Method for calibrating camera shooting or photographing device

Abstract

The invention discloses a method for calibrating a camera shooting or photographing device, and belongs to the technical field of measurements. The method comprises the following steps of: presetting a position relationship between a calibration target and the camera shooting or photographing device; performing iterative computations according to coordinates of a preselected calibration point on the calibration target and a matching point of the calibration point on an actual image plane of the camera shooting or photographing device by utilizing an ideal lens imaging model, a lens distortion model and a collimation model; and calibrating the parameters of the camera shooting or photographing device. By the method, the position relationship between the calibration target and the camera shooting or photographing device is preset, the displacement calculation process of the optical center of the lens of the camera shooting or photographing device relative to the origin of coordinates of the plane of the calibration target is simplified, so that the whole calibration process is high-efficiency; and moreover, by the method, the problem that the parameters of the device are calibrated when the focusing is inaccurate can be effectively solved, the target pattern is only required to be photographed at one time, and the calibration efficiency is improved. In addition, the three-dimensional distance under the out-of-focus condition can be effectively measured.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a calibration method of an imaging or photographing device, which can be applied to geometric calibration of images captured by cameras or cameras, camera calibration in computer stereo vision, and the like. Background technique [0002] The camera or camera lens is a non-ideal optical system, which is affected by the distortion parameters of the lens itself. When the image is captured by the camera or video camera, it not only affects the visual effect of the image, but sometimes affects the camera calibration accuracy in computer stereo vision. [0003] For a binocular stereo vision sensor system, the optical axes of the two camera lenses are usually non-parallel after the system is assembled (such as figure 1 shown as optical axis 102 and optical axis 103), the non-parallel optical axes will cause the imaging plane to shift (eg figure 1 The deviation of the ac...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects and deficiencies of the prior art, provide a calibration method for a binocular stereo vision sensor system, and solve the problem of tailing caused by inaccurate focus in the prior art (thus affecting the center of the feature point The extraction) and the calibration process need to move the calibration position multiple times, which makes the calibration efficiency low

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