Downsampling data for crosstalk compensation

A method of compensating for crosstalk in a touch sensitive device, the method comprising:

• generating a display image and a touch image;
• downsampling the display image;
• estimating a plurality of compensation values based on the downsampled image, each of the plurality of compensation values being representative of crosstalk in a corresponding plurality of touch pixels in the touch image;
• and
• adjusting the touch image based on the plurality of compensation values to compensate for the crosstalk, wherein the adjusted touch image is indicative of an amount of touch or hover.

A touch sensitive device comprising:

• a touch sensor panel configured to capture an image indicative of a touch or hover at the panel;
• and
• a crosstalk compensator configured to
• input information indicative of crosstalk at the panel,
• calculate a compensation factor based on the inputted information, and
• apply the compensation factor to the captured image to compensate for the crosstalk, wherein the compensated image is indicative of an amount of touch or hover;
• wherein the crosstalk compensator comprises a crosstalk image calculator configured to calculate the compensation factor, the compensation factor being a crosstalk image, each pixel in the crosstalk image representative of the crosstalk in a corresponding plurality of touch pixels in the captured image.

A method of compensating for crosstalk in a touch sensitive device, the method comprising:

• mapping display pixels to touch pixels experiencing crosstalk;
• capturing a display image from the mapped display pixels;
• downsampling the display image;
• calculating a plurality of compensation values based on the downsampled display image, each of the plurality of compensation values being representative of crosstalk in a corresponding plurality of touch pixels in the captured touch image;
• capturing a touch image from the mapped touch pixels;
• and
• applying the plurality of compensation values to the captured touch image to compensate for the crosstalk, wherein the compensated touch image is indicative of an amount of touch or hover.