Method and system for finger sensing, related screen apparatus and computer program product

A method, comprising:

• computing an area of a finger data map, the finger data map including finger detection data generated by a touch screen, the finger data map including a matrix of rows and columns of nodes with each node having respective finger detection data and the computing the area being based on summing nodes having finger detection data exceeding a threshold value;
• extracting two main axes from the finger data map based on nodes in each row and each column having maximum values of finger detection data;
• computing lengths and orientations of the two main axes, each of the lengths of the two main axes being computed as a number of the nodes;
• determining from the two main axes a major axis having a major axis orientation;
• computing a geometrical center and at least one center of mass of the finger data map;
• computing an eccentricity of the finger data map as a ratio of the lengths of the two main axes;
• generating finger orientation direction in a plane of the touch screen using the major axis orientation;
• generating a finger pointing direction along the finger orientation direction in the plane of the touch screen using the geometrical center and the center of mass of the finger data map;
• and
• generating a three-dimensional finger orientation with respect to the plane of the touch screen using the eccentricity and/or the area of the finger data map.

A method, comprising:

• computing an area of a finger data map, the finger data map including finger detection data generated by a touch screen and the finger data map including rows and columns of pixels, each pixel having a value, wherein the area is based on a summation of pixels having finger detection data exceeding threshold value;
• extracting two main axes from the finger data map based on nodes in each row and each column having maximum values of finger detection;
• computing lengths of the two main axes;
• computing an eccentricity of the finger data map as a ratio of the lengths of the two main axes;
• generating a three-dimensional finger orientation with respect to the plane of the touch screen using the eccentricity and the area of the finger data map, wherein generating the three-dimensional finger orientation includes:
• determining whether the eccentricity is greater than or equal to an eccentricity threshold value;
• determining whether the area is greater than or equal to an area threshold value;
• determining the three-dimensional finger orientation is in a first range of zero to forty-five degrees if the eccentricity is greater than or equal to the eccentricity threshold value and the area is greater than or equal to the area threshold value;
• determining whether the eccentricity is less than the eccentricity threshold value;
• determining whether the area is less than the area threshold value;
• determining the three-dimensional finger orientation is in a second range of forty-five to ninety degrees if the eccentricity is less than the eccentricity threshold value and the area is less than the area threshold value.