Figure 1. Rectangular calibration grid.
This image shows a board with a black and white grid on top used for calibrating the camera used on data acquisition. Each square of the grid has a length of 10 cm and the total grid area has a size of 50 cm height and 90 cm long. The calibration grid expands along the whole length of the treadmill band to reduce spatial measurement error. The squares are used to obtain the pinhole camera model which is used to convert image point coordinates in pixels to image point coordinates in centimeters.
This image shows a board with a black and white grid on top used for calibrating the camera used on data acquisition. Each square of the grid has a length of 10 cm and the total grid area has a size of 50 cm height and 90 cm long. The calibration grid expands along the whole length of the treadmill band to reduce spatial measurement error. The squares are used to obtain the pinhole camera model which is used to convert image point coordinates in pixels to image point coordinates in centimeters.
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