Design Of The Optical System For Medical Hard Endoscope And Image Processing

Along with the continuous development and progress of medical industry,endoscope has become one of the widely used medical instruments in the diagnosis and treatment of many diseases,and plays an important role in many clinical operations.The rigid endoscope is mainly used in the abdominal cavity,nasal,joints,and other parts of the disease detection and treatment.It has a series of advantages,such as high color reduction,clear image,and the perspective can be selected according to the need,which has attracted extensive attention and has a broad market and development prospect.In this paper,the optical system structure and image algorithm function and principle of medical rigid endoscope are fully analyzed,and the optical coupler?s and Philips splitting prism?s optical system of 3CMOS medical rigid endoscope are analyzed and designed.This paper studies the image algorithm of endoscope image optimization.The research work of this paper mainly includes the following aspects:1.3CMOS rigid endoscope optical system structure were analyzed in detail,the endoscopic optical system consists of a rod lens,optical coupler,Philips splitting prism and three pieces of CMOS image sensors.The structure and imaging transmission principle of endoscope rod mirror were analyzed.The function of optical coupler was introduced.The working principle of Philips splitting prism system and the advantages and disadvantages of 3CMOS compared with single-color CMOS were described in detail2.The optical modeling of Philips splitting prism was studied.Firstly,the Philips prism geometry parameters were calculated and the prism geometry modeling was established.Secondly,the principle of the film system and the anti-reflection film system were studied.The whole optical system of Philips prism was modeled and analyzed based on the geometric structure model and the membrane system.It can meet the requirements of RGB tricolor separation,but the analysis showed that the color separation effect of this structure was not ideal.3.The optimization design of Philips prism structure was carried out.The reason that Philips prism was not ideal was analyzed.The structure of Philips prism was optimized and designed according to the analysis.the optimized structure has the same spectrophotometric efficiency for RGB tricolor light,and the overall spectrophotometric effect is better.4.The optical coupler was analyzed and modeled.The selection and configuration of CMOS image sensor and its parameters were introduced.The parameters of adaptive optical coupler were analyzed.The initial structure of optical coupler was selected and optimized according to the design requirements.Through modeling analysis,the coupler structure of 5 million pixel resolution that met the design requirements was finally obtained.5.The image processing algorithm of rigid endoscope was studied and designed.Three endoscopic image processing algorithms were designed according to the characteristics of endoscopic images.The principle of each image algorithm was analyzed in detail.The algorithms were verified on the endoscope platform,the difference of images before and after processing was compared,the advantages and disadvantages of each algorithm were analyzed,and the processing was optimized.