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A Method of Locating Fiducial Marks Based on Point Matching

A positioning method and point matching technology, applied in the field of image processing, can solve problems such as low versatility, real-time positioning, and unsatisfactory positioning accuracy against illumination robustness, and achieve the effect of high stability and stable performance

Active Publication Date: 2019-02-22
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

However, the generality of the existing Mark point positioning method is not high, and the real-time positioning, positioning accuracy and robustness to illumination are not ideal.

Method used

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  • A Method of Locating Fiducial Marks Based on Point Matching
  • A Method of Locating Fiducial Marks Based on Point Matching
  • A Method of Locating Fiducial Marks Based on Point Matching

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specific Embodiment approach 1

[0050] Specific implementation mode one: combine figure 1 Describe this embodiment, a method for locating reference markers based on point matching described in this embodiment, including:

[0051] Step 1: Obtain key vertices representing the shape of Mark points offline;

[0052] Step 2: Obtain the picture of the Mark point to be located online, detect the corner point or center point, and obtain the corner point or center point of the Mark point;

[0053] Step 3: Aggregate the corner points detected in step 2, and extract sub-pixel corner points;

[0054]Step 4: Establish a space transformation function that transforms the sub-pixel corner points extracted in step 3 or the center point obtained in step 2 to the corresponding key vertices obtained in step 1, and use the registration method to obtain the parameters of the established space transformation function, Namely: Obtain the Mark point positioning information of the image of the Mark point to be positioned.

[0055]...

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Abstract

The invention provides a datum mark positioning method based on point matching which has the advantages of high positioning accuracy, good real-time performance and high robustness to light, and belongs to the technical field of image processing. The method comprises the following steps: S1, acquiring key vertexes characterizing the shape of a Mark point offline; S2, acquiring a picture of a to-be-positioned Mark point online, and performing corner or center detection to get the corners or center of the Mark point; S3, aggregating the corners detected in S2, and extracting sub-pixel corners; and S4, building a space transformation function of transformation from the sub-pixel corners extracted in S3 or the center obtained in S2 to the corresponding key vertexes obtained in S1, and calculating the parameters of the built space transformation function by use of a registration method, namely, getting the Mark point positioning information of the picture of the to-be-positioned Mark point. The method is used to position a Mark point of a PCB in SMT (Surface Mount Technology).

Description

technical field [0001] The invention relates to a positioning method, in particular to a reference mark positioning method based on point matching, and belongs to the technical field of image processing. Background technique [0002] The wide application of SMT (Surface Mount Technology) has greatly improved the automation of the electronics industry, reduced labor costs, and increased production efficiency. The maturity of SMT technology marks the competitiveness of the electronics industry. As two important indicators, placement accuracy and speed determine the advanced level of this technology. Most of the positioning in SMT is based on Mark points, so the visual positioning accuracy and speed of Mark points play a decisive role in SMT technology. [0003] The existing Mark point localization methods mainly focus on using binary image-based and edge-based methods. However, the generality of the existing Mark point positioning method is not high, and the real-time posit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/33
CPCG06T7/0004
Inventor 高会军杨宪强白立飞孙昊刘鑫许超张智浩
Owner HARBIN INST OF TECH
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