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Quick edge locating method of sub pixel image of target celestial body for deep space exploration autonomous navigation

A target celestial body, autonomous navigation technology, applied in the interpretation of photos and other directions

Active Publication Date: 2015-07-08
BEIJING INST OF CONTROL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a fast edge positioning method for the sub-pixel image of the target celestial body for autonomous navigation in deep space exploration, and to solve the problem of fast and high speed of the center vector of the target celestial body in deep space exploration. Accuracy Measurement Issues

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  • Quick edge locating method of sub pixel image of target celestial body for deep space exploration autonomous navigation
  • Quick edge locating method of sub pixel image of target celestial body for deep space exploration autonomous navigation
  • Quick edge locating method of sub pixel image of target celestial body for deep space exploration autonomous navigation

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, the edge point extraction after image threshold segmentation (the intersection point of each horizontal and vertical tangent line with the target is an edge point, each tangent line corresponds to 2 edge points, and d is the interval between tangent lines)

[0028] Such as figure 2 Shown, the specific implementation steps of the present invention are as follows:

[0029] (1) Edge extraction of the target celestial body image, use the threshold method to segment the target celestial body image to obtain the target imaging interval (x1~x2, y1~y2), and start the horizontal tangent line from x1, the first tangent line is x1, and the second tangent line It is x1+d to x2; the vertical tangent starts from y1, and the vertical tangent is carried out according to the interval d, and the interval d is generally selec...

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Abstract

The invention discloses a quick edge locating method of a sub pixel image of a target celestial body for deep space exploration autonomous navigation. The quick edge locating method comprises the following steps of: extracting the edge of the image of the target celestial body; figuring up a center position of an extracted target imaging region so as to obtain polar coordinates of an edge point of the target celestial body; carrying out gradient computation on the polar coordinates; and figuring up an output according to an optimal sub pixel position obtained by a gradient computation result. The quick edge locating method disclosed by the invention solves the problem of quick high-precision measurement of the center position of the target celestial body for deep space exploration.

Description

technical field [0001] The invention relates to a fast edge positioning method of a sub-pixel image of a target celestial body for autonomous navigation of deep space exploration, which belongs to a space optical imaging sensor. Background technique [0002] In deep space exploration, it is necessary to take pictures of other celestial targets such as Mars and determine the center position of the target celestial body. Inheriting the image processing algorithm of the ultraviolet moon sensor, it uses the fitting of the edge points of the target celestial body image to achieve accurate center positioning, so the positioning accuracy of the edge points will directly affect the determination accuracy of the center position of the target celestial body. Therefore, one of the ways to improve the accuracy of deep space detection sensors is to improve the positioning accuracy of edge points. Literature 1, Liu Lishuang, Zhang Yao, Lu Huiqing, Fast sub-pixel edge detection method for...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/04
Inventor 王立梁潇吴奋陟王大轶黄翔宇
Owner BEIJING INST OF CONTROL ENG