Capacitive sensing with high pass filtering for segmentation
AssigneeSynaptics Incorporated
InventorsYi Ling, Sanjay Mani
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Abstract
Embodiments described herein include a method for using multiple filtered images. The method includes acquiring changes of capacitance in a sensing region at a plurality of sensor electrodes in a capacitive sensor. The method also includes generating a capacitive frame based on the changes of capacitance and calculating one or more filtered capacitive frames by modifying the capacitive frame with a spatial filter. The method also includes performing clump detection on the one or more filtered capacitive frames, where clump detection includes detecting locations in each filtered capacitive frame exceeding a first threshold near locations that exceed a second threshold in the corresponding capacitive frame.
Claims20
A method of input detection, comprising:
- detecting changes of capacitance in a sensing region of a capacitive sensor;
- generating a first capacitive frame based on the detected changes of capacitance;
- filtering the first capacitive frame using a high pass spatial filter to produce at least one filtered capacitive frame;
- and
- detecting an input in the sensing region coinciding with a location at which an amplitude of the at least one filtered capacitive frame exceeds a first threshold and an amplitude of the first capacitive frame exceeds a second threshold.
An input device, comprising:
- a plurality of capacitive sensing electrodes configured to receive a signal;
- and
- a processing system coupled to the plurality of capacitive sensing electrodes, the processing system configured to:
- detect changes of capacitance in a sensing region associated with the plurality of capacitive sensing electrodes;
- generate a first capacitive frame based on the detected changes of capacitance;
- filter the first capacitive frame to produce at least one filtered capacitive frame;
- and
- detect an input in the sensing region coinciding with a location at which an amplitude of the at least one filtered capacitive frame exceeds a first threshold and an amplitude of the first capacitive frame exceeds a second threshold.
A processing system for capacitive sensing, comprising:
- a filter configured to filter a first capacitive frame to produce at least one filtered capacitive frame;
- a segmentation module configured to detect a location at which an amplitude of the at least one filtered capacitive frame exceeds a first threshold and an amplitude of the first capacitive frame exceeds a second threshold;
- and
- a classifier configured to classify an input associated with the detected location.
Dependencies are inferred from the claim text.