A Measuring Method for Imaging Distortion of Rigid Tube Endoscope

Abstract

The invention discloses a method for measuring imaging distortion of a hard-pipe endoscope. A target pattern can be generated by a liquid crystal display, and can be generated by an independent control system of the liquid crystal display. The target pattern or target stripe gaps can be changed according to actual measurement requirements to satisfy different measurement accuracies or different measurement requirements. The liquid crystal display is regarded as the target in a measuring device, so that no illumination by an extra light source is needed; the liquid crystal display is flexible and variable; the utilization rate is high; and the precision is also high. The measuring device of the invention adopts an imaging CCD to collect an exit pupil image, and the exit pupil image is imaged through a computer screen, so as to facilitate observation and avoid visual fatigue. According to the invention, a computer is adopted to process the acquired image, and MATLAB software is adopted to carry out image processing to calculate the relative distortion of the endoscope, and the operation is fast; the measurement is intelligent; and the precision is high.

Description

technical field [0001] The invention relates to the technical field of optical parameter detection of medical and industrial equipment, in particular to a measurement method for imaging distortion of a rigid endoscope, which is suitable for measuring physical indicators of the distortion of the rigid endoscope. Background technique [0002] As a medical or industrial device, the optical characteristics of endoscopes affect its imaging quality and indirectly affect the safety of observation or diagnosis and treatment. Therefore, endoscope distortion is one of its optical parameters, and its size can be used as an evaluation standard for endoscope imaging quality. At present, the relative distortion at 70% of the circular field of view of the endoscope is commonly used to characterize the distortion of the entire endoscope, which is used as a standard for evaluating the imaging quality of the endoscope. [0003] At present, the first method commonly used to measure the amount ...

AI Technical Summary

Problems solved by technology

This measurement method can only obtain a set of distortion data at 70% of the field of view, and when measuring the diameter of the distorted circular spot, the measurement method is different, and the diameter of the circular spot is different, and the distortion is different.

And the diameter of the circular spot is not easy to measure, causing large distortion errors

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