Journal
Scientific and technical journal of information technologies, mechanics and optics
UDK004.932.2
Issue:4 (92)
Download PDF0 Kbyte
ACCURACY EVALUATION FOR THE NON-CONTACT DEFECT AREA MEASUREMENT AT THE COMPLEX-SHAPE SURFACES UNDER VIDEOENDOSCOPIC CONTROL
Annotation
The problem of non-contact surface defect area measurement at complex-shape objects under videoendoscopic control is considered. Major factors contributing to the measurement uncertainty are analyzed for the first time. The proposed method of accuracy analysis is based on the evaluation of 3D coordinates of surface points from 2D projections under assumption of projective camera model and Mahalanobis distance minimization in the image plane. Expressions for area measurement error caused by sum-of-triangles approximation are obtained analytically for practically important cases of cylindrical and spherical surfaces. It is shown that the magnitude of this error component for a single triangle does not exceed 1% for the real values of parameters of the endoscopic imaging system. Expressions are derived for area measurement uncertainty evaluation on arbitrary shape surfaces, caused by measurement errors of 3D coordinates of individual points with and without a priori information about surface shape. Verification of the obtained expressions with real experiment data showed that area measurement error for a complex figure, given by a set of points, is mainly caused by ignoring the fact that these points belong to the surface. It is proved that the use of a priori information about investigated surface shape, which is often available from the design documentation, in many cases would radically improve the accuracy of surface defects area measurement. The presented results are valid for stereoscopic, shadow and phase methods of video endoscopic measurements and can be effectively used in development of new non-contact measuring endoscopic systems and modernization of existing ones.
Keywords
Постоянный URL
Articles in current issue
- PHOTONICS AND OPTICAL INFORMATICS IN EUROPE: TRENDS OF 2003–2013
- TWO-DIMENSIONAL LOCALIZATION OF ATOMIC POPULATIONS IN FOUR-LEVEL QUANTUM SYSTEMS
- THE RECURRENT ALGORITHM FOR INTERFEROMETRIC SIGNALS PROCESSING BASED ON MULTI-CLOUD PREDICTION MODEL
- INVESTIGATION OF BIOLOGICAL OBJECTS IN OPTICAL COHERENCE TOMOGRAPHY WITH DATA PROCESSING BY SEQUENTIAL MONTE CARLO METHOD
- AUTOMATIC CALIBRATION METHOD FOR STEREOSCOPIC SYSTEM
- METHOD OF IMAGE QUALITY ENHANCEMENT FOR SPACE OBJECTS
- ROBUST REGULATION FOR SYSTEMS WITH POLYNOMIAL NONLINEARITY APPLIED TO RAPID THERMAL PROCESSES
- NANOSTRUCTURING AS A WAY FOR THERMOELECTRIC EFFICIENCY IMPROVEMENT
- SPECTRAL AND LUMINESCENT PROPERTIES OF CHROMIUM IONS IN FORSTERITE-LIKE NANO-GLASS CERAMICS
- SPECTRAL AND LUMINESCENT PROPERTIES OF FLUOROPHOSPHATE GLASSES DOPED WITH YTTERBIUM AND ERBIUM
- PARAMETERS OPTIMIZATION OF METAL-DIELECTRIC NANOSTRUCTURES FOR SENSOR APPLICATIONS
- HLD-METHODOLOGY APPLICATION FOR RECONFIGURABLE EMBEDDED SYSTEMS DESIGN
- METHOD OF HIGH-QUALITY SPEECH SYNTHESIS WITH A SMALL DATABASE USAGE
- DETECTION OF CLIPPED FRAGMENTS IN ACOUSTIC SIGNALS
- TWO-LEVEL HIERARCHICAL COORDINATION QUEUING METHOD FOR TELECOMMUNICATION NETWORK NODES
- AN APPROACH FOR CLONE DETECTION IN DOCUMENTATION REUSE
- EFFECTIVENESS ASSESSMENT METHODOLOGY OF INFORMATION SECURITY MANAGEMENT SYSTEM THROUGH THE SYSTEM RESPONSE TIME TO INFORMATION SECURITY INCIDENTS
- MOVING PERSON IDENTIFICATION IN VIDEO SURVEILLANCE SYSTEMS
- MULTISENSOR SYSTEM APPLICATION FOR PREPARATIONS BITTERNESS EVALUATION IN TRADITIONAL CHINESE MEDICINE
- COMPARATIVE ANALYSIS OF ENERGY ACCUMULATION SYSTEMS AND DETERMINATION OF OPTIMAL APPLICATION AREAS FOR MODERN SUPER FLYWHEELS
- MULTI-GRID METHOD OF CONVERGENCE SPEEDING-UP FOR THE SOLUTION OF GAS DYNAMICS PROBLEMS ON UNSTRUCTURED MESHES
- EXTENSION OF TENSOR PRODUCT FOR OPERATORS ON THE DIRAC OPERATOR EXAMPLE
- MOLECULAR DYNAMIC SIMULATION OF PEPTIDE POLYELECTROLYTES
- IDENTIFICATION OF NONLINEAR MODEL PARAMETERS FOR RAPID THERMAL PROCESSES