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Motion component dominance factors for motion locking of touch sensor data

a technology of motion components and touch sensor data, applied in image analysis, instruments, computing, etc., can solve the problems of normalized sensor output values that cannot be corrected and other problems, and achieve the effect of improving the accuracy of locking onto dominant motion components

Inactive Publication Date: 2009-07-09
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a method for improving the accuracy of touch sensor panels by detecting and removing ungrounded objects, such as waterdrops or coins, from the sensor. It also explains how to adjust for changes in temperature and how to improve the accuracy of gesture recognition by using motion dominance ratios and axis domination confidence values. Overall, this method helps to produce more accurate and reliable touch sensor output values.

Problems solved by technology

To do otherwise could produce inaccurate normalized sensor output values.

Method used

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  • Motion component dominance factors for motion locking of touch sensor data
  • Motion component dominance factors for motion locking of touch sensor data
  • Motion component dominance factors for motion locking of touch sensor data

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Embodiment Construction

[0021]In the following description of preferred embodiments, reference is made to the accompanying drawings in which it is shown by way of illustration specific embodiments in which the invention can be practiced. It is to be understood that other embodiments can be used and structural changes can be made without departing from the scope of the embodiments of this invention.

[0022]This relates to an image jaggedness filter that can be used to detect the presence of ungrounded objects such as water droplets or coins, and delay periodic local baseline offset adjustments until these objects have largely disappeared. To do otherwise could produce inaccurate normalized sensor output values. This also relates to the application of a global baseline offset to quickly modify the sensor offset values to account for conditions such as rapid temperature changes. Background pixels not part of any touch regions can be used to detect changes to no-touch sensor output values and compute the global ...

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Abstract

An image jaggedness filter is disclosed that can be used to detect the presence of ungrounded objects such as water droplets or coins, and delay periodic baseline adjustments until these objects are no longer present. To do otherwise could produce inaccurate normalized baseline sensor output values. The application of a global baseline offset is also disclosed to quickly modify the sensor offset values to account for conditions such as rapid temperature changes. Background pixels not part of any touch regions can be used to detect changes to no-touch sensor output values and globally modify the sensor offset values accordingly. The use of motion dominance ratios and axis domination confidence values is also disclosed to improve the accuracy of locking onto dominant motion components as part of gesture recognition.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Patent Application No. 61 / 019,222 filed on Jan. 4, 2008, the contents of which are incorporated herein by reference in their entirety for all purposes.FIELD OF THE INVENTION[0002]This relates to touch sensor panels used as input devices for computing systems, and more particularly, to the normalization and post-processing of touch sensor data.BACKGROUND OF THE INVENTION[0003]Many types of input devices are presently available for performing operations in a computing system, such as buttons or keys, mice, trackballs, touch sensor panels, joysticks, touch screens and the like. Touch screens, in particular, are becoming increasingly popular because of their ease and versatility of operation as well as their declining price. Touch screens can include a touch sensor panel, which can be a clear panel with a touch-sensitive surface. The touch sensor panel can be positioned partially or comp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/041
CPCG06F3/0418G06K9/50G06F3/04883G06T7/337G06V10/421
Inventor WESTERMAN, WAYNE CARL
Owner APPLE INC
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