31 December 2013 Towards standardized assessment of endoscope optical performance: geometric distortion
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Abstract
Technological advances in endoscopes, such as capsule, ultrathin and disposable devices, promise significant improvements in safety, clinical effectiveness and patient acceptance. Unfortunately, the industry lacks test methods for preclinical evaluation of key optical performance characteristics (OPCs) of endoscopic devices that are quantitative, objective and well-validated. As a result, it is difficult for researchers and developers to compare image quality and evaluate equivalence to, or improvement upon, prior technologies. While endoscope OPCs include resolution, field of view, and depth of field, among others, our focus in this paper is geometric image distortion. We reviewed specific test methods for distortion and then developed an objective, quantitative test method based on well-defined experimental and data processing steps to evaluate radial distortion in the full field of view of an endoscopic imaging system. Our measurements and analyses showed that a second-degree polynomial equation could well describe the radial distortion curve of a traditional endoscope. The distortion evaluation method was effective for correcting the image and can be used to explain other widely accepted evaluation methods such as picture height distortion. Development of consensus standards based on promising test methods for image quality assessment, such as the method studied here, will facilitate clinical implementation of innovative endoscopic devices.
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Quanzeng Wang, Quanzeng Wang, Viraj N. Desai, Viraj N. Desai, Ying Z. Ngo, Ying Z. Ngo, Wei-Chung Cheng, Wei-Chung Cheng, Joshua Pfefer, Joshua Pfefer, } "Towards standardized assessment of endoscope optical performance: geometric distortion", Proc. SPIE 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 904205 (31 December 2013); doi: 10.1117/12.2044103; https://doi.org/10.1117/12.2044103
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