CN112052857A - Method and related device for detecting target field in bill image - Google Patents
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/148—Segmentation of character regions
- G06V30/153—Segmentation of character regions using recognition of characters or words
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Abstract
The application provides a method and a related device for detecting a target field in a bill image, wherein the method comprises the following steps: determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation; determining position information of a preset target field from a target template file to obtain target position information; and calculating the position information of the target field on the bill image to be processed according to a preset mapping relation. The method and the device realize that only the target field is detected from the bill image.
Description
Technical Field
The present application relates to the field of image processing, and in particular, to a method and a related apparatus for detecting a target field in a ticket image.
Background
With the rise of artificial intelligence, Optical Character Recognition (OCR) is applied to Recognition of bill images in banking business more and more widely.
Since workers often need only information about a few specific fields (called target fields) in the ticket image when processing the business, there is no concern about non-target fields. Therefore, in order to improve efficiency, it is only necessary to detect the target field from the bill image and identify the target field.
At present, only the detection of all fields of the ticket from the ticket image can be realized, and the detection of only the target field cannot be realized. Therefore, detecting only the target field from the ticket image is a problem to be solved by .
Disclosure of Invention
The application provides a method and a related device for detecting a target field in a bill image, and aims to provide a scheme for detecting only the target field from the bill image.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a method for detecting a target field in a bill image, which comprises the following steps:
determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation;
determining position information of a preset target field from the target template file to obtain target position information;
and calculating the position information of the target field on the bill image to be processed according to the preset mapping relation.
Optionally, the determining, from a preset module file library, a template file corresponding to the type of the to-be-processed ticket image to obtain a target template file includes:
taking each template file in the template file library as a template file to be matched respectively;
for each template file to be matched, executing a matching process: extracting preset target features from preset position areas of the template file to be matched and the bill image to be processed respectively; calculating the matching degree between the target characteristics respectively corresponding to the template file to be matched and the bill image to be processed;
and taking the template file with the maximum matching degree as the target template file.
Optionally, the calculating, according to the preset mapping relationship, the position information of the target field on the to-be-processed bill image includes:
and calculating the position information of the target position information mapped on the bill image to be processed according to the mapping relation to obtain the position information of the target field on the bill image to be processed.
Optionally, before determining a template file corresponding to the type of the to-be-processed document image from the preset module file library to obtain the target template file, the method further includes:
and preprocessing the bill image to be processed.
The application also provides a device for detecting the target field in the bill image, which comprises:
the first determining module is used for determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation;
the second determining module is used for determining the position information of a preset target field from the target template file to obtain target position information;
and the calculation module is used for calculating the position information of the target field on the bill image to be processed according to the preset mapping relation.
Optionally, the first determining module is configured to determine, from a preset module file library, a template file corresponding to the type of the to-be-processed document image to obtain a target template file, and includes:
the first determining module is specifically configured to take each template file in the template file library as a template file to be matched respectively; for each template file to be matched, executing a matching process: extracting preset target features from preset position areas of the template file to be matched and the bill image to be processed respectively; calculating the matching degree between the target characteristics respectively corresponding to the template file to be matched and the bill image to be processed; and taking the template file with the maximum matching degree as the target template file.
Optionally, the calculating module is configured to calculate, according to the preset mapping relationship, position information of the target field on the to-be-processed ticket image, and includes:
the calculation module is specifically configured to calculate, according to the mapping relationship, position information of the target position information mapped on the to-be-processed bill image, and obtain position information of the target field on the to-be-processed bill image.
Optionally, the method further includes:
and the preprocessing module is used for preprocessing the bill image to be processed before the first determining module determines the template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file.
The application also provides a storage medium, which comprises a stored program, wherein the program executes any one of the detection methods of the target field in the bill image.
The application also provides a device, which comprises at least one processor, at least one memory connected with the processor, and a bus; the processor and the memory complete mutual communication through the bus; the processor is used for calling the program instructions in the memory to execute any one of the detection methods for the target field in the bill image.
According to the detection method and the related device for the target field in the bill image, the template file corresponding to the type of the bill image to be processed is determined from the preset module file library, and the target template file is obtained;
because the template file library comprises: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the bill image of the type and the position information of each field in the template file respectively; therefore, the position information of the target field can be determined from the target template file, and the target position information can be obtained. And the position information of any field on the bill image of the type and the position information of the field on the corresponding model document meet a preset mapping relation, so that the position information of the target field on the bill image to be processed can be calculated according to the preset mapping relation, and therefore, the detection of the target field in the bill image to be processed is only realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart of a method for detecting a target field in a document image according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a process of determining a template file corresponding to a type of a to-be-processed document image from a preset template file library, which is disclosed in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for detecting a target field in a bill image according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an apparatus disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a method for detecting a target field in a document image according to an embodiment of the present application, and the method may include the following steps:
s101, determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file.
In this embodiment, the template file library is established in advance, wherein the process of establishing the template file library may include: acquiring various types of image bills in advance, and respectively establishing corresponding template files for each type of image bills. The method for creating the template file for each type of image bill is the same, and for convenience of description, any type of bill image is taken as an example for description.
Because the fields in the bill images and the position information of each field in the bill images are consistent, establishing the model document corresponding to the bill images comprises the following steps: each field in the bill image and the position information of each field in the template file respectively, and the position information of any field on the bill image and the position information of the field on the corresponding template file meet the preset mapping relation.
For example, for any field in the type of document image, the relative position of the field in the type of document image is consistent with the relative position of the field in the corresponding template file. Of course, in practice, besides the manner of consistent relative positions, the preset mapping correspondence may also include other contents, and the specific contents of the preset mapping relationship are not limited in this embodiment.
S102, determining the position information of a preset target field from the target template file to obtain the target position information.
In this embodiment, the target field is a field that needs to be detected in practice, and therefore, the specific content of the target field is not limited in this embodiment.
In the embodiment, the target template file comprises various fields in the bill image to be processed and the position information of the various fields in the target template file. Therefore, in this step, the target field may be identified from the fields included in the target template file, and the location information of the target field in the target template file may be obtained according to the location information corresponding to each field in the target template file. In the present embodiment, for convenience of description, the location information of the object field in the object template file is referred to as object location information.
S103, calculating the position information of the target field on the bill image to be processed according to the preset mapping relation.
In this embodiment, in the template file library, the fields in any type of ticket image and the corresponding template file are respectively between the location information in the type of ticket image and the corresponding template file, and thus the preset mapping relationship is satisfied. Therefore, in this step, according to the preset mapping relationship, the position information of the target position information mapped onto the to-be-processed bill image can be calculated, and the calculated position information is the position information of the target field on the to-be-processed bill image.
Optionally, in this embodiment, before the execution of S101, an operation of preprocessing a to-be-processed document image may be further performed, where the preprocessing may include: and detecting whether the direction of the bill image to be processed is a preset direction or not, and if not, correcting the direction of the bill image to be processed. Of course, in practice, the preprocessing operation may also include other contents, and the specific content of the preprocessing operation is not limited in this embodiment.
The embodiment has the following beneficial effects:
the beneficial effects are that:
because the template file library comprises: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the bill image of the type and the position information of each field in the template file respectively; therefore, the position information of the target field can be determined from the target template file, and the target position information can be obtained. And the position information of any field on the bill image of the type and the position information of the field on the corresponding model document meet a preset mapping relation, so that the position information of the target field on the bill image to be processed can be calculated according to the preset mapping relation, and therefore, the detection of the target field in the bill image to be processed is only realized.
The beneficial effects are that:
since the embodiment realizes the detection of only the target field in the bill image to be processed, namely, the non-target field in the bill image to be processed is not detected, the computing resource can be saved.
Fig. 2 is a process for determining a template file corresponding to a type of a to-be-processed document image from a preset module file library according to an embodiment of the present application, where the process may include the following steps:
s201, taking each template file in the template file library as a template file to be matched.
S202, for the template file to be matched, executing a matching process: extracting preset target characteristics from preset relative position areas of the template file to be matched and the bill image to be processed respectively; and calculating the matching degree between the target characteristics respectively corresponding to the template file to be matched and the bill image to be processed.
In this embodiment, the preset relative position area of the template file to be matched may be a preset area at four corners of the template file to be matched, and the preset relative position area of the ticket image to be processed may be a preset area at four corners of the ticket image to be processed.
In this embodiment, the target feature may be a text feature or an image feature, and of course, in practice, other features may also be used, and the specific content of the target feature is not limited in this embodiment.
The matching degree between each template file and the bill image to be processed in the template file library can be obtained through the steps.
And S203, taking the template file with the maximum matching degree as a target template file.
In the step, the template file with the maximum matching degree in the matching degree between each template file and the bill image to be processed is used as the target template file.
Fig. 3 is a device for detecting a target field in a document image according to an embodiment of the present application, and the device may include: a first determining module 301, a second determining module 302, and a calculating module 303, wherein,
a first determining module 301, configured to determine, from a preset module file library, a template file corresponding to the type of the to-be-processed ticket image, to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation;
a second determining module 302, configured to determine location information of a preset target field from the target template file to obtain target location information;
and the calculating module 303 is configured to calculate position information of the target field on the to-be-processed bill image according to the preset mapping relationship.
Optionally, the first determining module 301 is configured to determine, from a preset module file library, a template file corresponding to the type of the to-be-processed document image, to obtain a target template file, and includes:
the first determining module 301 is specifically configured to use each template file in the template file library as a template file to be matched; for each template file to be matched, executing a matching process: extracting preset target features from preset position areas of the template file to be matched and the bill image to be processed respectively; calculating the matching degree between the target characteristics respectively corresponding to the template file to be matched and the bill image to be processed; and taking the template file with the maximum matching degree as the target template file.
Optionally, the calculating module 303 is configured to calculate, according to the preset mapping relationship, position information of the target field on the to-be-processed bill image, and includes:
the calculating module 303 is specifically configured to calculate, according to the mapping relationship, position information of the target position information mapped on the to-be-processed bill image, to obtain position information of the target field on the to-be-processed bill image.
Optionally, the apparatus may further include:
the preprocessing module is configured to preprocess the to-be-processed document image before the first determining module 301 determines the template document corresponding to the type of the to-be-processed document image from a preset module document library to obtain a target template document.
The device for detecting the target field in the bill image provided by the embodiment can realize that only the target field is detected from the bill image.
The detection device for the target field in the bill image comprises a processor and a memory, wherein the first determining module 301, the second determining module 302, the calculating module 303 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be provided with one or more than one, and a detection method for only detecting the target field in the bill image is provided by adjusting the kernel parameters.
The embodiment of the invention provides a storage medium, wherein a program is stored on the storage medium, and the program realizes the detection method of the target field in the bill image when being executed by a processor.
The embodiment of the invention provides a processor, which is used for running a program, wherein the detection method of a target field in a bill image is executed when the program runs.
An embodiment of the present invention provides an apparatus, as shown in fig. 4, the apparatus includes at least one processor, and at least one memory and a bus connected to the processor; the processor and the memory complete mutual communication through a bus; the processor is used for calling the program instructions in the memory to execute the detection method of the target field in the bill image. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device:
determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation;
determining position information of a preset target field from the target template file to obtain target position information;
and calculating the position information of the target field on the bill image to be processed according to the preset mapping relation.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a device includes one or more processors (CPUs), memory, and a bus. The device may also include input/output interfaces, network interfaces, and the like.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip. The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Features described in the embodiments of the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same or similar portions among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for detecting a target field in a bill image is characterized by comprising the following steps:
determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation;
determining position information of a preset target field from the target template file to obtain target position information;
and calculating the position information of the target field on the bill image to be processed according to the preset mapping relation.
2. The method according to claim 1, wherein the determining a template file corresponding to the type of the to-be-processed ticket image from a preset module file library to obtain a target template file comprises:
taking each template file in the template file library as a template file to be matched respectively;
for each template file to be matched, executing a matching process: extracting preset target features from preset position areas of the template file to be matched and the bill image to be processed respectively; calculating the matching degree between the target characteristics respectively corresponding to the template file to be matched and the bill image to be processed;
and taking the template file with the maximum matching degree as the target template file.
3. The method according to claim 1, wherein the calculating the position information of the target field on the to-be-processed bill image according to the preset mapping relation comprises:
and calculating the position information of the target position information mapped on the bill image to be processed according to the mapping relation to obtain the position information of the target field on the bill image to be processed.
4. The method according to claim 1, before determining a template file corresponding to the type of the to-be-processed document image from a preset module file library to obtain a target template file, further comprising:
and preprocessing the bill image to be processed.
5. An apparatus for detecting a field of interest in a document image, comprising:
the first determining module is used for determining a template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file; the template file library includes: template files corresponding to the preset bill images of various types respectively; the template file corresponding to any type of bill image comprises: each field in the type bill image and the position information of each field in the template file respectively, and the position information of any field on the type bill image and the position information of the field on the corresponding template file meet the preset mapping relation;
the second determining module is used for determining the position information of a preset target field from the target template file to obtain target position information;
and the calculation module is used for calculating the position information of the target field on the bill image to be processed according to the preset mapping relation.
6. The apparatus according to claim 5, wherein the first determining module is configured to determine, from a preset module file library, a template file corresponding to the type of the to-be-processed document image to obtain a target template file, and includes:
the first determining module is specifically configured to take each template file in the template file library as a template file to be matched respectively; for each template file to be matched, executing a matching process: extracting preset target features from preset position areas of the template file to be matched and the bill image to be processed respectively; calculating the matching degree between the target characteristics respectively corresponding to the template file to be matched and the bill image to be processed; and taking the template file with the maximum matching degree as the target template file.
7. The apparatus according to claim 5, wherein the calculating module is configured to calculate the position information of the target field on the to-be-processed document image according to the preset mapping relationship, and includes:
the calculation module is specifically configured to calculate, according to the mapping relationship, position information of the target position information mapped on the to-be-processed bill image, and obtain position information of the target field on the to-be-processed bill image.
8. The apparatus of claim 5, further comprising:
and the preprocessing module is used for preprocessing the bill image to be processed before the first determining module determines the template file corresponding to the type of the bill image to be processed from a preset module file library to obtain a target template file.
9. A storage medium comprising a stored program, wherein the program executes the method for detecting a field of interest in a ticket image according to any one of claims 1 to 4.
10. An apparatus comprising at least one processor, and at least one memory, bus connected to the processor; the processor and the memory complete mutual communication through the bus; the processor is used for calling the program instructions in the memory to execute the detection method of the target field in the bill image according to any one of claims 1 to 4.
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| CN112669515B (en) * | 2020-12-28 | 2022-09-27 | 上海斑马来拉物流科技有限公司 | Bill image recognition method and device, electronic equipment and storage medium |
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