Patent ID: 7720317

Claim:
A handheld image-tracking device within a rectangle-shaped two-dimensional sensing array, said sensing array comprising a first side length and a second side length, said second side length is obtained through a block matching algorithm and a full search comprising steps of: (a) obtaining a base block; (b) calculating a maximum leftward-and-rightward sensing velocity and a maximum back-and-forth sensing velocity, said maximum leftward-and-rightward sensing velocity being a maximum velocity for swinging a human's hand leftward and rightward, said maximum back-and-forth sensing velocity having a ratio to said maximum leftward-and-rightward sensing velocity with the same sense of force as said maximum velocity for swinging a human's hand leftward and rightward; and (c) calculating said second side length according to said first side length, said ratio between the back-and-forth moving velocity and the leftward-and-rightward moving velocity, and one side length of the base block.