JP2015090625A - Document reading device, program and document reading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document reading device which can contribute to improving character recognition accuracy while reducing a work load on an operator by decreasing a ratio of erroneous reading and un-reading to all reading regardless of a state of a document image, and further to provide a program.SOLUTION: A document reading device reads characters from an image of a document obtained by optically reading the document. The document reading device comprises a screen control section, a character recognition section, a recognition history storage section and a recognition control section. The screen control section displays a screen having display columns where the image of the document and the characters obtained as a result of character recognition. The character recognition section performs character recognition of a specified area of the image of the document. A character recognition result is stored as a recognition history in the recognition history storage section. The recognition control section searches for characters corresponding to the characters recognized in terms of characters by the character recognition section and character data candidates of recognition results having degrees of similarity equal to a predetermined value or more from the recognition history storage section and displays them in the display columns and in the vicinity thereof.

Description

  Embodiments described herein relate generally to a form reading apparatus, a program, and a form reading system that read characters from a form image.

  For example, in a form reading device such as a computer, a form image (digital photograph, etc.) obtained by an optical reading device such as a digital camera is used for character recognition using character recognition application software (hereinafter referred to as “OCR software”). The technology to do is known.

  Since character recognition may cause misreading and unread (unreadable) events, the graphic user interface screen (hereinafter referred to as “GUI screen”) of the form reading device shows the result of character recognition. A display field for the operator to check and correct the character data is provided so that the operator can check the correctness of the result of character recognition.

  And, if the character as a result of character recognition is not correct, that is, if the character is misread or unread, the character data displayed in the display field is directly corrected by key input, and the confirmation operation is performed for the first time. The result of character recognition is stored as entry information.

JP-A-2005-216102

  By the way, the image of the optically read form is not always in a good state and sometimes in a blurred state. In such a case, the rate at which the result of character recognition is misread or unread increases, and the greater the number of read items in the form, the greater the work load on the operator who corrects misread or unread.

  The problem to be solved by the present invention is to reduce the rate of misread or unread regardless of the state of the form image, thereby reducing the work burden on the operator and contributing to improving the character recognition accuracy. And providing a form reading system.

  The form reading apparatus according to the embodiment is a form reading apparatus that reads characters from a form image obtained by optically reading a form, and includes a screen control unit, a recognition history storage unit, and a recognition control unit. The screen control unit displays a screen having a display field for displaying a form image and character data obtained as a result of character recognition from the image. The character recognition unit recognizes the image portion of the designated area of the form image. The recognition history storage unit stores character recognition results as a recognition history. The recognition control unit searches the recognition history storage unit for characters that match the character data recognized by the character recognition unit and the recognition result character data candidates whose similarity is equal to or greater than a certain value, and displays them in the display field and the vicinity of the display field. .

It is a figure which shows the structure of the form reading system of 1st Embodiment. It is a figure which shows the structure of the tablet of a form reading system. It is a figure which shows the content of form image DB. It is a figure which shows the content of recognition log | history DB. It is a figure which shows the content of the form definition body DB. It is a figure which shows the content of character type dictionary DB. It is a figure which shows the content of entry information DB. It is a figure which shows an example of the entry screen which displayed the form image. It is a flowchart which shows operation | movement of the form reading system of 1st Embodiment. It is a figure which shows the example of a display of the result of having normally recognized the form image. It is a figure which shows the example of a display when a previous recognition result (history information) is contained in recognition history DB. It is a figure which shows a mode that an operator operates with respect to an entry screen. It is a figure which shows the content of recognition log | history DB. It is a figure which shows operation | movement of 3rd Embodiment. It is a figure which shows the content of recognition log | history DB in 5th Embodiment. It is a figure which shows the content of recognition log | history DB in 6th Embodiment. It is a figure which shows the structure of the form reading system of 7th Embodiment. It is a figure which shows the structure of the tablet of the form reading system of 7th Embodiment. It is a flowchart which shows operation | movement of the form reading system of 7th Embodiment.

  Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a form reading system according to the first embodiment.

(First embodiment)
As shown in FIG. 1, the form reading system according to the first embodiment includes a tablet terminal 1 as an electronic device, a portable terminal or a terminal device, and an external system 8 connected to the tablet terminal 1 via a network 7. Prepare. The external system 8 is, for example, a server computer.

  The tablet terminal 1 includes a camera unit 2 as an image acquisition unit, a touch panel 3, a CPU 4, a memory 5, a communication interface 6 (hereinafter referred to as “communication I / F 6”), and the like.

  In the tablet terminal 1, the CPU 4 reads out the software stored in the memory 5 and executes processing of the software, whereby the tablet terminal 1 functions as a form reading device that reads the form.

  The camera unit 2 is, for example, a CCD camera or the like, and captures, that is, optically reads a form image (form image) of a form to be read, for example, form A, and stores the read form image in the memory 5. As the imaging unit, in addition to the camera unit 2 built in the terminal 1, for example, a digital camera including an externally connected CCD sensor or the like may be used.

  The touch panel 3 has two functions of information display and input, and displays a form image captured by the camera unit 2 on the liquid crystal screen and also displays an image (a picture or a photograph) displayed on the liquid crystal screen by the operator. By touching a point or region with a hand, information on the touched screen position is sensed and output as operation information (signal). That is, the touch panel 3 can display a form image 71 (see FIGS. 3 and 8) captured by the camera unit 2 and can be touched.

  The memory 5 includes a form image database 12 (hereinafter referred to as “form image DB 12”) (see FIG. 3), a recognition history database (recognition history DB 43) (see FIG. 4), a form definition database (form definition DB 41) ( A storage area such as a character type dictionary database (character type dictionary DB 42) (see FIG. 6) is set.

  A form image 71 (see FIG. 8) acquired by the camera unit 2 is stored in the form image DB 12 (details will be described later). The memory 5 stores a form definition DB 41 and a character type dictionary DB 42. The form definition DB 41 stores definition information for character recognition for each form ID. The character type dictionary DB 42 is a character type dictionary set for each form ID or each entry item. The memory 5 functions as a work area when a form image is processed by each unit. The communication I / F 6 communicates with the external system 8 through the network 7.

  The CPU 4 can select the form image 71 and the item name of the character to be read from the form image 71 by a method such as a check box (hereinafter referred to as “check box”) 72 and display of the recognition result corresponding to each item name. It functions as a screen control unit that displays an entry screen 70 (see FIG. 7) having a column 73 on the touch panel 3.

  When the operator designates a desired item name and an area to be read corresponding to the item name by a touch operation on the item name check box 72 on the entry screen 70, the CPU 4 displays the image portion of the designated area as a character. It recognizes and stores the obtained character data, item name information and area position information in association with each other in the memory 5 and functions as a character recognition unit for displaying the character data in the recognition result display column 73.

  As shown in FIG. 2, the function of the form reading system includes an image acquisition unit 10, a screen control unit 20, a character recognition unit 40, an entry information update unit 50, and the like.

  The image acquisition unit 10 includes a camera unit 2, a form image writing unit 11, and a form image database 12 (hereinafter referred to as “form image DB 12”) as a form image storage unit. The camera unit 2 optically reads the form A and acquires an image of the form. The form image writing unit 11 acquires the form image 71 acquired by the camera unit 2 and stores (writes) it in the form image DB 12. Each DB is constructed in the storage area of the memory 5. That is, the image acquisition unit 10 stores the form image 71 acquired by the camera unit 2 in the memory 5.

  As shown in FIG. 3, the form image DB 12 stores a form ID for each form image 71 and binary data (also referred to as image data or image data) corresponding to each form ID.

The screen control unit 20 includes a form image reading unit 21, a screen generation unit 22, an OCR target form receiving unit 23, an OCR target entry item receiving unit 24, and an OCR target entry item area receiving unit 25.
OCR is an abbreviation for optical character recognition (optical character recognition) or optical character reader (optical character reader), and here refers to the former.

  The screen control unit 20 includes a display field for the form image 71, an item name display field for the entry item of characters to be read from the form image 71, a check box 72, and a recognition result display field 73 corresponding to the entry item name. A screen 70 (see FIG. 8) is displayed (output) on the touch panel 3. That is, the screen control unit 20 displays the entry screen 70 having a display field for displaying the form image 71 and character data obtained as a result of character recognition from the form image 71.

  When the desired position of the form image 71 is designated by the tap operation, the screen control unit 20 specifies the area of the character image to be read existing at the designated position, and sets the area as the area to be recognized. In addition, a desired area of the form image 71 may be specified by specifying the start point and the end point by a slide operation, and the area of the character image to be read may be specified as the area to be recognized.

  The form image reading unit 21 reads out the form image 71 stored in the form image DB 12 and passes it to the screen generation unit 22 to display the form image 71 on the entry screen 70.

  The screen generation unit 22 generates and displays an entry screen 70, and displays on the entry screen 70 a thumbnail list of the form image 71 passed from the form image reading unit 21 and a form image 71 of a thumbnail specified from the thumbnail list. To do.

  The screen generation unit 22 extracts the item name of the entry item of the processing target form A by referring to the form definition DB 41 using the input form ID as a keyword, and vertically displays the entry item list at the left end of the entry screen 70. indicate.

  In this example, the entry item associated with the form A is extracted. However, the entry item may be extracted in batch units, and the present embodiment is not limited to the method of extracting the entry item. Further, although the entry item list is displayed vertically, the display method may not be limited to the vertical.

  The OCR target form receiving unit 23 displays the tapped (selected or designated) form image 71 of the thumbnails of the form image 71 displayed on the entry screen 70 on the entire entry screen 70 as an image to be read.

  The OCR target entry item receiving unit 24 activates, for example, the entry item tapped (selected or designated) in the check box 72 in the entry item list displayed on the entry screen 70.

  The OCR target entry item area receiving unit 25 detects a tap operation performed on the form image 71 after tapping the check box 72 of the entry item, and specifies a character recognition target area from the tap position. There are several methods for specifying the character recognition target area. As an example, an image in a certain range (rectangular range) in the horizontal direction from one tapped point is set as a character recognition target.

  The character recognition unit 40 includes an OCR engine 44 as a character recognition unit, a recognition history DB 43, a recognition result control unit 45, a form definition DB 41, and a character type dictionary DB 42.

  When a desired entry item and an area to be read corresponding to the entry item are designated by a touch operation on the entry screen 70, the OCR engine 44 recognizes the designated area as characters. A character recognition dictionary set in advance is used for character recognition.

  The OCR engine 44 performs a verification process on the recognition result character. Specifically, the OCR engine 44 compares the number of characters to be printed in the reading target area (the number of characters set in advance) with the number of characters of the recognition result actually recognized, and checks whether or not they match. In addition to the number of characters, this is also done for character types. Only character type verification processing may be performed.

  The OCR engine 44 compares the character type and / or number of characters obtained as a result of character recognition with a preset character type and / or number of characters for each item, and outputs an alert if they do not match.

  The recognition result control unit 45 searches the recognition history DB 43 using the character data obtained as a result of character recognition by the OCR engine 44 as a keyword, and if the character data does not exist in the recognition history DB 43, character recognition result character data obtained from the OCR engine 44 and The item name information and the area position information are associated with each other and stored in the memory 5 (recognition history DB 43).

  Further, as a result of searching the recognition history DB 43, when a character that matches the character data recognized by the OCR engine 44 and a character data candidate of a recognition result having a similarity greater than or equal to a certain value are searched, the recognition result control unit 45 Character data candidates are displayed in the vicinity of the display field 73 and the display field 73.

  The recognition control unit 45 is character data that is tapped (selected) by the operator among character data or character data candidates displayed in the display field 73 or in the vicinity of the display field 73, character data candidates, or character data that is key-input to the display field 73. Is confirmed as a result of character recognition and stored in the recognition history DB 43.

  As shown in FIG. 4, the recognition history DB 43 stores at least an ID that is an identifier of the form image 71 or an ID of an entry item and character data of a recognition result corresponding to each ID.

  More specifically, the recognition history DB 43 stores a recognition result in which the recognition result character data corresponds to the character image cut out from the form image 71 at the time of reading and the position information of the reading range.

  As shown in FIG. 5, in the form definition DB 41, item names, definition information (character types), definition information (number of characters), and the like are stored in association with item IDs. ID is an identifier (identification information) for identifying an item. The item name is, for example, “name”, “address”, “phone number”, etc. The definition information (character type) is, for example, “kana”, “kanji”, and the definition information (number of characters) is “20”, “50”. , “10” and the like are set. In addition, character size and the like are set as definition information.

  In other words, the form definition DB 41 stores definition information corresponding to entry items (form format for reading characters from form images, item names, and attribute information of characters to be read corresponding to items). The definition information includes, for example, the name of the item to be recognized (item name), the size of characters to be written in the reading area (reading position) corresponding to the item, the character type, the number of characters, and the like.

  As shown in FIG. 6, the character type dictionary DB 42 stores IDs, types, and rules for identifying different dictionaries of a plurality of character types in association with each other. The ID is a numerical value such as “1” or “2”, the type is “Kana”, “English”, or the like. The rule is “Kana”, “Aiueo ...”, “English”, “ abcdef ... "and the like are set.

  That is, the character type dictionary DB 42 stores a character type dictionary of characters to be described for each item, and is used by the OCR engine 44 in character recognition. The OCR engine 44 reads a dictionary associated with the character type obtained from the form definition DB 41 from the character type dictionary DB 42.

  The entry information update unit 50 includes an entry information DB 51, an entry information writing unit 52, and an entry information transmission unit 53.

  As shown in FIG. 7, the entry information DB 51 stores item names, recognition results, form IDs, coordinates, and the like in association with each other. The item name is, for example, “name”, “address”, “telephone number”, etc. The recognition result is “○ × Taro” if the item name is “name”, “1-11 X town X-11, Tokyo XX” if the item name is “address”, and “ 0123456789 ”or the like. The coordinates are stored as a pair of x and y coordinates of four points of a rectangular vertex that two-dimensionally shows the area to be read.

  That is, in the entry information DB 51, the item name, the recognition history of the recognition history DB 43, the form ID associated with the form received by the OCR target form receiving unit 23, and the area received by the OCR target entry item area receiving unit 25. Information (x coordinate, y coordinate) and the like are stored.

  The entry information writing unit 52 reads the recognition history from the recognition history DB 43 and writes it in the entry information DB 51. The entry information transmission unit 53 transmits information stored in the entry information DB 51 to the external system 8 through the network 7.

  As shown in FIG. 8, in the entry screen 70, a form image 71 to be read is displayed on the entire screen, and an item name of a character to be read from the form image 71 and an instruction to read the item name are given. Check box 72 and a recognition result display field 73 corresponding to each item are displayed on the left side of the screen. In this example, ID, name, address, telephone number, date of birth, etc. are illustrated as item names of characters to be read.

  Next, the operation of the form reading system according to the first embodiment will be described with reference to FIG. First, the operation of this form reading system will be described with reference to the flowchart of FIG.

  In the case of this form reading system, when an operator turns on the tablet terminal 1 and activates character recognition application software which is a character reading program, an entry screen 70 is displayed on the touch panel 3.

  Subsequently, when the operator operates a form capture button (not shown) on the entry screen 70 in order to convert the paper form A into electronic data, the image acquisition unit 10 activates the camera unit 2 and activates the entry screen 70. To the monitor screen for camera imaging.

  When the operator looks at the monitor screen and puts the form A to be processed in the monitor screen and shoots, the camera unit 2 outputs the captured form image 71 to the form image writing unit 11. The form image writing unit 11 writes the photographed form image 71 in the form image DB 12. The form image 71 is taken in as many as the number of forms A taken, that is, one or more sheets. After the photographing of the form A is completed, the entry screen 70 is displayed when the monitor screen is closed.

  Here, when the operator taps a form image read button (not shown) on the entry screen 70, the screen control unit 20 reads one or more thumbnails of the form image 71 stored in the form image DB 12, and enters the entry. A thumbnail list of the form image 71 and a message prompting the user to select a desired thumbnail from the thumbnail list are displayed on the screen 70.

  Here, when the operator selects a desired thumbnail from the thumbnail list, a form recognition target form image 71 corresponding to the designated thumbnail is read from the form image DB 12 and displayed on the entire entry screen 70 for operation. (Step S101 in FIG. 9).

  Here, when the operator selects the check box 72 of the item name on the entry screen 70 with a finger and then specifies the OCR area of the form image 71 (Yes in step S102), the screen control unit 20 displays the specified OCR. The area is received, and the character image in the OCR area is specified as a reading target.

  The OCR engine 44 cuts out the identified character image, reads out the form definition corresponding to the ID of the read form image 71 from the form definition DB 41, reads out the dictionary of the character type corresponding to the ID from the character type dictionary DB 42, Character recognition is performed on the character image cut out from the OCR area with reference to these (step S103), and the result of character recognition ((item name, character and character image) is hereinafter referred to as “recognition result”) is the recognition control unit 45. To pass.

  The recognition control unit 45 uses the recognition result character data as a keyword, and recognizes a recognition result in the recognition history DB 43 that matches the keyword or is similar to a certain percentage (hereinafter referred to as “history information to distinguish the current recognition result”. Is searched (step S104).

  As a result of this search, if history information that completely matches the keyword exists in the recognition history (Yes in step S105), the recognition control unit 45 reads the history information from the recognition history DB 43 and sends it to the screen generation unit 22. The character data included in the history information is displayed in the display field 73 (step S106).

  On the other hand, when there is no history information that completely matches the keyword (No in step S105), the recognition control unit 45 registers the recognition result sent from the OCR engine 44 in the recognition history DB 43 (step S107).

  As a result of the search, if there is history information in the recognition history in the recognition history DB 43 that matches a certain ratio or more with the keyword (Yes in step S108), the recognition control unit 45 sets the history information (previous recognition result). ) Is read from the recognition history DB 43 and sent to the screen generation unit 22.

  In this case, the screen generation unit 22 performs conversion prediction as if both the character data candidate included in the history information sent from the recognition control unit 45 and the character data of the recognition result recognized by the OCR engine 44 are used. In this manner, the display field 73 and the vicinity (lower part) of the display field 73 are displayed side by side (step S109).

  If there is no history information that matches the keyword in a certain proportion or more from the history information (No in step S108), the recognition control unit 45 displays the character data included in the recognition result sent from the OCR engine 44 as usual. 73 (step S106).

  Here, referring to FIG. 10 to FIG. 12, an example of the recognition result when the character data is normally recognized from the first form image 71a and the character data from the different form image 71b after that are misread or rejected (unread) ) Will be described.

  As shown in FIG. 10, when the image of the area corresponding to, for example, the “name”, “address”, and “phone number” items of the first form image 71a is recognized, the recognition control unit 45 searches the recognition history DB 43. As a result, since there is no previous data in the recognition history DB 43, the recognition history DB 43 stores the normal recognition result by the OCR engine 44 in the recognition history DB 43. “Taro” and “Address” are stored (new registration) “012-345-6789” and “012-345-6789” are stored in the “Telephone Number” item, and are displayed in the respective display fields 73. Is done.

  Thereafter, a form image different from the first form image 71a, for example, a form image 71b is displayed on the entry screen 70 as shown in FIG. 11, and the areas corresponding to the items of “name”, “registration”, and “phone number” are displayed. Assume that the image has been recognized.

  At this time, when reading the area corresponding to the item “Personal registry”, rejected (unread: all or some of the characters could not be recognized as characters and “?” Was assigned to the event “Tokyo XX City? 11 ") occurs.

  In this case, when the recognition control unit 45 searches the recognition history DB, the previous recognition result “Tokyo city XX city X town 1-11” similar to the rejected character “Tokyo city XX city? Therefore, the recognition control unit 45 displays the rejected character “Tokyo Metropolitan XX City? Machi 1-11” in the display field 73 corresponding to the item “Personal Register” and a similar recognition history DB. History information “Tokyo city XX city X town 1-11” is read out, and both characters “Tokyo city XX city? Town 1-11” and “Tokyo city XX city X town 1-11” are displayed at the bottom of the display column 73. It is displayed as a character data candidate to be selected.

  The operator confirms the character data candidates displayed in the display field 73 of the entry screen 70, and selects and taps the correct character data candidate as shown in FIG. 12, so that the tapped character is stored in the recognition history DB. Reflected in the recognition history (history information), that is, the recognition history DB is updated.

  After this operation (operation) is repeated and character data of a desired item is obtained as an operator, when the operator taps an entry completion button (not shown) on the entry screen 70, the entry information update unit 50 recognizes the recognition history DB 43. Then, the recognition history is taken in, converted into information of a certain entry format, the contents of the entry information DB 51 are updated, and then transmitted to the external system 8.

  As described above, according to the first embodiment, from the recognition history DB 43 as character data candidates for entering character data that matches the character data recognized by the OCR engine 44 and character data having a recognition result with a similarity greater than or equal to a certain value. The search is performed and displayed in the display column 73 and the lower part of the display column 73 (near the display column), and the selected character data candidate among the character data candidates displayed on the entry screen 70 is determined as a result of character recognition, and the recognition history DB 43 Therefore, the ratio of rejection is reduced regardless of the state of the form image 71, thereby reducing the work load on the operator and contributing to the improvement of character recognition accuracy.

(Second Embodiment)
Subsequently, the second embodiment will be described with reference to FIGS. 13 and 14. The second embodiment has almost the same configuration as the first embodiment, and the contents of the recognition history DB 43 and the search function of the recognition control unit 45 are different. This point will be described.

  As shown in FIG. 13, the second embodiment includes a recognition history DB 43 in which a recognition result and a confirmation flag are stored corresponding to an item ID. This is an identifier indicating that the operator has confirmed the character data of the recognition result. The confirmation flag “1” indicates that the character data of the recognition result has been confirmed and registered. The confirmation flag “0” indicates that the character data of the recognition result is registered without being confirmed.

  The recognition control unit 45 assigns (adds) a confirmation flag “1” or “0” to the character data of the recognition result, stores it in the recognition history DB 43, and searches the recognition history DB 43 from the recognition result obtained from the OCR engine 44. In this case, the character data candidates are searched from the character data to which the confirmation flag “1” is assigned.

  In the first embodiment, the operator taps the selection candidate character data displayed on the entry screen 70 to reflect the tapped selection candidate character data in the recognition history (history information) of the recognition history DB. In the second embodiment, when a desired character is tapped from among the selection candidate characters, the recognition control unit 45 determines that the tap operation is a “confirm” operation and confirms it as a recognition result character in the recognition history DB. A flag “1” is assigned (set).

  When registering new character data, the recognition control unit 45 sets the confirmation flag “0” in the record of the corresponding ID in the recognition history DB 43 when automatically registering the first character data from the OCR engine 44. Set.

  Then, when the recognition control unit 45 searches the recognition history DB 43 using the character data of the recognition result recognized next as a keyword as a keyword, only character data for which the confirmation flag is set to “1” is set as a search target. Characters that match the keywords or characters that are more than a certain percentage are extracted from the recognition history DB 43.

Here, the operation of the second embodiment will be described.
In this second embodiment, the recognition control unit 45 determines that the character data of the recognition result has been confirmed as a recognition result by tapping, and registers the confirmed recognition result in the recognition history DB 43. A confirmation flag “1” is set in the record.

  Next, when a new recognition result is obtained, the recognition control unit 45 selects character data that matches the keyword or is similar to a certain percentage or more from the character data in which the confirmation flag “1” is set in the recognition history DB 43. Since the search is performed, the previously rejected result of the search result from the recognition history DB 43 is not displayed on the entry screen 70 as the character data candidate to be selected.

  As described above, according to the second embodiment, the confirmation flag is added to the recognition history DB 43, and the character data is searched from the character data in which the confirmation flag “1” is set. The result is not displayed on the entry screen 70 as a character data candidate to be selected, and the operator can select and enter a more reliable character as a recognition result.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. The third embodiment has substantially the same configuration as the second embodiment, and the operation of the recognition control unit 45 is different, so this point will be described.

  In the second embodiment, the character data candidates to be selected are displayed in the lower part of the display column. However, in the third embodiment, the recognition control unit 45 searches the recognition history DB 43 for the recognized recognition result. The history information (character data) is directly corrected (automatically corrected) in the display field 73 of the entry screen 70.

  That is, in this case, when the character that cannot be recognized by the OCR engine 44 is included, the recognition control unit 45 uses the similarity data retrieved from the recognition history DB 43 using other character data recognized from the same area. High character data candidates are displayed in the display column 73 as character data of recognition results.

  In the third embodiment, as shown in FIG. 14, when the OCR engine 44 is rejected (step S81), the recognition control unit 45 searches the recognition history DB 43 using the character data of the recognition result by the OCR engine 44 as a keyword. If there is character data that matches or is more than a certain percentage among characters to which the confirmation flag “1” is assigned, the character data is read from the recognition history DB 43 (step S82), and the display field 73 of the entry screen 70 is displayed. The correction is directly input to (step S83). FIG. 14 shows the contents of the recognition history DB 43 in an easily understandable manner.

  Therefore, the operator can move to the next item only by confirming the character data displayed in the display field 73 of the entry screen 70.

  As described above, according to the third embodiment, the recognition control unit 45 automatically corrects the recognition result rejected by the OCR engine 44 using the result retrieved from the recognition history DB 43. It is only necessary to confirm the contents, and work efficiency can be improved.

(Fourth embodiment)
Next, a fourth embodiment will be described. The fourth embodiment has almost the same configuration as the third embodiment, and the function of the recognition control unit 45 is different, so this point will be described.

  In the third embodiment, the character data obtained as a result of the search by the recognition control unit 45 is directly input to the display field 73 of the entry screen 70. However, in the fourth embodiment, the character input to the display field 73 is correct. If it is not, the correction of characters by manual input is allowed.

  In this case, the character read from the recognition history DB 43 by the recognition control unit 45 for the recognition result rejected by the OCR engine 44 is displayed in the display field 73 of the entry screen 70.

  Here, as a result of confirmation by the operator, if the character data displayed in the display column 73 is different from the characters in the area to be read of the form image 71, the operator can directly input the characters displayed in the display column 73. By making a correction and tapping a confirmation button (not shown) on the entry screen 70, the recognition control unit 45 reflects the character data in the display field 73 corrected by key input in the recognition history of the recognition history DB 43. The recognition result recognized by the OCR engine 44 may be displayed in the display field 73, and the result corrected by key input may be reflected in the recognition history of the recognition history DB 43.

  As described above, according to the fourth embodiment, since the correction function for the character data of the recognition result displayed in the display field 73 is provided, reliable data can be accumulated based on the recognition history of the recognition history DB 43. The character recognition accuracy can be improved. If a rejection occurs, the display field 73 may be left blank without executing the search process, and the operator may be allowed to key in all character data.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIG. The fifth embodiment has almost the same configuration as the second embodiment, and the contents of the recognition history DB 43 and the search function of the recognition control unit 45 are different. This will be described.

  In the second embodiment, the recognition control unit 45 searches for a character to which a confirmation flag is assigned, but in the fifth embodiment, as shown in FIG. In addition, in the recognition history DB 43, item names are stored in association with the item IDs in addition to the characters of the recognition result. That is, the recognition control unit 45 stores the character data of the recognition result in association with the item name to which the character data belongs in the recognition history DB 43, and searches the character data from the item name when searching the recognition history DB 43. .

  In the fifth embodiment, when the characters of the same item as before are obtained as the recognition result of the OCR engine 44, the recognition control unit 45 searches the recognition history DB 43 from the same items, thereby setting the search target to the same item. Search by narrowing down to.

  As described above, according to the fifth embodiment, when character data of the same item is recognized by associating a plurality of recognition result character data with the same item and registering them in the recognition history DB 43, By searching for character data from the inside, the search target can be narrowed down, and the time from the start of character recognition to the display of the search result can be shortened.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIG. The sixth embodiment has substantially the same configuration as the fifth embodiment, and the contents of the recognition history DB 43 and the search function of the recognition control unit 45 are different. This point will be described.

  In the fifth embodiment, the item name is associated with the item ID of the recognition history DB 43. However, in the sixth embodiment, as shown in FIG. The DB 43 stores item groups in addition to character data and item names as recognition results in association with item IDs. That is, the recognition control unit 45 stores the character data of the recognition result in association with the item group to which the character data belongs in the recognition history DB 43, and searches the character data from the item group when searching the recognition history DB 43. .

  In the sixth embodiment, when character data belonging to the same item group as before is obtained as a recognition result of the OCR engine 44, the recognition control unit 45 searches the recognition history DB 43 from the same item group, thereby performing a search. Search by narrowing the target to the item group.

  As described above, according to the sixth embodiment, the item group and the item name are associated with the character data of the recognition result and registered in the recognition history DB 43. By searching for character data from the item group, the search target can be narrowed down to the same item group, and the time required for character recognition can be shortened.

(Seventh embodiment)
Subsequently, the seventh embodiment will be described with reference to FIGS. 17 to 19. Note that the same reference numerals in the seventh embodiment denote the same parts as in the first to sixth embodiments, and a description thereof will be omitted.

  As shown in FIG. 17, the form reading system of the seventh embodiment includes a tablet terminal 1 as an electronic device or a portable terminal, an external system 8 connected to the tablet terminal 1 via a network 7, and a network 7 And an external character recognition system 82 (for example, a system that exists as a cloud service) connected via the Internet.

  As illustrated in FIG. 18, the tablet terminal 1 includes an image acquisition unit 10, a screen control unit 20, a character recognition request unit 401, a character recognition confirmation unit 402, and an entry information update unit 50. An external character recognition system 82 is connected to the network 7. The external character recognition system 82 is connected to the tablet terminal 1 via the network 7. The external character recognition system 82 includes a character recognition unit 811, a form definition DB 8141, and a character type dictionary DB 8142.

  The character recognition requesting unit 401 cuts out a part of the form image based on the form image specified by the OCR target form receiving unit 23 and the entry item coordinates specified by the OCR target entry item area receiving unit 25. Image cutout unit 4011, a cutout image data file cut out by the image cutout unit 4011 (hereinafter referred to as “cutout image file”), and entry item items designated by the OCR target entry item receiving unit 24 And a character recognition request transmission / reception unit 4012 that requests the external character recognition system 81 connected to a network or the like to perform character recognition.

  The character recognition request transmission / reception unit 4012 sends the cut-out image file and the item name of the entry item specified by the OCR target entry item reception unit 24 to the external character recognition system 81 to request character recognition. The character data of the character recognition result received from the external character recognition system 81 is received.

  The character recognition confirmation unit 402 includes an entry item content generation unit 4021 that generates entry item content based on the entry item name and character data obtained as a result of character recognition entered as the item content, and a recognition result storage unit 43.

  The entry item content generation unit 4021 searches the recognition history DB 43 for a recognition result character data candidate that matches or is similar to the received recognition result character data (hereinafter referred to as “recognition result character data”) or a similarity value, and displays the entry screen. It functions as a recognition control unit for displaying in the corresponding display field 73 and the vicinity of the display field 73.

  That is, the tablet terminal 1 according to the seventh embodiment includes a screen control unit 20 that outputs an entry screen 70 having a display field in which a form image 71 and character data obtained as a result of character recognition from the form image 71 are displayed, and a form. A character recognition request unit 401 that transmits an image portion of the designated area of the image 71 as an image file to the external character recognition system 81 to request character recognition; a recognition history DB 43 in which character recognition results are stored as a recognition history; In response to the character recognition request, a recognition result character data candidate that matches or is similar to the recognition result character data received from the external character recognition system 81 is searched from the recognition history DB 43, and the corresponding entry screen 70 is displayed. A column 73 and an entry item content generation unit 4021 to be displayed in the vicinity of the display column 73.

Next, the operation of the form reading system according to the seventh embodiment will be described with reference to FIG.
In the case of the seventh embodiment, the camera unit 2 captures the form A, and the captured form image 71 is written into the form image DB 12 by the form image writing unit 11.

  When all of the target forms have been photographed, the process ends. When all of the target forms have not been photographed, the above photographing process is repeated.

  Subsequently, when the operator taps a form image reading button (not shown) on the entry screen 70, the form image reading unit 21 of the screen control unit 20 has one or more form images 71 stored in the form image DB 12. And a thumbnail list of the form image 71 is displayed on the entry screen 70 of the touch panel 3.

  Here, when the operator selects a desired thumbnail from the thumbnail list on the entry screen 70 and taps the touch panel 3 (designates a thumbnail), the OCR target form accepting unit 23 accepts the designation of the thumbnail, and the designated thumbnail. The form image 71 corresponding to is determined as an OCR object, and is displayed for operation on almost the entire entry screen 70 (see FIG. 8) (step S501 in FIG. 19).

  Subsequently, when the operator selects the item name check box 72 on the entry screen 70 and taps it with his / her finger to specify the item name of the entry item, the OCR target entry item receiving unit 24 specifies the item name of the OCR target entry item. Accept.

  Here, when the operator taps the OCR portion of the form image 71 of the touch panel 3 (entry screen 70) with a finger and designates the reading area (starting point) with a point (Yes in step S502), the OCR target entry item area The receiving unit 25 receives the pointed position and displays a frame line 80 that surrounds the character image in a certain direction (horizontal direction) from the position.

  Then, the image cutout unit 4011 of the character recognition requesting unit 401 cuts out a character image from the form image 71 based on the item name of the entry item specified by the frame line 80 and the coordinates of the reading area, and an image file (hereinafter, “ The character recognition request transmission / reception unit 4012 transmits the cut image file together with the item name of the entry item to the external character recognition system 81 via a network or the like to request character recognition (step S503). ).

  The external character recognition system 81 recognizes characters in the clipped image file received from the tablet terminal 1 by the character recognition unit 811, associates the recognition result character data with the item name of the target entry item, and enters the entry from the form definition DB 8141. Read the definition information 1 (character type, for example, kanji) and the definition information 2 (number of characters, for example, 20) of the corresponding item name (for example, name) of the item definition body and the character type dictionary from the character type dictionary DB 8142 and refer to these information Then, the character recognition result is confirmed, and the confirmed recognition result is verified. After the verification process, the item name and character data of the entry item are transmitted to the character recognition request transmission / reception unit 4012 of the tablet terminal 1 via the network (step S504).

  In the tablet terminal 1, when the character recognition request transmission / reception unit 4012 receives the recognition result character data sent from the external character recognition system 81, the character recognition request transmission / reception unit 4012 determines the received recognition result character data as character recognition. To the unit 402.

  The entry item content generation unit 4021 of the character recognition confirmation unit 402 generates and confirms the received recognition result character data and the item name of the entry item in association with each other, and displays the character data of the recognition result corresponding to the entry item. It is displayed in the column 73.

  Note that the processing subsequent to step S504 (S104 to S109) is the same as in the first embodiment, and a description thereof will be omitted.

  As described above, according to the seventh embodiment, character recognition is performed by an external character recognition system by configuring character recognition outside the tablet terminal 1, for example, with a character recognition system existing on the cloud service. The processing in the tablet terminal 1 can be realized more lightly.

  Although the embodiment of the present invention has been described, the above embodiment is presented as an example, and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The above-described embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and equivalents thereof.

  In the above embodiment, the tablet terminal 1 having the touch panel 3 in which the display function and the input function are integrated has been described as an example. However, in addition to this, for example, a notebook computer having a separate display function and input function, or an LCD panel A computer with a configuration in which a display device such as a keyboard and an input device such as a keyboard are prepared separately and connected externally, or an input device such as a keyboard, mouse, pointing device, etc., and only the display device is connected externally A computer having a configuration in which only the input device is externally connected may be used.

  In the above-described embodiment, each component is realized by a program installed in a memory of a tablet (computer). However, the program is stored in a computer-readable electronic medium: electronic media, and the program is stored in the electronic medium. The computer may realize the functions of the present invention by causing the computer to read the information. Examples of the electronic medium include recording media such as CD-ROM and DVD-ROM, flash memory, removable media, and the like. Further, the configuration may be realized by distributing and storing components in different computers connected via a network, and communicating between computers in which the components are functioning.

  In the above embodiment, an example in which the form image acquisition function to the character recognition and correction function, the entry function to the external system 8 and the like are accommodated in the tablet terminal 1 and the example in which the character recognition function is realized by the external character recognition system 81 will be described. However, the tablet terminal 1 may accommodate a form image acquisition function and realize other functions (image processing, image segmentation, character recognition) with the external character recognition system 81. Also, some functions, such as a correction function, may be realized by an external system (such as a cloud service).

  Further, only the functions of the camera unit 2, the touch panel 3, and the web browser (communication interface) may be mounted on the tablet terminal 1, and other functions may be realized by the external system 8 (cloud service or the like).

  A ... Form, 1 ... Tablet terminal, 2 ... Camera unit, 3 ... Touch panel, 5 ... Memory, 6 ... Communication interface (communication I / F), 7 ... Network, 8 ... External system, 9 ... Scanner, 10 ... Image acquisition , 11 ... Form image writing part, 12 ... Form image database (form image DB), 13 ... Storage, 20 ... Screen control part, 21 ... Form image reading part, 22 ... Screen generation part, 23 ... OCR target form reception , 24... OCR target entry item reception unit, 25... OCR target entry item area reception unit, 40... Character recognition unit, 41... Form definition database (form definition DB), 42. , 47 ... Recognition history database (recognition history DB), 43 ... Recognition history DB, 44 ... OCR engine, 45 ... Recognition control unit, 46 ... Correction unit, 50 Entry information update unit, 52 ... Entry information writing unit, 53 ... Entry information transmission unit, 51 ... Entry information database (entry information DB), 81 ... External character recognition system, 401 ... Character recognition request unit, 402 ... Character recognition confirmation , 811 ... Character recognition unit, 4011 ... Image cutout unit, 4012 ... Character recognition request transmission / reception unit, 4021 ... Entry item content generation unit.

Claims (11)

In the form reading device that reads characters from the form image obtained by optically reading the form,
A screen control unit for outputting a screen having a display field in which the image of the form and character data obtained as a result of character recognition from the image are displayed;
A character recognizing unit for recognizing the image portion of the designated area of the image of the form;
A recognition history storage unit in which the result of character recognition is stored as a recognition history;
Character data that matches the character data recognized by the character recognition unit and character data candidates with a recognition result having a similarity equal to or greater than a certain value are searched from the recognition history storage unit and displayed near the display field and the display field. A character reading device. The recognition control unit
Character data obtained by correcting the selected text data character, character data candidate, or character data by key input from the character data or character data candidates displayed in the display field or in the vicinity of the display field is determined as a result of character recognition. The character reading device according to claim 1, wherein the character reading device is stored in the recognition history storage unit. The recognition control unit
The form reading apparatus according to claim 1, wherein the character data recognized by the character recognition unit is displayed in the display field, and character data candidates of a recognition result having a high similarity are displayed in the vicinity of the display field. The recognition control unit
The form reading apparatus according to claim 1, wherein the character data read from the recognition history storage unit is displayed in the display field as a result of character recognition. The recognition control unit
Storing the recognition result character data and the identifier indicating that the operator has confirmed in the recognition history storage unit in association with each other;
The form reading apparatus according to claim 1, wherein when searching the recognition history storage unit, the form data is searched from character data to which the identifier is assigned. The recognition control unit
The recognition result character data and the item name to which the character data belongs are associated with each other and stored in the recognition history storage unit,
The form reading device according to claim 1, wherein character data is searched from the item names when searching the recognition history storage unit. The recognition control unit
Storing the recognition result character data and the item group to which the character data belongs in the recognition history storage unit in association with each other;
The form reading apparatus according to claim 1, wherein character data is searched from the item group when searching the recognition history storage unit. The recognition control unit
When a character that cannot be recognized by the character recognition unit is included, a character data candidate with a high similarity retrieved from the recognition history storage unit is recognized using other character data recognized from the same area. The form reading apparatus according to claim 1, wherein the form reading data is displayed in the display field as result character data. In a computer that reads characters from the image of the form obtained by optically reading the form,
The computer,
A screen control unit for outputting a screen having a display field in which the image of the form and character data obtained as a result of character recognition from the image are displayed;
A character recognizing unit for recognizing the image portion of the designated area of the image of the form;
A recognition history storage unit in which the result of character recognition is stored as a recognition history;
Character data that matches the character data recognized by the character recognition unit and character data candidates whose recognition result is a certain value or more are searched from the recognition history storage unit, and are displayed in the display field and the vicinity of the display field. A program that functions as a recognition control unit for display. A form reading system in which a terminal device for reading characters from an image of the form obtained by optically reading a form and a character recognition device are connected via a network,
The terminal device
A screen control unit for outputting a screen having a display field in which the image of the form and character data obtained as a result of character recognition from the image are displayed;
A character recognition requesting unit for requesting character recognition by transmitting an image portion of a designated area of the image of the form as an image file to the character recognition device;
A recognition history storage unit in which the result of character recognition is stored as a recognition history;
In response to a character recognition request, a recognition result character data candidate that matches or is similar to the recognition result character data received from the character recognition device is searched from the recognition history storage unit, and the display field and the display field A recognition control unit for displaying in the vicinity,
With
The character recognition device includes:
A form reading system including a character recognition unit that recognizes characters of an image file transmitted from the terminal device and transmits the recognition result character data to the terminal device. Connecting the terminal device, the character recognition device, and an external system via a network;
The terminal device
A character recognition confirmation unit that confirms the recognition result character data or recognition result character data candidates selected from among the display column and the display column displayed in the vicinity of the display column, and stores the recognition result character data candidate in the recognition history storage unit;
An entry information database for storing a result of character recognition confirmed among the recognition histories stored in the recognition history storage unit;
The form reading system according to claim 10, further comprising an entry information transmitting unit that transmits a result of character recognition in the entry information database to the external system.

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