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A Rectangular Pin Chip Positioning Method Based on Improved Deformable Parts Model

A technology of deformed components and positioning method, applied in the field of image processing, can solve the problem of inability to accurately locate a rectangular pin chip with deformation, etc., and achieve the effect of strong anti-interference ability

Active Publication Date: 2021-06-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is: to solve the problem that the positioning method in the prior art cannot accurately locate the rectangular lead chip with deformation, a method for positioning the rectangular lead chip based on the improved deformable component model is proposed

Method used

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  • A Rectangular Pin Chip Positioning Method Based on Improved Deformable Parts Model
  • A Rectangular Pin Chip Positioning Method Based on Improved Deformable Parts Model
  • A Rectangular Pin Chip Positioning Method Based on Improved Deformable Parts Model

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specific Embodiment approach 1

[0062] Specific implementation mode one: refer to figure 1 Specifically explaining this embodiment, a rectangular pin chip positioning method based on an improved deformable component model described in this embodiment includes the following steps:

[0063] Step 1: Obtain the image of the chip area;

[0064] Step 2: Extract the pin area in the image to obtain the potential pin area for preliminary screening;

[0065] Step 3: First, determine multiple detection positions with rotation angles in the chip image through the sliding window method with rotation angles, and then determine the ideal position of the pins according to the detection positions with rotation angles, and then determine the ideal position of the pins according to the ideal position of the pins The position and the initially screened potential pin area are judged one by one whether they overlap. If they overlap, the area is a deformation instance of the corresponding pin model, and then the score of the pin ...

Embodiment

[0133] In order to verify the positioning method proposed by the present invention, the inventor collected data collected by various grouped rectangular pin chips in this section, including four chips of SOT23-4, SOP16, QFP32 and QFP114, wherein SOT32-4 and SOP16 It is a dual-column pin chip, and QFP32 and QFP144 are four-column pin chips; on the other hand, the number of pins of the four chips ranges from 4 to 144, and the number varies greatly. To sum up, the four chips selected in this section basically cover most of the characteristics of rectangular pin chips. 20 images were collected under various lighting conditions, so there are 800 test samples in total.

[0134] In the experiment, these test samples are processed with the chip positioning algorithm discussed in this chapter, and the chip positions obtained by the algorithm are compared with the results obtained by the Samsung SM482 machine. As shown in Table 1-1, after calculating the difference between the algorith...

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Abstract

A method for locating chips with rectangular pins based on an improved deformable component model, which relates to the technical field of image processing, aims at the problem that the positioning methods in the prior art cannot accurately locate chips with deformed rectangular pins, including step 1 : Obtain the image of the chip area; Step 2: Extract the pin area in the image to obtain the potential pin area for preliminary screening; Step 3: Get the score of the overall model of the chip, and then search for the optimal deformation at the local position; Step 4: According to the optimal deformation of the local position obtained in step 3 and the score of the overall model of the chip, the local maximum value is judged by the non-maximization suppression method, and then the position of the chip in the picture is judged. The invention firstly extracts the potential pin area and its parameters from the chip picture, then searches the chip deformation on the local position, and finally searches the chip deformation on the whole picture. The invention can accurately locate the chip with deformed rectangular pins, and has strong anti-interference ability.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a rectangular pin chip positioning method based on an improved deformable component model. Background technique [0002] With the miniaturization of electronic components, machine vision inspection technology has been widely used in various fields. For the chip testing industry, due to the high integration of chips, the spacing between chips is getting smaller and smaller, the difficulty of center detection and pin positioning is getting more and more difficult, and the accuracy requirements are getting higher and higher. Accurate positioning is very important, and using a high-precision technology to locate the chip pins is an urgent problem to be solved. The existing positioning method for lead chips cannot accurately locate deformed rectangular lead chips. Contents of the invention [0003] The object of the present invention is to propose a method for positioning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/77
CPCG06T2207/20016G06T2207/30148G06T7/77
Inventor 孙昊于兴虎高会军
Owner HARBIN INST OF TECH
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