Writing system

• US 20060279549A1
• Filed: 06/08/2005
• Published: 12/14/2006
• Est. Priority Date: 06/08/2005
• Status: Active Grant

• Current Assignee: Daka Research, Inc.
• Original Assignee: Daka Research, Inc.
• Inventors: Leong, Philip Heng Wai, Wong, Ming Yiu, Shi, Guangyi, Li, Wen Jung, Wong, Heidi Yee Yan, Luo, Yilun, Zhang, Guanglie
• Granted Patent: US 7,508,384 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/03545 Pens or stylus

Abstract

A Micro Inertial Measurement Unit (IMU) which is based on MEMS accelerometers and gyro sensors is developed for real-time recognition of human hand motions, especially as used in the context of writing on a surface. Motion is recorded by a rate gyro and an accellerometer and communicated to a Bluetooth module, possibly to a computer which may be 20 to 30 feet or more from the sensor. The motion information generated and communicated is combined with appropriate filtering and transformation algorithms to facilitate a complete Digital Writing System that can be used to record handwriting on any surface, or on no surface at all. The overall size of an IMU can be less than 26 mm×20 mm×20 mm, and may include micro sensors, a processor, and wireless interface components. The Kalman filtering algorithm is preferably used to filter the noise of sensors to allow successful transformance of hand motions into recognizable and recordable English characters. The immediate advantage is the facilitation of a digital interface with both PC and mobile computing devices and perhaps to enable wireless sensing.

Claims

2-1. The writing system as recited in claim 1 wherein said microcontroller includes an input for indicating a start and a finish of said two dimensional line path as a beginning and ending of writing.