Motion detection method

This invention reveals a kind of motion detection method. Via the reference level sensor of a motion detecting module, and plural comparison sensors are utilized to select the sensed data. In addition, by collocating the operation domain transform with the application of judging mathematic equation (judging mathematic equation of direction, movement times, and speed), the utilization of sensors can be decreased (additionally, no need of using sensors having good uniformity) and the conventional complicated operation method is simplified. Furthermore, it prevents the original sensed data from being easily affected by the environment, electric noise, and difference in between the sensors. Eventually, it accurately obtains the motion direction and speed of the motion-detecting module.