Video Target Position Interpolation for Missing Frames
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Solution Overview
Problem
Current image processing techniques for estimating the spin condition of a pitched ball from video fail to interpolate positional information when it is missing in frames, leading to incomplete data sets.
Innovation Solution
An information interpolation device and method that acquires target information, determines a starting frame based on validity indicators, and interpolates positional information for frames without target data using adjacent frames' data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If video processing is used to estimate spin condition without Doppler radar systems, then equipment cost and installation restrictions are reduced, but positional information may be missing in some frames leading to incomplete data
Solution Approach 1:
The patent applies preliminary action by performing interpolation of positional information before spin condition estimation. The system identifies frames with missing positional information and interpolates the data from adjacent frames beforehand, ensuring complete data is available for subsequent spin analysis. This preprocessing step resolves the information loss issue while maintaining the cost advantages of video-based systems.
2Measurement precision
If frame-by-frame target identification is performed to acquire positional information, then measurement capability is improved, but data gaps occur when targets are not detected in certain frames
Solution Approach 1:
The patent uses interpolation as an intermediary process between frame detection and spin analysis. When positional information is missing in certain frames, the system calculates intermediate values based on data from adjacent frames with valid measurements. This intermediary step ensures data continuity and reliability while preserving the precision of actual measurements.
3Measurement precision
If preprocessing is performed to identify targets in each frame, then spin condition estimation accuracy is improved, but processing time increases when interpolation is needed
Solution Approach 1:
The patent applies partial action by performing interpolation only for frames where positional information is missing, rather than processing all frames uniformly. The system selectively identifies problematic frames and applies interpolation only where needed, minimizing additional processing time while ensuring accuracy for the spin condition estimation.
Data Source
AI summary
A technique for interpolating positional information of a target in an image of a frame in which positional information of the target has not been acquired. An information interpolation device includes: a target information acquisition unit 4 acquiring target information that is information related to a target in an image of each frame composing an input video; an indicator determination unit 5 determining, based on the target information, an indicator indicating validity as a starting frame for each frame, the starting frame starting predetermined image processing on a target; a starting frame determination unit 6 determining a starting frame based on the determined indicator; and a target information interpolation unit 7 interpolating, when a frame in which positional information of a target is not included in target information exists among frames within a predetermined number from the determined starting frame, positional information of the target of the frame that does not include the positional information of the target by using positional information of the target included in target information of a frame other than the frame that does not include the positional information of the target.