Measurement of Distortion Using the Moire Interferometry

Wenzel, Klára; Ábrahám, György; Tamas, P.; Urbin, Ágnes

doi:10.11648/j.optics.s.2015040301.14

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Most of them deal with calibration of photoelectric cameras for surveying at a fi nite distance, and are not intended for accurate measurements of angular coordinates. The most popular methods of distortion measurement are usually designed to investigate suffi ciently large geometric distortions of the image (more than 1%) with a rel-atively small accuracy [01, 02, 04-10, [13][14][15] or to measure distortion with a high accuracy, but only for narrow fi eld-of-view optical systems [03]. In this article the method is considered for calibration of wide fi eld-of-view video channels for electronic theodolites, intended for measurements of angular coordinates with the accuracy better than 10 arcseconds.…”

Section: Literature Reviewmentioning

confidence: 99%

Method for measuring distortion in wide-angle video channels

Krotov¹,

Volkov²,

Romanov³

et al. 2018

J Appl Eng Science

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Methods for correcting aberrations of images, obtained by an optoelectronic camera with the use of preliminary measured calibration function, provoke wide interest in recent years. For the most part these methods are not characterized by high accuracy and are typically used for cameras with objectives having rather high relative distortion. In this article the method is discussed for measuring distortion of a wide-angle objective for calibration of photoelectric cameras designed to measure angular coordinates of remote objects with the accuracy as high as 10 arcseconds. It is proposed to use an air mirror-wedge as a test object, which allows creating a sheaf of collimated beams. The calibration function of a photoelectric camera is calculated by mathematical post-processing of the recorded frames.The proposed method was experimentally tested for photoelectric cameras with full angular fi elds-of-view of 21 degrees and angular pixel sizes of 20 arcseconds. The subpixel accuracy of determining the calibration function is demonstrated.

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Section: Literature Reviewmentioning

confidence: 99%

Method for measuring distortion in wide-angle video channels

Krotov¹,

Volkov²,

Romanov³

et al. 2018

J Appl Eng Science

View full text Add to dashboard Cite

show abstract

“…It is very important that the disorder should be detected as early as possible. 1 After computer aided diagnostics (CADM Computer Aided Diagnostic in Medicine) if necessary an automatic custommade corset could be realized to make corrections and avoid operations. The primary information for CAD/CAM system is obtained from the special 3D modelling of humans body 2 and after the measuring the influence of device.…”

Section: Introductionmentioning

confidence: 99%