VTM — an image-processing system for measuring ocular torsion
作者： S.T. Moore , I.S. Curthoys , S.G. McCoy
DOI: 10.1016/0169-2607(91)90124-C
关键词:
摘要: This paper reports a new, fast, accurate realization of an image-processing method measuring ocular torsion (rotation the eyeball around visual axis) called Video Torsion Measurement (VTM). The is to cross-correlate two grey-level distributions arc iris from separate images using fast image processor card interfaced IBM-AT compatible computer. (Matrox MVP-AT) supplied with library low-level functions for controlling hardware operations board and VTM system software, which written in C programming language, incorporates these interface MVP-AT as well carrying out data-acquisition processing algorithms. These programs: acquire illuminated by single infrared (IR) light source; threshold this order identify pupil; calculate pupil area locate centre centre-of-gravity algorithm; record distribution along 256 pixels long at selected radius centre; carry FFT on (interpolated) grey level distribution; store parameters reference comparable iral other test same eye determine amount torsional rotation relative image. interactive designed operation clinical testing situation minimum operator intervention. has resolution 0.1 deg depending used it been validated ways: measure known rotations artificial iris-like pattern also direct simultaneous comparison measures human those standard 35 mm photographic procedure torsion.
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sci-hub.se 参考文章(19)
E F Miller, A Graybiel, Effect of gravitoinertial force on ocular counterrolling. Journal of Applied Physiology. ,vol. 31, pp. 697- 700 ,(1971) , 10.1152/JAPPL.1971.31.5.697
L. Ferman, H. Collewijn, T.C. Jansen, A.V. Van den Berg, Human gaze stability in the horizontal, vertical and torsional direction during voluntary head movements, evaluated with a three-dimensional scleral induction coil technique. Vision Research. ,vol. 27, pp. 811- 828 ,(1987) , 10.1016/0042-6989(87)90078-2
J. Anthony Parker, Robert V. Kenyon, Lwarence R. Young, Measurement of Torsion from Multitemporal Images of the Eye Using Digital Signal Processing Techniques IEEE Transactions on Biomedical Engineering. ,vol. BME-32, pp. 28- 36 ,(1985) , 10.1109/TBME.1985.325613
S. G. Diamond, C. H. Markham, Ocular counterrolling as an indicator of vestibular otolith function Neurology. ,vol. 33, pp. 1460- 1460 ,(1983) , 10.1212/WNL.33.11.1460
L. Ferman, H. Collewijn, A.V. Van den Berg, A direct test of Listing's law—I. Human ocular torsion measured in static tertiary positions Vision Research. ,vol. 27, pp. 929- 938 ,(1987) , 10.1016/0042-6989(87)90009-5
Ian P. Howard, Human visual orientation ,(1982)
Mehdi Hatamian, David J. Anderson, Design Considerations for a Real-Time Ocular Counterroll Instrument IEEE Transactions on Biomedical Engineering. ,vol. 30, pp. 278- 288 ,(1983) , 10.1109/TBME.1983.325117
RICHARD BALLIET, KEN NAKAYAMA, Egocentric orientation is influenced by trained voluntary cyclorotary eye movements Nature. ,vol. 275, pp. 214- 216 ,(1978) , 10.1038/275214A0
Hsieh Hou, H. Andrews, Cubic splines for image interpolation and digital filtering IEEE Transactions on Acoustics, Speech, and Signal Processing. ,vol. 26, pp. 508- 517 ,(1978) , 10.1109/TASSP.1978.1163154
Earl F. Miller, Counterrolling of the human eyes produced by head tilt with respect to gravity. Acta Oto-laryngologica. ,vol. 54, pp. 479- 501 ,(1962) , 10.3109/00016486209126967