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The Prepare Frame is defined in the 20 frames preceding the Release Frame. We will find which frame where the hitter's knee position is the lowest in those 20 frames.
This figure represents the process of finding the Prepare Frame. First, we determine the Release Frame. We will look back for 20 frames and search for which frame has the lowest knee position. When the hitter is a right-handed hitter, we will check his left knee and vice versa. This Prepare Frame moment represents the hitter in a standing position and provides more accurate information about the positions of the hitter's shoulders, waist, and their knees. Once the Prepare Frame is detected, the upper and lower boundaries of the strike zone are defined. The width of the strike zone is determined manually by marking the width of the home plate. This strike zone, customized based on the hitter's height, provides a more accurate basis for determining a good pitch.
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IEEE/ICACT20240248 Slide.08
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