Steel mesh image registration and detection method for large-format optical measurement system

Abstract

The invention discloses a steel mesh image registration and detection method for a large-format optical measurement system, relates to the field of image processing, and solves the problems of low registration and detection precision and high difficulty of an existing image registration and detection method. According to the method, an image registration algorithm is guided by taking a prior design parameter of the large-format optical measurement system as prior information, creatively a star map identification method is introduced into a steel mesh image registration method, and three key parameters including a zooming parameter, a rotation parameter and a translation parameter required to be calculated for steel mesh image registration are separately calculated with different methods, so that a complicated steel mesh image registration problem is simplified. According to the method, the design parameter of the large-format optical measurement system is fully utilized as the prior information of image detection, so that the difficulty in originally complicated steel mesh image registration and detection is lowered; and the star map identification method is introduced into the steel mesh image registration method for the first time and mutually verified with a registration method using Hough transformation and a prior placement angle, so that the success rate of registration is effectively ensured.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a stencil image registration and detection method of a large-format optical measurement system. Background technique [0002] In recent years, the electronics industry has achieved rapid development, the integration and complexity of PCB board circuits are getting higher and higher, and the proportion of SMD components on the circuit board is also increasing. Surface mount technology has become the most common technology in today's electrical equipment technology, and solder paste printing is a key process of surface mount technology, and its quality directly affects the quality and efficiency of PCB board assembly. There are currently three main processes for the production of printed stencils: chemical etching, laser cutting, and electroforming. As the spacing decreases, the size of the holes on the stencil is getting smaller and smaller, and the requirements for the ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low registration and detection accuracy and high difficulty in existing image registration and detection methods, the present invention proposes a large-format optical measurement system stencil image registration and detection method, which effectively combines Registration and detection of large field of view images based on prior information of optical measurement system

Images