Browse Prior Art Database

Character Disambiguation for Keypads using Fingerprint indentification Disclosure Number: IPCOM000015985D
Original Publication Date: 2002-Aug-24
Included in the Prior Art Database: 2003-Jun-21
Document File: 3 page(s) / 350K

Publishing Venue




This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 46% of the total text.

Page 1 of 3

Character Disambiguation for Keypads using Fingerprint indentification


This disclosure describes the design of a biometrics enhanced keypad and related supporting software for the text entry tasks on PvC devices. This keypad uses the implicit information contained in a user's different fingers to map multiple characters into one physical button. Our keypad maps multiple characters into one physical button and uses the implicit information contained in the user's different fingers to identify the user-wanted character from these characters. Our invention has the following novelities compared with traditional methods - 1. A method to disambiguate arbitrary inputs of multiple characters mapped to a physical button within one keystroke by identifying the action finger using the implicit information contained in different fingers.
2. A novel design of keypad with fingerprint scanner mounted on the key-face of each button. This keypad is also backward compatible with traditional keypad.

Description :

Text entry is one of the most important Human-Computer Interaction tasks in people's daily life. Up till now, the QWERTY style keyboard is still the most effective computer input accessory for text input. However, in the context of pervasive devices, especially mobile-phone, dummy phone terminal etc, due to requirements on portability & size, usually an 12-key standard keypad is the only input device available, making it difficult to input the 26 alphabet characters and punctuation marks. At the same time, emerging services such as text messaging for mobile phone are becoming widely accepted, making compelling requirement for effective text entry method which can be used by mobile systems.

At the current stage, people usually use the following two methods to map the 12-key numeric into multiple alphabet characters - 1. Multi-tap. 2. Dictionary driven predictive methods ( e.g. T9
) However, all those methods still suffers from the slow input speed and difficulty in error correction. With the rapid adoption of PvC devices, there exists compelling requirement for the accelerated text input methods on such devices.

Designers of input devices met new challenges with they enter the area of Pervasive text input. Due to the innate limation of such devices, tradeoffs must be made to design keypads used for mobile phones, PDAs.

First, due to the requirement of mobility, there are some compulsive requirements on the size and weight of pervasive devices. As a result, full sized QWERTY style are usually not available on those devices. At the same time, during using a reduced size keyboard, a user will also suffer from reduced hitting accuracy and longer time to finish a text entry task.


Page 2 of 3

Here we describe our novel method to enter alphabet characters from a reduced button number keypad (e.g.12-key ) The hardware part of our system is a specially designed button, shown in picture 1 & 2. We attach a fingerprint scanner on the key face of...