Systems and methods for image filtering in sensor devices
A processing system for an input device includes a sensor module, a filter module, and a determination module. The sensor module is configured to drive a plurality of transmitter electrodes with transmitter signals; receive, with a plurality of receiver electrodes, resulting signals comprising effects corresponding to the transmitter signals; and produce a first sensor image based on the resulting signals. The filter module is configured to produce a transformed sensor image by applying a spatial filter to the first sensor image. The determination module is configured to positional information and/or the validity of a baseline for the input device based on the transformed sensor image.
1. A processing system for an input device, the processing system comprising:
a sensor module comprising sensor circuitry, the sensor module configured to drive a plurality of transmitter electrodes with transmitter signals; receive, with a plurality of receiver electrodes, resulting signals comprising effects corresponding to the transmitter signals; and produce, based on the resulting signals, a first sensor image comprising raw data; and
a filter module, wherein the filter module is configured to produce a transformed sensor image by applying a spatial filter to the raw data in the first sensor image, wherein the spatial filter is a two-axis gradient sweep filter;
a determination module configured to determine at least one of positional information and a validity of a baseline for the input device based on the transformed sensor image.
2. The processing system of claim 1 , wherein the determination module determines that the baseline is invalid if an input object is detected in the transformed sensor image.
3. The processing system of claim 1 , wherein the processing system is configured to perform relaxation when an input object is detected in the transformed sensor image.
4. The processing system of claim 1 , wherein the filter module is configured to apply the spatial filter substantially simultaneously with the determination module determining the validity or the baseline.
5. A method for an input device, comprising:
driving a plurality of transmitter electrodes with transmitter signals;
receiving, with a plurality of receiver electrodes, resulting signals comprising effects corresponding to the transmitter signals;
producing, based on the resulting signals, a first sensor image comprising raw data;
producing a transformed sensor image by applying a spatial filter to the raw data in the first sensor image, wherein the spatial filter is a two-axis gradient sweep filter; and
determining at least one of positional information and a validity of a baseline for the input device based on the transformed sensor image.
6. The method of claim 5 , further including determining that the baseline is invalid if an input object is detected in the transformed sensor image.
7. The method of claim 5 , further including performing relaxation when an input object is detected in the transformed sensor image.
8. The method of claim 5 , further including applying the spatial filter substantially simultaneously with determining the validity of the baseline.
9. A sensor device comprising:
a plurality of transmitter electrodes;
a plurality of receiver electrodes;
a processing system communicatively coupled to the plurality of transmitter electrodes and the plurality of receiver electrodes, the processing system configured to:
drive a plurality of transmitter electrodes with transmitter signals;
receive, with a plurality of receiver electrodes, resulting signals comprising effects corresponding to the transmitter signals;
produce, based on the resulting signals, a first sensor image comprising raw data; and
produce a transformed sensor image by applying a spatial filter to the raw data in the first sensor image, wherein the spatial filter is a two-axis gradient sweep filter; and
determine at least one of positional information and a validity of a baseline for the input device based on the transformed sensor image.
10. The sensor device of claim 9 , wherein the determination module determines that the baseline is invalid if an input object is detected in the transformed sensor image.
11. The sensor device of claim 9 , wherein the processing system is configured to perform relaxation when an input object is detected in the transformed sensor image.
12. The sensor device of claim 9 , wherein the filter module is configured to apply the spatial filter substantially simultaneously with the determination module determining the validity of the baseline.