Temporal filter touch detection

Patent metadata

Field	Value
Publication number	US-11237671-B1
Application number	US-202016903564-A
Country	US
Kind code	B1
Filing date	Jun 17, 2020
Priority date	Jun 17, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

Detecting a touch includes determining, from first raw touch data, an estimated touch type for a first plurality of frames, obtaining second raw touch data comprising a probability that a touch has occurred for each of a second plurality of frames, applying the selected filter to the additional raw data to obtain processed data, and detecting whether a touch has occurred for a particular frame based on the processed data.

First claim

The invention claimed is:

1. A non-transitory computer readable medium comprising computer readable code executable by one or more processors to:
determine, from first raw touch data, an estimated touch type for a first plurality of frames;
obtain second raw touch data comprising a probability that a touch has occurred for each of a second plurality of frames;
select a filter based on the estimated touch type;
apply the selected filter to the second raw data to obtain processed data;
detect whether a touch has occurred for a particular frame based on the processed data.

2. The non-transitory computer readable medium of claim 1 , wherein determining the estimated touch type comprises obtaining a probability that a touch has occurred for each of the first plurality of frames.

3. The non-transitory computer readable medium of claim 1 , wherein the touch type comprises one selected from a group consisting of a click and a drag.

4. The non-transitory computer readable medium of claim 3 , wherein the computer readable code to select the filter based on the estimated touch type comprises computer readable code to select a high pass filter if the determined estimated touch type is a click.

5. The non-transitory computer readable medium of claim 3 , wherein the computer readable code to select the filter based on the estimated touch type comprises computer readable code to select a low pass filter if the determined estimated touch type is a drag.

6. The non-transitory computer readable medium of claim 1 , further comprising computer readable code to select a threshold probability value based on the estimated touch type, wherein the computer readable code to detect whether a touch has occurred for a particular frame comprises determining that the processed data for the particular frame satisfies the selected threshold value.

7. The non-transitory computer readable medium of claim 1 , wherein the touch type is associated with a touch event, and wherein the touch event occurs between a fingertip and a surface.

8. A system for detecting a touch, comprising:
one or more processors; and
one or more storage devices comprising computer readable code executable by the one or more processors to:
determine, from first raw touch data, an estimated touch type for a first plurality of frames;
obtain second raw touch data comprising a probability that a touch has occurred for each of a second plurality of frames;
select a filter based on the estimated touch type;
apply the selected filter to the second raw data to obtain processed data;
detect whether a touch has occurred for a particular frame based on the processed data.

9. The system of claim 8 , wherein determining the estimated touch type comprises obtaining a probability that a touch has occurred for each of the first plurality of frames.

10. The system of claim 8 , wherein the touch type comprises one selected from a group consisting of a click and a drag.

11. The system of claim 10 , wherein the computer readable code to select the filter based on the estimated touch type comprises computer readable code to select a high pass filter if the determined estimated touch type is a click.

12. The system of claim 10 , wherein the computer readable code to select the filter based on the estimated touch type comprises computer readable code to select a low pass filter if the determined estimated touch type is a drag.

13. The system of claim 8 , further comprising computer readable code to select a threshold probability value based on the estimated touch type, wherein the computer readable code to detect whether a touch has occurred for a particular frame comprises determining that the processed data for the particular frame satisfies the selected threshold value.

14. The system of claim 8 , wherein the touch type is associated with a touch event, and wherein the touch event occurs between a fingertip and a surface.

15. A method for detecting a touch, comprising:
determining, from first raw touch data, an estimated touch type for a first plurality of frames;
obtaining second raw touch data comprising a probability that a touch has occurred for each of a second plurality of frames;
selecting a filter based on the estimated touch type;
applying the selected filter to the second raw data to obtain processed data;
detecting whether a touch has occurred for a particular frame based on the processed data.

16. The method of claim 15 , wherein determining the estimated touch type comprises obtaining a probability that a touch has occurred for each of the first plurality of frames.

17. The method of claim 15 , wherein the touch type comprises one selected from a group consisting of a click and a drag.

18. The method of claim 17 , wherein selecting the filter based on the estimated touch type comprises selecting a high pass filter if the determined estimated touch type is a click.

19. The method of claim 17 , wherein selecting the filter based on the estimated touch type comprises selecting a low pass filter if the determined estimated touch type is a drag.

20. The method of claim 15 , further comprising selecting a threshold probability value based on the estimated touch type, wherein detecting whether a touch has occurred for a particular frame comprises determining that the processed data for the particular frame satisfies the selected threshold value.

Assignees

• Apple Inc

Inventors

• Wang Lejing
• Ben Himane Mohamed Selim

Classifications

• G06F3/0425 Primary

  using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected (tracking a projected light spot to determine a position on a display surface G06F3/0386) · CPC title

• G06F3/04186 Primary

  Touch location disambiguation · CPC title

• G06F3/0421

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