Multi-camera calibration device and method

Abstract

The invention discloses a multi-camera calibration device and a multi-camera calibration method. The device comprises a plurality of cameras; a camera fixing bracket used for fixedly mounting all thecameras; a calibration plate used for providing a reference coordinate system; and a control unit connected with all the cameras and is used for calibrating all the cameras by adopting the calibrationplate. According to the invention, the plurality of cameras are calibrated by adopting the black-and-white grid calibration plate with marks, so that the high-precision calibration of the plurality of cameras can be realized, and the high-precision joint alignment of large-size products is further realized.

Description

technical field [0001] The invention relates to the technical field of industrial automation, in particular to a multi-camera calibration device and calibration method applied to large-size inkjet printers requiring high-precision alignment. Background technique [0002] In inkjet printing technology, the printing position on the product is fixed each time, and its precision may be required to reach the micron level. Since the feeding cannot always be at the same position, at this time, high-precision alignment is generally achieved through CCD alignment. Usually, a high-resolution camera can meet the alignment accuracy requirements, and the whole mechanism is relatively simple, requiring only one camera, camera fixing block and light source fixing bracket. [0003] Since the maximum resolution commonly used in industrial CCDs is 20 million, if the size of a single pixel is 10 microns, then its field of view must be guaranteed to be within 55 mm, and the field of view is ge...

AI Technical Summary

Problems solved by technology

Of course, it is also possible to calibrate the internal parameters of the camera to obtain the distortion of the camera lens, thereby correcting its distortion, but this correction is only to correct the image rigidly through mathematical calculation, and its image quality will be affected

[0004] Due to the alignment of a single camera, the distortion rate of the lens is relatively high. If the working distance requirement is relatively low and the field of view is relatively large, then a wide-angle lens is bound to be selected, which will lead to serious radial distortion of the image and directly cause Inaccurate alignment

Due to the limitation of camera resolution, the alignment accuracy of a single camera cannot meet the requirements; and due to the limitation of alignment accuracy, the alignment of large-sized products cannot be achieved, so the alignment of a single camera often cannot achieve the high accuracy of large-sized products. Precision Alignment

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