This study added a hand gesture quick interactive operation to the human–machine interface of a leg sport system. Hands are of varying skin color, thus, the background noise and light rays during detection can lead to misjudgments. This study adopted the YCbCr color system to detect skin color and minimize the impact of light rays to mark the characteristic point after the skin color had been separated. The system defines three simplified gestures: clenching the fist with the forefinger and reaching out represents the mouse pointer, clenching the fist with the forefinger and thumb and reaching out represents the left button of the mouse, and clenching the fist with the forefinger and little finger and reaching out represents the right button of the mouse, namely clicking the mouse is replaced by hand gestures. The change in the characteristic point is used for operating the hand mouse and interactive connection with games to achieve a preferred presence and feeling of reality.

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