Method for matching generalized Hough transform image based on local invariant geometrical characteristics

A matching method and image technology, applied in the field of image matching, can solve problems such as affecting the accuracy of the algorithm, and achieve the effects of reducing memory requirements, good adaptability, and good robustness

Active Publication Date: 2013-12-18
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology

However, when there is a small error in the gradient operator, or when there are multiple targets on the target image, the second edge point will be wrongly found, which will seriously affect the accuracy of the algorithm

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  • Method for matching generalized Hough transform image based on local invariant geometrical characteristics
  • Method for matching generalized Hough transform image based on local invariant geometrical characteristics
  • Method for matching generalized Hough transform image based on local invariant geometrical characteristics

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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The description herein is only used to explain the present invention when referring to specific examples, and does not limit the present invention.

[0036] The generalized Hough transform image matching method based on local invariant geometric features in this embodiment is divided into two parts: an offline stage and an online stage.

[0037] In the offline stage, the templates are preprocessed first. Specific steps are as follows:

[0038] A1). Edge extraction is performed on the template image to obtain the edge point P of the template image i (i=1,2,3.N.,) where N is the number of template image edge points, and obtain the template image edge point center P according to the obtained edge points r .

[0039] There are many mature methods for image edge extr...

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Abstract

The invention discloses a method for matching a generalized Hough transform image based on local invariant geometrical characteristics to achieve the purpose of matching a target image with any rotating angle. The method is characterized by comprising the step of preprocessing a template image and the step of matching the target image through the processed result of the template image. The step of processing the template image comprises the step of extracting all edge points of the image and establishing an edge point matching characteristic relation. When the matching process is carried out on the target image, the edge points of the target image are extracted, the extracted image is matched through the established edge point matching characteristic relation, accordingly, the matching position points and the corresponding rotation angles are acquired, and the target image is matched. A traditional Hough transform is improved, an improved reference table is established, the target image rotated by any angles can be matched, and a very high matching speed and matching precision are achieved.

Description

technical field [0001] The invention belongs to the technical field of machine vision, and more specifically relates to an image matching method. Background technique [0002] In the integrated circuit (IC) manufacturing industry, picking and placing chips at high speed and high precision is a key operation that affects production efficiency. Picking and placing chips depends on high-speed, high-precision positioning of chips. With the rapid development of machine vision technology, it shows excellent superiority in target positioning, so machine vision technology is widely used in IC manufacturing industry. The machine vision system applied to chip positioning is mainly composed of light source, camera, and image matching module. Adjust the light source to the appropriate brightness, collect the image of the chip through the camera, the image acquisition board transmits the image to the industrial computer, calculate the position and rotation angle of the chip through the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T3/60
Inventor 杨华尹周平王瑜辉魏飞龙张步阳
Owner HUAZHONG UNIV OF SCI & TECH
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