Character recognition device and method
A character recognition device capable of performing accurate character recognition even when positions of characters change or adjacent characters contact or overlap each other. The device includes a character recognition image data creating unit for extracting character string image data from image data generated by using an imaging modality and repeatedly shifting the character string image in a character string direction one pixel by one pixel to create plural kinds of character string image data; and a character recognition processing unit for separating character images from each character string image to obtain character pattern data representing the separated character images, performing character recognition by using the obtained character pattern data, and calculating certainty factors based on an agreement rate of recognition results to determine a recognition result character string based on the certainty factors with respect to the plural kinds of character string image data.
1 . A character recognition device for performing character recognition based on image data representing images including character information inputted from an imaging modality for a purpose of diagnosis, said device comprising:
character recognition image data creating means for extracting character string image data representing a character string image from image data generated by using said imaging modality and repeatedly shifting the character string image represented by the extracted character string image data in a character string direction at least one pixel by one pixel so as to create plural kinds of character string image data including the extracted character string image data; and
character recognition processing means for separating character images from each character string image represented by the plural kinds of character string image data to obtain character pattern data representing the separated character images, performing character recognition by using the obtained character pattern data, and calculating certainty factors based on an agreement rate of recognition results of the character pattern data to determine a recognition result character string based on the certainty factors with respect to the plural kinds of character string image data.
2 . A character recognition device according to claim 1 , wherein:
said character recognition image data creating means creates image data for character recognition in which the character string images represented by the plural kinds of character string image data are arranged in a direction different from the character string direction; and
said character recognition processing means separates character images from each character string image represented by the plural kinds of character string image data included in the image data for character recognition to obtain character pattern data representing the separated character images, and performs character recognition by using the obtained character pattern data.
3 . A character recognition device according to claim 1 , wherein when each of the plural kinds of character string image data is created by said character recognition image data creating means, said character recognition processing means separates character images from the character string image represented by said character string image data to obtain character pattern data representing the separated character images, and performs character recognition by using the obtained character pattern data.
4 . A character recognition device according to claim 1 , wherein said character recognition image data creating means creates plural kinds of character string image data in which vertical lines are drawn in a different color from a character color within the character string images represented by the plural kinds of character string image data on a pixel at a start position of the character color and every predetermined number of pixels from the start position of the character color.
5 . A character recognition device according to claim 4 , wherein said character recognition processing means performs character recognition by referring to character pattern data in which a color of pixels included in two lines at both ends of character images has been turned in a different color from the character color.
6 . A character recognition method of performing character recognition based on image data representing images including character information inputted from an imaging modality for a purpose of diagnosis, said method comprising the steps of:
(a) extracting character string image data representing a character string image from image data generated by using said imaging modality and repeatedly shifting the character string image represented by the extracted character string image data in a character string direction at least one pixel by one pixel so as to create plural kinds of character string image data including the extracted character string image data;
(b) separating character images from each character string image represented by the plural kinds of character string image data to obtain character pattern data representing the separated character images, and performing character recognition by using the obtained character pattern data; and
(c) calculating certainty factors based on an agreement rate of recognition results of the character pattern data to determine a recognition result character string based on the certainty factors with respect to the plural kinds of character string image data.
7 . A character recognition method according to claim 6 , wherein:
step (a) includes creating image data for character recognition in which the character string images represented by the plural kinds of character string image data are arranged in a direction different from the character string direction; and
step (b) includes separating character images from each character string image represented by the plural kinds of character string image data included in the image data for character recognition to obtain character pattern data representing the separated character images, and performing character recognition by using the obtained character pattern data.
8 . A character recognition method according to claim 6 , wherein when each of the plural kinds of character string image data is created at step (a), step (b) includes separating character images from the character string image represented by said character string image data to obtain character pattern data representing the separated character images, and performing character recognition by using the obtained character pattern data.
9 . A character recognition method according to claim 6 , wherein step (a) includes creating plural kinds of character string image data in which vertical lines are drawn in a different color from a character color within the character string images represented by the plural kinds of character string image data on a pixel at a start position of the character color and every predetermined number of pixels from the start position of the character color.
10 . A character recognition method according to claim 9 , wherein step (b) includes performing character recognition by referring to character pattern data in which a color of pixels included in two lines at both ends of character images has been turned in a different color from the character color.