Image Distortion Correction Method of Confocal Endoscope Based on Fiber Probe

Abstract

The invention discloses a method for correcting image distortion of a confocal endoscope based on an optical fiber probe, comprising the following steps: collecting a background image through the confocal endoscope based on an optical fiber probe; Calculate the shape and position of the fiber end face in the theoretical image; establish a distortion correction function according to the relationship between the actual image shape and position of the fiber end face in the background image and the shape and position of the fiber end face in the theoretical image; Lateral distortion of a sample image acquired by a confocal endoscope with a fiber optic probe. On the premise of not increasing the hardware complexity of the confocal endoscope, the image distortion correction method of the present invention can eliminate the problem of image lateral distortion of the confocal endoscope only according to a single picture, and can adapt to the motion of the galvanometer. Regular changes can improve the quality of images and have important clinical value.

Description

technical field [0001] The invention relates to the technical field of confocal endoscopic imaging, in particular to a method for correcting image distortion of confocal endoscopic images based on an optical fiber probe. Background technique [0002] Fiber-optic probe-based confocal endoscopy is a new type of endoscope that combines laser confocal microscopy and traditional endoscopy technology. It can perform high-resolution histological diagnosis on living tissue and achieve Tomography at a certain depth plays an important role in the screening of early tumors and precancerous lesions. [0003] The structure of laser confocal endoscope based on fiber probe is as follows: figure 1 As shown, the laser light from the laser scans the surface of the sample under the deflection of the X / Y-axis scanning galvanometer. The fluorescence excited from the surface of the sample is transmitted to the photodetector through the optical path and converted into electrical signals. The el...

AI Technical Summary

Problems solved by technology

The traditional method to solve the lateral distortion of confocal endoscopic imaging is divided into hardware method and software method. One of the software methods is to directly cut off the areas with serious distortion on both sides, leaving the middle area with better linearity, but the middle of the remaining image Distortion still exists

Another software method is to directly use the sinusoidal curve to represent the motion state of the galvanometer to correct the distortion caused by the movement. However, in actual use, the galvanometer deviates from the standard sinusoidal motion due to the influence of the environment, life and other reasons. At this time, if Still using sinusoidal correction will produce more distortion in the image

The hardware correction method generally uses the pixel clock to perform non-isochronous sampling, but the scanning curve of the galvanometer will change with environmental factors, and the pixel clock cannot follow this change

Moreover, the use of pixel clock will increase the hardware cost of the system

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