Structural shape analysis method for stereovision image distortion calibration of stereo light microscope (SLM)

Abstract

The invention relates to a structural shape analysis method for the stereovision image distortion calibration of a stereo light microscope (SLM) and belongs to the calibration field of visual image distortion. Particularly, the points of an overall unit are subjected to linear fitting in rows and columns respectively, and then the distortion of a stereo image is calibrated based on the deformation estimation of the overall linear unit. The method mainly comprises the following steps of inputting the left and right images of an SLM, calibrating the lateral distortion of the images, calibrating the longitudinal distortion of the images, calibrating the flatness of a parallax curved surface, and outputting distortion calibration parameters. According to the technical scheme of the invention, the acquired grid points of the overall unit of the left and right images are subjected to the linear fitting and analyzing treatment, so that the distortion calibration parameters of the stereo image can be obtained. In this way, the calibration on the parallax curved surface of the stereo image in the micro stereovision system of the SLM can be realized. Therefore, the method lays a foundation for the calculation of the high-precision 3D coordinates of an image object space. The calibration method is extremely novel and enables the micro-operation in the vision system of the SLM. During the micro-assembly process, the operation is more efficient and more accurate.

Description

technical field [0001] The invention relates to a method for correcting the distortion of SLM microscopic stereo vision images, in particular to performing linear fitting on the overall unit points of the SLM microscopic image according to rows and columns, and estimating the distortion of the stereoscopic image through the deformation of the overall linear unit , and established a high-precision distortion correction method. Background technique [0002] SLM is a high-precision optical stereo microscope, including a main optical axis and two sets of sub-optical paths. The space range is on the order of several millimeters. The left and right images under the SLM vision system accurately reflect the geometric structure of the object space from two angles. This type of system has been used in the fields of micro-measurement, micro-operation, micro-assembly, micro-injection, etc widely used in. In this optical stereo microscope, since the main optical axis and the optical ax...

AI Technical Summary

Problems solved by technology

The distortion correction methods of the current SLM vision system are mostly aimed at correcting some individual image points on the stereoscopic image pair, but lack of distortion evaluation and correction for the overall image point. High-precision requirements for precise 3D coordinate positioning and reconstruction

Danuser (1999) established a high-precision visual model for SLM microscopic image distortion, and systematically discussed the calibration process of parameters, which is very representative, but the model introduces a large number of parameters to fit the distortion, which requires the design of complex Calibration process estimates parameters. If an inappropriate optimization process is selected, the introduction of a large number of parameters will often lead to instability of calibration results. The model proposed by Danuser (1999) is difficult to use and implement.

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