CN104469048A - Image forming device and image processing method - Google Patents

Abstract

The present invention provides an image forming apparatus and an image processing method. The image forming apparatus includes: a reading unit for reading an original document; an information obtaining unit for acquiring information on a number of decolorization times, and the information on the number of times of decolorization is designated by a user who can decolorize. When a sheet on which an image is formed on an image forming material is subjected to decolorization processing, how is the decolorization number mark indicating the number of decolorization processing times printed on the sheet printed on the sheet? The decolorization number mark detection part, according to The decolorization frequency flag information acquired by the information acquisition unit detects the decolorization frequency flag included in the image data; and the image processing unit generates image data excluding the detected decolorization frequency flag.

Description

Image forming device and image processing method

technical field

Embodiments described in this specification relate to the number of times of decolorization that is printed when decolorization processing is performed on a sheet on which an image is formed from a decolorable image forming material, and indicates the number of times of decolorization processing performed on the sheet. Image forming apparatus and image processing method for copy processing and scanning processing of marking printed sheets.

Background technique

Conventionally, images have been formed on paper using decolorizable image forming materials such as decolorizable toners. The paper printed with the decolorizing toner can be decolorized by a decolorizing device or an image forming device having a decolorizing function (hereinafter, an image forming device having a decolorizing function is also included in the decolorizing device).

The decolorizing device prints, on the paper that has been decolorized, a decolorization number mark that can identify the number of decolorizations that have been performed on the paper. The decolorization frequency mark is, for example, a mark of a predetermined pattern determined in advance. The color erasing device prints the number of times of erasing mark on a predetermined position of the paper every time the erasing process is performed. Then, for example, a decolorizing device, an image forming apparatus capable of printing with a decolorizing toner, or the like can detect the number of times the sheet has been decolorized so far by reading the decolorizing count mark.

When the number of times of decolorization detected by the decolorization number mark exceeds the allowable number of times, the decolorization device can guide and display to the user that the paper is non-recyclable paper, or can discard the paper deal with.

On the other hand, when copying a document printed with a decolorization number mark or generating image data through scanning processing, the decolorization number mark of the original image of the document that is not the original image to be read is also copied or captured in the original image. in the generated image data.

Contents of the invention

The image forming apparatus of the present embodiment includes a reading unit, an information acquisition unit, a decolorization count mark detection unit, and an image processing unit. The reading section reads a document. The information acquisition unit acquires decolorization count flag information specifying a number indicating the decolorization process printed on the sheet on which the image is formed from the decolorizable image forming material and the decolorization process is performed. How the decolorized frequency mark of the number is printed on the sheet. The decolorization number mark detection unit analyzes the image data generated by the reading unit reading the document based on the decolorization number mark information acquired by the information acquisition unit, and detects the decolorization number mark included in the image data. The image processing unit generates image data in which the detected decolorization frequency mark is excluded when the color erasure frequency mark detection unit detects the color erasure frequency mark in the image data.

Description of drawings

FIG. 1 is a block diagram showing a system configuration of an image forming apparatus.

FIG. 2 is a diagram showing an example of a printed pattern of a color erasure number mark and a printed position of the color erasure number mark on a sheet.

FIG. 3 is a functional block diagram showing the functions of the image forming apparatus according to this embodiment.

FIG. 4 is a flowchart showing the flow of processing of the image forming apparatus according to the present embodiment.

Detailed ways

FIG. 1 is a block diagram showing the system configuration of an image forming apparatus 1 according to the present embodiment. The image forming apparatus 1 is an MFP (Multi Function Peripheral) having multiple functions such as a copy function, a print function, a scan function, and a facsimile function.

First, image forming apparatus 1 includes control unit 2 , auxiliary storage device 8 , printer unit 10 , scanner unit 12 , operation panel 14 , communication interface (communication I/F) 16 , and facsimile control unit (FCU) 18 . The components of the image forming apparatus 1 are connected via a bus 20 .

The control unit 2 functions through a processor 4, a memory 6, and an operating system (Operating System, OS).

Processor 4 is CPU (Central Processing Unit, central processing unit) or MPU (Micro Processing Unit, microprocessor).

The memory 6 is, for example, a semiconductor memory. The memory 6 includes a ROM (Read-Only Memory) 6a storing a control program of the processor 4 and a RAM (Random Access Memory) 6b providing a temporary work area for the processor 4 .

The control unit 2 controls the printer unit 10 , the scanner unit 12 , the operation panel 14 , the communication I/F 16 , the FCU 18 , and the like based on various programs stored in the ROM 6 a or the auxiliary storage device 8 . The control unit 2 may also have various image processing functions. In addition, the control unit 2 may include an ASIC (Application Specific Integrated Circuit, Application Specific Integrated Circuit) that realizes some or all of the functions of the image forming apparatus 1 .

The auxiliary storage device 8 stores application programs and OS. The application programs include programs for executing functions of the image forming apparatus 1 such as a copy function, a print function, a scan function, a facsimile function, and a network file function. The application program also includes an application program (Web browser) for a Web client, other application programs, and the like.

The auxiliary storage device 8 stores image data generated by scanning a document by the scanner unit 12 , data obtained from an external device connected to the communication I/F 16 via the network 130 , and the like. Furthermore, in the present embodiment, the auxiliary storage device 8 temporarily stores a print job transmitted from a client terminal connected via the network 130 until it is executed as a print job.

The auxiliary storage device 8 may be, for example, a magnetic storage device such as a hard disk drive, an optical storage device, a semiconductor storage device (flash memory, etc.), or any combination of these storage devices. The auxiliary storage device 8 appropriately stores software updates, protected electronic documents, text data, account information, policy information, and the like.

The printer unit 10 forms an image corresponding to image data of a document read by the scanner unit 12 and an image corresponding to data transmitted from an external computer such as a client terminal via the network 130 on paper.

The scanner unit 12 includes a built-in scanning and reading unit that reads a document as an image, a document loading table, and an automatic document feeder that transports the document to a scanning position. The scanning and reading unit of the scanning unit 12 reads a document placed on a document placement table or an automatic document feeder.

The operation panel 14 includes a touch panel display unit 14a and various operation keys 14b. The display unit 14 a displays setting contents related to printing conditions such as paper size, number of copies, printing density setting, or post-processing (staple and fold), and operation buttons for changing these settings. The operation keys 14b include, for example, numeric keys, a reset key, a stop key, a start key, and the like.

Communication I/F 16 is an interface for connecting image forming apparatus 1 to external devices such as client terminals via network 130 . The communication I/F 16 is connected to an external device via the network 130 by suitable wireless communication or wired communication conforming to IEEE802.15, IEEE802.11, IEEE802.3, IEEE1284, etc. such as Bluetooth (registered trademark), infrared connection, and optical connection. . The communication I/F 16 includes a buffer, and the communication I/F 16 temporarily stores part or all of data received via the network 130 in the buffer. The control unit 2 controls communication with computers such as client terminals and other external devices connected to the network 130 via the communication I/F 16 .

The facsimile control unit (FCU) 20 executes facsimile transmission processing and reception processing in the image forming apparatus 1 .

Next, the functions of the image forming apparatus 1 of the present embodiment will be specifically described. The image forming apparatus 1 of the present embodiment has a function of removing a decolorization count mark printed on a sheet of an original when copying an original or generating image data by scanning, and copying or generating image data.

Here, the decolorization frequency mark will be described. Currently, an image forming apparatus capable of image formation using an erasable image forming material such as an erasable toner is in use. Furthermore, the sheet on which the image is formed with the decolorizing toner can be reused as printing paper by decolorizing the toner by a decolorizing device capable of decolorizing the decolorizing toner by heating. In addition, the decolorizing device is not only a dedicated device specialized in decolorizing processing, but may also be an image forming device such as an MFP equipped with a decolorizing processing function.

Furthermore, although the decolorized toner image-formed on the sheet is decolorized by the decolorization process, the toner itself remains on the sheet. Therefore, when the color erasing process and the image forming process are repeatedly performed on the same sheet, the toner becomes multi-layered, and if the toner is multi-layered, it becomes difficult to transport the toner or to fix the toner. Therefore, in general, the number of times of reusing along with the decolorization treatment performed on the sheet is limited. Therefore, in order to find out the number of times of decolorization treatment performed on the sheet (that is, the number of times of printing by decolorization toner), the decolorization device can print the decolorization number mark on the sheet at the time of decolorization treatment.

The decolorization number mark is printed on a predetermined position where it is difficult to overlap the original image of the original document and is easy to distinguish from the image of the original document, such as an area on the outer edge side of the area where the image can be formed on the sheet. Furthermore, the decolorization frequency mark is a mark of a predetermined pattern or shape determined in advance so that the decolorization frequency mark can be specified.

The decolorization frequency mark is printed on a predetermined position of the sheet according to a predetermined rule for each decolorization process. For example, when the image forming process and the decolorization process by the decolorization toner are repeated three times, three decolorization frequency marks are printed at predetermined positions on the sheet. The color erasing device and image forming device that can recognize the color erasing frequency mark can detect the color erasing frequency mark on the sheet according to the predetermined printing conditions of the color erasing frequency mark, such as the pattern of the color erasing frequency mark, the printed position, etc. The number of decolorization number marks detected is used to determine the number of decolorization times performed on the sheet (that is, the number of image formation times by decolorization toner).

Here, FIG. 2 shows an example of a printed pattern of the number of times of erasing mark and a printed position of the number of times of erasing mark on the sheet S. As shown in FIG. In FIG. 2, a plurality of decolorization frequency marks 50 are printed on the sheet S, and an enlarged view of a part thereof and an enlarged view of the decolorization frequency mark 50 showing the pattern of the decolorization frequency marks 50 are shown on the left side of the figure. In addition, for easy understanding, the decolorization number mark 50 displayed on the sheet S is displayed larger than the actual size of the sheet.

As long as the pattern of the decolorization frequency mark can be designated as the decolorization frequency mark by the decolorization device, it is not particularly limited. As an example, as shown in Figure 2, the length and width are respectively about 2mm. Checkered mark. Then, in the device (decolorizing device, image forming apparatus 1 of this embodiment, etc.) that designates the decolorization frequency mark, by registering conditions such as the size of the decolorization frequency mark and the size of the lattice of the checkered pattern in advance, the device is A mark satisfying the condition can be judged to be a color erasure count mark.

In addition, the printing area of the color erasing frequency mark on the sheet is not particularly limited, and it is sufficient that the area where the color erasing frequency mark is printed is determined in advance and printed on the area as described above. Although the decolorization frequency mark is printed on the way of conveyance in the decolorizer for the decolorization process, it is conceivable that the decolorizer is located, for example, at the end of the sheet on the left side with respect to the sheet conveyance direction, on the upstream side of the sheet conveyance direction. Rules for position printing erasure times mark. Then, the second and subsequent marks may be printed side by side adjacent to the first erasable number mark.

The sheet S of FIG. 2 has three erasing frequency marks printed on the upper left and two erasing frequency marks printed on the lower right. Therefore, for example, when the number of decolorization times marks are printed according to the above-mentioned rules, the sheet S in FIG. secondary. Therefore, a decolorizing device or the like can detect that the sheet S has been decolorized five times by reading the upper left and lower right marks.

Furthermore, the image forming apparatus 1 of the present embodiment, when detecting the printing of the erasing frequency mark by reading the sheet to be copied, performs image forming processing (copying) on the sheet while excluding the detected erasing frequency mark. . In addition, the image forming apparatus 1 according to the present embodiment generates image data by excluding the decolorization number flag when performing scanning processing to generate image data.

FIG. 3 is a functional block diagram showing functions for realizing the above-described processing of the image forming apparatus 1 of the present embodiment. The image forming apparatus 1 includes an operation input acquisition unit 100 , a reading control unit 102 , a decolorization count detection unit 104 , an image formation processing control unit 106 , an image processing unit 108 , and a data output unit 110 .

The operation input acquisition unit 100 acquires an operation input from the operation panel 14 . Specifically, the operation input acquiring unit 100 acquires an input instructing to perform a copy process on the operation panel 14 and an input instructing to perform a scan process on the operation panel 14 .

The reading control unit 102 controls the scanning unit 12 to read a document placed on the document table or the automatic document feeder when the operation input acquisition unit 100 acquires an input instructing to execute copying or scanning.

The erasing count mark detection unit 104 detects the erasing count mark when the erasing count mark is printed on a document to be read in copy processing or scanning processing. As actual processing, the decolorization count mark detecting unit 104 analyzes whether or not the decolorization count mark exists in a predetermined area of an image read for copying or scanning through image processing. Information specifying the printing position of the erasing frequency mark and the erasing frequency mark may be stored in, for example, the auxiliary storage device 8 of the image forming apparatus 1 as the erasing frequency mark specification information 120 . The number of times of erasing mark detection unit 104 can determine whether the number of times of erasing mark is included in the image of the document by referring to the erasing times mark specification information 120 .

The image forming process control unit 106 controls the image forming process performed by the printer unit 10 . In particular, in this embodiment, when performing copy processing on a document including an erasing number mark, the printer unit 10 can form an image only in an area where the printing area of the erasing number mark is excluded. Specifically, in the case of a rule in which, for example, the number of times of erasing mark is printed from the ends of both ends of the sheet up to a range of 1 cm, information indicating the area where the number of times of erasing mark is printed (erasing The area information of the color number mark) is specified in the decolorization number mark specification information 120. Therefore, the image forming process control unit 106 reduces the area to be printed (effective area) in the image data read and generated by the scanner unit 12 to the inside of a position 1 cm from both ends, based on the decolorization number mark specification information 120 range to form an image on a sheet. Accordingly, the area where the decolorization number mark exists is not printed, and only the required portion of the original document excluding the erasing number mark is copied on the sheet. In order to exclude the erasing number mark, the amount of reducing the effective area which is the area to be printed can be determined from the erasing number mark specifying information 120 specifying the position where the erasing number mark is printed. The function of the above-mentioned image forming processing control unit 106 is not to perform image processing on the read image, but to limit the range of image formation, thereby excluding the number of decolorization marks and image only the original document image as a necessary part. formed function.

The image processing unit 108 removes the decolorization number mark by performing image processing on an image generated by reading the original document when detecting that the original document to be read includes the decolorization number mark. As a method for the image processing unit 108 to remove the number of decolorization marks from the image data, for example, a so-called trimming method can be used to narrow the area of the image data and further process an image without the number of decolorization marks. When the decolorization number mark is printed within a predetermined range of the edge of the sheet, the edge area may be excluded from the image data. The area information specifying the area where the erasing frequency mark is printed may be included in the erasing frequency mark specification information 120 as described above, and the image processing unit 108 can print the area where the color erasing frequency mark is printed based on the erasing frequency mark specification information 120 Exclude from image data. In addition, when the area of the image data is reduced and the decolorization count flag is excluded, the area of the image can be expanded to the size of the original image data again, and image data having the same size as the original image data can be formed.

In addition, as another method of excluding the number of times of erasing marks, it is also possible not to uniformly exclude the area for forming the times of erasing marks as described above, but to specify the positions of the times of erasing marks one by one, and then only erase each erasing time mark. The processing of the part marked with the number of colors. When erasing the number of decolorization marks one by one, for example, the image processing unit 108 can erase the area of the number of decolorization marks by painting the area of the number of decolorization marks with white or the like that is the color of the bottom surface of the sheet. The image processing unit 108 may erase the number of erasing marks within a range that completely matches the number of erasing marks, or may erase a range that also includes the number of erasing marks.

In addition, when the image processing unit 108 erases the number of times of erasing marks one by one, it may erase only the portion of the number of times of erasing marks that is actually printed. That is, for example, if the number of times of erasing mark is a character such as a letter, processing may be performed to erase only the part of the line that is actually printed as a character. For example, when the number of times of erasing mark is a checkered pattern as shown in FIG. 2 , the number of times of erasing mark can be erased by painting only the portion printed in black with white.

The process of removing the decolorization count mark by the image processing performed by the image processing unit 108 described above may be performed on an image used to form an image on a sheet in copy processing, or may be performed on an image generated as a scanned image by scanning processing. image carried.

The data output unit 110 transmits the image data generated by the scanning process to an external device such as a client terminal via the communication I/F 16 , or stores it in the auxiliary storage device 8 of the image forming apparatus 1 . In the present embodiment, the image data from which the number of decolorization flags have been removed by the image processing unit 108 is sent to an external client terminal by the data output unit 110 or stored in the auxiliary storage device 8 or the like.

The above is the function related to the processing performed by the image forming apparatus 1 according to the present embodiment when copying or scanning a document on which the decolorization number mark is printed.

Next, in the image forming apparatus 1 according to the present embodiment, the flow of processing when copy processing or scanning processing is performed on a document including a decolorization number mark will be described.

FIG. 4 is a flowchart showing the flow of copy processing and scanning processing in this embodiment. In addition, in the flowchart of FIG. 4 , as a method of excluding the number of times of erasing mark, the case of reducing the area of the scanned image data by image processing and further excluding the printing area of the number of times of erasing mark is taken as an example. Be explained.

First, the operation input acquiring unit 100 acquires an input instructing copying or scanning from the operation panel 14 , and the reading control unit 102 causes the scanning unit 12 to execute reading of a document to be read (ACT 101 ).

Next, the decolorization count mark detection unit 104 analyzes the image data generated by the scanner unit 12 by reading the document, and detects the decolorization count mark (ACT 102 ).

When the decolorization number mark detection unit 104 determines that there is a color erasure number mark in the image data (Yes in Act 103), the image processing unit 108 reduces the area of the generated image, and reduces the area where the color erasure number mark is printed. Image processing excepted (act 104).

Then, in the case of copy processing (Yes in ACT 105), the image forming processing control unit 106 causes the printer unit 10 to perform image forming processing based on the image data whose area of the decolorization count mark was excluded in ACT 104 (ACT 106). . In the case of scanning (NO in ACT 105 ), the data output unit 110 outputs the image data whose decolorization count flag was excluded in the process of ACT 104 to an external device or stores it in a storage device (ACT 107 ).

In Act 103 , when the erasing count flag detection unit 104 determines that there is no erasing count flag (No in Act 103 ), normal copy processing or scanning processing is executed ( Act 108 ).

The above is the flow of the processing method of the copy processing or scanning processing in the image forming apparatus 1 of the present embodiment. In addition, the process of excluding the number of decolorization marks may be another processing method described above. For example, in the case of copy processing, the image forming processing control unit 106 may reduce the printing area of the printer unit 10 to print, thereby excluding the printing area of the decolorization frequency mark and copying without performing the step of Act 104. Image processing on image data. In addition, as another method performed by image processing, a method of erasing the decolorization number marks one by one may be used.

And, when the decolorization frequency mark detecting section 104 detects the decolorization frequency mark in Act 103, a screen for informing that the document contains the decolorization frequency mark can be displayed on the display panel 14, or it can be confirmed whether to erase the color erasure frequency mark. The screen for making a copy or generating a scanned image is displayed. By performing this user confirmation, when an input instructing the erasing process is performed, the erasing process of the number of erasing flag is performed by any of the methods described above. On the other hand, when an input instructing not to erase is made, copying and image data generation may be performed as usual.

According to the present embodiment described above, when copying a sheet printed on a decolorizable image forming material such as a decolorizable toner, that is, a sheet printed with a decolorization frequency mark indicating the decolorization frequency, or scanning by a scanner, It is possible to perform copy processing or scanning processing while excluding the decolorization count flag of an image that is not an original document. Normally, when copying or scanning a document, the number of decolorization mark is an unnecessary image, so according to this embodiment, only the necessary image portion can be copied or scanned even for a document including the number of erasure mark.

In addition, in this embodiment, although the image forming apparatus 1 has been described as an example of an MFP, it is not limited thereto, and any image forming apparatus that has at least one of a copy function and a scan function is applicable. This embodiment.

Also, in this embodiment, a decolorizable toner has been described as an example of a decolorizable image forming material, but the functions of this embodiment are applicable regardless of the type of decolorizable image forming material. For example, the image forming material may be decolorizable ink used in an inkjet image forming apparatus.

(Modification 1 of the embodiment)

Next, modified examples of the embodiment will be described. In this embodiment, when the decolorization frequency mark detection unit 104 detects the presence of the decolorization frequency mark, the image processing unit 108 performs image processing for erasing the decolorization frequency mark from the generated image, and performs image processing after the erasure. . Specifically, the image processing unit 108 performs processing of supplementing the deleted part from the image around the part where the decolorization number mark has been deleted. For example, when an erasing frequency mark is printed on a portion that already has a certain pattern, color, etc., if the erasing frequency mark is partially erased and only white is applied, the difference between the marked portion and the surrounding portion will be clear. Therefore, the image processing unit 108 estimates the original image of the portion after the erasing number mark is deleted by analyzing the image around the erased number mark, so that the sense of incongruity between the erased portion and its surroundings is reduced. Carry out the process of adding and deleting parts. Specifically, for example, the image processing unit 108 performs supplementary processing by copying the surrounding pixels of the erasing number mark and pasting it on the area where the erasing number mark is erased.

Furthermore, as another method of supplementing the part where the decolorization number mark has been erased, the image processing unit 108 may perform processing of pasting another predetermined image. For example, the logo of the user's company is registered in advance as an image for addition in the auxiliary storage device 8 or the like, and the image processing unit 108 can paste the logo image on the erased portion to perform the addition process.

According to this embodiment, even if the process of erasing the number of decolorization marks is performed, the copy process and the scan image data generation process can be performed with less discomfort between the erased portion and its surroundings.

(Modification 2 of the embodiment)

This embodiment is another modified example of the embodiment. The image forming apparatus 1 according to the present embodiment further includes a flag information adding section. When the flag information adding section detects a decolorization frequency mark in an image generated by reading a document, the image processing section 108 excludes the decolorization flag instead, and performs A process of generating and adding information to image data specifying the number of decolorization flags present in the image. The information specifying the number of times of erasing mark refers to information such as positional information indicating where in the image data the number of times of erasing mark is formed.

Therefore, in the present embodiment, when generating image data by scanning an original printed with a decolorization frequency mark, the data output unit 110 outputs the image data to which the information specifying the decolorization frequency mark generated by the image processing unit 108 is added. It is transmitted to an external client terminal or stored in an auxiliary storage device of the image forming apparatus 1 . Then, in another computer such as a client terminal, the number of decolorization flag can be excluded from the image data afterwards by using the information specifying the decolorization frequency flag added to the image data. Even in the case of excluding the decolorization number mark after the fact, by using the information specifying the decolorization number mark existing in the sheet, the decolorization number mark can be easily excluded.

In this embodiment, the description has been made in the case where the function implementing the invention is registered in the device in advance, but it is not limited to this, and the same function may be downloaded to the device from the network, or the same function may be stored in the device. The devices in the recording medium are mounted on the device. The recording medium may be in any form as long as it is a recording medium such as a CD-ROM that can store a program and is readable by a device. In addition, the functions obtained by preinstalling or downloading in this way may be realized in cooperation with an OS (operating system) or the like inside the device.

As described in detail above, according to the technology described in this specification, it is possible to provide a method that can eliminate unnecessary decolorization frequency marks when copying or scanning originals containing decolorization frequency marks to generate image data. image forming device for image forming processing.

While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel devices and methods described herein may be implemented in various other ways, and various omissions, substitutions, and modifications in form of the devices and methods described herein may be made without departing from the spirit of the invention. Change. The appended claims and their equivalent scope should cover these modes or modifications, and fall within the scope and spirit of the present invention.

Claims (10)

1. An image forming device, characterized in that, comprising: The reading part reads the original; The information acquisition unit acquires decolorization frequency flag information, which is printed on a sheet on which an image is formed of an erasable image forming material and is printed on the decolorization process when the decolorization process is performed. The number of times of decolorization mark information, and the decolorization number mark information specifies the printing conditions for printing on the sheet; The decolorization number mark detection unit analyzes the image data generated by the reading unit reading the original document based on the decolorization number mark information acquired by the information acquisition unit, and detects the decolorization number mark included in the image data; as well as The image processing unit generates image data excluding the detected decolorization frequency mark when the decolorization frequency mark detection unit detects the decolorization frequency mark in the image data. 2. The image forming apparatus according to claim 1, wherein: The image forming apparatus further includes: an image forming process control unit that controls a process of performing image formation on the sheet based on the image data generated by the image processing unit and in which the decolorization number flag is excluded. . 3. The image forming apparatus according to claim 1, wherein: The image forming apparatus further includes: an image forming process control unit that controls to set the The process of image formation on the sheet is performed by excluding the region where the decolorization number mark exists in the image data read and generated by the reading unit. 4. The image forming apparatus according to claim 1, wherein: The decolorization number mark information includes area information specifying an area on the sheet for printing the color erasure number mark, The image processing unit, when the erasing frequency mark is detected by the erasing frequency mark detection unit, generates an image excluding a region for printing the erasing frequency mark based on the area information included in the erasing frequency mark information. image data. 5. The image forming apparatus according to claim 1, wherein: The image forming apparatus further includes a flag information adding unit configured to generate information including at least position information when a color erasure number mark is detected in the image data by the erasure number mark detection unit. The position information designates the position of the detected decolorization count mark in the image data generated by the reading unit by reading the document, and the generated information is added to the generated image data. 6. An image processing method, characterized in that, comprising: read the original; Acquiring decolorization number mark information, the decolorization number mark information being printed on the sheet showing the number of decolorization processing when the decolorization process is performed on the sheet formed with the image forming material that can be decolorized. Information on the color number mark, and the color erasure number mark information designates printing conditions for printing on the sheet; Analyzing the image data generated by reading the original document based on the obtained information on the number of times of erasure, and detecting the number of erasure marks included in the image data; and When the number-of-erasing flag is detected in the image data, image data excluding the detected number-of-erasing flag is generated. 7. image processing method according to claim 6, is characterized in that, Image formation is performed on the sheet based on the image data from which the decolorization order flag is excluded. 8. The image processing method according to claim 6, wherein: When the decolorization number mark is detected in the image data, an image is formed on the sheet so as to exclude a region in which the decolorization number mark exists in the image data generated by reading the document. 9. image processing method according to claim 6, is characterized in that, The decolorization number mark information includes area information specifying an area on the sheet for printing the color erasure number mark, When the erasing frequency mark is detected in the image data, image data excluding the area for printing the erasing frequency mark is generated based on the area information included in the erasing frequency mark information. 10. The image processing method according to claim 6, wherein: When the decolorization frequency mark is detected in the image data, information including position information specifying at least the position of the decolorization frequency mark in the image data generated by reading the original document is generated, and the information is added to the generated of the image data, Based on the information added to the image data, image data in which the detected decolorization count flag is excluded is generated.