Hover rejection through dynamic thresholding

An electronic device, comprising:

• a touch screen;
• a touch screen controller coupled to the touch screen and configured to:
• identify an island in a matrix of acquired touch data values, the island comprising nodes containing adjacent touch data values indicating a potential touch of a touch screen;
• calculate a variance of the island;
• where the variance exceeds a variance threshold, validate the island as a representing touch;
• where the variance does not exceed the variance threshold, determine whether the island represents a touch or a hover by:
• calculating a sharpness by applying weights to the nodes of the island, wherein a neighboring node that is adjacent to a peak node containing a peak acquired touch data value is weighted less than a non-neighboring node that is not adjacent to the peak node;
• calculating a product of the variance and the sharpness;
• determining an island strength threshold as a function of the product;
• determining that the island represents a touch where a highest touch data value of the island is greater than the island strength threshold;
• determining that the island represents a hover where the highest touch data value of the island is less than the island strength threshold.

A method, comprising:

• calculate a variance of an island in acquired touch data values;
• where the variance exceeds a variance threshold, validate the island as a representing touch;
• where the variance does not exceed the variance threshold, determine whether the island represents a touch or a hover by:
• calculating a sharpness by applying weights to nodes of the island, wherein neighboring nodes adjacent to a peak node are weighted less than non-neighboring nodes not adjacent to the peak node;
• determining an island strength threshold as a function of a product of the variance and the sharpness;
• and
• determining that the island represents a touch where a highest touch data value of the island is greater than the island strength threshold, and that the island represents a hover where the highest touch data value of the island is less than the island strength threshold.