Golf Ball Spin Measurement Using Mark Sequence Analysis
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Solution Overview
Problem
Conventional virtual golf systems lack effective methods for accurately measuring golf ball spin and compensating for camera angle variations, which affects the precision of physical quantity measurements.
Innovation Solution
A method and system that detect and analyze mark sequences in high-speed camera images to measure golf ball spin, compensating for camera angle changes by generating a mark sequence and using it to calculate spin rate and direction, while also compensating for brightness variations to enhance image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image processing techniques are used to photograph a moving golf ball, then the imaging process is simple, but measurement precision of ball spin is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-processing images to compensate for brightness variations before mark detection. The system calculates brightness compensation values based on image characteristics and applies these compensations in advance, ensuring that mark sequences can be accurately detected without being affected by lighting conditions. This preliminary brightness compensation enables precise spin measurement while maintaining a manageable processing workflow.
Solution Approach 2:
The patent introduces mark sequences as an intermediary element between the golf ball and the measurement system. By detecting and tracking specific marks on the ball across multiple images, the system converts the complex task of direct spin measurement into a simpler mark trajectory analysis problem. The mark sequences serve as mediators that translate ball motion into measurable data, improving precision without requiring overly complex direct measurement apparatus.
2Measurement precision
If camera angle variations are not compensated, then the processing is simpler, but measurement precision deteriorates due to angle changes
Solution Approach 1:
The patent implements feedback by continuously monitoring the camera angle during image capture and using this information to adjust the mark sequence detection and spin calculation processes. The system feeds back angle variation data to the measurement algorithm, allowing real-time compensation for perspective changes. This feedback mechanism ensures accurate spin rate and direction measurement even when the camera angle varies during ball motion.
3Measurement precision
If brightness variations in images are not compensated, then the processing is faster, but mark detection accuracy decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating brightness compensation values based on image characteristics before mark detection. The system analyzes image brightness distribution, determines compensation parameters, and applies corrections in advance, ensuring that mark sequences are detected from brightness-compensated images. This approach improves mark detection accuracy without requiring iterative adjustments during the main processing pipeline.
Data Source
AI summary
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.