JP2016173822A - Information processing apparatus, information processing system and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the generation of such a thumbnail image about a plurality of documents so that a user can easily discriminate the documents and also easily grasp contents of each document.SOLUTION: An information processing apparatus respectively calculates feature amounts about the image of each page of a document to be stored and a thumbnail image corresponding to another stored document (S13, S15), calculates similarity between respective images in the image of each page of the document to be stored and a thumbnail image corresponding to another stored document on the basis of the feature amounts (S16), selects an image having high similarity to another page in the document to be stored and also having low similarity to the thumbnail image corresponding to another stored document among images of each page of the document to be stored on the basis of the similarity according to a prescribed reference (S17 to S20), and creates a thumbnail image corresponding to the document to be stored on the basis of the selected image (S21).SELECTED DRAWING: Figure 3

Description

  The present invention relates to an information processing apparatus, an information processing system, and a program.

  Conventionally, in the field of information processing apparatuses and image forming apparatuses, a large number of documents are stored in a storage unit so that a user can arbitrarily select a document from among them and perform processing such as display and printing. Has been done. In addition, when accepting a document selection, in addition to displaying document attribute information such as the document name, storage date, and print settings, the thumbnail image obtained by reducing the image that appears when the document is displayed or printed is displayed. It has also been made easier to understand the contents of documents.

Here, when creating a thumbnail image, it is conceivable to create it simply based on the image of the first page of each document. However, such a simple creation method has a problem in that there are cases where a number of similar thumbnail images increase, making it difficult to identify a document. For example, there are many documents with a common cover format.
As a technique for coping with such a problem, for example, those described in Patent Documents 1 and 2 are known.

In Patent Document 1, a feature amount is calculated for image data of each page included in a document, and each feature amount is compared with a reference feature amount to generate a thumbnail image based on the image of the page having the highest similarity. It is described to do.
In Patent Document 2, when the thumbnail images of a plurality of documents are subjected to clustering processing, and as a result, there are groups of similar thumbnail images, the thumbnail images of each document in the group are currently used. It is described that the image is regenerated based on the image of the next page of the page.

However, the technique described in Patent Document 1 does not directly take into consideration that thumbnail images are similar in a plurality of documents, and sufficiently satisfies the demand for preventing the generation of similar thumbnail images. It was not done.
Further, the technique described in Patent Document 2 has a problem that the page used for generating the thumbnail image is determined according to the page order, and therefore does not necessarily represent the contents of each document.

  An object of the present invention is to solve such a problem and to generate a thumbnail image for a plurality of documents so that a user can easily distinguish between the documents and understand the contents of each document. .

  In order to achieve the above object, according to the present invention, in an information processing apparatus, storage means for storing documents, storage means for storing thumbnail images corresponding to each document stored by the storage means, and corresponding thumbnail images A feature amount calculating means for calculating a feature amount for each page image of one document to be created and a thumbnail image corresponding to a document other than the one document stored by the storing means; Based on the feature amount calculated by the feature amount calculation means, the similarity between the images in the image of each page of the one document and the thumbnail image corresponding to the document other than the one document is calculated. Based on the similarity calculated by the similarity calculation means and the similarity calculation means, the similarity between the image of each page of the one document and the other pages in the one document is high. In addition, a selection unit that selects an image with a low similarity between a corresponding thumbnail image and a thumbnail image corresponding to the document other than the one document according to a predetermined criterion, and the image corresponding to the one document based on the image selected by the selection unit. There is provided thumbnail creation means for creating a thumbnail image.

  According to the above configuration, it is possible to generate thumbnail images for a plurality of documents so that the user can easily distinguish between the documents and can easily understand the contents of each document.

It is a figure which shows the hardware constitutions of the information processing apparatus which is 1st Embodiment of this invention. It is a figure which shows the function structure of the information processing apparatus shown in FIG. 3 is a flowchart of processing executed when the CPU of the information processing apparatus illustrated in FIG. 1 detects a document accumulation instruction. It is a figure which shows the example of the execution result of a clustering process typically. It is a figure which shows the other example. 3 is a flowchart of processing executed when the CPU of the information processing apparatus illustrated in FIG. 1 detects an instruction to create a thumbnail image. It is a flowchart of the process corresponding to FIG. 3 in 2nd Embodiment. It is a figure which shows the example of the management data of the accumulated document. It is a flowchart of the process corresponding to FIG. 3 in 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment: FIGS. 1 to 5]
First, a first embodiment of the present invention will be described.
FIG. 1 is a diagram showing a hardware configuration of an information processing apparatus according to the first embodiment of the present invention.
As shown in FIG. 1, the information processing apparatus 10 includes a CPU 11, a ROM 12, a RAM 13, an HDD (hard disk drive) 14, a communication I / F (interface) 15, an operation unit 16, and a display unit 17. It is set as the structure connected by.

Then, the CPU 11 controls the entire information processing apparatus 10 by executing programs stored in the ROM 12 or the HDD 14 using the RAM 13 as a work area, thereby realizing various functions including those described later with reference to FIG. To do.
The ROM 12 and the HDD 14 are non-volatile storage media (storage means) and store various programs executed by the CPU 11 and various data described later. The HDD 14 can be used as a storage unit for storing documents.

  The communication I / F 15 is an interface for communicating with an external device via an arbitrary communication path such as a LAN (local area network), the Internet, or peer-to-peer communication. The storage means serving as the document storage destination may be provided in an external device that can communicate via the communication I / F 15.

The operation unit 16 is an operation means for receiving an operation from a user, and can be configured by a pointing device such as a keyboard and a mouse.
The display unit 17 is a presentation unit for presenting the operation state, setting content, message, and the like of the information processing apparatus 10 to the user, and includes a liquid crystal display and the like. The display unit 17 also displays a screen for accepting selection of a document to be processed using thumbnail images. An operation on the screen can be accepted by the operation unit 16.

  The operation unit 16 and the display unit 17 may be externally attached. Further, when the information processing apparatus 10 does not need to directly receive an operation from the user (the operation may be accepted by an external apparatus connected via the communication I / F 15 or information may be presented), the operation is performed. The part 16 and the display part 17 may not be provided.

The information processing apparatus 10 described above can be configured as a general-purpose computer as hardware. However, as indicated by a broken line in FIG. 1, a scanner engine 18 that is an image reading unit that reads an image of a document and acquires image data, and a printer engine 19 that is an image forming unit that forms an image on a sheet are provided. It can also be configured as an image processing apparatus such as a (digital multifunction peripheral).
In addition, one of the characteristic points in the information processing apparatus 10 described above is a function related to creation of thumbnail images corresponding to each document when the documents are stored. Hereinafter, this point will be described.

  Next, FIG. 2 shows a functional configuration of the information processing apparatus 10. FIG. 2 mainly shows functions related to the above-described document accumulation and thumbnail image creation. The functions of these units are realized by the CPU 11 executing a required program and controlling required hardware.

As illustrated in FIG. 2, the information processing apparatus 10 includes a document management unit 110, a document storage unit 120, and a document processing unit 130.
Among these, the document storage unit 120 has a function of a storage unit that stores data of a plurality of documents each including one or more pages. The function of the document storage unit 120 can be realized by the HDD 14, for example, but may be realized by a storage of an apparatus outside the information processing apparatus 10.
The document processing unit 130 has a function of executing a process instructed by the user on a document selected by the user from those stored in the document storage unit 120. For example, display, printing, transmission to the outside, editing, and deletion can be considered as this processing.

  The document management unit 110 has a function of accumulating documents in the document storage unit 120 and managing the accumulated documents. More specifically, the document storage unit 111, the document acquisition unit 112, the feature amount calculation unit 113, the clustering processing unit 114, the page selection unit 115, the thumbnail image creation unit 116, the thumbnail image storage unit 117, and the document selection reception unit 118. Is provided.

Among these, the document storage unit 111 has a function of a storage unit that stores and stores a document instructed to be stored by a user, another process, or an external device in the document storage unit 120.
The document acquisition unit 112 has a function of acquiring a document to be used for processing in the document processing unit 130 among documents stored in the document storage unit 120.

  The feature amount calculation unit 113 has a function of a feature amount calculation unit that calculates a feature amount of an image used for analysis when creating a thumbnail image for each page image or thumbnail image of the document. This feature amount represents, for example, image features such as color scheme, texture, edge distribution, composition, etc., in a numerical string. More specifically, it is possible to use any combination of shape context, signature, skeleton, SIFT (Scale-Invariant Feature Transform), CSS (Color Self-Similarity), etc., but is not limited thereto.

  The clustering processing unit 114 has a function of similarity calculation means for calculating the similarity between images based on the feature amount calculated by the feature amount calculation unit 113. More specifically, the clustering processing unit 114 performs a clustering process on the feature amount, and includes an image of each page of a document for which a thumbnail is to be created and a thumbnail image of an accumulated document to be compared. If there are a group of images similar to each other, they are extracted as a cluster. Of course, if there are a plurality of groups of similar images, a plurality of clusters are extracted. One image may constitute one cluster.

As an algorithm for this clustering process, unsupervised clustering or supervised clustering that constructs a classifier using an accumulated document as a learning sample can be used. More specifically, for example, random forest (L. Breiman, “Random Forests”,
Machine Learning, vol. 45, no. 1, pp. 5-32, Oct. 2001), k-means method, Self-Organizing Map, etc. can be used. I can't.

  Note that the clustering processing unit 114 calculates the similarity for each page image of the document for which a thumbnail is to be created, not the feature amount obtained for the image itself of each page, but the thumbnail created based on the image of each page. You may perform using the feature-value calculated | required about the image. This is because the comparison target is a thumbnail image of another document, and a document for which a thumbnail is to be created can be compared based on the same standard when compared using the thumbnail image. Also in the specific processing example described below, the feature amount obtained for the thumbnail image is used.

The page selection unit 115 has a function of a selection unit that selects a page image of a document in which a thumbnail is to be created based on a similarity calculation result by the clustering processing unit 114 and selects a thumbnail image.
The thumbnail image creation unit 116 has a function of thumbnail creation means for creating a thumbnail image based on an image of an arbitrary page in the document.

The thumbnail image storage unit 117 has a function of storing the thumbnail image created by the thumbnail image creation unit 116 for the page selected by the page selection unit 115 as the thumbnail image of the document in association with the original document data. . The storage destination may be the document storage unit 120 or other storage means.
The document selection accepting unit 118 has a function of accepting selection of a document to be processed from the user while displaying thumbnail images corresponding to each document saved by the thumbnail image saving unit 117 on the display.

Next, a thumbnail image creation process executed by the CPU 11 of the information processing apparatus 10 will be described. FIG. 3 is a flowchart of the processing.
When the CPU 11 detects that a user, another process, an external device, or the like has instructed the storage of the document, the CPU 11 starts the processing shown in the flowchart of FIG.
In the process of FIG. 3, the CPU 11 first stores the data of the accumulation target document in the document storage unit 120 (S11). This process corresponds to the function of the document storage unit 111.

Next, the CPU 11 creates a thumbnail image based on the image of each page of the accumulation target document (S12). This process corresponds to the function of the thumbnail image creation unit 116. The thumbnail image created here is for use in examining which page image to use.
Next, the CPU 11 calculates the feature amount of each thumbnail image created in step S12 and maps it to the feature space (S13). This process corresponds to the function of the feature amount calculation unit 113.

  Next, the CPU 11 selects, as a comparison document, a document that satisfies a predetermined condition from documents other than the accumulation target document stored in the document storage unit 120 (S14). When creating thumbnail images, all documents other than the storage target documents stored in the document storage unit 120 may be considered. However, if the number is too large, the processing load increases. It is to squeeze.

  Examples of the predetermined condition include, but are not limited to, a period of time after registration, a certain number of accesses, a number of accesses of a certain value or within a certain upper ratio, and documents of the same classification as the accumulation target document. It is preferable to set a condition for extracting a document in which a thumbnail image is displayed relatively frequently or a thumbnail image is displayed side by side with an accumulation target document. If the condition “all” is set, substantially the same processing can be performed as when no condition is set. These conditions can be arbitrarily set by the user or the administrator.

  Next, the CPU 11 calculates the feature amount of the thumbnail image corresponding to each contrast document selected in step S14 and maps it to the same feature space as in step S13 (S15). This process corresponds to the function of the feature amount calculation unit 113. In addition, the thumbnail image stored in the thumbnail image storage unit 117 may be used. It may be created in the past by the processing of FIG. 3, created by other processing, or not particularly reflecting the image of the document.

Next, the CPU 11 executes clustering processing for the feature values mapped in steps S13 and S15 (S16). This processing corresponds to the function of the similarity calculation unit that calculates the similarity between images in the clustering processing unit 114.
Thereafter, the CPU 11 pays attention to which cluster each page of the accumulation target document belongs to among the clustering results, and selects the cluster to which the most pages of the accumulation target document belong as the attention cluster (S17). When there are a plurality of clusters having the largest number, a cluster including a page with a smaller distance from the center of the cluster is set as a focused cluster. As the “distance” at this time, the Euclidean distance in the feature space can be used. The same applies to the criteria of “distance”, “near”, and “far” in the following description. The above noted cluster can be considered as a cluster in which pages having high similarity to other pages in the accumulation target document are gathered.

  If the contrast document (thumbnail image) does not belong to this cluster of interest (No in S18), the CPU 11 creates a thumbnail image of the page mapped to the position closest to the center of the cluster in the cluster of interest. The page to be used is selected (S19). This is because each page in the cluster does not have a page with a high similarity to the thumbnail image of the comparison document, so the most typical image in the cluster is made a thumbnail image without considering the comparison document any more. This is a selection to create a thumbnail image that makes it easy to grasp the contents of the document to be stored.

On the other hand, when the comparison document (thumbnail image) belongs to the cluster of interest (Yes in S18), the CPU 11 uses the page mapped to the position farthest from the comparison document in the cluster of attention as the page used to create the thumbnail image. Select (S20). This is because, even in a cluster, there are pages with high similarity to the thumbnail image of the comparison document, so select a page with low similarity to the thumbnail image of the comparison document in the cluster and make it as easy as possible to distinguish it from other documents. Is to create.
The processing in steps S17 to S20 described above is performed by using an image having a high similarity to another page in the accumulation target document and a low similarity between the corresponding thumbnail image and a document other than the accumulation target document. According to the function of the page selection unit 115.

In any case, the CPU 11 next stores the thumbnail image created based on the image of the page selected in step S19 or S20 as the thumbnail image of the document to be accumulated (S21), and ends the process. This process corresponds to the function of the thumbnail image storage unit 117.
With the above processing, the information processing apparatus 10 automatically creates a thumbnail image that clearly represents the characteristics of the document to be stored and that can be easily distinguished from other stored thumbnail images. Can be saved. In the above processing, the CPU 11 functions as a first control unit.

Here, the processing of steps S17 to S20 will be further described with reference to FIGS. 4A and 4B.
4A and 4B schematically show the execution results of the clustering process in step S16. In these figures, the black figure indicates the position where the feature amount of the thumbnail image of each page of the document to be stored is mapped, and the white figure indicates the position where the thumbnail image of the comparison document is mapped. In any example, the accumulation target document is four pages and the number of comparison documents is two. In addition, the notation of the feature space is schematic and the actual configuration is not limited to two dimensions.

4A and 4B, an ellipse and a rounded rectangle indicate clusters extracted by the clustering process, respectively, and an ellipse indicates a target cluster selected in step S17.
In both examples of FIGS. 4A and 4B, among the pages of the document to be stored, three pages belong to the same cluster, and the other page belongs to another cluster. Therefore, the cluster to which the maximum three pages belong is the attention cluster.

In the example of FIG. 4A, since the thumbnail image of the comparison document does not belong to the cluster of interest, the page mapped to the position closest to the center of the cluster is set as the page used for generating the thumbnail image.
On the other hand, in the example of FIG. 4B, since the thumbnail image of the comparison document belongs to the target cluster, the page mapped to the position farthest from the comparison document in the target cluster is selected as the page used for creating the thumbnail image. .

  By the way, the timing at which the information processing apparatus 10 creates a thumbnail image is not limited to the timing at which a document is newly accumulated. A thumbnail image can be created by a process similar to that shown in FIG. 3 in response to a creation instruction designating any of the already accumulated documents at an arbitrary timing.

FIG. 5 shows a flowchart of processing executed by the CPU 11 in this case. The process of FIG. 5 is common to the process of FIG. 3 in many parts, and the same step numbers are used for the common parts.
When the CPU 11 detects that an instruction to create a thumbnail image has been given by the user, another process, or an external device, the CPU 11 starts the process shown in the flowchart of FIG.

In the process of FIG. 5, a thumbnail image is created based on the image of each page of the creation target document designated as the thumbnail image creation target (S12 ′). This process is the same as step S12 in FIG. 3 except that the target document is different.
Thereafter, the CPU 11 can generate and store a thumbnail image having the same concept as in FIG. 3 through the processing of steps S13 to S21 ′. Note that steps marked with “′” are different from the corresponding steps in FIG. 3 in that the object of processing is a document to be created. The storage in step S21 ′ may be performed by overwriting a thumbnail image created in the past. In the above processing, the CPU 11 functions as a second control unit.

  Even if a thumbnail image is created by the processing of FIG. 3, it may be difficult to distinguish it from the thumbnail images of other documents as the number of thumbnail images of other documents increases thereafter. In this case, if a thumbnail image is created again, it may be possible to create a thumbnail image that is easier to distinguish based on an image of another page. Note that the balance between how typical a page is in a document and how easily it can be distinguished from thumbnail images of other documents depends on the clustering process and the selection of pages based on the processing results. When automatically taken into account.

[Second Embodiment: FIGS. 6 and 7]
Next explained is the second embodiment of the invention.
In the second embodiment, when another document having the same content as the document to be created as a thumbnail image has already been accumulated, the thumbnail image of the other document is also used as the thumbnail image of the document to be created. This is different from the first embodiment. Since other points are common to the above-described first embodiment, only matters relating to this difference will be described. Moreover, about the structure which is common or corresponds to 1st Embodiment, the same code | symbol as what was used in 1st Embodiment is used.

FIG. 6 shows a flowchart of processing corresponding to FIG. 3 in the second embodiment.
In this process, a determination is made between steps S11 and S12 in FIG. 3 as to whether or not another document having the same content as the document to be accumulated is accumulated in step SA, and if this is Yes, the process proceeds to step SB. It is what I did. In step SB, the CPU 11 adopts and stores the thumbnail image corresponding to the other document found in step SA as the thumbnail image of the accumulation target document, and ends the process. If No in step SA, the process proceeds to step S12 and subsequent steps in FIG.
Here, the determination in step SA can be performed with reference to management data for managing documents stored in the document storage unit 120 managed by the document management unit 110, for example.

FIG. 7 shows an example of this management data.
This management data is a collection of bibliographic items related to documents stored in the document storage unit 120. For example, information such as a file name, a document registration (accumulation) date, a document last update date, a file size, a document page number, and the like are included.
Among these, for example, documents having the same size as the last update date and time are considered to be documents having the same content. Alternatively, if it cannot be determined by this alone due to the nature of the document, matching may be further performed on the image of each page to confirm the identity. Of course, the determination may be based on other criteria.

In this way, when there are documents with the same content, it is preferable to use the same thumbnail image so that the user can recognize it. This leads to a reduction in the processing load for creating thumbnail images when a plurality of documents having the same contents are accumulated.
Needless to say, the process shown in FIG. 5 can be modified in the same manner as in FIG. Since the process of FIG. 5 does not include step S11, step SA may be executed immediately after the start of the process.

[Third Embodiment: FIG. 8]
Next explained is the third embodiment of the invention.
The third embodiment is different from the first embodiment in that the image of the first page of the document is preferentially used for thumbnail image creation. Since other points are common to the above-described first embodiment, only matters relating to this difference will be described. Moreover, about the structure which is common or corresponds to 1st Embodiment, the same code | symbol as what was used in 1st Embodiment is used.

FIG. 8 shows a flowchart of processing corresponding to FIG. 3 in the third embodiment.
When the CPU 11 detects that a user, another process, an external device, or the like has instructed the storage of the document, the CPU 11 starts the processing shown in the flowchart of FIG.
In the process of FIG. 8, the CPU 11 first stores the data of the accumulation target document in the document storage unit 120 as in step S11 of FIG. 3 (S31).

Next, the CPU 11 creates a thumbnail image based on the image of the first page of the accumulation target document (S32). This process is the same as step S12 in FIG. 3 except that only the image of the first page is used.
Next, the CPU 11 calculates the feature amount of the thumbnail image created in step S32 and maps it to the feature space (S33). This process is the same as step S13 in FIG.

  Next, the CPU 11 selects, as a comparison document, a document that satisfies a predetermined condition from documents other than the accumulation target document stored in the document storage unit 120 (S34). Further, the feature amount of the thumbnail image corresponding to each contrast document selected in step S34 is calculated and mapped to the same feature space as in step 33 (S35). These processes are the same as steps S14 and S15 in FIG.

  Thereafter, the CPU 11 determines whether or not the distance (Euclidean distance) in the feature space between the thumbnail image created in step S32 and the thumbnail image of the closest comparison document is equal to or less than a predetermined value (S36). This determination is to determine whether or not a thumbnail image having a similarity equal to or higher than a predetermined reference with the thumbnail image created in step S32 has already been used as the thumbnail image of the comparison document.

  If “No” in step S36, it is understood that a thumbnail image having a high similarity to the thumbnail image generated based on the image of the first page of the accumulation target document in step S32 is not used. Accordingly, since it is considered that the accumulation target document can be easily distinguished from other documents by the thumbnail image created in step S32, the CPU 11 stores the thumbnail image created in step S32 as the thumbnail image of the accumulation target document ( S37), the process is terminated. This process corresponds to step S21 in FIG.

On the other hand, if Yes in step S36, it can be seen that another thumbnail image having a high similarity to the thumbnail image generated based on the image of the first page of the accumulation target document is used in the document. Therefore, the CPU 11 executes the processing from step S12 onward in FIG. 3, and based on the same criteria as in the first embodiment, the pages other than the first page are candidates, and the thumbnail image of the accumulation target document based on the image of any page. Is determined (S38). As a result, the first page may be selected.
In the above processing, the CPU 11 functions as third control means.

According to the above processing, it is possible to generate a thumbnail image that allows the user to easily distinguish the document while preferentially using the image of the first page of the document for thumbnail image creation. The first page is often a page that clearly shows the contents of the document, such as a title, so if the similarity to other thumbnail images is low, the user can use the first page preferentially. Can generate thumbnail images for easy understanding of the contents of each document.
Note that the determination in step S36 is performed on the feature values mapped in steps S33 and S35, and whether or not the thumbnail image of the comparison document belongs to the same cluster as the image of the first page of the accumulation target document is used as a reference. It is possible to do it. In this case, if it belongs, there is a thumbnail image with a high similarity, and the process proceeds to step S38. If not, the process proceeds to step S37 without a thumbnail image with a high similarity.

  This is the end of the description of the embodiment. In the present invention, the specific configuration of the apparatus, the specific processing procedure, the data configuration, the algorithm used for the processing, the determination criteria, and the like are the same as those described in the exemplary embodiment. It is not limited.

For example, the process for calculating the similarity is not limited to the clustering process, and may be calculated by another method.
In addition, the functions of the information processing apparatus 10 are provided in a distributed manner in a plurality of apparatuses, and it is not impeded that these apparatuses cooperate to function as an information processing system having the same functions as the information processing apparatus 10. Further, the information processing apparatus 10 may further include an arbitrary function other than that illustrated in FIG.

The embodiment of the program of the present invention is a program for causing a computer to control required hardware to realize the functions of the information processing apparatus 10 in the above-described embodiment.
Such a program may be stored in a ROM or other nonvolatile storage medium (flash memory, EEPROM, etc.) provided in the computer from the beginning. However, it can also be provided by being recorded on an arbitrary nonvolatile recording medium such as a memory card, CD, DVD, or Blu-ray disc. Each procedure described above can be executed by installing the program recorded in the recording medium in a computer and executing the program.

Furthermore, it is also possible to download from an external device that is connected to a network and includes a recording medium that records the program, or an external device that stores the program in a storage unit, and install and execute the program on a computer.
In addition, it is needless to say that the configurations of the embodiments and modifications described above can be arbitrarily combined and implemented as long as they do not contradict each other.

10: Information processing device, 11: CPU, 12: ROM, 13: RAM, 14: HDD, 15: Communication I / F, 16: Operation unit, 17: Display unit, 18: Scanner engine, 19: Printer engine, 20 : System bus 110: Document management unit 111: Document storage unit 112: Document acquisition unit 113: Feature amount calculation unit 114: Clustering processing unit 115: Page selection unit 116: Thumbnail image creation unit 117: Thumbnail image storage unit 118: Document selection receiving unit 120: Document storage unit 130: Document processing unit

JP 2009-251587 A JP 2012-8644 A

Claims (12)

Storage means for storing documents;
Storage means for storing thumbnail images corresponding to each document stored by the storage means;
Features for calculating feature amounts for each page image of one document for which a corresponding thumbnail image is to be created, and for thumbnail images corresponding to a document other than the one document stored by the storage unit A quantity calculating means;
Similarity for calculating similarity between images in the image of each page of the one document and the thumbnail image corresponding to the document other than the one document based on the feature amount calculated by the feature amount calculation unit Degree calculation means;
Based on the similarity calculated by the similarity calculation means, among the images of each page of the one document, the similarity with other pages in the one document is high, and a document other than the one document Selecting means for selecting an image with a low similarity to the corresponding thumbnail image according to a predetermined criterion;
An information processing apparatus comprising: a thumbnail creation unit that creates a thumbnail image corresponding to the one document based on the image selected by the selection unit. The information processing apparatus according to claim 1,
The similarity calculation means is means for performing a clustering process on the image of each page of the one document and the feature amount of a thumbnail image corresponding to a document other than the one document,
The selection means includes, as the predetermined criterion, a criterion for selecting one of images belonging to a cluster into which a maximum number of images are classified among images of each page of the one document. Information processing device. An information processing apparatus according to claim 2,
If the thumbnail image corresponding to a document other than the one document does not belong to the cluster in which the maximum number of images are classified as the predetermined reference, the selection unit is closest to the center in the cluster. An information processing apparatus having a criterion of selecting an image having a feature amount. An information processing apparatus according to claim 2 or 3,
If the thumbnail image corresponding to a document other than the one document belongs to the cluster in which the maximum number of images are further classified as the predetermined reference, the selection unit includes the one document in the cluster. An information processing apparatus comprising a criterion of selecting an image having a feature amount furthest from a thumbnail image corresponding to a document other than An information processing apparatus according to any one of claims 1 to 4,
The information processing apparatus, wherein the feature amount calculation means uses a feature amount of a thumbnail image created based on an image of each page as a feature amount of an image of each page of the one document. An information processing apparatus according to any one of claims 1 to 5,
The information processing apparatus according to claim 1, wherein the feature amount calculating unit includes a unit that sets a range of documents corresponding to a range of documents among the documents stored in the storage unit. An information processing apparatus according to any one of claims 1 to 6,
A first control unit configured to create a thumbnail image corresponding to the document by the feature amount calculation unit, the similarity calculation unit, the selection unit, and the thumbnail generation unit when the document is to be newly stored in the storage unit; An information processing apparatus comprising: An information processing apparatus according to any one of claims 1 to 7,
At any timing, a thumbnail image corresponding to the document is created by the feature amount calculation unit, the similarity calculation unit, the selection unit, and the thumbnail creation unit for any of the documents already stored in the storage unit An information processing apparatus comprising: a second control unit that performs: An information processing apparatus according to any one of claims 1 to 8,
In the case where another document having the same content as the one document for which the corresponding thumbnail image is to be created is stored in the storage unit, the thumbnail creating unit stores the thumbnail image corresponding to the other document, An information processing apparatus that is employed as a thumbnail image corresponding to the one document. An information processing apparatus according to any one of claims 1 to 9,
The feature amount calculation means calculates the feature amount for each of the first page image of the one document and the thumbnail image corresponding to the document other than the one document stored by the storage means,
Based on the feature amount calculated by the feature amount calculation means, a similarity between the image of the first page of the one document and a thumbnail image corresponding to each document other than the one document is obtained, and the one document A thumbnail image corresponding to the one document is generated based on the image of the first page of the one document when there is no thumbnail image whose similarity with the image of the first page is equal to or greater than a predetermined reference,
Third control means for causing the selection means to select an image as a candidate for another page of the one document when there is a thumbnail image having a similarity with the image of the first page of the one document equal to or greater than the predetermined reference. An information processing apparatus comprising: Storage means for storing documents;
Storage means for storing thumbnail images corresponding to each document stored by the storage means;
Features for calculating feature amounts for each page image of one document for which a corresponding thumbnail image is to be created, and for thumbnail images corresponding to a document other than the one document stored by the storage unit A quantity calculating means;
Similarity for calculating similarity between images in the image of each page of the one document and the thumbnail image corresponding to the document other than the one document based on the feature amount calculated by the feature amount calculation unit Degree calculation means;
Based on the similarity calculated by the similarity calculation means, among the images of each page of the one document, the similarity with other pages in the one document is high, and a document other than the one document Selecting means for selecting an image with a low similarity to the corresponding thumbnail image according to a predetermined criterion;
An information processing system comprising: a thumbnail creation unit that creates a thumbnail image corresponding to the one document based on the image selected by the selection unit. Computer
Storage means for storing documents;
Storage means for storing thumbnail images corresponding to each document stored by the storage means;
Features for calculating feature amounts for each page image of one document for which a corresponding thumbnail image is to be created, and for thumbnail images corresponding to a document other than the one document stored by the storage unit A quantity calculating means;
Similarity for calculating similarity between images in the image of each page of the one document and the thumbnail image corresponding to the document other than the one document based on the feature amount calculated by the feature amount calculation unit Degree calculation means;
Based on the similarity calculated by the similarity calculation means, among the images of each page of the one document, the similarity with other pages in the one document is high, and a document other than the one document Selecting means for selecting an image with a low similarity to the corresponding thumbnail image according to a predetermined criterion;
A program for functioning as thumbnail creation means for creating a thumbnail image corresponding to the one document based on the image selected by the selection means.

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