MULTITOUCH FRAME MATCHING WITH DISTANCE FIELDS

摘要

Disclosed are a touch sensitive device and corresponding method that utilizes distance fields for frame matching. The device includes a touch interface having row conductors and column conductors. A row signal generator transmits a row signal on at least one of the row conductors. A touch processor is used to process column signals from data received on at least one of the column conductors. The touch processor is configured to use discrete values from the column signals to compute a distance field function and store a representation of a distance field grid for a current frame, use the representation of the distance field grid to determine data representing a state change, and use the data representing a state change to match at least one touch location from a previous frame to at least one touch location in the current frame.

主权项

1. A touch sensitive device that utilizes distance fields for frame matching, comprising:
i) touch interface comprising row conductors and column conductors; ii) row signal generator for transmitting a first row signal on at least one of the row conductors; iii) touch processor configured to process column signals from data received on at least one of the column conductors, the touch processor being configured to:
(1) use discrete values from the column signals to compute a distance field function and store a representation of a distance field grid for a current frame;(2) use the representation of the distance field grid to determine data representing a state change; and,(3) use the data representing a state change to match at least one touch location from a previous frame to at least one touch location in the current frame.