Abstract: A display control apparatus is equipped with: a captured image acquiring unit 21 that acquires a plurality of captured images of a swing of a golf club; a specific position detecting unit 22 that detects the position of a neck of the golf club included in each of the captured images; a trajectory information generating unit 23 that generates trajectory information of the position of the neck by linking positions of the neck which are detected in each of the captured images in the order that the plurality of captured images are captured; and a display control unit 24 that displays the trajectory information of the position of the neck.

Abstract: A display control apparatus includes: a captured image obtaining unit that obtains captured images of a clubhead of a golf club; a specified position detecting unit that detects positional data of a toe and a heel of the clubhead which are included in the captured images, by inputting the captured images obtained by the captured image obtaining unit into a learned model obtained by machine learning of relationships between multiple captured images of club heads of golf clubs and positional data of toes and heels of the clubheads which are included in the multiple captured images; and a control unit that displays information based on the positional data of the toe and the heel of the clubhead detected by the specified position detecting unit.

Abstract: An image processing device for use with a mark for club head measurement in use for measuring information about a state of a club head of a golf club, the mark being provided on the club head, the image processing device including a mark detector configured to acquire time-series photographic images in which the club head is photographed when the golf club having the club head with the mark for club head measurement is swung, and to detect the mark for club head measurement from each of the photographic images; and a head information generator configured to generate information about a state of the club head, based on the mark for club head measurement detected by the mark detector.

Abstract: A mark for club head measurement in use for measuring information about a state of a club head of a golf club and provided on the golf club includes a central portion formed with a pattern having a lightness lower than the periphery thereof and a peripheral portion formed with a pattern surrounding the periphery of the central portion and having a lightness higher than the central portion.