Mitigating spatially correlated noise in data from capacitive sensors

A processing system for performing capacitive sensing, comprising:

• an interface configured to couple to a plurality of sensor electrodes in a sensing region of an input device, wherein the plurality of sensor electrodes are categorized into a plurality of groups of sensor electrodes where sensor electrodes in each of the groups are affected by a common noise source;
• at least one sensor module configured to:
• determine resulting signals for the sensor electrodes in a first group of the groups of sensor electrodes,
• compare the resulting signals to a predefined touch threshold to determine whether an input object is proximate to the sensor electrodes in the first group,
• calculate at least one offset using the resulting signals based on a determination that the input object is not proximate to the sensor electrodes in the first group, and
• compensate for an effect of the common noise source by adjusting the resulting signals using the at least one offset.

A method for performing capacitive sensing using a plurality of sensor electrodes in a sensing region of an input device, comprising:

• determining resulting signals for sensor electrodes in a first group of the plurality of sensor electrodes where the sensor electrodes in the first group are affected by a common noise source;
• comparing the resulting signals of the first group to a predefined touch threshold to determine whether an input object is proximate to the sensor electrodes in the first group;
• calculating at least one offset using the resulting signals based on a determination that the input object is not proximate to the sensor electrodes in the first group;
• and
• compensating for an effect of the common noise source by adjusting the resulting signals using the at least one offset.