Calibrating and aligning method of CCD (Charge-coupled Device) camera

Abstract

The invention relates to a calibrating and aligning method of a CCD (Charge-coupled Device) camera. An aligning platform and two CCD cameras are used in the method; during calibration, a standard sample is fixed on the aligning platform, the aligning platform quantitatively deviates and rotates on the horizontal plane, the two CCD cameras record the coordinate of a Mark point after each motion, and the conversion relation between each coordinate system of the CCD cameras and the coordinate system of the aligning platform is obtained through calculating the change of the Mark point; after the calibration of the two CCD cameras is finished, a product to be processed can be aligned by means of the conversion relation. The method has the advantages that during calibration, the aligning platform is controlled to horizontally move and rotate, the change of the Mark point is respectively captured by using the two CCD cameras, and the conversion relation between the coordinates is obtained through calculation; during alignment, the position coordinate of the Mark point of the product is directly captured by using the two CCD cameras, the actual deviation value is obtained after a series of calculations are carried out, and then, the alignment is carried out; the CCD cameras are not required to be moved in both the calibration and alignment processes, so that the precision loss is reduced, the calibrating and aligning precisions are improved, and the calibrating and aligning speeds are increased.

Description

technical field [0001] The invention relates to the field of machine vision detection, in particular to a method for calibrating and aligning a CCD camera. Background technique [0002] In the solder paste printing and bonding industry, high-precision repeated alignment is often required, especially in recent years, with the hot mobile phone market, higher precision and efficiency requirements have been put forward in glass printing and mobile phone film bonding . The traditional positioning of pins and fixtures has been difficult to meet the process requirements. [0003] People gradually shifted their attention to the automatic alignment of machine vision, and began to use a CCD to move between the two Mark points on the product. During the movement, it is difficult to avoid errors caused by mechanical movement, resulting in the conversion of the three coordinate systems. There is an error, which directly affects the accuracy of calibration and alignment, and it is neces...

AI Technical Summary

Problems solved by technology

The traditional positioning of pins and fixtures has been difficult to meet the process requirements

[0003] People gradually shifted their attention to the automatic alignment of machine vision, and began to use a CCD to move between two Mark points on the product. During the movement, it is difficult to avoid errors caused by mechanical movement, resulting in the conversion of the three coordinate systems. There is an error, which directly affects the accuracy of calibration and alignment, and it is necessary to wait for the CCD to move from one end of the diagonal to the other, and the speed is low

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