Method for writing motion and trajectory recognition and writing apparatus and recognizing system

• US 8,259,092 B2
• Filed: 01/16/2009
• Issued: 09/04/2012
• Est. Priority Date: 05/27/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Hsuan-Lih, Chuang, Fang-Chen, Lee, Gwo-Yun
• Primary Examiner(s): Chow, Van
• Application Number:
  US12/355,241
• Publication Number:
  US 20090295758A1
• Time in Patent Office: 1,327 Days
• Field of Search: None
• US Class Current: 345/179
• CPC Class Codes: G06F 2203/0331 Finger worn pointing device
• CPC Class Codes: G06F 3/0317 in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
• CPC Class Codes: G06F 3/0346 with detection of the device orientation or free movement in a 3D space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/043 using propagating acoustic waves
• CPC Class Codes: G06V 30/1423 the instrument generating sequences of position coordinates corresponding to handwriting preprocessing or recognising digital ink G06V30/32

Abstract

The present invention provides a method for writing motion recognition, wherein a sound signal generated when a writing apparatus is contacting and moving on a writing surface is acquired. According to the occurrence of the sound signal, the writing apparatus can be determined whether it is on the writing surface or not. In another embodiment, the present invention further provides a method for writing trajectory recognition, wherein the foregoing method and character recognition techniques are combined to convert a writing trajectory into a character. In addition, the present invention further provides a writing apparatus and a recognition system, wherein a device is installed in the writing apparatus for collecting sound signal generated during the writing process and a processing unit which adapts the foregoing method is used to recognize the motion trajectory of the writing apparatus so as to form the corresponding character.

Claims

1. A writing trajectory recognition method, comprising steps of:

acquiring a sound signal generated when a writing apparatus is contacting and moving on a writing surface;

acquiring a continuous electronic signal generated due to motion variation of the writing apparatus;

setting a threshold value;

determining that the writing apparatus is on a writing status if the sound signal exceeds the threshold value, or determining that the writing apparatus is on a non-writing motion status if the sound signal is smaller than the threshold value;

converting the sound signal into a recognition sound signal comprising at least a writing sound signal;

comparing the recognition sound signal with the continuous electronic signal; and

performing a recognition and composition process on a signal corresponding to a position of the writing sound signal in the continuous electronic signal.

2. The writing trajectory recognition method as recited in claim 1, further comprising a step of filtering noise from the sound signal.

3. A writing trajectory recognition method, comprising steps of:

acquiring a sound signal generated when a writing apparatus is contacting and moving on a writing surface;

acquiring a continuous electronic signal generated due to motion variation of the writing apparatus;

converting the sound signal into a recognition sound signal comprising at least a writing sound signal;

comparing the recognition sound signal with the continuous electronic signal;

dividing the continuous electronic signal into a trajectory signal and a motion signal, wherein the trajectory signal corresponds to the signal corresponding to the position of the writing sound signal and the motion signal corresponds to a position of a non-writing sound signal;

determining at least a writing trajectory according to the trajectory signal;

determining a relative position of the writing trajectory according to the motion signal;

performing a composition process to compose the writing trajectory and the relative position of the writing trajectory; and

performing a text recognition process according to the composition process.