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Register a new userBarrel Distortion Correction by Using Image Processing Techniques
تصحيح التشوه التحدبي باستخدام توابع MATLAB الخاصة بتقنيات معالجة الصورة
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رانية ريس( باحث )
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يقدم البحث دراسة لأنواع التشوه الدائري (Radial Distortion) الناتج عن الكاميرات الرقمية، مثل التشوه التحدبي (Barrel Distortion) و التشوه التقعري (Pincushion Distortion). تم استخدام توابع MATLAB الخاصة بتقنيات معالجة الصورة لتصحيح التشوه التحدبي الناتج عن العدسات المتسعة الزاوية (wide angle lenses) للكاميرات الرقمية، حيث تم إيجاد نموذج رياضي يعبر عن التشوه التحدبي، و وضع خوارزمية لتصحيح هذا التشوه، تعتمد الخوارزمية على إيجاد القيم الدقيقة لبارامترات المعادلة التي تعبر عن التشوه، و مقارنة الصورة بنموذج الشبكة القياسي لتحديد البيكسلات المسببة للتشوه في الصورة و إعادتها إلى مكانها الصحيح، للحصول في النهاية على صورة مصححة أقرب ما تكون إلى الصورة الحقيقية.
The various types of radial distortions generated by digital cameras are presented in this paper, like Barrel Distortions and Pincushion Distortion. Image processing techniques are used to correct the barrel distortion generated by wide-angle lenses of digital cameras. A model for barrel distortions is founded. Moreover, an algorithm for correcting this distortion is developed. This algorithm depends on finding the right parameters of the model. The grid pattern is used to detect pixels that caused the distortion and reallocate these pixels back into their original locations, making the corrected photo as close as possible to the original.
References used
<Bismpigiannis, A. Measurements and correction of geometric distortion, Downloaded 15 Mar 2013. <http://scien.stanford.edu/pages/labsite/2007/psych221/projects/07/geometric_distortion/pr oject.htm
<Ford, A. ; Robert, A. Colour Space Conversions, Downloaded 06 May 2013. <http://www.poynton.com/PDFs/coloureq.pdf
Eadie, D. ; Shevlin, F.; Nisbet, A.P. Geometric Correction of Image Distortion using FPGAs. Proceedings of SPIE Conference on Optical Metrology, Imaging and Machine Vision, Galway, Ireland, Volume 4877, 28-37, 2002
Zorin, D.; Barr, A. Correction of Geometric Perceptual Distortion in Pictures. Computer Graphics, New York, USA, 257-264, 2010
G. E. Karras, G. Mountrakis, P. Patias, E. Petsa. Modeling Distortion of super-wideangle lenses for Architectural and Archaeological applications. International Archives of Photogrammetry & Remote Sensing, 32(5), pp. 570-573, Hakodate, Japan, September 2003
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