Patent ID: 7639236

Claim:
An optical pointing device comprising: an image sensor for obtaining and providing a surface image corresponding to a motion searching range; and an image processor for changing and determining a direction and a length of an X axis and a Y axis of the motion searching range and a reference area to continuously obtain the surface image corresponding to the direction and length of the X axis and Y axis, obtaining a reference frame and a sample frame using the continuously obtained surface image, setting a certain area of the reference frame corresponding to the direction and length of the X axis and Y axis of the reference area as the reference area, and calculating a correlation between the reference area and the sample frame, to thereby calculate motion, wherein the image processor changes the direction and length of the X axis and Y axis of the motion searching range and the reference area according to an arrangement structure of a light source and the image sensor; and wherein when the light source and the image sensor are parallel to a Y axis of the optical pointing device, the image processor determines the direction of the X axis and Y axis of the motion searching range such that an actual motion direction is identical to a recognized motion direction and sets the length of the X axis to be longer than the length of the Y axis, and when the light source and the image sensor are parallel to an X axis of the optical pointing device, the image processor determines the direction of the X axis and Y axis of the motion searching range such that the actual motion direction is perpendicular to the recognized motion direction and sets the length of the X axis to be shorter than the length of the Y axis.