Method and system for automatically extracting position and profile of mark point in image

A technology for automatic extraction and marking points, applied in the field of image processing, can solve the problems that the accuracy and correctness need to be improved, the method of marking points cannot be completely removed, etc., to achieve the effect of improving accuracy and stability

Active Publication Date: 2016-12-07
ZG TECH CO LTD
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Problems solved by technology

[0003] Most of the current methods for extracting marker points in images cannot completely remove the interference such as laser lines or o

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  • Method and system for automatically extracting position and profile of mark point in image
  • Method and system for automatically extracting position and profile of mark point in image
  • Method and system for automatically extracting position and profile of mark point in image

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[0068] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0069] Such as figure 1 As shown, it is a flowchart of a method for automatically extracting the position and contour of a circular mark in an image according to the present invention, which includes the following steps:

[0070] Step 1. Obtain the original image;

[0071] Paste visual landmark points on the surface of the object, the landmark points are circular; the object is photographed by setting up a camera or other equipment to obtain the original image with the landmark points, such as figure 2 Shown.

[0072] Step 2: Perform median filter processing on the original image;

[0073] An image window with a template size of n*n is selected for median filtering, and the processing formula is shown in formula (1). Traverse the...

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Abstract

The invention relates to a method and a system for automatically extracting the position and profile of a mark point in an image. The method comprises the steps of obtaining an original image; performing median filtering processing on the original image; performing ellipse fitting processing on the mark point subjected to the filtering processing to obtain a preliminary extraction result; converting image point coordinates of points of an ellipse boundary of the preliminary extraction result into polar coordinates; and uniformly selecting the plurality of the points on the ellipse boundary to perform accurate extraction processing, and finally obtaining accurate data of the mark point. According to the method and the system, a mark point area in the image can be extracted automatically and more accurately based on preliminary extraction processing through accurate extraction processing, and a parameter equation of the mark point area is fitted out; and the extracted profile of the mark point can reach the sub-pixel level, so that the accuracy and stability of an existing method are greatly improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and system for automatically extracting the position and outline of circular marker points in an image. Background technique [0002] Using stereo vision for 3D reconstruction is an important means of close-range 3D reconstruction. According to the image point coordinates of the corresponding points with the same name in the left and right images with known internal and external orientation elements and the internal and external orientation elements of the image, the three-dimensional coordinates of the changed point can be obtained by using the principle of forward intersection. In order to facilitate the search for corresponding points with the same name, the method of pasting visual marker points on the surface of the object is usually used. This method is easy to operate and requires less calculation. To be accurate and reliable. Since the imaging of circular landma...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/60
CPCG06T2207/20032
Inventor 郑顺义王晓南叶剑锋张猛赵丽科
Owner ZG TECH CO LTD
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