Character recognizing apparatus and non-transitory computer readable medium

1. A character recognizing apparatus comprising:

a processor programmed to:

acquire a string image that is an image of a string of characters generated in accordance with one of a plurality of string generation schemes;

perform first character recognition on the string image to determine whether the string satisfies one of predetermined rules including:

(i) a character at a predetermined position in the string is one of predetermined characters, and

(ii) the string includes a predetermined number of characters;

based on a determination whether the string satisfies one of the predetermined rules (i) and (ii), identify a particular string generation scheme that is used to generate the string among the plurality of string generation schemes, and specify a partial range within the string for second character recognition; and

perform the second character recognition on the partial range specified within the string.

2. The character recognizing apparatus according to claim 1 ,

wherein for each of the plurality of string generation schemes, a feature of a respective string generation scheme and a range specified for second character recognition in the respective string generation scheme are associated with an attribute of an object represented by a string generated in accordance with the respective string generation scheme, and

if a result of the first character recognition indicates a feature of the particular string generation scheme, the processor identifies an attribute with which the feature of the particular string generation scheme is associated and specifies the partial range for second character recognition based on the attribute.

3. The character recognizing apparatus according to claim 2 ,

wherein the attribute is a category to which an object represented by a string generated in accordance with one of the plurality of string generation schemes belongs.

4. The character recognizing apparatus according to claim 2 ,

wherein the feature of the particular string generation scheme is a rule concerning a string generated in accordance with the particular string generation scheme.

5. The character recognizing apparatus according to claim 4 ,

wherein the rule concerning a string is a rule in which a character at a predetermined position in the string is one of predetermined characters.

6. The character recognizing apparatus according to claim 4 ,

wherein the rule concerning a string is a rule in which the string includes a predetermined number of characters.

7. The character recognizing apparatus according to claim 4 ,

wherein the rule concerning a string is a rule in which the string includes at least one of predetermined characters or a rule in which the string includes none of the predetermined characters.

8. A non-transitory computer readable medium storing a program causing a computer to execute a process for character recognition, the process comprising:

acquiring a string image that is an image of a string of characters generated in accordance with one of a plurality of string generation schemes;

performing first character recognition on the string image to determine whether the string satisfies one of predetermined rules including:

(i) a character at a predetermined position in the string is one of predetermined characters, and

(ii) the string includes a predetermined number of characters;

based on a determination whether the string satisfies one of the predetermined rules (i) and (ii), identifying a particular string generation scheme that is used to generate the string among the plurality of string generation schemes, and specifying a partial range within the string for second character recognition; and

performing the second character recognition on the partial range within the string.

9. A method for character recognition comprising:

acquiring a string image that is an image of a string of characters generated in accordance with one of a plurality of string generation schemes;

performing first character recognition on the string image to determine whether the string satisfies one of predetermined rules including:

(i) a character at a predetermined position in the string is one of predetermined characters, and

(ii) the string includes a predetermined number of characters;

based on a determination whether the string satisfies one of the predetermined rules (i) and (ii), identifying a particular string generation scheme that is used to generate the string among the plurality of string generation schemes, and specifying a partial range within the string for second character recognition; and

performing the second character recognition on the partial range within the string.

10. The character recognizing apparatus according to claim 1 ,

wherein each of the plurality of string generation schemes has a corresponding preset target partial range for second character recognition, and the partial range specified is the preset target partial range for the particular string generation scheme.

11. The character recognizing apparatus according to claim 1 , wherein

the predetermined rules further include: (iii) the string includes at least one of preset special characters, and (iv) the string includes none of the preset special characters; and

the processor identifies the particular string generation scheme based on a determination whether the string satisfies one of the predetermined rules (i), (ii), (iii), and (iv).