Pointer positioning device and method

A pointer positioning method performed by a pointer positioning device,

• the pointer positioning device comprising:
• two auxiliary points disposed at a periphery of an image display to provide light of a predetermined spectrum,
• an image sensor which points an aiming point with an optical axis on a plane formed by a display screen of the image display and receives the light of the predetermined spectrum from the two auxiliary points,
• an optical filter disposed in front of the image sensor to block light outside the predetermined spectrum , and
• a processing and storage unit;
• the method comprising the steps of:
• providing, by the two auxiliary points, light of the predetermined spectrum;
• receiving, through the optical filter and by the image sensor, the light of the predetermined spectrum from the auxiliary points;
• correcting and positioning the aiming point, by the processing and storage unit, according to a correction vector of the optical axis and a reference distance information,
• wherein
• the reference distance information includes
• (i) a distance between images of the two auxiliary points as captured by the image sensor from a predetermined distance, and
• (ii) an average coordinate of the images of the two auxiliary points as captured by the image sensor from said predetermined distance;
• and
• the correction vector of the optical axis is obtained by (i) pointing the aiming point, from the predetermined distance, at one of the two auxiliary points and (ii) calculating a vector between an image of the aiming point as captured by the image sensor and the image of said one of the two auxiliary points as captured by the image sensor;
• pointing the aiming point to four corners of the display screen to respectively capture a digital image and calculating coordinates of the four corners of the display screen on the digital image based on the images of the auxiliary points corrected by the correction vector of the optical axis;
• calculating a position of the aiming point according to the coordinates of the four corners of the display screen on the digital image;
• and
• adjusting, by the processing and storage unit, a moving sensitivity of the aiming point during operation based on at least an adjustable scale parameter,
• wherein the aiming point is at least one of a spot projected by a projector, a bullet drop point projected by a light gun, or a cursor controlled by a mouse.

An image sensor for positioning an aiming point pointed through an optical axis on a display screen of an image display, wherein an optical filter is disposed in front of the image sensor such that the image sensor only senses light of a predetermined spectrum coming from a plurality of auxiliary points disposed at a periphery of the display screen, and wherein the auxiliary points are utilized as reference points for correcting an initial setup and positioning the aiming point, the image sensor comprising:

• a sensing unit for receiving the light of the predetermined spectrum from the auxiliary points and converting the light of the predetermined spectrum into electrical signals;
• and
• a processing and storage unit for receiving the electrical signals, correcting the initial setup and calculating the positioning of the aiming point according to a correction vector of the optical axis and a reference distance information,
• wherein
• the correction vector of the optical axis is obtained by (i) pointing the aiming point, from a predetermined distance, at one of the two auxiliary points and (ii) calculating a vector between an image of the aiming point as captured by the image sensor and an image of said one of the auxiliary points as captured by the image sensor,
• the reference distance information includes (a) a distance between images of the two auxiliary points captured by the sensing unit at said predetermined distance, and (b) an average coordinate of the images of the plurality of auxiliary points captured by the sensing unit from said predetermined distance,
• the processing and storage unit is further configured to adjust a moving sensitivity of the aiming point during operation based on at least an adjustable scale parameter, and
• the aiming point is at least one of a spot projected by a projector, a bullet drop point projected by a light gun, or a cursor controlled by a mouse.