ACCELERATION-BASED INTERACTION FOR MULTI-POINTER INDIRECT INPUT DEVICES

• US 20130100018A1
• Filed: 10/20/2011
• Published: 04/25/2013
• Est. Priority Date: 10/20/2011
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Honji, Scott
• Granted Patent: US 9,274,642 B2
• Time in Patent Office: Days
• US Class Current: 345/158
• CPC Class Codes: G06F 2203/04808 Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04842 Selection of displayed objects or displayed text elements G06F3/0482 takes precedence
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

An indirect interaction input device, such as but not limited to a touch sensor, can provide multiple points of input. These multiple points are in turn mapped to multiple positions on an output device such as a display. The multiple points of input, however, make the application of pointer ballistics and resolution differences between the input sensor and target display more difficult to manage. Thus, a characteristic of the set of points is identified and used to adjust the mapping of each of the points. For example, one way to solve this problem is to identify the input point with the least displacement from a prior frame, whether from its prior point or from a reference point. This displacement is used to adjust the mapping of the set of input points from the input device to their corresponding display coordinates.

Claims

1. A computer-implemented process comprising:

receiving information describing input points from a multi-pointer indirect input device for a plurality of frames into memory;

mapping the input points for one of the frames to locations in a display coordinate space for a display; and

determining displacement of each of the input points in the frame with respect to another point in another of the frames;

modifying the mapping of the input points according to the determined displacement; and

displaying points on a display according to the modified mapping of the input points.

2. The computer implemented process of claim 1, wherein modifying the mapping comprises:

selecting one of the input points with a lowest magnitude displacement;

determining an offset according to the lowest magnitude displacement; and

for each input point, adding the offset to its mapped location.

3. The computer implemented process of claim 1, wherein modifying the mapping comprises:

selecting one of the input points with a lowest magnitude displacement;

applying an offset to a reference point related to the input points according to the lowest magnitude displacement; and

for each input point, determining its location according to its offset from the reference point.

4. The computer-implemented process of claim 1, wherein the other point in the other frame is a position of the input point in the other frame.

5. The computer-implemented process of claim 1, wherein the other point in the other frame is a sensor locator for the other frame.

6. The computer implemented process of claim 1, wherein a small displacement results in adjusting a mapping so as to reduce the displacement of a point from one frame to a next frame.

7. The computer-implemented process of claim 1, wherein a large displacement result in adjust a mapping so as to increase the displacement of a point from one frame to a next frame.

8. The computer-implemented process of claim 1, wherein the modifying of the mapping applies a different acceleration function for each axis.

9. The computer-implemented process of claim 1, wherein the modifying of the mapping applies acceleration according to a magnitude of the displacement.

10. The computer-implemented process of claim 8 wherein the acceleration function is a piecewise linear function of displacement to accelerated displacement.

11. An article of manufacture, comprising:

a computer readable storage medium having computer program instructions encoded thereon that when processed by a computer instruct the computer to perform a process comprising;

receiving information describing input points from a multipointer indirect input device for a plurality of frames into memory;

mapping the input points for one of the frames to locations in a display coordinate space for a display; and

determining displacement of each of the input points in the frame with respect to another point in another of the frames;

modifying the mapping of the input points according to the determined displacement; and

displaying points on a display according to the modified mapping of the input points.

12. The article of manufacture of claim 11, wherein modifying the mapping comprises:

selecting one of the input points with a lowest magnitude displacement;

determining an offset according to the lowest magnitude displacement; and

for each input point, adding the offset to its mapped location.

13. The article of manufacture of claim 11, wherein modifying the mapping comprises:

selecting one of the input points with a lowest magnitude displacement;

applying an offset to a reference point related to the input points according to the lowest magnitude displacement; and

for each input point, determining its location according to its offset from the reference point.

14. The article of manufacture of claim 11, wherein the other point in the other frame is a position of the input point in the other frame.

15. The article of manufacture of claim 11, wherein the other point in the other frame is a sensor locator for the other frame.

16. The article of manufacture of claim 11, wherein a small displacement results in adjusting a mapping so as to reduce the displacement of a point from one frame to a next frame.

17. The article of manufacture of claim 11, wherein a large displacement result in adjust a mapping so as to increase the displacement of a point from one frame to a next frame.

18. The article of manufacture of claim 11, wherein the modifying of the mapping applies a different acceleration function for each axis.

19. The article of manufacture of claim 11, wherein the modifying of the mapping applies acceleration according to a magnitude of the displacement.

20. The article of manufacture of claim 18 wherein the acceleration function is a piecewise linear function of displacement to accelerated displacement.