Effect of various digital processing algorithms on the measurement accuracy of endodontic file length

2007 ◽  
Vol 103 (2) ◽  
pp. 280-284 ◽  
Author(s):  
Betül İlhan Kal ◽  
B. Güniz Baksı ◽  
Nesrin Dündar ◽  
Bilge Hakan Şen
Keyword(s):  
Measurement Accuracy ◽  
Digital Processing ◽  
Processing Algorithms

Applied Study of Size Measurement Based on Image

2014 ◽  
Vol 571-572 ◽  
pp. 693-696
Author(s):  
Wei Wei Zhang ◽  
Lu Lu Yuan
Keyword(s):  
Measurement Accuracy ◽  
Measurement Range ◽  
Size Measurement ◽  
Image Size ◽  
Data Measurement ◽  
Applied Study ◽  
Calibration Experiment ◽  
Design Requirements ◽  
Image Processing Algorithms ◽  
Processing Algorithms

Part size measurement is a very common and important projects in the production and life, Image size measurement system is composed of camera and Image processing algorithms, Size measurements is finished on this platform. Pixel equivalent of 0.1198 mm / pixel and measurement range of 0.1198 ~ 42.169 mm is got by calibration experiment, analyzing experimental data, measurement accuracy reaches ± 0.09 mm. Instrument work properly and meet the design requirements in a laboratory environment.

scholarly journals Low Altitude Measurement Accuracy Improvement of the Airborne FMCW Radio Altimeters

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 888 ◽  
Author(s):  
Ján Labun ◽  
Pavol Kurdel ◽  
Marek Češkovič ◽  
Alexey Nekrasov ◽  
Ján Gamec
Keyword(s):  
Traffic Safety ◽  
Basic Equation ◽  
Measurement Accuracy ◽  
Digital Processing ◽  
Critical Height ◽  
New Findings ◽  
Low Altitude ◽  
The Difference ◽  
Definition Of ◽  
Dynamic Formation

This manuscript focuses on the analysis of a critical height of radio altimeters that can help for the development of new types of aeronautical radio altimeters with increased accuracy in measuring low altitudes. Altitude measurement accuracy is connected with a form of processing the difference signal of a radio altimeter, which carries information on the measured altitude. The definition of the altitude measurement accuracy is closely linked to the value of a critical height. Modern radio altimeters with digital processing of a difference signal could shift the limit of accuracy towards better values when the basics of the determination of critical height are thoroughly known. The theory results from the analysis and simulation of dynamic formation and the dissolution of the so-called stable and unstable height pulses, which define the range of the critical height and are presented in the paper. The theory is supported by a new method of derivation of the basic equation of a radio altimeter based on a critical height. The article supports the new theory of radio altimeters with the ultra-wide frequency deviation that lead to the increase the accuracy of a low altitude measurement. Complex mathematical analysis of the dynamic formation of critical height and a computer simulation of its course supported by the new form of the derivation of the basic equation of radio altimeter guarantee the correctness of the new findings of the systematic creation of unstable height pulses and the influence of their number on the altitude measurement accuracy. Application of the presented findings to the aviation practice will contribute to increasing the accuracy of the low altitude measurement from an aircraft during its landing and to increasing air traffic safety.

Influence Quantity Estimation in Face Recognition Digital Processing Algorithms

2013 ◽  
pp. 435-438
Author(s):  
G. Betta ◽  
D. Capriglione ◽  
M. Corvino ◽  
C. Liguori ◽  
A. Paolillo ◽  
...  
Keyword(s):  
Face Recognition ◽  
Digital Processing ◽  
Processing Algorithms

scholarly journals Possibilities of Increasing the Low Altitude Measurement Precision of Airborne Radio Altimeters

Electronics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 191 ◽  
Author(s):  
Ján Labun ◽  
Martin Krchňák ◽  
Pavol Kurdel ◽  
Marek Češkovič ◽  
Alexey Nekrasov ◽  
...  
Keyword(s):  
Traffic Safety ◽  
Pulse Shaping ◽  
Measurement Accuracy ◽  
Continuous Wave ◽  
Digital Processing ◽  
Measurement Precision ◽  
Frequency Increase ◽  
Height Measurement ◽  
Low Altitude ◽  
Double Channel

The paper focuses on the new trend of increasing the accuracy of low altitudes measurement by frequency-modulated continuous-wave (FMCW) radio altimeters. The method of increasing the altitude measurement accuracy has been realized in a form of a frequency deviation increase with the help of the carrier frequency increase. In this way, the height measurement precision has been established at the value of ±0.75 m. Modern digital processing of a differential frequency cannot increase the accuracy limitation considerably. It can be seen that further increase of the height measurement precision is possible through the method of innovatory processing of so-called height pulses. This paper thoroughly analyzes the laws of height pulse shaping from the differential frequency presented by the number that represents the information about the measured altitude for this purpose. This paper presents the results of the laboratory experimental altitude measurement with the use of a so-called double-channel method. The application of obtained results could contribute to the increase of air traffic safety, mainly in the phase of the aircraft approaching for landing and landing itself.

Application of FEM Mesh Generation Algorithm for Digital Processing of Handmade Sketches

2015 ◽  
Vol 797 ◽  
pp. 19-26
Author(s):  
Marcin Gryniewicz ◽  
Jerzy K. Szlendak
Keyword(s):  
Mesh Generation ◽  
Input Data ◽  
Computer Software ◽  
Digital Processing ◽  
Engineering Structures ◽  
User Input ◽  
C Programming Language ◽  
C Programming ◽  
Different Shapes ◽  
Processing Algorithms

Handmade sketches of different shapes roof structures, often with openings, are outlined on plain sheet of paper. Then, they are transformed by a 2D mesh generation and applied to FEM calculations. Algorithm where only main coordinates of nodes are used as user input data is studied by the Authors. Shape of the surface, its curvature and openings are detected through the procedures developed in the C++ programming language. A particular emphasis is put to the automation of the process. At a present version the method is used for rectangular shapes, which are quite common in civil engineering structures e.g. building elevations. Detection and processing algorithms are implemented with a usage of a library based on a open code called OpenCV. The computer software is described in this paper and some examples are given

Review on Multi-Point Method for Roundness Error Separation

2013 ◽  
Vol 797 ◽  
pp. 555-560
Author(s):  
Fen Fen Zhou ◽  
Hui Zong Lu ◽  
Ju Long Yuan ◽  
Fan Li
Keyword(s):  
Data Processing ◽  
Future Development ◽  
Mixed Method ◽  
Measurement Errors ◽  
Measurement Accuracy ◽  
Development Trend ◽  
Point Method ◽  
Roundness Error ◽  
Error Separation ◽  
Processing Algorithms

While measurement accuracy can be increased through continuously improving instrument precision, certain measurement errors can be eliminated via data processing using properly devised processing algorithms. Multi-point roundness error separation methods that are the subjects of study in this paper are reviewed, in particularly, three-point method and other multi-point methods that are based on three-point roundness error separation method, such as two-point method, mixed method and four-point method are summarized. Finally a comparison between each separation methods mentioned in this paper is made. Our views of future development trend in multi-point roundness error separation methods are presented.

A method to measure pores and fissures in geologic materials under S.E.M. by digital image processing

1978 ◽  
Vol 36 (1) ◽  
pp. 212-213
Author(s):  
L. Montoto ◽  
M. Montoto ◽  
A. Bel-Lan
Keyword(s):  
Image Processing ◽  
Optical Microscopy ◽  
Digital Image Processing ◽  
Digital Image ◽  
Digital Processing ◽  
Free Surfaces ◽  
Geologic Materials ◽  
Automatic Information ◽  
Detector Output ◽  
Rock Specimens

INTRODUCTION.- The physical properties of rock masses are greatly influenced by their internal discontinuities, like pores and fissures. So, these need to be measured as a basis for interpretation. To avoid the basic difficulties of measurement under optical microscopy and analogic image systems, the authors use S.E.M. and multiband digital image processing. In S.E.M., analog signal processing has been used to further image enhancement (1), but automatic information extraction can be achieved by simple digital processing of S.E.M. images (2). The use of multiband image would overcome difficulties such as artifacts introduced by the relative positions of sample and detector or the typicals encountered in optical microscopy.DIGITAL IMAGE PROCESSING.- The studied rock specimens were in the form of flat deformation-free surfaces observed under a Phillips SEM model 500. The SEM detector output signal was recorded in picture form in b&w negatives and digitized using a Perkin Elmer 1010 MP flat microdensitometer.

Digital Processing of STEM Images

1981 ◽  
Vol 39 ◽  
pp. 236-237
Author(s):  
A. V. Crewe ◽  
M. Ohtsuki
Keyword(s):  
High Resolution ◽  
Low Dose ◽  
Assembly Language ◽  
Processing System ◽  
Principal Component ◽  
Digital Processing ◽  
Image Analysis System ◽  
Black And White ◽  
Analysis System ◽  
Dose Imaging

We have assembled an image processing system for use with our high resolution STEM for the particular purpose of working with low dose images of biological specimens. The system is quite flexible, however, and can be used for a wide variety of images.The original images are stored on magnetic tape at the microscope using the digitized signals from the detectors. For low dose imaging, these are “first scan” exposures using an automatic montage system. One Nova minicomputer and one tape drive are dedicated to this task.The principal component of the image analysis system is a Lexidata 3400 frame store memory. This memory is arranged in a 640 x 512 x 16 bit configuration. Images are displayed simultaneously on two high resolution monitors, one color and one black and white. Interaction with the memory is obtained using a Nova 4 (32K) computer and a trackball and switch unit provided by Lexidata.The language used is BASIC and uses a variety of assembly language Calls, some provided by Lexidata, but the majority written by students (D. Kopf and N. Townes).

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