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After determining the hitter's skeletal point, including the hitter's shoulders, the waist, and knees, the next step is to identify the timing to draw the strike zone, and this step is crucial.
Many hitters tend to lift their front knee while hitting, which will affect the strike zone by the baseball rules. If we choose hitter-hit timing to generate a strike zone, this can result in a narrower strike zone, making it more challenging to determine strikes accurately. The differences in knee positioning can lead to variations in drawing the strike zone. This inconsistency could cause unfairness in the game. Therefore, we need to determine which timing is more suitable based on their standing position and the lowest point of their knee.
In this research, we divide the process before the pitcher releases the baseball into two key moments, namely, the Release Frame and the Prepare Frame. The Release Frame is when the pitcher is about to release or has just released the baseball, and the hitter has already started preparing for the hitting. We use YOLOv7 to determine the exact timing of the Release Frame. When the pitcher is preparing to release the ball, he will grab the ball in his hand so YOLOv7 can not detect it. Once YOLOv7 detects the ball, it means that the ball is out of the pitcher's hand, so we can rely on this phenomenon and determine when it is Release Frame.
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IEEE/ICACT20240248 Slide.07
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