JP2005209169A - Image processor, image processing system and control program of image processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To output a difference print regarding new image data at all times irrespective of whether or not newly inputted image data is newer than stored image data. <P>SOLUTION: An image forming apparatus 30 is provided with an image difference comparison means 32-3 for comparing first image data stored by an image storage means 32-4 with the second newly inputted image data and determining presence/absence of difference data, and an image formation means 32-2 for forming an image based on the difference data when it is determined that there is the difference data. In the image forming apparatus 30, the first and second image data have attribute information at least including time information when the data are created, an attribute difference comparison means 32-5 for comparing time information included in first attribute information which the first image data has and second attribute information which the second image data has and determining which image data is new and an image formation means 30 forms an image using the image data judged to be new by the attribute difference comparison means 32-5 as the difference data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image processing apparatus, an image processing system, and an image processing apparatus control program for storing image data and forming an image based on the stored image data, and more particularly, stored image data. The present invention relates to an image processing apparatus, an image processing system, and a control program for an image processing apparatus that execute an image forming process based on difference data between the image data and newly input image data.

In general, product specifications and other documents are revised as product specifications change, and the files that store the hard copy should always be replaced with the latest documents in accordance with product usage changes. Is desirable.
For this reason, image processing apparatuses represented by conventional printers, copiers (copiers), multifunction devices, and the like have a partially changed page (hereinafter referred to as “difference”) when replacing documents as described above. In order to print only “page”), printing is executed after a page number to be actually printed is designated in advance as a part of the function of the printer driver. As a result, unnecessary (not updated) pages are not printed, and only the difference pages that are actually required for replacement can be printed.

However, in order for the user to specify the page number to be actually printed on the printer driver, it is necessary for the user to specify the page number after grasping all the revised pages of the document. It was difficult to specify only the page. For this reason, the user often prints the entire document and replaces it including the part that has not been updated.
Therefore, as a conventional image processing apparatus that solves such a problem, the old image data stored on the image processing apparatus side and the new image that is input to be newly printed are specified without specifying the print page of the printer driver. A technique has been proposed in which a difference page is obtained based on comparison with data and only this difference page is automatically printed (see, for example, Patent Document 1).
According to such a conventional image processing apparatus, since it is possible to print only the difference page, it is possible to reduce the printing time and the number of print sheets used.
JP 2001-341365 A (page 3-5, FIG. 1)

However, according to the conventional image processing apparatus as described above, the image data stored in the image processing apparatus is the old data, and the image data input to be newly printed is the new data. As a result, the printing process was performed.
For this reason, for example, when the user mistakenly tries to print a document whose version is older than the image data stored in the image processing apparatus, the image processing apparatus stores the image data of the old version of the document. Therefore, it recognizes that the image data is newer than the image data currently stored in the apparatus and executes printing based on the difference data.
As a result, if a new version should be printed for a part that is different from the old version, the old version is printed for a part that is different from the new version, and the difference page required for replacing the document is obtained. There was no problem.

Further, the image processing apparatus recognizes the newly input image data of the old version as the image data of the new version. Therefore, the image data of the old version is overwritten and stored in the new image data stored. Therefore, there has been a problem that the image data stored in the image processing apparatus cannot always be kept up-to-date.
In addition, since the latest image data is not stored, a difference from newly input print data becomes large, which causes a problem that the minimum print processing cannot be suppressed.

  The present invention has been made to solve the above-described problems, and by introducing the concept of temporal attributes for print data, newly input image data is more than stored image data. Regardless of whether the data is new or old, output results for new image data can be obtained, and new image data is always stored in the device, so that the difference from newly entered print data can be obtained. An object of the present invention is to provide an image processing apparatus, an image processing system, and a control program for the image processing apparatus capable of performing the minimum necessary print processing.

  In order to achieve the above object, an image processing apparatus of the present invention includes an image storage unit that stores first image data input from the outside in the past, and second image data and first image data that are newly input from the outside. And image difference comparison means for judging whether or not there is difference data, and outputs image data based on the difference data when the image difference comparison means judges that there is difference data. The first and second image data includes attribute information including at least time information when the data is created, and includes first attribute information included in the first image data and second image data. Comparing the time information included in the second attribute information, and having attribute difference comparison means for judging which image data is new, the difference between the image data judged to be new by the attribute difference comparison means It is constituted to output as over data.

If the image processing apparatus has such a configuration, the image data has attribute information including time information, and has attribute difference comparison means for comparing the time information of the image data. It is possible to determine whether the image data and the image data newly input from the outside are new or old.
Therefore, regardless of whether the newly input image data is newer or older than the stored image data, an image based on the difference data portion of the new image data is formed and Can be output.

  Therefore, conventionally, when a user mistakenly tries to print a document whose version is older than the image data stored in the image processing apparatus, the image processing apparatus uses the image of the document to be newly printed. The data is recognized as image data that is newer than the image data currently stored in the apparatus, and printing based on the difference data is executed. However, according to the present invention, such a situation can be solved. In addition, an image can be formed based on the difference data portion of the newer image data that was originally stored, and printing can be executed.

In general, when the software in the device is changed, a validity check test is performed to determine whether the changed program has cleared the software evaluation criteria set by the quality department, etc. Even in this case, the image forming apparatus of the present invention can be applied.
That is, the first image data is data in the software stable period (data that has cleared the software evaluation criteria), and an image is obtained based on difference data between the first image data and the second image data input after the software change. If formed, it is possible to print only the page where the difference from the data in the software stable period has occurred.
According to this, since it is not necessary for the person in charge of the evaluation to visually confirm the legitimacy of the image as in the prior art, it is possible to greatly reduce the labor of the validity confirmation work.

  In the image processing apparatus of the present invention, the image storage means replaces the first image data with the second image data when the image data determined to be new by the attribute difference comparison means is the second image data. It is configured to save.

If the image processing apparatus has such a configuration, the latest image data can always be stored in the image storage means.
For this reason, the old version of the image data that was previously input is recognized as the new version of the image data, and the old version of the image data is overwritten and saved on the new stored image data. However, according to the present invention, such a situation can be solved. If the newly input image data is an older version than the stored image data, the old image data is changed. It is not saved in the image saving means in place of the saved data. Therefore, since the latest image data is stored in the apparatus, the difference from newly input print data can be minimized, and the minimum necessary print processing can be achieved.

  The image processing apparatus of the present invention indicates that the newly input second image data is old image data when the image data determined to be new by the attribute difference comparison unit is the first image data. A warning information output means for outputting warning information is provided.

If the image processing apparatus has such a configuration, a warning is output by the warning information output means when the newly input image data is older than the image data that was originally stored. Therefore, the output warning can be displayed on a display or the like provided in the apparatus to notify the user.
Therefore, the user can recognize from the warning that the newly input image data is older than the image data stored in the apparatus.
If the image processing apparatus is connected to another information terminal device or the like via a network, the warning information output by the warning information output means can be displayed on a monitor or the like of the information terminal device. .

  The image processing system of the present invention is an image processing system having an information terminal device connected to the image processing device via a network, and the information terminal device generates first and / or second image data. An image data generation unit and a transmission unit that transmits the generated image data to the image forming apparatus are provided.

If the image processing system is configured as described above, an information terminal device such as a personal computer has a time management function for managing the current time. Therefore, the image data generation means is based on this time management. Image data to which time information is added can be generated.
For this reason, even if it is the image data transmitted from the information terminal device, it is possible to determine whether the image data stored in the image processing device is new or old.

  Further, the control program of the image processing apparatus of the present invention includes an image storage step for storing first image data input from outside in the past, and second image data and first image data newly input from outside. An image difference comparison step for determining whether or not there is difference data, and an image processing step for outputting image data based on the difference data when it is determined that there is difference data in the image difference comparison step. The first and second image data includes attribute information including at least time information when the data is generated, and includes first attribute information included in the first image data, An attribute difference comparison step that compares the time information included in the second attribute information of the two image data and determines which image data is new is further performed. Is performed for forming device, the image processing step is a program for outputting an image data determined to new attribute difference comparing step as the difference data.

If the control program of the image processing apparatus is such a program, the image data has attribute information including time information, and an attribute difference comparison step for comparing the time information of the image data is included. It is possible to determine whether the image data that has been input is new or old.
Therefore, regardless of whether the newly input image data is newer or older than the stored image data, an image based on the difference data portion of the new image data is formed and Can be output.

According to the present invention, since the image data has attribute information including time information and includes the attribute difference comparison means for comparing the time information between the image data, the image data stored in the apparatus is newly added. It is possible to determine whether the input image data is new or old, and the difference between the new image data regardless of whether the newly input image data is newer or older than the stored image data. An image based on the data portion can be formed and output.
In addition, in order to update the image data stored in the apparatus to new image data only when it is determined that the image data newly input to the image processing apparatus is newer than the stored image data. The stored data can always be the latest image data, and the difference from the newly input print data can be minimized, so that the minimum necessary print processing can be performed.

Embodiments of the present invention will be described below with reference to the drawings.
An image processing system according to an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a block diagram showing the overall configuration of an image processing system including an image processing apparatus according to an embodiment of the present invention.
The image processing apparatus according to the present embodiment is an image forming apparatus 30 including a network printer that is communicably connected to the information terminal apparatus 10 via the network 20.
The image processing system has a minimum configuration for explaining the present invention.

However, although the image processing apparatus shown in FIG. 1 shows a configuration of a network printer as a specific example, the image processing apparatus according to the present embodiment is not limited to a printer. For example, a copying machine (copier), a facsimile machine , An image forming apparatus such as a scanner and a digital composite apparatus (multifunction peripheral (MFP)), and an image processing terminal such as a personal computer (see information processing terminal 10 described later) for controlling the image forming apparatus.
Further, when the image processing apparatus of the present embodiment is a printer, the printer includes various printing methods such as an ink jet printer, a sublimation type thermal transfer printer, a dot impact printer, a laser printer, and a fusion type thermal transfer printer. Printers included.

The information terminal device 10 is configured by a general-purpose personal computer or the like, and includes an image data generation unit 11 and a printer driver (transmission means) 12, and constitutes a part of the image processing apparatus of the present embodiment. Yes. It should be noted that an apparatus that does not have an image forming function such as the information terminal apparatus 10 can be used alone as the image processing apparatus of the present invention. In this case, old and new image data or image difference data input from the outside Are input to an image forming apparatus such as a printer connected via a network.
In the information terminal device 10, it is possible to specify a print processing method to be executed by the image forming apparatus 30. That is, in the information terminal device 10, print processing (normal printing) based on the image data transmitted from the information terminal device 10 is executed, or the difference between the image data stored in the image forming device 30 and the transmitted image data. It is possible to specify whether the image forming apparatus is to execute a printing process based on data (differential print).
FIG. 2 is a print processing designation screen displayed on the monitor of the information terminal device in the image processing system according to the embodiment of the present invention.
In the designation screen shown in FIG. 2, whether or not to perform differential printing can be selected and designated by inverting the white circle mark of the check box to the black circle mark.

The image data generation unit 11 generates attribute information including the time information managed by the time management function, the name of the document to be printed, and print processing designation information, and the image to be transmitted to the image forming apparatus 30. Data (first image data, second image data) is generated, and attribute information is added to the image data.
The printer driver 12 includes driver software that controls the image forming apparatus 30, and transmits the image data generated by the image data generation unit 11 to the image forming apparatus 30 via the network 20.

As shown in FIG. 1, the image forming apparatus 30 includes a network interface (network I / F) 31, a control unit 32, a ROM 33, an engine interface (engine I / F) 34, an engine unit 35, Display means 36.
The network interface 31 is physically connected to the network 20 and is an interface that transmits and receives data to and from the information terminal device 10.

FIG. 3 is a block diagram showing the internal configuration of the control means of the image processing apparatus according to this embodiment.
As shown in FIG. 3, the control means 32 is a device that performs overall control of the functions of the image processing apparatus, and includes a CPU, a memory, and the like, and includes a data analysis unit 32-1, an image forming unit 32-2, and an image difference comparison. Section 32-3, image storage section 32-4, attribute difference comparison section 32-5, attribute storage section 32-6, and warning information output section 32-7.

The data analysis unit 32-1 analyzes image data received from the information terminal device 10 via the network 20 and the network interface 31. That is, by reading the print processing designation information from the attribute information added to the image data, it is possible to identify whether the designation of the print processing method is normal printing or differential printing.
Therefore, when the data analysis unit 32-1 recognizes that the print processing method is differential printing, the data analysis unit 32-1 outputs the received image data to the image difference comparison unit 32-3, but recognizes that the print processing method is normal printing. The received image data is output to the image forming unit 32-2.

The image forming unit 32-2 performs rasterization processing on the input image data, obtains image data that has been subjected to bitmap development, and outputs this to the engine unit 35 via the engine interface 34.
In addition, when the image forming unit 32-2 determines that there is difference data by an image difference comparing unit 32-3 described later, the image forming unit 32-2 converts the image data determined to be new by the attribute difference comparing unit 32-5 to the difference data. Then, the difference data is rasterized to obtain bitmap-developed image data.

The image difference comparison unit 32-3 is input to the image forming apparatus 30 in the past and previously stored in the image storage unit 31, and the second image data newly input to the image forming apparatus 20 Are compared to determine whether there is difference data.
When the image difference comparison unit 32-3 determines that there is difference data, the image difference comparison unit 32-5 compares the time information included in the attribute information between the first image data and the second image data. To determine whether the image data is new or old. As a result, the image data determined to be old image data is set as comparison source data, and the other image data determined to be new image data is set as comparison destination data.
Furthermore, the image difference comparison unit 32-3 stores the latest data in the image data stored in the image storage unit 32-4. Therefore, after the difference page print processing, the image difference comparison unit 32-3 sets the comparison destination data as new comparison source data. As described above, the image data is stored in place of the image data stored in the image storage unit 32-4.

The image storage unit 32-4 stores and stores the image data input from the information terminal device 10 through the network 20 in the past as comparison source data.
The image storage unit 32-4 stores the latest image data as new comparison source data and stores the image data determined to be new by the attribute difference comparison unit 32-5 described later.

The attribute difference comparison unit 32-5 includes the attribute information (first attribute information) of the first image data stored as the comparison source data in the image storage unit 32-4 and the newly input second image data. The time information included in the attribute information (second attribute information) it has is compared to determine which image data is newer.
Further, the attribute difference comparison unit 32-5 outputs the determination result to the image difference comparison unit 32-3 and causes the attribute storage unit 32-6 to store the attribute information of the image data determined to be new. That is, since the image data determined to be new by the attribute difference comparison unit 32-5 is stored in the image storage unit 32-4, corresponding to the image data stored in the image storage unit 32-4, The attribute information added to the image data is stored in the attribute storage unit 32-6.
Furthermore, when the image data determined to be new is the comparison source data stored in advance in the image storage unit 32-4, the attribute difference comparison unit 32-5 uses this information as the warning information output unit 32- 7 is notified.

The attribute storage unit 32-6 stores and stores the attribute information of the image data stored in the image storage unit 32-4 as comparison source data.
That is, when storing the content of the comparison source data stored in the image storage unit 32-4 in place of the content of the comparison destination data, the attribute information of the comparison destination data is stored accordingly.

The warning information output unit 32-7 indicates that the newly input comparison destination data is the old image data when the image data determined to be new by the attribute difference comparison unit 32-5 is the comparison source data. The warning information is output to the engine unit 35 or the display means 36. Therefore, the user can check the warning information by the printing paper discharged from the engine unit 35 or the warning screen displayed on the display means 36.
Also, the warning information output by the warning information output unit 32-7 can be transmitted to the information terminal device 10 side via the network 20 and displayed on the monitor unit of the information terminal device 10.
4A is a warning information display screen displayed on the monitor of the information terminal device in the image processing system according to the present invention, and FIG. 4B is an image forming apparatus in the image forming system according to the present invention. This is a warning information recording sheet discharged from the engine section of the.

The ROM 33 is a read-only memory and stores in advance programs necessary for the image processing apparatus to perform various functions.
Therefore, the control means 32 fulfills various control functions based on the program stored in the ROM 33.

The engine interface 34 outputs the image information formed by the image forming unit 32-2 of the control unit 32 or the warning information output by the warning information output unit 32-7 to the engine unit 35, and executes the printing process. Let
The engine unit 35 prints image information and warning information input through the engine interface 34.

  The display means 36 includes a liquid crystal display unit provided on the operation panel, and displays various setting states and messages to the user. Therefore, when warning information is received from the warning information output unit 32-7 of the control means 32, the warning information is displayed on the screen.

Next, the operation of the image processing apparatus according to the present embodiment will be described with reference to FIG.
FIG. 5 is a flowchart showing the operation of the image processing apparatus according to the embodiment of the present invention.
First, the image forming apparatus 30 receives the second image data transmitted from the information terminal apparatus 10 and input via the network interface 31 (step S501).
Next, the second image data received in step S501 is sent to the data analysis unit 32-1 in the control unit 32, and attribute information and the like of the image data are analyzed by the data analysis unit 32-1 (step S502). .

Next, the data analysis unit 32-1 determines whether or not the print processing request designated by the print processing designation information included in the attribute information is the differential print execution mode (step S503).
If the result of determination in step S503 is that the execution mode is not differential printing, normal printing according to another printing mode is performed (step S504 (image forming step)), and the process is terminated.
On the other hand, if the result of determination in step S503 is that the execution mode is differential printing, the attribute difference comparison unit 32-5 stores the attribute information of the input second image data and the image storage unit 32-4. The attribute information of the first image data that has been made is compared (step S505 (attribute difference comparison step)).

Based on the comparison result of step S505, the image difference comparison unit 32-3 determines whether the stored first image data is image data (old image data) older than the input second image data. Is determined (step S506).
Next, if the result of determination in step S506 is that the stored first image data is older, the stored first image data is set as comparison source data (step S507). On the other hand, if the stored first image data is newer image data, the newly input second image data (received image data) is set as new comparison source data (step S508).

After setting the comparison source or comparison destination data in step S507 or step S508, the image difference comparison unit 32-3 compares the comparison source data with the comparison destination data (step S509), and there is difference data. (Step S510 (image difference comparison step)).
As a result of the determination in step S510, if there is difference data, image formation based on the difference data is performed by the image forming unit 32-2, and the engine unit 35 executes difference page printing processing (step S511 (image forming step)). . Thereafter, the image data stored in the image storage unit 32-4 is updated to new image data and stored (step S512 (image storage step)).

On the other hand, if there is no difference as a result of the determination in step S510, or if the image data is updated in step S512, it is determined whether there is a remaining page of other image data to be compared ( Step S513).
In step S513, if there is no remaining page, the process ends. If there is a remaining page, the process returns to step S509 to repeat the subsequent processes.

As described above, according to the image processing apparatus according to the present embodiment, the image data has the attribute information including the time information, and the attribute difference comparison unit 32-5 that compares the time information of the image data is provided. Thus, it is possible to determine whether the image data stored in the apparatus is new or old.
Therefore, regardless of whether the newly input image data is newer or older than the stored image data, an image based on the difference data portion of the new image data is formed and Can be output.

  Therefore, conventionally, when a user mistakenly tries to print a document whose version is older than the image data stored in the image storage unit, the image processing apparatus uses the image data of the document to be newly printed. Has been executed based on the difference data by recognizing that the image data is newer than the image data currently stored in the image storage unit. However, according to the present invention, such a situation can be solved. In addition, an image can be formed based on the difference data portion of the newer image data that was originally stored, and printing can be executed.

In general, when the software in the device is changed, a validity check test is performed to determine whether the changed program has cleared the software evaluation criteria set by the quality department, etc. Even in this case, the image processing apparatus of the present invention can be applied.
That is, the first image data is data in the software stable period (data that has cleared the software evaluation criteria), and an image is obtained based on difference data between the first image data and the second image data input after the software change. If formed, it is possible to print only the page where the difference from the data in the software stable period has occurred.
According to this, since it is not necessary for the person in charge of the evaluation to visually confirm the legitimacy of the image as in the prior art, it is possible to greatly reduce the labor of the validity confirmation work.
As software in the apparatus, for example, a program (executed by the image forming unit 32-2) that analyzes image data generated and transmitted by the printer driver 12, rasterizes the image data, and develops an image bitmap. Program).

The image processing apparatus according to the present invention has been described with reference to the preferred embodiments. However, the image processing apparatus according to the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. It goes without saying that implementation is possible.
For example, in the present embodiment, the image forming apparatus 30 refers to a network printer connected to the information terminal apparatus 10 via the network 20, but the present invention is not limited to this, and an image processing apparatus such as a printer or a personal computer is used. The same effect can be obtained when the is provided as a single device. When the image processing apparatus is provided alone, old and new image data input from the outside is input to the image processing apparatus via a recording medium such as FD, CD, DVD, flash memory, etc. Even in such a case, the same effect as the above-described embodiment can be obtained. Note that when an image processing apparatus that does not include an image forming unit, such as a personal computer, is provided as a single unit, difference data between the old and new images is transmitted to an image forming apparatus such as a printer via a network.

  In addition, in the image processing apparatus according to the present embodiment, when differential printing is performed, it is possible to simultaneously output a detailed report regarding differential data. Furthermore, this detailed report can be read back to the information terminal device (source host).

The image processing apparatus according to the above embodiment can be executed by an image processing apparatus controlled by a control program. The control program for the image processing apparatus is provided by, for example, a recording medium. As the recording medium, for example, a magnetic disk, an optical disk, a semiconductor memory, or any other means that can be read by an image processing apparatus can be used.
In addition, the control program for the image processing apparatus recorded on the recording medium can be loaded directly into the image processing apparatus and read into the image processing apparatus, or read into the image processing apparatus via a communication line. You may make it.

  It can be applied to image forming devices such as printers, copiers (copiers), composite devices, and image processing terminals such as personal computers that control them, and image processing systems including them, especially when image data changes. This can be suitably used in the case where only the changed part is printed.

1 is a block diagram illustrating an overall configuration of an image processing system according to an embodiment of the present invention. 4 is a print processing designation screen displayed on a monitor of an information terminal device in the image processing system according to the embodiment of the present invention. It is the block diagram which showed the internal structure of the control means of the image processing apparatus which concerns on embodiment of this invention. 2 shows an output example of warning information in the image processing system according to the embodiment of the present invention. 5 is a flowchart illustrating an operation of the image processing apparatus according to the embodiment of the present invention.

Explanation of symbols

10 Information terminal device 11 Image data generation unit (image data generation means)
12 Printer driver (transmission means)
20 Network 30 Image Forming Apparatus 31 Network Interface 32 Control Unit 32-1 Data Analysis Unit (Data Analysis Unit)
32-2 Image Forming Unit (Image Forming Unit)
32-3 Image difference comparison unit (image difference comparison means)
32-4 Image storage unit (image storage means)
32-5 Attribute Difference Comparison Unit (Attribute Difference Comparison Unit)
32-6 Attribute difference storage unit (attribute difference storage means)
32-7 Warning Information Output Unit (Warning Information Output Unit)
33 ROM
34 Engine interface 35 Engine part 36 Display means

Claims (5)

Image storage means for storing first image data input from outside in the past;
Image difference comparison means for comparing the second image data newly input from the outside with the first image data and determining whether or not there is difference data;
When the image difference comparison means determines that there is difference data, the image processing apparatus outputs image data based on the difference data,
The first and second image data has attribute information including at least time information when the data is created,
Attribute difference comparison means for comparing the time information included in the first attribute information of the first image data and the second attribute information of the second image data to determine which image data is newer With
An image processing apparatus that outputs image data determined to be new by the attribute difference comparison means as the difference data. The image processing apparatus according to claim 1.
The image storage means stores the first image data in place of the second image data when the image data determined to be new by the attribute difference comparison means is the second image data. An image processing apparatus. The image processing apparatus according to claim 1 or 2,
Warning information for outputting warning information indicating that the newly input second image data is old image data when the image data determined to be new by the attribute difference comparison means is the first image data An image processing apparatus comprising an output unit. An image processing system having an information terminal device connected to the image processing device according to any one of claims 1 to 3 via a network,
The information terminal device is
Image data generating means for generating the first and / or the second image data;
An image processing system, comprising: a transmission unit configured to transmit the generated image data to the image forming apparatus. An image storage step for storing first image data input from outside in the past;
An image difference comparison step for comparing the second image data newly input from the outside with the first image data and determining whether there is difference data;
A control program for causing an image processing apparatus to execute an image processing step of outputting image data based on the difference data when it is determined that there is difference data in the image difference comparison step;
The first and second image data has attribute information including at least time information when the data is created,
An attribute difference comparison step of comparing the time information included in the first attribute information of the first image data and the second attribute information of the second image data to determine which image data is newer Is further executed by the image processing apparatus,
In the image processing step, the image data determined to be new in the attribute difference comparison step is output as the difference data.

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