology or hydrology require information about the soil hydraulic properties over large areas. Microwave radiometry is a promising approach to gather this type of information. The microwave emission from soils is strongly affected by the roughness of the soil surface. This effect has therefore to be quantified to get a reasonable estimation of the h...

The quantitative measurement of surface roughness of planetary surfaces at all scales provides insights into geological processes. Complementary of the analysis of local topographic data of the Martian surface at kilometer scale, as achieved from the Mars Orbiter Laser Altimeter (MOLA) data, and at the sub-centimeter scale using photometric properties derived from multi-angular observations, a ...

The aim of this study was to use a non-tactile optical measurement system to assess the effects of three bleaching agents' concentrations on the surface roughness of dental restoration materials. Two composites (Grandio, Venus) and one glass ionomer cement (Ketac Fil Plus) were used in this in vitro study. Specimens were treated with three different bleaching agents (16% and 22% carbamide perox...

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...

A loudness measurement which takes account of the spectral and temporal structure of a sound event, better than the A-weighted SPL, has advantages. Nevertheless, it is not universally accepted because the loudness measurement does not allow a complete judgment of complex sound events comparable to human hearing. In addition to loudness, there are other psychoacoustic parameters such as sharpnes...