Abstract: The present invention relates to a method, system, and non-transitory computer-readable recording medium for measuring physical quantities associated with a golf club. According to one aspect of the invention, there is provided a method for measuring physical quantities associated with a golf club, the method comprising the steps of: detecting a first marker and a second marker of different shapes in at least one image of a head of a golf club for which physical quantities are to be measured; and measuring the physical quantities associated with the golf club with reference to properties of a target area specified on the basis of the first marker and the second marker.

Abstract: A method for supporting a virtual golf simulation is provided. The method includes the steps of: determining, with reference to information on a first reference pattern specified in an image photographed by a first photographing module positioned to photograph a moving subject and information on a second reference pattern specified in an image photographed by a second photographing module positioned to photograph a display area where information associated with the subject is displayed, positional relationship between coordinates specified in the first photographing module and coordinates specified in the display area; and determining information on a trajectory of the subject in the display area with reference to the positional relationship.

Abstract: According to one aspect of the invention, there is provided a method for measuring ball spin, the method comprising the steps of: detecting information on a mark appearing in a region corresponding to a ball hit by a user in each of a plurality of images in which the ball is photographed; determining whether it is possible to directly calculate physical quantities related to spin of the ball on the basis of the information on the mark; and when it is determined that it is not possible to directly calculate the physical quantities related to spin of the ball on the basis of the information on the mark, estimating the physical quantities related to spin of the ball on the basis of physical quantities related to at least one of a speed and an angle of the ball or a club hitting the ball.

Abstract: According to one aspect of the present invention, there is provided a method for measuring ball spin, the method comprising the steps of: detecting a plurality of dimples in each of a plurality of images of a ball for which physical quantities are to be measured; and measuring physical quantities related to spin of the ball with reference to a relationship between properties of the plurality of dimples detected in a first image among the plurality of images and properties of the plurality of dimples detected in a second image among the plurality of images.

Abstract: The present invention relates to a method, system, and non-transitory computer-readable recording medium for measuring physical quantities associated with a golf club. According to one aspect of the invention, there is provided a method for measuring physical quantities associated with a golf club, the method comprising the steps of: detecting a first marker and a second marker of different shapes in at least one image of a head of a golf club for which physical quantities are to be measured; and measuring the physical quantities associated with the golf club with reference to properties of a target area specified on the basis of the first marker and the second marker.

Abstract: The present invention relates to a method, system, and non-transitory computer-readable recording medium for supporting photographing of a golf swing. According to one aspect of the invention, there is provided a method for supporting photographing of a golf swing, the method comprising the steps of: (i) determining a user device matched with information on a user who is to perform a golf swing, among a plurality of user devices, with reference to a scenario associated with the golf swing; and (ii) causing a photographing module of the determined user device to photograph the golf swing of the user.

Abstract: The present invention relates to a method, system, and non-transitory computer-readable recording medium for calculating a motion trajectory of a subject. According to one aspect of the invention, there is provided a method for calculating a motion trajectory of a subject, the method comprising the steps of: acquiring at least three images of a subject using one imaging module; and calculating a motion trajectory of the subject with reference to the at least three acquired images, on the basis of each of at least three positions determined by a projection from a viewpoint of the imaging module to the subject on a background, and at least three virtual lines passing through a position where the imaging module is disposed.

Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for determining a region of interest for photographing ball images. According to one aspect of the invention, there is provided a method for determining a region of interest for photographing ball images, comprising the steps of: recognizing a location of a ball whose physical quantity is to be measured, in a state in which shot preparation is completed; and dynamically determining a region of interest to be photographed to acquire images including an appearance of the ball, with reference to the location of the ball and at least one of a predicted moving direction of the ball and a location of at least one camera configured to photograph the ball.

Abstract: The present invention relates to a method, system, and non-transitory computer-readable recording medium for supporting photographing of a golf swing. According to one aspect of the invention, there is provided a method for supporting photographing of a golf swing, the method comprising the steps of: (i) determining a user device matched with information on a user who is to perform a golf swing, among a plurality of user devices, with reference to a scenario associated with the golf swing; and (ii) causing a photographing module of the determined user device to photograph the golf swing of the user.

Abstract: The present invention relates to a method, system, and non-transitory computer-readable recording medium for calculating a motion trajectory of a subject. According to one aspect of the invention, there is provided a method for calculating a motion trajectory of a subject, the method comprising the steps of: acquiring at least three images of a subject using one imaging module; and calculating a motion trajectory of the subject with reference to the at least three acquired images, on the basis of each of at least three positions determined by a projection from a viewpoint of the imaging module to the subject on a background, and at least three virtual lines passing through a position where the imaging module is disposed.

Abstract: According to one aspect of the invention, there is provided a method for measuring ball spin, the method comprising the steps of: detecting information on a mark appearing in a region corresponding to a ball hit by a user in each of a plurality of images in which the ball is photographed; determining whether it is possible to directly calculate physical quantities related to spin of the ball on the basis of the information on the mark; and when it is determined that it is not possible to directly calculate the physical quantities related to spin of the ball on the basis of the information on the mark, estimating the physical quantities related to spin of the ball on the basis of physical quantities related to at least one of a speed and an angle of the ball or a club hitting the ball.

Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for compensating brightness of ball images. According to one aspect of the invention, there is provided a method for compensating brightness of ball images. The method includes calculating photographed brightness distribution of a region corresponding to a ball in each of a plurality of images in which the ball is photographed, and compensating the photographed brightness distribution of the region corresponding to the ball in at least one of the plurality of images, with reference to reference brightness distribution.

Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for measuring ball spin. According to one aspect of the invention, there is provided a method for measuring ball spin, comprising the steps of: detecting at least one mark appearing in a region corresponding to a ball in each of a plurality of images in which the ball is photographed, wherein a physical quantity of the ball is to be measured; recognizing a mark commonly detected over a first image and a second image that are temporally adjacent, with reference to information on properties of the at least one detected mark in each of the plurality of images, and generating a mark sequence including information on the properties of the recognized mark in the first and second images; and measuring a physical quantity related to spin of the ball with reference to the generated mark sequence.

Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for determining a region of interest for photographing ball images. According to one aspect of the invention, there is provided a method for determining a region of interest for photographing ball images, comprising the steps of: recognizing a location of a ball whose physical quantity is to be measured, in a state in which shot preparation is completed; and dynamically determining a region of interest to be photographed to acquire images including an appearance of the ball, with reference to the location of the ball and at least one of a predicted moving direction of the ball and a location of at least one camera configured to photograph the ball.

Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for compensating brightness of ball images. According to one aspect of the invention, there is provided a method for compensating brightness of ball images, comprising the steps of: calculating photographed brightness distribution of a region corresponding to a ball in each of a plurality of images in which the ball is photographed, wherein a physical quantity of the ball is to be measured; and compensating the photographed brightness distribution of the region corresponding to the ball in at least one of the plurality of images, with reference to reference brightness distribution.

Abstract: The present invention relates to a method, system and non-transitory computer-readable recording medium for measuring ball spin. According to one aspect of the invention, there is provided a method for measuring ball spin, comprising the steps of: detecting at least one mark appearing in a region corresponding to a ball in each of a plurality of images in which the ball is photographed, wherein a physical quantity of the ball is to be measured; recognizing a mark commonly detected over a first image and a second image that are temporally adjacent, with reference to information on properties of the at least one detected mark in each of the plurality of images, and generating a mark sequence including information on the properties of the recognized mark in the first and second images; and measuring a physical quantity related to spin of the ball with reference to the generated mark sequence.

Abstract: A method for measuring a physical quantity of an object by using a single light source and a planar sensor unit, and a virtual golf system using the same are provided. According to one aspect of the present invention, there is provided a method for measuring a physical quantity of an object by using a single light source and a planar sensor unit, the method comprising: detecting, by the planar sensor unit, a shadow of the object generated by light emitted from the single light source, wherein the planar sensor unit is disposed on a bottom surface opposed to the single light source; and measuring a physical quantity of the object based on information regarding the shadow.

Abstract: A method for measuring a physical quantity of an object by using a single light source and a planar sensor unit, and a virtual golf system using the same are provided. According to one aspect of the present invention, there is provided a method for measuring a physical quantity of an object by using a single light source and a planar sensor unit, the method comprising: detecting, by the planar sensor unit, a shadow of the object generated by light emitted from the single light source, wherein the planar sensor unit is disposed on a bottom surface opposed to the single light source; and measuring a physical quantity of the object based on information regarding the shadow.