Calibrating method of control-point-free camera measurement system in field of view based on total station

Abstract

The invention relates to a calibrating method of a control-point-free camera measurement system in the field of view in camera measurement. The calibrating method comprises the following steps of: linking a video camera and a total station fixedly together; establishing a coordinate system of the total station by taking a measurement site as an origin of a coordinate, and calibrating the internal and external parameters of the coordinate system of the total station of the video camera at a place with control point labels; then transferring a fixed linked body of the video camera and the total station to a measurement position to be installed fixedly, and dotting and measuring the corresponding relationship between the coordinate system of the total station at the state and a measurement coordinate system by utilizing the total station; and finally converting the internal and external parameters of the video camera into the measurement coordinate system, so that the internal and external parameters of the video camera under the measurement coordinate system are calibrated for subsequent measurement. The method can be used for separating the calibrating position and the measurement position, can be used for calibrating the video camera of multiple special conditions of sea, air and the like, and widens the application range of the calibrating method.

Description

technical field [0001] The invention relates to a method for calibrating parameters such as the position of the optical center and the direction of the optical axis of the camera measurement system when there is no control point with a known coordinate position in the field of view of the camera measurement system during the camera measurement process, such as: facing the sky, facing the sea, etc. . Background technique [0002] In general, when the camera measurement method is used to measure the spatial position of the target, it is necessary to calibrate the internal and external parameters of the camera measurement system, such as the focal length, the position of the optical center, and the direction of the optical axis. [0003] For photogrammetry with a fixed field of view, the camera is generally fixed at the measurement position, enough marker points are arranged within the camera’s field of view, and then the spatial coordinate positions of each point are measured,...

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Problems solved by technology

[0004] However, in actual operation, we may not be able to arrange enough control points in the measurement field of view, and in some cases even cannot arrange control points, such as the situation of sea and air measurement

In this case, it is generally necessary to use a camera measurement system with a precision angle measuring turntable for measurement, and the control point calibration method will not work

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