Patent ID: 8406433

Claim:
A 3-point positioning device, comprising: an auxiliary positioning module, comprising: a first auxiliary positioning unit; a second auxiliary positioning unit; and a third auxiliary positioning unit; wherein a first auxiliary positioning line is formed between the first auxiliary positioning unit and the second auxiliary positioning unit; wherein a length of the first auxiliary positioning line is equal to a first predetermined distance; wherein a second auxiliary positioning line is formed between the second auxiliary positioning unit and the third auxiliary positioning unit; wherein a length of the second auxiliary positioning line is equal to a second predetermined distance; wherein an included angle between the first and the second auxiliary positioning lines is a predetermined included angle; an image sensor, for sensing a scene having a range including the first, the second, and the third auxiliary positioning unit, and accordingly generating a sensed image; wherein the range of the scene is determined by a predetermined view angle of the image sensor; and a location-calculating circuit, for receiving the sensed image so as to recognize a first sensing unit of the image sensor corresponding to the first auxiliary positioning unit, a second sensing unit of the image sensor corresponding to the second auxiliary positioning unit, and a third sensing unit of the image sensor corresponding to the third auxiliary positioning unit, and calculating a measured distance and a measured angle between the auxiliary positioning module and the image sensor according to positions of the first, the second, and the third sensing units so as to accordingly output at least a distance signal or an angle signal.