Method and device for detecting deviation degree of camera image plane in vertical optical axis direction

Abstract

The invention discloses a method and device for detecting the deviation degree of a camera image plane in a vertical optical axis direction, wherein the method and device are convenient for detectionand high in precision. The method comprises the steps: A, coaxial debugging; B, light source irradiation; C, light and shadow collection and capturing; D, parallelism measurement and calculation. Thedetection method employs the geometric projection and central symmetry principle, achieves the absolute measurement of a deviation index of the camera image plane and the center of a lens interface under the condition that a tested camera is not connected with the lens, and gives a high-precision quantitative index; there is no need of a lens in the whole detection process, so that a measurement result error caused by the deviation of the lens is avoided; the obtained measurement result is the detection of the absolute deviation of the camera, and the precision of the obtained detection resultis high; the detection process is fast and convenient, and the detection efficiency and accuracy are greatly improved while a complex system detection method is simplified.

Description

technical field [0001] The invention belongs to the technical field of camera focusing accuracy detection, and in particular relates to a method and a device for detecting the deviation degree of a camera image plane perpendicular to the optical axis direction which are easy to operate. Background technique [0002] With the large-scale use of industrial cameras in the field of machine vision, the requirements for the consistency of camera imaging continue to increase. In the process of using industrial cameras, the imaging consistency of the same camera is a very important criterion, and the deviation of the camera image plane from the vertical optical axis, that is, the offset distance between the center of the image plane of the camera image sensor and the center of the lens interface is the key to ensure the camera imaging One of the important indicators of consistency. At present, this indicator is basically determined by machining accuracy and assembly, and most camer...

AI Technical Summary

Problems solved by technology

At present, this indicator is basically determined by machining accuracy and assembly, and most camera manufacturers have not tested this indicator, resulting in a large deviation in the imaging quality of the same camera due to the discreteness of this indicator

The existing detection method is complex and requires multiple calibration links, such as the style and specification of the calibration plate, the positioning of the camera, and the precision control of the entire detection device; the second is that this method only obtains relative results, that is, the detection of the degree of dispersion. If the detection device is adjusted or changed, it needs to be re-calibrated; the third is to add factors that affect the measurement results of the camera, such as the imaging accuracy of the lens itself

Images