Irregular input identification

Patent metadata

Field	Value
Publication number	US-9411468-B2
Application number	US-201213584725-A
Country	US
Kind code	B2
Filing date	Aug 13, 2012
Priority date	Jan 3, 2007
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Techniques for identifying irregular objects in contact with, or in close proximity to, a touch-surface are described. An irregularity measure is determined based on the regions intrinsic characteristics (e.g., energy content) rather than on the shape (or pattern) of the pixels within the region.

First claim

What is claimed is:

1. A method to process a proximity image, comprising:
receiving a proximity image;
smoothing the proximity image to generate a filtered proximity image;
generating a dispersion image by subtracting the filtered proximity image from the proximity image;
determining an irregularity measure value for the dispersion image, the irregularity measure value indicating a degree of irregularity in the shape of the dispersion image; and
controlling an operation of a touch-surface device if the irregularity measure value is above a specified threshold.

2. The method of claim 1 , wherein the specified threshold comprises a constant function.

3. The method of claim 1 , wherein the specified threshold comprises a linear function.

4. The method of claim 1 , wherein the specified threshold comprises a non-linear function.

5. The method of claim 1 , wherein the specified threshold comprises two or more linear functions.

6. The method of claim 1 , wherein the operation of the touch-surface device comprises causing the touch-surface device to obtain baseline touch-surface sensor values.

7. The method of claim 1 , wherein the operation of the touch-surface device comprises:
utilizing multiple sampling frequencies for operation of the touch-surface device;
determining an irregularity measure value corresponding to each of the multiple sampling frequencies;
ignoring a touch-surface sensor sampling frequency during touch-surface device operations when a corresponding determined irregularity measure value is greater than the specified threshold.

8. The method of claim 1 , wherein the operation of a touch-surface device comprises causing the touch-surface device to enter into a low-power state.

9. The method of claim 1 , wherein the operation of a touch-surface device comprises causing the touch-surface device to exit a low-power state.

10. The method of claim 1 , wherein the touch-surface device comprises one of the devices selected from the group of tablet computer system, notebook computer system, portable music player, portable video player, personal digital assistant and mobile telephone.

11. A non-transitory program storage device, readable by a programmable control device, comprising instructions stored thereon for causing the programmable control device to perform the method of claim 1 .

12. A portable electronic device, comprising:
a touch input touch-surface component of the touch-surface device;
means for receiving a proximity image from the touch input touch-surface component; and
processing means for performing the acts of smoothing, generating, determining and controlling in accordance with claim 1 .

13. The device in accordance with claim 12 , wherein the processing means is operative for:
determining a far field image form the proximity image; and
controlling operation of the mobile telephone based on both the determined irregularity measure value and the far field image.

14. The device in accordance with claim 12 , wherein the portable electronic device comprises is selected from the group consisting of a tablet computer system, a hand-held computer system, a portable music player system, a portable video player system and a mobile telephone.

15. A method to identify an irregular input source to a touch-surface device, comprising:
obtaining a proximity image;
generating a dispersion image from the proximity image;
segmenting the proximity image to identify a plurality of patches;
determining an irregularity measure value for each of the plurality of patches based on the dispersion image, the irregularity measure value indicating a degree of irregularity in the space of each of the plurality of patches;
identifying one of the plurality of patches as being associated with an irregular object when the irregularity measure value of the one patch is above a specified threshold;
controlling an operation of the touch-surface device based on the identification of the irregular object;
smoothing the proximity image to generate a filtered proximity image;
wherein the act of generating the dispersion image comprises subtracting the filtered proximity image from the proximity image; and
wherein the act of determining an irregularity measure value for each of the plurality of patches comprises at least determining a total energy value for each of the plurality of patches.

16. The method of claim 15 , wherein the act of determining comprises: determining a spatial energy value for each of the plurality of patches; determining a peak energy value for each of the plurality of patches; and determining an irregularity measure value for each of the plurality of patches by dividing the difference between the spatial energy value and the peak energy value for each patch by the total energy value for each patch.

17. The method of claim 15 , wherein the specified threshold comprises a constant function.

18. The method of claim 15 , wherein the specified threshold comprises a linear function.

19. The method of claim 15 , wherein the specified threshold comprises a non-linear function.

20. The method of claim 15 , wherein the specified threshold comprises two or more linear functions.

21. The method of claim 15 , wherein the irregular patch comprises a patch formed by an ear.

22. The method of claim 15 , wherein the act of identifying comprises distinguishing a patch associated with an irregular object from a patch associated with a large object based on the irregularity measure value for the patch associated with the irregular object being greater than the specified threshold and the irregularity measure value for the patch associated with the large object being less than the specified threshold.

23. The method of claim 22 , wherein the large object comprises a cheek, a chest or a leg.

24. The method of claim 22 , wherein the irregular object comprises an ear, coin, or a key.

25. The method of claim 15 , wherein the act of identifying comprises distinguishing a patch associated with an irregular object from a patch associated with a small regular object based on the irregularity measure value for the patch associated with the irregular object being greater than the specified threshold and the irregularity measure value for the patch associated with the small regular object being less than the specified threshold.

26. The method of claim 25 , wherein the small regular object comprises a finger or a thumb.

27. The method of claim 15 , wherein the plurality of patches have patch pixel values and the method further comprising:
compensating the proximity image for background noise;
filtering the proximity image; and
reducing or down-scalling peripheral patch pixel values for one or more of the plurality of patches based on the compensated proximity image and the filtered proximity image.

28. A non-transitory program storage device, readable by a programmable control device, comprising instructions stored thereon for causing the programmable control device to perform the method of claim 15 .

29. A portable electronic device, comprising.
a touch input touch-surface component;
means for receiving the proximity image from the touch input touch-surface component; and
processing means for performing the acts of generating, segmenting, determining, identifying and controlling in accordance with claim 15 .

Assignees

• Westerman Wayne Carl
• Apple Inc

Inventors

• Westerman Wayne Carl

Classifications

• G06T7/401

  Physics · mapped topic

• G06F3/0421

  by interrupting or reflecting a light beam, e.g. optical touch-screen · CPC title

• G06F2203/04104

  Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger · CPC title

• G06F2203/04101

  2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title