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Vertex-based rectangular-pin element locating method

一种引脚元件、定位方法的技术，应用在计算机零部件、图像分析、图像增强等方向，能够解决定位鲁棒性弱、实时性低、精度低等问题，达到增强鲁棒性、提高处理速度、提高定位精度的效果

Active Publication Date: 2018-04-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of weak robustness, low precision, poor versatility and low real-time performance of the existing patch type rectangular pin component online positioning algorithm, and propose a rectangular pin based on vertex (key) Component positioning method

Method used

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  • Vertex-based rectangular-pin element locating method
  • Vertex-based rectangular-pin element locating method
  • Vertex-based rectangular-pin element locating method

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specific Embodiment approach 1

[0051] Specific embodiment one: a kind of vertex-based rectangular lead element positioning method comprises the following steps:

[0052] Step 1: using image processing method or component database (datasheet) to obtain model component information, the component information is component size, pin number, pin length, pin width and pin location;

[0053] Step 2: Divide the components into two categories according to the pin layout; the first category is that the pins are distributed on the top, bottom or left and right sides of the component, and the second category is that the pins are distributed on the top, bottom, left, and right sides of the component;

[0054] The key vertices defining the model component pins are two vertices on each rectangular pin away from the chip body ( figure 1 — image 3 All the solid black circles in the center), recorded as V=[v 1 ,v 2 ,...,v M ] T ,in Indicates the position of the i-th key vertex, which is a two-dimensional column vector; ...

specific Embodiment approach 2

[0064] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: in the step three, F mi Specifically:

[0065] f mi =[||v 1 -v i || 2 ,...,||v M -v i || 2 ]

[0066] Where||·|| 2 is the 2-norm of the vector.

[0067] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0068] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the real image of the actual component is obtained online in the step four, the component image is processed by the FAST method, and the specific process of extracting the feature point is as follows:

[0069] According to engineering experience, the difference between the gray value of the chip pins of the actual chip and the gray value of the background is more than 100. In order to obtain strong feature points, the gray threshold value can be set to 120 by using the FAST-9 method. The gray threshold value of the actual chip is The difference between the gray value of the chip pins and the background gray value.

[0070] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a vertex-based rectangular-pin element locating method, and aims to solve problems of low robustness, low precision, poor generality and low real-time performance of online locating algorithms of patch-type rectangular-pin elements. The method includes: 1, obtaining model element information; 2, dividing elements into two types; 3, extracting a feature descriptor of each vertex of model element pins; 4, acquiring a real image of an element, and extracting feature points; 5, extracting respective included angles between two straight lines, where each feature point is located, and a positive direction of an X axis; 6, obtaining an element rotation angle; 7, obtaining precise feature point locations; 8, calculating precise feature point locations corresponding to allvertices; 9, obtaining vertex feature descriptors of actual element pins; 10, determining weight values of feature point pairs corresponding to the model element vertices and the actual element vertices; and 11, calculating a final location of a chip center and a precise rotation angle of a chip. The method is used in the field of chip surface detection.

Description

technical field [0001] The invention relates to a general positioning method for multi-type rectangular pin chip components, and belongs to the technical field of high-speed and high-precision visual detection surface mounting of chip mounters. Background technique [0002] The component package structure of the patch type rectangular pin chip is rectangular, and the I / O pins of the chip component are many (small in size), which is suitable for large-scale arrangement and plate making of printed circuit boards, and is widely used in the processing and production of integrated circuits . The high integration of chip components on the printed circuit board puts forward very strict requirements on the mounting and placement of components. [0003] Mounter is a production platform for placing non-lead or short-lead surface mount components on the surface of printed circuit boards with high speed and high precision. It is a high-end equipment integrating opto-mechanical electron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/73G06T7/33G06T7/13G06V10/764
CPCG06T7/73G06T7/13G06T7/33G06T2207/20164G06T2207/30141G06T2207/30148G06V10/242G06V10/462G06V2201/06G06V10/764G06T7/001G06T7/11G06T7/337G06T7/74G06F18/24G06F2218/08
Inventor 高会军杨宪强许超白立飞
Owner HARBIN INST OF TECH
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