JP2015047736A - Image adjusting device, image formation device, and image adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image adjusting device capable of image adjusting to adapt to an image to be printed with high possibility.SOLUTION: An image adjusting part 1 includes a memory part 5, an analysis part 7, a decision part 9, and an adjusting part 11. The memory part 5 stores an analysis result of a printed image and an image adjusting parameter calculated based on the printed image. The analysis part 7 analyses an image to be printed. The decision part 9, based on comparison between the analysis result of the printed image and the analysis result of the image to be printed, decides whether or not to use the image adjusting parameter. The adjusting part 11, based on the image adjusting parameter that is decided to use, adjusts picture quality of the image to be printed.

Description

  The present invention relates to an image adjustment apparatus, an image forming apparatus, and an image adjustment method for adjusting the image quality of an image to be printed.

  In the multifunction device disclosed in Patent Document 1, the user can set a plurality of printing conditions. Printing conditions include print quality. There are high-detail mode and draft mode as print quality.

  The multi-function peripheral manages past setting histories for each printing condition using a table in which each printing condition is associated with the set number of times. Then, the multifunction device suppresses a printing error caused by the user forgetting to set the printing condition by changing the initial value of the printing condition based on the past setting history.

JP 2012-131107 A

  However, in the MFP of Patent Document 1, since the initial value of the printing condition is changed based on the past setting history, the information of the image to be printed is not reflected in the initial value. Therefore, image adjustment that matches the image to be printed may not be executed, and a print result with image quality that satisfies the user may not be obtained.

  The present invention has been made in view of the above problems, and an object thereof is to provide an image adjustment apparatus, an image forming apparatus, and an image adjustment method capable of executing an image adjustment that is highly likely to match an image to be printed. It is in.

  According to a first aspect of the present invention, an image adjustment apparatus includes a storage unit, an analysis unit, a determination unit, and an adjustment unit. The storage unit stores the analysis result of the printed image and the image adjustment parameter calculated based on the printed image. The analysis unit analyzes the image to be printed. The determining unit determines whether or not to use the image adjustment parameter based on a comparison between the analysis result of the printed image and the analysis result of the image to be printed. The adjustment unit adjusts the image quality of the image to be printed based on the image adjustment parameter determined to be used.

  According to a second aspect of the present invention, an image forming apparatus includes the image adjustment apparatus according to the first aspect of the present invention and an image forming unit. The image forming unit forms the image, the image quality of which has been adjusted by the image adjusting device, on a sheet.

  According to a third aspect of the present invention, the image adjustment method includes the step of analyzing the image to be printed, and based on a comparison between the analysis result of the printed image and the analysis result of the image to be printed. Determining whether to use an image adjustment parameter calculated based on a completed image; adjusting an image quality of the image to be printed based on the image adjustment parameter determined to be used; including.

  According to the present invention, the image adjustment parameter to be used is determined based on the analysis result of the printed image and the analysis result of the image to be printed. Therefore, in the process of determining the image adjustment parameter, not only the information on the printed image but also the information on the image to be printed is reflected. As a result, it is possible to perform image adjustment that has a high possibility of matching the image to be printed.

It is a block diagram which shows the image adjustment part which concerns on Embodiment 1 of this invention. It is a conceptual diagram of the data memorize | stored in the memory | storage part shown in FIG. It is a block diagram which shows the whole structure of the image forming apparatus carrying the image adjustment part shown in FIG. FIG. 4 is a schematic cross-sectional view for explaining the outline of the image forming apparatus shown in FIG. 3. 6 is a flowchart illustrating processing of the image forming apparatus according to the second exemplary embodiment of the present invention. It is a flowchart which shows step S15 of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof is not repeated.

(Embodiment 1)
[Basic principle]
The basic principle of the image adjusting unit 1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the image adjustment unit 1. The image adjustment unit 1 functions as an image adjustment device. The image adjustment unit 1 includes a processing unit 3 and a storage unit 5. The processing unit 3 includes an analysis unit 7, a determination unit 9, and an adjustment unit 11.

  The storage unit 5 stores the analysis result of the printed image and the image adjustment parameter calculated based on the printed image. The analysis unit 7 analyzes the image to be printed. The determination unit 9 determines whether or not to use the image adjustment parameter based on a comparison between the analysis result (for example, the printing rate) of the printed image and the analysis result (for example, the printing rate) of the image to be printed. . The adjustment unit 11 adjusts the image quality of the image to be printed based on the image adjustment parameter determined to be used.

  According to the first embodiment, the image adjustment parameter to be used is determined based on the analysis result of the printed image and the analysis result of the image to be printed. Therefore, in the process of determining the image adjustment parameter, not only the information on the printed image but also the information on the image to be printed is reflected. As a result, it is possible to perform image adjustment that has a high possibility of matching the image to be printed.

[Details of Image Adjustment Unit 1]
Details of the image adjustment unit 1 will be described with reference to FIGS. 1 and 2. FIG. 2 is a conceptual diagram of data stored in the storage unit 5. The processing unit 3 of the image adjustment unit 1 can further include a determination unit 13 and a calculation unit 15. In the first embodiment, the image adjustment unit 1 executes the following processing for each user. Hereinafter, the printing rate is given as an example of the image analysis result.

  The storage unit 5 stores a printing rate of the printed image and an image adjustment parameter calculated based on the printed image. The analysis unit 7 calculates the printing rate of the image to be printed by analyzing the image to be printed.

  The printing rate is a ratio between the area of a sheet (for example, paper) where an image can be formed (printed) and the area where an image is actually formed (printed). The area in this case is a value of the area itself or a value correlated with the area. For example, the printing rate is a ratio B / A between the number A of dots that can be printed on a sheet and the number B of dots that form an image printed on the sheet. The image adjustment parameter is a parameter for adjusting the image quality of an image formed (printed) on the sheet. For example, the image adjustment parameter is density or edge sharpness.

  The determination unit 9 determines the image adjustment parameter (that is, the image adjustment calculated based on the printed image) stored in the storage unit 5 based on the comparison between the printing rate of the printed image and the printing rate of the image to be printed. Parameter) is used.

  Specifically, when the determination unit 9 determines that the printing rate of the printed image is included in the predetermined range R including the printing rate of the image to be printed (that is, when it is determined that the two printing rates match). Then, it is determined to use the image adjustment parameter stored in the storage unit 5. For example, the predetermined range R is (p−1) to (p + 1) when the printing rate of the image to be printed is p%. On the other hand, when the determination unit 9 determines that the print rate of the printed image is not included in the predetermined range R (that is, when it is determined that the print rates of both do not match), the determination unit 9 uses a preset image adjustment parameter. Decide what to do. In the first embodiment, the preset image adjustment parameter is an image adjustment parameter set as an initial value.

  When the determining unit 9 determines that the printing rate of the printed image is not included in the predetermined range R, the calculating unit 15 calculates an image adjustment parameter based on the image to be printed. For example, the calculation unit 15 calculates image adjustment parameters based on the printing rate. Further, the calculation unit 15 can refer to the determination result by the determination unit 13 when calculating the image adjustment parameter. Specifically, it is as follows.

  The determination unit 13 determines whether the image to be printed belongs to the symbol category or the line drawing category based on the printing rate of the image to be printed. An example of judgment will be given. When the printing rate is less than 5%, the determination unit 13 determines that the image to be printed belongs to the line drawing category. When the printing rate is 5% or more and less than 20%, the determination unit 13 determines that the image to be printed belongs to the symbol category. The meaning of the symbol includes letters and numbers. When the printing rate is 20% or more, the determination unit 13 determines that the image to be printed belongs to another category. When the printing rate is 20% or more, the determination unit 13 may determine that the image to be printed belongs to the photo category.

  When it is determined that the image to be printed belongs to the symbol category, the calculation unit 15 calculates an image adjustment parameter so that the printing is more suitable for symbol printing than for line drawing. On the other hand, when it is determined that the image to be printed belongs to the line drawing category, the calculation unit 15 calculates the image adjustment parameter so as to suit the printing of the line drawing rather than the symbol.

  The storage unit 5 stores the image adjustment parameter calculated by the calculation unit 15 (that is, the image adjustment parameter based on the image to be printed) and the printing rate calculated by the analysis unit 7 (that is, the printing rate of the image to be printed). . Specifically, as illustrated in FIG. 2, the storage unit 5 includes a user, a printing rate of an image to be printed, an image adjustment parameter calculated based on the image to be printed, and an image to be printed. Associate and remember categories. In this case, the storage unit 5 updates the stored printing rate, image adjustment parameter, and category with the calculated printing rate, image adjustment parameter, and category.

  The print rate, image adjustment parameter, and category stored in the storage unit 5 are the print rate of the printed image, the image adjustment parameter calculated based on the printed image, and the next print target of the same user, respectively. A category of printed images. Therefore, based on the latest print target, the storage unit 5 stores the analysis result (that is, the printing rate) of the printed image, the image adjustment parameter calculated based on the printed image, and the category to which the printed image belongs. Is stored for each user. Note that the category can be not stored.

[Parts of Image Forming Apparatus 100]
A main part of the image forming apparatus 100 in which the image adjusting unit 1 is mounted will be described with reference to FIGS. FIG. 3 is a block diagram illustrating the overall configuration of the image forming apparatus 100.

  The image forming apparatus 100 includes a main control unit 20, an engine control unit 25, a document conveying unit 30, an image reading unit 40, an operation panel 50, a paper feeding unit 60, a conveying unit 70, an image forming unit 80, and a fixing unit 90. . The main control unit 20 includes a control unit 22 and an image adjustment unit 1. The image adjustment unit 1 includes a processing unit 3 and a storage unit 5. The storage unit 5 is used not only as a storage area of the processing unit 3 but also as a storage area of the control unit 22. The storage unit 5 includes a main storage device (for example, a semiconductor memory) and an auxiliary storage device (for example, a semiconductor memory or a hard disk drive).

  The main control unit 20 controls the entire image forming apparatus 100. Specifically, the control unit 22 controls the document conveying unit 30, the image reading unit 40, the operation panel 50, and the engine control unit 25 by executing a computer program stored in the storage unit 5. The control unit 22 is, for example, a CPU (Central Processing Unit).

  The control unit 22 sends a command to the engine control unit 25 to indirectly control each unit (the paper feeding unit 60, the conveyance unit 70, the image forming unit 80, and the fixing unit 90). Each unit is directly connected to the engine control unit 25, and the engine control unit 25 directly controls each unit autonomously or according to a command from the main control unit 20.

  When there is a print request from the user, the processing unit 3 of the image adjustment unit 1 determines an image adjustment parameter to be used based on the print rate of the printed image and the print rate of the image to be printed. Then, the processing unit 3 adjusts the image quality of the image to be printed based on the image adjustment parameter determined to be used. Further, the processing unit 3 gives image data (image data) whose image quality has been adjusted to the engine control unit 25. The processing unit 3 is, for example, an ASIC (Application Specific Integrated Circuit).

  The engine control unit 25 controls the image forming unit 80 to form (print) an image on the sheet P based on the image data given from the processing unit 3. As a result, the image forming unit 80 forms (prints) an image whose image quality has been adjusted by the image adjusting unit 1 on the sheet P.

[Outline of Image Forming Apparatus 100]
The outline of the image forming apparatus 100 will be described with reference to FIGS. 3 and 4. FIG. 4 is a schematic cross-sectional view for explaining the outline of the image forming apparatus 100. The document conveyance unit 30 conveys the document toward the image reading unit 40. The image reading unit 40 reads an image of a document and generates image data. The operation panel 50 functions as an input unit for performing various settings and a display unit for displaying various information.

  The paper feed unit 60 includes a paper feed cassette 62 and a manual feed tray 64. The sheet feeding cassette 62 stores sheets P. The manual feed tray 64 stacks manual sheets P. The sheet P is sent out from the paper feed cassette 62 or the manual feed tray 64 to the conveyance unit 70. The sheet P is, for example, plain paper, recycled paper, thin paper, thick paper, and an OHP (Overhead Projector) sheet.

  The conveyance unit 70 conveys the sheet P to the image forming unit 80. The image forming unit 80 forms (prints) an image on the sheet P as follows. The image forming unit 80 includes a photosensitive drum 81, a charging unit 82, an exposure unit 83, a developing unit 84, a transfer unit 85, a cleaning unit 86, and a charge eliminating unit 87.

  The charging unit 82 charges the surface of the photosensitive drum 81. The exposure unit 83 irradiates the surface of the photosensitive drum 81 with light based on the image data generated by the image reading unit 40 or the image data supplied from the image adjustment unit 1. As a result, an electrostatic latent image corresponding to the image data is formed on the surface of the photosensitive drum 81.

  The developing unit 84 develops the electrostatic latent image formed on the surface of the photoconductive drum 81 and forms a toner image on the surface of the photoconductive drum 81. As the sheet P is supplied between the photosensitive drum 81 and the transfer unit 85, the transfer unit 85 transfers the toner image onto the sheet P.

  The sheet P to which the toner image is transferred is conveyed toward the fixing unit 90. The fixing unit 90 heats and pressurizes the sheet P to fix the toner image on the sheet P. Then, the discharge roller pair 72 discharges the sheet P to the discharge tray 74. The cleaning unit 86 removes toner remaining on the surface of the photosensitive drum 81. The neutralization unit 87 removes residual charges on the surface of the photosensitive drum 81.

  As described above with reference to FIGS. 1 and 2, according to the first embodiment, when the printing rate of the image to be printed matches the printing rate of the printed image, the image adjustment unit 1 performs printing. Perform image adjustment using image adjustment parameters calculated based on the finished image. As a result, it is possible to automatically execute image adjustment that has a high possibility of conforming to the image to be printed. In particular, the printing rate is effective as an index that directly represents the characteristics of an image. Therefore, the image adjustment can be effectively executed by determining the image adjustment parameter based on the printing rate. In addition, as long as the printing rates match, the image adjustment parameters stored in the storage unit 5 can be used, so that the time for calculating the image adjustment parameters can be reduced. Furthermore, since the image adjustment parameter is automatically determined and the image adjustment is executed, it is possible to save the user from setting the image adjustment parameter.

  Furthermore, according to the first embodiment, when the printing rate of the image to be printed does not match the printing rate of the printed image, the image adjustment unit 1 uses the image adjustment parameter set as the initial value. Perform image adjustment. The initial value is not a value specific to a specific image (for example, a symbol or a line drawing), but is set so as to widely correspond to a wide variety of images. Therefore, when the print ratios do not match, it is more likely that image adjustment suitable for the image to be printed can be executed than when the image adjustment parameter calculated based on the printed image is used.

  Furthermore, according to the first embodiment, when the printing rate of the image to be printed does not match the printing rate of the printed image, the image adjustment unit 1 calculates an image adjustment parameter based on the image to be printed. . Then, the image adjustment unit 1 stores the image adjustment parameter in the storage unit 5 together with the printing rate of the image to be printed. In general, if the print request is from the same user, there is a high possibility that the print rates of consecutive images to be printed match. Therefore, by storing the image adjustment parameters based on the first print target image, it is possible to effectively adjust the image quality for the subsequent print target images using the stored image adjustment parameters.

  Furthermore, according to the first embodiment, the image adjustment unit 1 uses image adjustment parameters calculated so as to be suitable for symbol printing for images belonging to the symbol category, and belongs to the line drawing category. For an image, the image quality can be adjusted using image adjustment parameters calculated to suit line drawing printing. As a result, printing adapted to symbols and printing adapted to characters can be executed.

  As described with reference to FIG. 2, according to the first embodiment, the storage unit 5 stores the printing rate and the image adjustment parameter for each user. Therefore, the image adjustment unit 1 can execute image adjustment according to the printing tendency of each user.

  As described with reference to FIG. 3, according to the first embodiment, when a print request is received from the user, the image forming apparatus 100 displays an image whose image quality has been adjusted by the image adjustment unit 1 as a sheet P. Formed (printed). Since image adjustment that is highly likely to match the image to be printed is executed, a printing result with a high degree of satisfaction for the user can be obtained.

(Embodiment 2)
An image forming apparatus 100 according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a flowchart showing processing of the image forming apparatus 100. FIG. 6 is a flowchart showing step S15 of FIG.

  The description will focus on the differences between the image forming apparatus 100 according to the second embodiment and the image forming apparatus 100 according to the first embodiment. In the first embodiment, the processing unit 3 of the image adjustment unit 1 is formed by hardware. In contrast, in the second embodiment, the processing unit 3 is formed by software. Therefore, the control unit 22 functions as the processing unit 3 by executing the computer program stored in the storage unit 5. The control unit 22 and the storage unit 5 function as the image adjustment unit 1. The image adjustment unit 1 can also be formed by hardware and software.

  Hereinafter, an example of processing will be described with reference to FIGS. 5 and 6. The control unit 22 executes the following processing for each user (a concept including a personal computer).

  In step S1, the control unit 22 determines whether a print request has been received from the user. If a positive determination (Yes) is made, the process proceeds to step S3. On the other hand, if a negative determination (No) is made, the process proceeds to step S27. In step S <b> 27, the control unit 22 determines whether the image forming apparatus 100 is powered off. When a positive determination (Yes) is made, the control unit 22 ends the process. On the other hand, if a negative determination (No) is made, the process returns to step S1.

  After a positive determination is made in step S1, in step S3, the control unit 22 analyzes the image to be printed and calculates the printing rate. Step S3 corresponds to the step of analyzing the image to be printed.

  In step S <b> 5, the control unit 22 determines whether the printing rate of the printed image is stored in the storage unit 5 in response to the user who transmitted the print request. If a negative determination (No) is made, the process proceeds to step S15. For example, when the user makes a print request to the image forming apparatus 100 for the first time, a negative determination is made in step S5. On the other hand, when a positive determination (Yes) is made, the process proceeds to step S7.

  In step S <b> 7, the control unit 22 determines whether the print rate of the image to be printed matches the print rate of the printed image. A specific determination method is the same as the determination method by the determination unit 9 (see FIG. 1). If a positive determination (Yes) is made, the process proceeds to step S9. On the other hand, if a negative determination (No) is made, the process proceeds to step S15. Step S7 corresponds to a step of determining whether or not to use the image adjustment parameter calculated based on the printed image based on the comparison between the analysis result of the printed image and the analysis result of the image to be printed. .

  In step S15, the control unit 22 starts calculating image adjustment parameters based on the image to be printed. Specifically, as shown in FIG. 6, in step S31, the control unit 22 determines which of the three categories (symbol category, line drawing category, and other categories) the image to be printed belongs to. Determine.

  If it is determined that the image to be printed belongs to the symbol category, the process proceeds to step S33. In step S <b> 33, the control unit 22 starts calculating image adjustment parameters based on the image to be printed so as to be more suitable for printing symbols than line drawings. After calculation starts, the process proceeds to step S17 in FIG.

  On the other hand, if it is determined that the image to be printed belongs to the line drawing category, the process proceeds to step S35. In step S35, the control unit 22 starts calculating image adjustment parameters based on the image to be printed so as to be more suitable for line drawing printing than symbols. After calculation starts, the process proceeds to step S17 in FIG.

  If it is determined that the image to be printed does not belong to the symbol category or the line drawing category, that is, if it is determined that the image to be printed belongs to another category, the processing is step S17 in FIG. Proceed to

  Returning to FIG. 5, in step S <b> 17, the control unit 22 acquires the image adjustment parameter set as the initial value from the storage unit 5. In step S19, the control unit 22 adjusts the image quality of the image to be printed based on the image adjustment parameter acquired in step S15 (image adjustment). In step S21, the control unit 22 controls the image forming unit 80 via the engine control unit 25 so as to form (print) the image whose image quality has been adjusted in step S19 on the sheet P (print execution).

  In step S23 after the negative determination is made in step S5, the control unit 22 obtains the user who transmitted the print request, the printing rate calculated in step S3, and the calculation started in step S15. The stored image adjustment parameters and the category determined in step S31 (FIG. 6) are newly stored in the storage unit 5.

  In step S23 after the negative determination is made in step S7, the control unit 22 determines the print rate, the image adjustment parameter, and the category stored in the storage unit 5 in association with the user who transmitted the print request. These are updated according to the printing rate calculated in step S3, the image adjustment parameter obtained by starting the calculation in step S15, and the category determined in step S31 (see FIG. 6).

  After a positive determination is made in step S7, in step S9, the control unit 22 stores the image adjustment parameter calculated based on the printed image from the storage unit 5 (that is, associated with the user who transmitted the print request). Acquisition image adjustment parameters). In step S11, the control unit 22 adjusts the image quality of the image to be printed based on the image adjustment parameter acquired in step S9 (image adjustment). Step S11 corresponds to a step of adjusting the image quality of the image to be printed based on the image adjustment parameter determined to be used. In step S13, the control unit 22 controls the image forming unit 80 via the engine control unit 25 so as to form (print) the image whose image quality has been adjusted in step S11 on the sheet P (print execution).

  In step S25, the control unit 22 determines whether there is a print target subsequent to the print target printed in step S13 or step S21. If a negative determination (No) is made, the process proceeds to step S1. On the other hand, if an affirmative determination (Yes) is made, the process proceeds to step S3. However, in step S25, an affirmative determination is made on the condition that the user is the same as the subsequent user to be printed.

  As described above with reference to FIGS. 5 and 6, in the second embodiment, as in the first embodiment, when the printing rate of the image to be printed matches the printing rate of the printed image, the control unit 22 performs image adjustment using image adjustment parameters calculated based on the printed image. As a result, it is possible to automatically execute image adjustment that has a high possibility of matching the image to be printed. In addition, the second embodiment has the same effects as the first embodiment.

  The present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

  (1) In the first and second embodiments described with reference to FIGS. 1 to 6, the printing rate is adopted as the image analysis result, and the image adjustment parameter is determined based on the printing rate. However, the analysis result of the image is not limited to the printing rate, and for example, the color, tone, or the contents represented by the image (for example, obtainable by image recognition) can be adopted.

  (2) In the first and second embodiments described with reference to FIG. 2, if the printing rate of the image to be printed does not match the printing rate of the printed image, the storage unit 5 stores the old data (printing rate). , Old data indicating image adjustment parameters and categories) was updated with new data (new data indicating print rate, image adjustment parameters and categories). However, the storage unit 5 can also accumulate data (old data indicating the printing rate, image adjustment parameters, and categories) for each user without updating (overwriting).

  (3) In the first and second embodiments described with reference to FIGS. 1 to 6, the validity / invalidity of the image adjustment unit 1 (a process for performing image adjustment based on the printing rate) is set for each user. be able to.

  (4) For the image forming apparatus 100 described with reference to FIG. 3, the user can set image adjustment parameters by a printer driver. For example, the user can set one of image quality priority, character priority, and automatic adjustment. The user can make detailed adjustments using the slide bar of the printer driver. In the automatic adjustment, an image adjustment parameter intermediate between image quality priority and character priority is set.

  When the user has set image quality priority or character priority, the image adjustment unit 1 can be disabled and the image adjustment parameter set by the user can be used. On the other hand, when the user sets automatic adjustment or when nothing is set at the time of print request, the image adjustment unit 1 is enabled.

  (5) As described with reference to FIGS. 1 and 5, when the printing rate of the image to be printed and the printing rate of the printed image do not match, image adjustment is performed according to the image adjustment parameter set as the initial value. Executed (for example, step S17, step S19). The initial value of the image adjustment parameter used in this case can be arbitrarily set by the user, the dealer, or the manufacturer, or the initial value once changed can be returned to the factory default value. At the time of factory shipment, the initial value is an intermediate image adjustment parameter between image quality priority and character priority.

  (6) The image forming apparatus 100 described with reference to FIGS. 3 and 4 is, for example, a copying machine, a printer, or a facsimile. The image forming apparatus 100 is, for example, a multifunction machine having two or more functions of a copying machine, a printer, and a facsimile machine.

  The present invention can be used, for example, in the field of image forming apparatuses that form images on sheets.

DESCRIPTION OF SYMBOLS 1 Image adjustment part 3 Processing part 5 Memory | storage part 7 Analysis part 9 Determination part 11 Adjustment part 13 Determination part 15 Determination part 15 Calculation part 20 Main control part 22 Control part 30 Original conveyance part 40 Image reading part 50 Operation panel 60 Paper feed part 70 Conveyance part 80 Image forming unit 90 Fixing unit 100 Image forming apparatus

Claims (10)

A storage unit for storing the analysis result of the printed image and an image adjustment parameter calculated based on the printed image;
An analysis unit for analyzing an image to be printed;
A determination unit that determines whether to use the image adjustment parameter based on a comparison between the analysis result of the printed image and the analysis result of the image to be printed;
An image adjustment apparatus comprising: an adjustment unit that adjusts an image quality of the image to be printed based on the image adjustment parameter determined to be used. The analysis result of the printed image indicates a printing rate of the printed image,
The analysis result of the image to be printed indicates a printing rate of the image to be printed,
The image adjustment apparatus according to claim 1, wherein the analysis unit calculates a printing rate of the image to be printed by analyzing the image to be printed.   The said determination part determines using the said image adjustment parameter, when it determines with the printing rate of the said printed image being included in the predetermined range containing the printing rate of the image of the said printing object. Image adjustment device.   The image adjustment device according to claim 3, wherein the determination unit determines to use a preset image adjustment parameter when it is determined that a print rate of the printed image is not included in the predetermined range. When the determining unit determines that the printing rate of the printed image is not included in the predetermined range, the calculating unit further includes a calculating unit that calculates an image adjustment parameter based on the image to be printed,
The image adjustment apparatus according to claim 4, wherein the storage unit stores a printing rate calculated by the analysis unit and an image adjustment parameter calculated by the calculation unit. A determination unit that determines whether the image to be printed belongs to a symbol category or a line drawing category based on a print rate of the image to be printed;
When it is determined that the image to be printed belongs to the category of the symbol, the calculation unit calculates the image adjustment parameter so as to suit the printing of the symbol rather than the line drawing, and the image to be printed is The image adjustment device according to claim 5, wherein when it is determined that the image belongs to the line drawing category, the image adjustment parameter is calculated so as to be more suitable for printing the line drawing than the symbol.   The said printing rate is a ratio of the area of the area | region which can form an image among sheets, and the area of the area | region in which the said image is formed of any one of Claims 2-6. Image adjustment device.   The storage unit according to any one of claims 1 to 7, wherein the storage unit stores an analysis result of the printed image and an image adjustment parameter calculated based on the printed image for each user. Image adjustment device. The image adjustment apparatus according to any one of claims 1 to 8,
An image forming apparatus comprising: an image forming unit that forms, on a sheet, the image whose image quality has been adjusted by the image adjusting apparatus. Analyzing the image to be printed;
Determining whether to use an image adjustment parameter calculated based on the printed image based on a comparison of the analysis result of the printed image and the analysis result of the image to be printed;
Adjusting the image quality of the image to be printed based on the image adjustment parameter determined to be used.

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