SYSTEM AND METHOD FOR OCR OUTPUT VERIFICATION
First Claim
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1. A method for computing confidence comprising:
- with a text recognition system, performing character recognition on an input text image to generate a candidate string of characters;
generating a first representation based on the candidate string of characters;
generating a second representation based on the input text image;
computing a confidence in the candidate string of characters based on a computed similarity between the first and second representations in a common embedding space, at least one of the first and second representations being projected into the common embedding space; and
wherein at least one of the performing character recognition, generating the first representation, generating the second representation, and computing the confidence is performed with a computer processor.
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Abstract
A system and method for computing confidence in an output of a text recognition system includes performing character recognition on an input text image with a text recognition system to generate a candidate string of characters. A first representation is generated, based on the candidate string of characters, and a second representation is generated based on the input text image. A confidence in the candidate string of characters is computed based on a computed similarity between the first and second representations in a common embedding space.
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Citations
22 Claims
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1. A method for computing confidence comprising:
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with a text recognition system, performing character recognition on an input text image to generate a candidate string of characters; generating a first representation based on the candidate string of characters; generating a second representation based on the input text image; computing a confidence in the candidate string of characters based on a computed similarity between the first and second representations in a common embedding space, at least one of the first and second representations being projected into the common embedding space; and wherein at least one of the performing character recognition, generating the first representation, generating the second representation, and computing the confidence is performed with a computer processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for computing confidence comprising:
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a text image representation component which generates a text image representation based on features extracted from a text image; a text string representation component which receives a character string from an associated text recognition system as a candidate string for the text image and generates a character string representation based on features extracted from the character string; a comparison component which computes a confidence in the character string based on a similarity between the text image representation and the character string representation in a learned embedding space; an information output component which outputs information based on the computed confidence; and a processor which implements the text image representation component, text string representation component, comparison component, and information output component.
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22. A license plate recognition method comprising:
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performing optical character recognition on an image of a license plate to generate a character string as a candidate license plate number; computing a confidence in the candidate license plate number based on a function which embeds a representation of the license plate image and a representation of the candidate license plate number in an embedding space with a matrix of weights learned on an annotated set of license plate images; and where the confidence meets a threshold, outputting the character string as a recognized license plate number for the image of the license plate, otherwise initiating another process for license plate number recognition; wherein at least one of the performing, computing and outputting is performed with a processor.
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Specification