A global image restoration scheme using nonnegative matrix factorization (NMF) is proposed in this paper. This NMF-based image restoration scheme can be used for inspecting the defects in directional texture surfaces automatically. Decomposing the gray level of image pixels into an ensemble of row vectors, we first reduce the data set from original data space into a lowerdimensional NMF space. ...

This paper develops an approach that enables an aerial vehicle to carry out 3D surface inspections. Given a 3D environment with a set of objects that need to be inspected, and an inspection quality 0 < α < 1, the objective is to compute a set of waypoints whose joint visibility ratio is at least α and a dynamically-feasible and collision-free trajectory that enables the aerial vehicle to reach ...

A two-stage high-precision algorithm for detecting the orientation and position of the surface mount device (SMD) is described. In the preprocessing step, a coarse orientation of the SMD is obtained by line fitting. A high-precision fuzzy Hough transform (FHT) is applied to the corner points to estimate precisely the orientation of the device, with its position determined by using four detected...

We present an optical method for the nanoscopic inspection of surfaces. The method is based on the spectral and polarization analysis of the light scattered by a probe nanoparticle close to the inspected surface. We explore the sensitivity to changes either in the probe-surface distance or in the refractive index of the surface.

The OPC is one of the most important component in the electrophotography process. So far its surface defects which degrade print quality were inspected by human-eye. We have developed the OPC surface inspection system employing an image processing technique. In this paper, we describe (1) an optical system to get the OPC surface image, (2) its analysis algorithm to specify the various defects a...

A hybrid measurement technique is proposed for high-precision surface inspection. The technique uses an interferometer to image microscopic surface defects. In order to quantify the degree of various surface defects, the interferograms are scanned, digitized, and subsequently converted to a binary image by using an adaptive thresholding technique which takes into account the inhomogeneity of th...

Fuel channel pressure tubes are critical components of the CANDU reactor core which require periodic inspection to demonstrate continued fitness for service. Ontario Power Generation; Inspection & Maintenance Services Division has been operating a variety of inspection systems to perform volumetric and surface nondestructive examinations of the pressure tubes. Since the early days, ultrasonics ...

We introduce a new environmentally robust optical interferometry system for fast surface profile measurement. The proposed white light channelled spectrum Interferometer (WLCSI) is effective for applications in on-line surface inspection because it can obtain a surface profile in a single shot. Compared to the traditional spectral interferometry techniques, cylindrical lens is used in the Miche...

A DI&M program begins with a baseline survey to identify and quantify leaks. Repairs that are cost-effective to fix are then made to the leaking components. Subsequent surveys are based on data from previous surveys, allowing operators to concentrate on the components that are most likely to leak and are profitable to repair. This Lessons Learned study focuses on maximizing the savings that can...