Creation device, computer program product, recognition system, and creation method

A creation device that creates a code table including a plurality of code words, the code table being used by an image forming device and a recognition device,

• the image forming device forming a code image representing a code word selected from the code table on an object,
• the recognition device identifying the code word represented by the code image based on a result of character recognition of the code image formed on the object, the code table, and a confusion matrix preliminarily created,
• the confusion matrix representing probabilities that characters represented by an image are recognized as the respective characters, when the image forming device forms, on the object, the image representing the characters, and the image recognition device performs character recognition on the image, and
• the creation device comprising:
• a change unit configured to change the code table;
• an evaluation value calculation unit configured to calculate, using the confusion matrix, a difference evaluation value representing a difference between a first evaluation value and a second evaluation value, the first evaluation value representing a possibility that the code word included in the changed code table is wrongly recognized, the second evaluation value representing a possibility that the code word included in the code table before the change is wrongly recognized;
• and
• a control unit configured to cause the change of the code table and the calculation of the difference evaluation value to be repeated such that the difference evaluation value is smaller than zero, and output the code table at a stage where a predetermined condition is satisfied.

A recognition system comprising:

• an image forming device configured to form a code image on an object, the code image representing a code word selected from a code table including a plurality of code words;
• a recognition device configured to identify the code word represented by the code image based on a result of character recognition of the code image formed on the object, the code table, and a confusion matrix preliminarily created;
• and
• a creation device configured to create the code table that is used by the image forming device and the recognition device, wherein
• the confusion matrix represents respective probabilities that characters represented by an image are recognized as the respective characters, when the image forming device forms, on the object, the image representing the characters, and the image recognition device performs character recognition on the image, and
• the creation device includes:
• a change unit configured to change the code table;
• an evaluation value calculation unit configured to calculate, using the confusion matrix, an evaluation value representing a possibility that the code word included in the changed code table is wrongly recognized;
• and
• a control unit configured to cause the change of the code table and the calculation of the evaluation value to be repeated such that the evaluation value becomes small, and output the code table at a stage where a predetermined condition is satisfied.

A creation method that is implemented by a creation device creating a code table including a plurality of code words, the code table being used by an image forming device and a recognition device,

• the image forming device forming a code image representing a code word selected from the code table on an object,
• the recognition device identifying the code word represented by the code image on the basis of a result of character recognition of the code image formed on the object, the code table, and a confusion matrix preliminarily created,
• the confusion matrix representing probabilities that characters represented by an image are recognized as the respective characters, when the image forming device forms, on the object, the image representing the characters, and the image recognition device performs character recognition on the image, the creation method comprising:
• by the creation device,
• changing the code table;
• calculating, using a confusion matrix, an evaluation value representing a possibility that the code word included in the changed code table is wrongly recognized;
• and
• causing the change of the code table and the calculation of the evaluation value to be repeated such that the evaluation value becomes small, and outputting the code table at a stage where a predetermined condition is satisfied.