Free-hand character recognition on a touch screen POS terminal
First Claim
1. A free-hand character recognition device comprising:
- an input device having stroke detection circuitry to accept input data from a user;
a character recognition engine instantiated using a processing system and a data store;
a network connection to a server; and
a memory storing instructions to;
conduct a user recognition procedure to obtain a user identifier from the user;
download a cipher from the server to the data store using the network connection and in exchange for the user identifier;
generate a prediction vector using the character recognition engine, the input data, and the cipher; and
recognize using the character recognition engine, the input data, and the cipher, at least two characters entered by the user via the touch screen;
wherein the user recognition procedure further comprises;
generating a feature vector using the input data and a feature detector; and
applying a product of the feature vector and the cipher to a hypothesis function to generate the prediction vector;
wherein the cipher is user-specific; and
wherein the cipher is a hypothesis vector.
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Accused Products
Abstract
Various methods and devices that involve character recognition on a touch display, or other input device, are disclosed. Some of these may facilitate the recognition of characters that are input by people with physical impairments such as those with limited eyesight. A disclosed free-hand character recognition device comprises: an input device having stroke detection circuitry to accept input data from a user; a character recognition engine instantiated using a processing system and a data store; and a network connection to a server. The device additionally comprises a memory storing instructions to: conduct an unobtrusive user recognition procedure to obtain a user identifier from the user; download a cipher from the server to the data store using the network connection and the user identifier; and generate a prediction vector using the character recognition engine, the input data, and the cipher.
20 Citations
24 Claims
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1. A free-hand character recognition device comprising:
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an input device having stroke detection circuitry to accept input data from a user; a character recognition engine instantiated using a processing system and a data store; a network connection to a server; and a memory storing instructions to; conduct a user recognition procedure to obtain a user identifier from the user; download a cipher from the server to the data store using the network connection and in exchange for the user identifier; generate a prediction vector using the character recognition engine, the input data, and the cipher; and recognize using the character recognition engine, the input data, and the cipher, at least two characters entered by the user via the touch screen; wherein the user recognition procedure further comprises; generating a feature vector using the input data and a feature detector; and applying a product of the feature vector and the cipher to a hypothesis function to generate the prediction vector; wherein the cipher is user-specific; and wherein the cipher is a hypothesis vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computer-implemented method comprising:
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conducting a user recognition procedure, using a processing system and an input device, to obtain a user identifier from a user; downloading a cipher from a server to a data store, wherein the cipher is provided from the server in exchange for the user identifier obtained in the unobtrusive user recognition procedure, and wherein the cipher uniquely corresponds to the user identifier; accepting input data from the user, using the processing system, a touch screen, and stroke detection circuitry; and recognizing, using the processing system, a character recognition engine, the input data, and the cipher, at least two characters entered by the user via the touch screen; wherein the recognizing further comprises; generating a feature vector using the input data and a feature detector; and applying a product of the feature vector and the cipher to a hypothesis function to produce a prediction vector; wherein the cipher is user-specific; and wherein the cipher is a hypothesis vector. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A point of sale terminal comprising:
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a touch screen having stroke detection circuitry to accept input data from a user; a character recognition engine instantiated using a processing system and a data store; a network connection to a server; and a memory storing instructions to; conduct a user recognition procedure to obtain a user identifier from the user; download a hypothesis vector from the server to the data store using the network connection and in exchange for the user identifier; generate a prediction vector using the character recognition engine, the input data, and the hypothesis vector; and recognize using the character recognition engine, the input data, and the hypothesis vector, at least two characters entered by the user via the touch screen; wherein the user recognition procedure further comprises; generating a feature vector using the input data and a feature detector; and applying a product of the feature vector and the hypothesis vector to a hypothesis function to produce a prediction vector; wherein the hypothesis vector is a user-specific cipher.
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Specification