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Method and device for detecting shapes formed by combining arbitrary line segments

A technology of line segment and gradient direction, which is used in image analysis, instrumentation, calculation, etc.

Inactive Publication Date: 2012-10-17
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the n-fold angle criterion adopted by this method is only suitable for regular polygon detection

Method used

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  • Method and device for detecting shapes formed by combining arbitrary line segments
  • Method and device for detecting shapes formed by combining arbitrary line segments
  • Method and device for detecting shapes formed by combining arbitrary line segments

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Example 1 (using the geometric relationship between inscribed circles)

[0038] Figures 2a to 2c A schematic diagram showing the basic process of polygon detection according to this example. in, Figure 2a is the standard template of the shape to be detected; Figure 2b is the input image, Figure 2c is the edge image representing the input image. compared to Figure 2a The standard template shown, Figure 2b There may be scale (zoom) and rotation transformations of the shape to be detected contained in the image shown.

[0039] Edge extraction is to extract the parts with obvious grayscale (or color) changes from the input image, which correspond to the boundaries of objects. If the image is regarded as a two-dimensional function f(x, y), where (x, y) is the pixel coordinate of the image, and f is the grayscale (or color) value of the point, then the edge corresponds to the function f and changes quickly The point of , that is, the function gradient ▽f=f x + ...

example 2

[0069] Example 2 (using the geometric relationship between the inscribed circle and the line segment)

[0070] Example 1 utilizes the geometric relationship among inscribed circles in the shape to be detected for shape inspection. In addition, the geometric relationship between the inscribed circle and the line segment can also be used for shape inspection. In this case, the inscribed circle determined by the combination of some line segments in the shape to be detected can be detected first, and then the existence of these line segments can be verified by using the geometric relationship between the inscribed circle and other line segments. Below to detect Figure 11a and 11b The shape template shown is taken as an example to describe the various steps of this embodiment.

[0071] In the process of shape parameter extraction, such as Figure 11a The arrow shape shown consists of several long and short line segments, such as the long line l 1 to l 5 , and the two short s...

example 3

[0081] Example 3 (using the geometric relationship between the inscribed circle and the curve segment)

[0082] The previous examples 1 and 2 are only for geometric shapes composed of line segments, and the present invention can also be applied to detect shapes containing both line segments (3 and above) and curve segments. In this case, first detect the inscribed circle determined by the line segment combination, and then use the geometric relationship between the inscribed circle and other curve segments to verify whether the curve segment exists. Below to detect Figure 13a and 13b The shape template shown is taken as an example to describe its specific implementation.

[0083] According to this embodiment, during the shape parameter extraction process, Figure 13a and 13b The shape parameter table of the middle template can be shown in Table 3 (hereinafter referred to as the inscribed circle-curve segment table).

[0084] table 3

[0085]

[0086] Among them, P i...

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Abstract

The invention provides a method for detecting shapes formed by combining arbitrary line segments, which comprises the following steps of: extracting image edges from an input image, and calculating gradient directions of edge points; performing vote operations on the calculated edge points to generate a vote image; determining local shape characteristics of a shape to be detected based on the vote image; and comparing parameters of the shape characteristics with shape parameters in a shape parameter table so as to determine the shape included in the input image. According to the method in theinvention, all shapes included in the input image can be automatically detected and recognized.

Description

[0001] Case Description [0002] This application is a divisional application of a Chinese patent application filed on July 17, 2006 with the application number 200610105667.3 and the title of the invention "Method and device for detecting the geometric shape of an image". technical field [0003] The invention relates to a method and device for detecting geometric shapes contained in digital images, which can be applied to technical fields related to shape detection, such as scene recognition in robot navigation, traffic sign recognition in automobile assisted driving, and remote sensing image analysis. Extraction of buildings in translation, etc. Background technique [0004] Shape detection is an important task in machine vision, the following are some existing methods: [0005] US Patent No. 3,069,654, entitled "A Method and Means for Recognizing Complex Patterns," issued to P.V.C. Hough in 1962, discloses a Hough transform method. This method utilizes the relationship...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46G06T7/00
Inventor 吴刚刘伟杰谢晓辉魏强
Owner PANASONIC CORP
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