Steel mesh image automatic registration method and steel mesh image automatic registration system of surface mounting technology
A surface mount technology and automatic registration technology, applied in image analysis, image enhancement, image data processing, etc., can solve the problems of insufficient intelligence, low efficiency, poor applicability, etc., and achieve fast contour extraction, high success rate, The effect of reducing the amount of computation and complexity
Active Publication Date: 2017-06-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
This solves the technical problems of low efficiency, poor applicability and insufficient intelligence of the existing stencil registration and defect detection methods
Method used
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[0065] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0066] Such as figure 1 As shown, the method flow of the present invention is as follows:
[0067] (1) Read the stencil processing Gerber file, analyze the hole position, shape and size and other information to obtain the stencil outline vector file and display it as figure 2 Shown
[0068] Obtain the minimum bounding rectangle of the entire file area and calculate the coordinates of the four vertices of...
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The invention discloses a steel mesh image automatic registration method of a surface mounting technology, and belongs to the image processing and optical measurement field. By using a characteristic of a distance between an image bounding rectangle and a registration point being not affected by arbitrary displacement positions and arbitrary displacement angles of a steel mesh, a design registration point and a design lattice diagram and a steel mesh finished product image are used for the registration. During the registration, calculation conversion of translation, rotation, and zoom parameters required by the calculation of the affine transformation registration of the steel mesh and the design image is converted into calculation of a transmission characteristic matrix, and after the registration, a registration automatic test is carried out, and after the registration fails, secondary registration is carried out. The invention also discloses the steel mesh image automatic registration system of the surface mounting technology. The technical scheme provided by the invention is not affected by the displacement positions and the displacement angles of the registration products, and therefore the steel mesh image automatic registration method and the steel mesh image automatic registration system have advantages of accurate registration, fast, simple, high-efficiency operation, and ability of improving registration success rate effectively.
Description
Technical field [0001] The invention belongs to the field of image processing and optical measurement, and more specifically, relates to a method for automatic registration of steel mesh images based on surface mounting technology. Background technique [0002] With the rapid development and advancement of electronic technology, the integration and complexity of PCB circuits are also increasing. SMD components account for 50% to 90% of the total number of components on the circuit board. Surface mount technology (SMT) is One of the most popular technologies and processes in the electronics assembly industry. The stencil is a special SMT mold made by laser cutting. Its main function is to help the deposition of solder paste. The purpose is to transfer an accurate amount of solder paste to an accurate position on the empty PCB. At present, with the development of the processing technology and the electronics industry getting better and better, the size of the openings on the SMT s...
Claims
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Login to View More IPC IPC(8): G06T7/00G06T7/33G06T7/136
CPCG06T7/001G06T2207/30141
Inventor 夏珉杨克成李微章琦
Owner HUAZHONG UNIV OF SCI & TECH