Coordinate recognition apparatus and control method thereof

• US 9,323,390 B2
• Filed: 11/28/2011
• Issued: 04/26/2016
• Est. Priority Date: 11/29/2010
• Status: Active Grant

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Takeno, Yuishi, Saegusa, Shinji, Ogishima, Takuya, Oishi, Sadatoshi
• Primary Examiner(s): Toatley, Gregory J
• Assistant Examiner(s): SUAREZ, FELIX E
• Application Number:
  US13/305,642
• Publication Number:
  US 20120136624A1
• Time in Patent Office: 1,611 Days
• Field of Search: 702/19, 702/20, 702/150, 702/179, 702/181, 702/183, 345/173
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

According to one embodiment, a coordinate recognition apparatus includes a detection device, a first calculation section, a second calculation section, and a setting section. The detection device detects an operation for an operation area. The first calculation section calculates coordinates of an operation position by a user on the basis of the detection result of the detection device. The second calculation section calculates the smoothed coordinates by smoothing a particular number m (m>0) of samples among the coordinates calculated by the first calculation section counted from the new one in a calculation order. The setting section sets a value of the number m of samples to be smaller as the speed of movement of the operation position is higher.

Claims

1. A coordinate recognition apparatus comprising:

a detection device that detects an operation performed by a user in an operation area;

a first calculation section that calculates coordinates of a position of the operation performed by the user while the user continuously maintains contact with the operation area, on the basis of the detection result of the detection device;

a second calculation section that calculates smoothed coordinates by smoothing a particular number m (m>

0) of newest coordinates calculated by the first calculation section;

a detection section that detects a speed of movement of the operation position of the user in the operation area on the basis of the coordinates calculated by the first calculation section;

a setting section that updates a value of the number m such that the value of the number m of coordinates to smooth becomes smaller as the speed detected by the detection section becomes higher and the value of the number m of coordinates to smooth becomes larger as the speed becomes lower while the user continuously maintains contact with the operation area; and

a controller via which the detection device, the first calculation section, the second calculation section, the detection section, and the setting section perform their respective operations.

2. The apparatus of claim 1, wherein the detection device is an optical detection device which includes a plurality of light-emitting elements, a plurality of light-sensing elements that are arranged to oppose the respective light-emitting elements and output detection signals corresponding to intensities of sensed light, and detects the operation of the user for the operation area between each of the light-emitting elements and each of the light-sensing elements.

3. The apparatus of claim 1, further comprising a memory that stores a predetermined number M (M>

0) of the coordinates calculated by the first calculation section, wherein the setting section sets the number m to a calculation result of M(V₀/V) assuming that a reference speed movement is V₀ and the speed of movement of the position of the operation performed by the user for the operation area is V.

4. The apparatus of claim 1, wherein the setting section sets the number m to have a value in proportion to α

/V when it is assumed that the speed of movement is V and a coefficient α

is defined to have a value which is reduced as an amount of reduction in the speed of movement is greater.

5. The apparatus of claim 4, further comprising a memory that stores a predetermined number M (M>

0) of the coordinates calculated by the first calculation section, wherein the setting section sets the number m to a calculation result of α

M(V₀/V) assuming that a reference speed of movement is V₀.

6. The apparatus of claim 5, wherein the value of the coefficient α

becomes smaller as the speed V of movement becomes smaller than an average speed V_avg of movement calculated using the M coordinates stored in the memory.

7. A coordinate recognition apparatus comprising:

a detection device that detects an operation performed by a user in an operation area;

a first calculation section that calculates coordinates of a position of the operation performed by the user while the user continuously maintains contact with the operation area, on the basis of the detection result of the detection device;

a second calculation section that multiplies each of a number of coordinates calculated by the first calculation section, by a particular weight value, and averages the coordinates obtained by multiplying the weight values, thereby calculating smoothed coordinates;

a detection section that detects a speed of movement of the operation position of the user in the operation area on the basis of the coordinates calculated by the first calculation section;

a setting section that updates the number of coordinates used to calculate the smoothed coordinates to be smaller as the speed detected by the detection section becomes higher and to be larger as the speed becomes lower while the user continuously maintains contact with the operation area; and

a controller via which the detection device, the first calculation section, the second calculation section, the detection section, and the setting section perform their respective operations.

8. The apparatus of claim 7, wherein the detection device is an optical detection device which includes a plurality of light-emitting elements, a plurality of light-sensing elements that are arranged to oppose the respective light-emitting elements and output detection signals corresponding to intensities of sensed light, and detects the operation of the user for the operation area between each of the light-emitting elements and each of the light-sensing elements.

9. The apparatus of claim 7, wherein the setting section sets the weight values to be reduced by a particular tolerance D.

10. The apparatus of claim 9, wherein the setting section determines the tolerance D so as to have a value in proportion to the speed of movement.

11. The apparatus of claim 7, wherein the setting section sets the weight values so that during a reduction in the speed of movement, the set weight values for newest coordinates are adjusted higher as an amount of the reduction in the speed of movement is greater.

12. A coordinate recognition method comprising:

detecting an operation performed by a user in an operation area, by a detection device;

calculating, via a controller, coordinates of the operation performed by the user and coordinates of additional positions of the operation as the user moves the position of the operation while the user continuously maintains contact with the operation area, on the basis of the detection result of the detection device;

multiplying, via the controller, each of a number of the calculated coordinates by a particular weight value, and averaging the coordinates, thereby calculating smoothed coordinates;

detecting a speed of movement of the operation position of the user in the operation area on the basis of the calculated coordinates of the operation; and

updating, via the controller, the number of the coordinates used to calculate the smoothed coordinates to be smaller as the detected speed becomes higher and to be larger as the detected speed becomes lower while the user continuously maintains contact with the operation area.

13. The method of claim 12, wherein, as the detection device, an optical detection device is used which includes a plurality of light-emitting elements, a plurality of light-sensing elements that are arranged to oppose the respective light-emitting elements and output detection signals corresponding to intensities of sensed light, and detects the operation of the user for the operation area between each of the light-emitting elements and each of the light-sensing elements.

14. The method of claim 12, wherein the speed of movement is calculated on the basis of the calculated coordinates.

15. The method of claim 12, wherein the weight value is set to be reduced by a particular tolerance D that is in proportion to the speed of movement.

16. The method of claim 12, wherein, during a reduction in the speed of movement, the set weight value for newest coordinates are adjusted to be relatively higher as an amount of the reduction in the speed of movement is greater.