Method for acquiring three-dimensional information of moving ball

A three-dimensional information, sphere technology, applied in image data processing, instrumentation, 3D modeling, etc., can solve the problems of adaptability and use that cannot meet technical and tactical analysis

Active Publication Date: 2015-04-08
CHENGDU KINESIOLOGY UNIVERSITY
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  • Abstract
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Problems solved by technology

It is restricted and affected by many aspects such as the competition venue and the accuracy requirements of

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  • Method for acquiring three-dimensional information of moving ball
  • Method for acquiring three-dimensional information of moving ball
  • Method for acquiring three-dimensional information of moving ball

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Embodiment Construction

[0069] The present invention is specifically described below by the examples, the examples are only used to further illustrate the present invention, but can not be interpreted as limiting the protection scope of the present invention, some non-essentials made by those skilled in the art according to the content of the above-mentioned present invention Improvements and adjustments also belong to the protection scope of the present invention.

[0070] 1 basic situation

[0071] According to computer vision theory, the camera loses depth information in the process of projecting the three-dimensional world into a two-dimensional image. Therefore, it is impossible to recover the full 3D information of the scene from 2D images. However, it is still feasible to recover 3D information from a 2D image sequence (single video stream) if the mathematical structure of the problem satisfies some specific constraints. According to different constraints, relevant research results can be di...

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Abstract

The invention discloses a method for acquiring three-dimensional trajectories of balls. The method comprises the steps: acquiring video images, namely acquiring single video stream image information of ball motion through camera and television video signals; constructing a three-dimensional model, namely constructing a projection transformation matrix between a match standard field model and the video images by taking a ball match standard field as a target; acquiring the three-dimensional information, namely acquiring the three-dimensional information of a moving ball in the standard field model in the match video images through the projection transformation matrix. According to the method, information on the speed, arc and placement of the ball can be acquired from single video streams; according to the method, the three-dimensional trajectories of the balls can be acquired, and technical and tactical parameters, such as stroking speed, bending radian of a three-dimensional trajectory, over-net height, flight distance and placement, of a table tennis ball can be further calculated; analysis on technical and tactical information can help coaches and athletes to improve the technical and tactical level, and thus, the comprehensive competitiveness of ball match events of our country is improved.

Description

technical field [0001] The invention belongs to the technical field of computer vision and image processing, in particular to the technical field of image processing for sports game analysis, and in particular to a method for obtaining balls such as table tennis, tennis balls, volleyballs, basketballs, footballs, etc., which are only affected by the gravity of the earth and move in a parabola The method of 3D trajectory and other information. Background technique [0002] Ball sports mainly refer to table tennis, badminton, tennis, volleyball, and football. Their common feature is that they compete against each other on a standard court, and the ball speed is high in the game. At present, in order to improve the technical and tactical level of sports events, the use of computer vision and image processing technology for technical analysis is constantly being explored in the research of sports technology. [0003] Taking table tennis as an example, table tennis is a traditio...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/20G06T17/00
CPCG06T7/20G06T2207/30224G06T2207/30241
Inventor 沈乐君
Owner CHENGDU KINESIOLOGY UNIVERSITY
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