Method of processing data of optical mouse

A method of processing data of an optical mouse, comprising:

• analyzing optical data in an Image Signal Processor (ISP) wherein the ISP includes an X axis navigation engine for processing data on a reference image for the motion of an X axis direction among the processed image pixel data and a Y axis navigation engine for processing data on a reference image for the motion of a Y axis direction among the processed image pixel data, and the X and Y axis navigation engines each store the reference image of the n−1 th frame, the present image of the nth frame, and a reference image of the nth frame;
• calculating a vector VX in the X-axis direction using approximately equal parts in the present image of the nth frame and the reference image of the n−1 th frame of the X axis direction by comparing the present and reference images;
• calculating a vector VY in the Y axis direction, using approximately equal parts in the present image of the nth frame and the reference image of the n−1 th frame of the Y axis direction by comparing the present and reference images;
• calculating a motion vector by adding the calculated vectors VX and VY, wherein if a value of the calculated VX is not “0”, the reference image of the n−1 th frame of the X axis direction is updated to the reference image of the nth frame;
• wherein if the value of the calculated VX is “0”, the reference image of the n−1 th frame of the X axis direction is maintained;
• wherein if a value of the calculated VY is not “0”, the reference image of the n−1 th frame of the Y axis direction is updated to the reference image of the nth frame;
• wherein if the value of the calculated VY is “0”, the reference image of the n−1 th frame of the Y axis direction is maintained;
• and
• transmitting the calculated motion vector to a personal computer through an interface.

A method of processing digitally converted image pixel data of an Image Signal Processor (ISP) included in an optical mouse, comprising:

• a. calculating vectors VX and VY using X axis and Y axis navigation engines for processing motions in X and Y axis directions, respectively;
• and
• b. calculating a motion vector of the optical mouse by the steps of
• (1) storing the digitally converted image pixel data in a present buffer of the nth frame as the present image of the nth frame;
• (2) extracting some images from the present buffer of the nth frame and storing the extracted images in a reference buffer of the nth frame;
• (3) comparing the stored present image of the nth frame with the reference image of the n−1 th frame of the X axis direction and the reference image of the n−1 th frame of the Y axis direction;
• (3) calculating VX, which is a vector of the X axis direction, using approximately equal parts in the present image of the nth frame and the reference image of the n−1 th frame of the X axis direction by comparing the present and reference images, and calculating VY, which is a vector of the Y axis direction, using approximately equal parts in the present image of the nth frame and the reference image of the n−1 th frame of the Y axis direction by comparing the present and reference images;
• and
• (4) calculating the motion vector by adding the calculated vectors VX and VY;
• wherein if a value of the calculated VX is not “0”,the reference image of the n−1 th frame of the X axis direction is updated to the reference image of the nth frame, while if the value of the calculated VX is “0”,the reference image of the n−1 th frame of the X axis direction is maintained;
• while if a value of the calculated VY is not “0”, the reference image of the n−1 th frame of the Y axis direction is updated to the reference image of the nth frame, while if the value of the calculated VY is “0”, the reference image of the n−1 th frame of the Y axis direction is maintained.