JP4532888B2 - Information processing apparatus, information processing system, printing method, printing program, and recording medium - Google Patents

Description

The present invention relates to an information processing apparatus , an information processing system, a printing method, a printing program , and a recording medium, and more particularly to calibration in an image forming apparatus.

  Conventionally, a printing apparatus has been widely used as an apparatus for outputting image information and the like. For example, in an electrophotographic printing apparatus using a laser beam (hereinafter also referred to as a printer), it is possible to fix toner on a sheet. A visual image is formed, and a visible image is formed by ejecting ink onto paper in an inkjet printing apparatus.

  This printing process and printing mechanism have become complicated due to recent high resolution and colorization of printers. In addition, the electrical and mechanical states of the printer when the visible image is formed due to environmental changes, wear of each part, etc. may change, and the visible image formed by the printer may change. . For example, it is known that the density or gradation of density changes in an image printed by a printer, and the color tone changes in a color image. For this reason, conventionally, a correction process for the γ correction table, that is, a process called calibration is performed in order to cope with the change in the printed image. Hereinafter, calibration performed in an information processing system including at least a host device and a printer will be described.

  As a first example, there is a case where print data is transmitted to a printer in the form of a print job converted into PDL. The host device (hereinafter simply referred to as a host) does not perform calibration processing, and the controller unit included in the printer has A calibration request is received from the engine unit of the printer at a predetermined timing, the correction table is updated according to the calibration request, and calibration is performed using the updated correction table. Thereafter, when a print job is received from the host device side, the controller unit included in the printer corrects the image data (print job) using a new correction table.

  As a second example, there is a case where all print data is transmitted to the printer in the form of a binary print job. As shown in FIGS. 11 and 12, the host device (10) that processes the print data The printer (20) is connected to a printer capable of bidirectional communication, the host device (10) requests calibration information from the printer (20) for each print job, and the host device (10) is connected to the printer (20). Calibration information is acquired from the) side, a new correction table is generated based on the acquired calibration information, calibration is performed, and image data (print job) is generated using the generated new correction table. Is.

  However, in the second example described above, since calibration is executed in units of print jobs, it is difficult to prevent image quality deterioration in the case of print jobs that print a large amount of the same information. For example, as shown in FIG. 12, when a print job outputs 900 data for one page, the printer (20) first outputs a patch based on the theoretical density value of k gradation at the start of printing. Is measured to obtain the state of the printer (20) expressed as an actual density value, and the obtained state of the printer (20) is transferred to the host device (10) as calibration information. Then, the host device (10) performs calibration by updating the density correction value in the correction table based on the calibration information. Then, a print job in which the print data is corrected with reference to a new correction table is created. When the printing process is performed based on this print job, the state of the printer (20) does not change in a state where the number of printed sheets is short, for example, the first sheet to the 30th sheet. Or, since the state change is small, even if a print job created by referring to the state of the printer (20) at the start of printing is used, the calibration effect is effective and the output result is free from quality deterioration.

  However, as the number of output sheets increases, the state of the printer (20) changes, and a difference occurs between the correction amount to be actually applied and the correction amount applied to the print job by calibration. In other words, in a state where the number of printed sheets is large near the end of printing, for example, from the 700th sheet to the 850th sheet, this difference also becomes large, and the difference in the correction amount appears significantly in the output result. In other words, as shown in FIG. 13, it is desirable that the output result of the first page as the start page and the output result of the 900th sheet as the last page should have the same print quality, but it is proportional to the number of prints, for example. As a result, the output result changes, and finally, as shown in FIG. 14, the change in the quality of the first page output result and the last page 900 output result is significantly different. . In contrast, the user can consciously divide the number of times of printing and generate a print job multiple times. For example, the operation of outputting 300 pages of data for one page can be repeated three times to avoid quality degradation. It is. However, it is difficult to accurately grasp the status change of the printer (20) for each division. It is also conceivable that the state change of the printer (20) is checked in advance for each number of divisions, and the correction result is empirically reflected in each print job based on the result. However, in this case, the time efficiency is lowered and unnecessary output is performed.

  Further, in the first example of calibration described above, for example, when 900 pages of data as shown in FIG. 14 are output, once the printing process is started, the printer (20) prints 900 sheets. It will be occupied until the end. For this reason, calibration cannot be executed until a large amount of printing is completed.

  In order to solve the above problems, as a technical document filed prior to the present invention, even when printing a large amount of the same information, calibration is appropriately performed, and information processing that does not cause degradation in output quality There are a system, a printing method, and an image processing method (see, for example, Patent Document 1).

In this patent document 1, the host apparatus divides a job based on predetermined calibration execution timing information, acquires the latest calibration information from the printer side for each divided job, and acquires the acquired calibration. The density correction value of the γ correction table is updated based on the information, and the divided job is printed using the γ correction table that has been calibrated.
JP-A-11-157177

  However, Patent Document 1 describes that the job division form can be determined from the print data and the density change rate. Specifically, the number of the calibrated sheets and the density change rate are described. Only the history information is displayed, and the user must set an optimal division size empirically from the history information. That is, since the division size for dividing a print job into a plurality of divided jobs depends on the user's judgment, it is difficult for a user unfamiliar with the operation to make an appropriate setting, and the number of divisions for each printing is set Setting from history information or the like is a complicated task even for a skilled user, and the operability is lowered.

The present invention has been made in view of the above circumstances, and an information processing apparatus , an information processing system, and an information processing apparatus that can always appropriately set the number of prints to divide a print job without requiring judgment by a user, It is an object of the present invention to provide a printing method, a printing program , and a recording medium.

  In order to achieve this object, the present invention has the following features.

<Information processing device>
An information processing apparatus according to the present invention includes:
An information processing apparatus that transmits print data corrected by correction data to a printing apparatus, and performs printing processing based on the print data in the printing apparatus,
Storage means for acquiring the latest calibration information held by the printing apparatus, and storing the acquired latest calibration information;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. A rate of change calculation means;
A calculation means for calculating a value obtained by dividing a preset reference change amount by an average change rate of the past N (N is an arbitrary integer) times calculated by the change rate calculation means;
Setting means for setting the value calculated by the calculating means as an output sheet number indicating the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration Job dividing means for sequentially transferring the plurality of divided jobs to the printing device;
Calibration means for updating the correction data based on the latest calibration information each time the plurality of divided jobs are sequentially transferred to the printing apparatus by the job dividing means;
Print data correction means for correcting print data of the divided job based on the correction data updated by the calibration means;
It is characterized by having.

<Information processing system>
An information processing system according to the present invention includes:
An information processing apparatus having an information processing apparatus and a printing apparatus, wherein the information processing apparatus transmits print data corrected by correction data to the printing apparatus, and performs printing processing based on the print data in the printing apparatus A system,
The information processing apparatus includes:
Storage means for acquiring the latest calibration information held by the printing apparatus, and storing the acquired latest calibration information;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. A rate of change calculation means;
A calculation means for calculating a value obtained by dividing a preset reference change amount by an average change rate of the past N (N is an arbitrary integer) times calculated by the change rate calculation means;
Setting means for setting the value calculated by the calculating means as an output sheet number indicating the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration Job dividing means for sequentially transferring the plurality of divided jobs to the printing device;
Calibration means for updating the correction data based on the latest calibration information each time the plurality of divided jobs are sequentially transferred to the printing apparatus by the job dividing means;
Print data correction means for correcting print data of the divided job based on the correction data updated by the calibration means;
It is characterized by having.

<Printing method>
The printing method according to the present invention includes:
A printing method performed by an information processing apparatus that transmits print data corrected by correction data to a printing apparatus and performs printing processing based on the print data in the printing apparatus,
A storage step of acquiring the latest calibration information held by the printing apparatus and storing the acquired latest calibration information in a storage unit;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. Change rate calculation step;
A calculation step of calculating a value obtained by dividing a reference change amount set in advance by an average change rate of the past N (N is an arbitrary integer) calculated by the change rate calculation step;
A setting step of setting the value calculated in the calculation step as an output number representing the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration A job dividing step of sequentially transferring the divided jobs to the printing apparatus;
A calibration step of updating the correction data based on the latest calibration information each time the divided jobs are sequentially transferred to the printing apparatus by the job dividing step;
A print data correction step of correcting the print data of the divided job based on the correction data updated by the calibration step;
It is characterized by having.

<Print program>
A printing program according to the present invention includes:
A print program that transmits print data corrected by correction data to a printing apparatus and that is executed by a computer of an information processing apparatus that performs print processing based on the print data in the printing apparatus,
A storage process for acquiring the latest calibration information held by the printing apparatus and storing the acquired latest calibration information in a storage unit;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. Change rate calculation processing,
A calculation process for calculating a value obtained by dividing a preset reference change amount by an average change rate of the past N (N is an arbitrary integer) times calculated by the change rate calculation process;
A setting process for setting the value calculated by the calculation process as an output sheet number indicating the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration Job division processing for sequentially transferring the divided jobs to the printing apparatus;
A calibration process for updating the correction data based on the latest calibration information each time the plurality of divided jobs are sequentially transferred to the printing apparatus by the job division process;
A print data correction process for correcting the print data of the divided job based on the correction data updated by the calibration process;
Is executed by the computer.

  <Recording medium>
  The recording medium according to the present invention is
  It is recorded on a computer-readable recording medium on which the printing program described above is recorded.

  According to the present invention, a print job to be transferred from the information processing apparatus (10) to the printing apparatus (20) is divided into a plurality of divided jobs and sequentially transferred, and the latest calibration information is updated every time the divided jobs are transferred. Since correction data is calibrated using the same, when a print job prints (copies) a large amount of the same data, calibration can be performed for each divided job during the printing. As a result, it is possible to prevent the print quality from deteriorating even when the same data is printed in large quantities.

  The present invention relates to a change amount calculating means for calculating a change amount from the latest calibration information and past calibration information held by a printer in an information processing system that performs print processing in a printer connected to a host device, and A print amount determination unit that determines a print amount for dividing a job from the calculated change amount, and a print job including print data is divided into a plurality of divided jobs based on the print amount, and the plurality of divided jobs are divided from the host device side. A job dividing unit that sequentially transfers to the printer side, a calibration unit that updates correction data based on the latest calibration information held by the printer each time a plurality of divided jobs are sequentially transferred by the job dividing unit, Based on the correction data updated by the calibration means, the print data of the divided job is displayed. A print data correction means for correcting is characterized in that it has a.

  According to another aspect of the present invention, there is provided a printing method for performing printing in a printer connected to a host apparatus based on print data corrected by correction data, wherein a print job including the print data is based on a predetermined print amount in the printing apparatus. Divide into multiple divided jobs, transfer the divided jobs sequentially from the host device side to the printer side, and make corrections based on the latest calibration information held by the printer each time the divided jobs are transferred sequentially In the printing method, the data is updated, the print data of the divided job is corrected based on the updated correction data, and the divided job is printed based on the corrected print data. A step of calculating a change amount and determining a print amount for dividing the job from the change amount is performed.

  Furthermore, the present invention is an image processing method used in an image processing unit that performs color correction on image data in accordance with preset color correction conditions and outputs the image data to an image output unit. Enter the status information, set the calibration execution timing based on the status information, let the image output unit perform calibration processing at the set execution timing, input the calibration processing result from the image processing unit, A color correction condition is set.

  As described above, according to the present invention, the optimum print amount for dividing the print job is automatically determined based on the calibration information, and the print job to be transferred from the host device to the printer is divided into a plurality of divided jobs according to the print amount. Since the correction data is calibrated using the latest calibration information every time this divided job is transferred, if the print job prints (copies) a large amount of the same data, Calibration can be automatically performed for each divided job during the printing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, a system configuration of an information processing system according to the present invention will be described with reference to FIG.

  The information processing system in the present embodiment is configured by connecting a host device (10) and a printer (20).

  The host device (10) is implemented as a personal computer, and includes a control unit (1010), a connection unit (1020), a storage unit (1030), a display unit (1040), and a medium reading unit. (1050), a recording medium (1060), and an input unit (1070).

  The control unit (1010) has a CPU and executes processing in the host device (10). The control unit (1011), the change amount calculation unit (1012), the division amount determination unit (1013), and , And is configured. The change amount calculation unit (1012) calculates a change rate from the calibration information. The division amount determination unit (1013) determines a print amount for dividing the print job from the change rate.

  The connection unit (1020) is an interface for connecting to the printer (20). The storage unit (1030) stores data in the process execution of the control unit (1010) or is used as a work area, and includes a RAM, a ROM, and a disk device. Yes. The display unit (1040) is a display unit having a CRT or the like. The medium reading unit (1050) is for reading data stored in the recording medium (1060). The recording medium (1060) is a floppy (R) disk or the like for recording various information. The input unit (1070) is an input unit having a keyboard or the like.

  The printer (20) is implemented as an electrophotographic printing apparatus using a laser beam, and includes a control unit (2010), a connection unit (2020), a storage unit (2030), and a printing unit (2040). ) And a concentration measuring unit (2050).

  The control unit (2010) has a CPU and executes processing in the printer (20). The connection unit (2020) is an interface for connecting to the host device (10). The storage unit (2030) stores data in the process execution of the control unit (2010) and is used as a work area, and includes a RAM, a ROM, and a disk device. Yes. The printing unit (2040) prints image data. The photosensitive drum, a laser beam system for forming a latent image on the photosensitive drum, and toner of each color are applied to the latent image formed on the photosensitive drum. And a transfer unit for transferring the toner image on the photosensitive drum to the printing paper. The density measurement unit (2040) is for obtaining the actual density value of the printer used as calibration information, and is provided in the printing unit (2040).

  The density measuring unit (2050) has a reading sensor for measuring the density of the toner image formed on the photosensitive drum or the intermediate transfer member. When creating calibration information using the density measurement unit (2050), first, for each color of yellow, magenta, cyan, and black toners on the photosensitive drum by the laser beam system, a predetermined number of density steps are provided. An electrostatic latent image is formed by the patch image, and toner is applied to the electrostatic latent image by the formed patch image to form a toner image. Then, by reading the toner image with the reading sensor provided in the density measuring unit (2050), it is possible to acquire the actual density value for each color of each toner shown in FIG. .

  Information and data exchange between the host device (10) and the printer (20) is performed via the connection unit (1020) and the connection unit (2020).

  The printer (20) creates calibration information at a predetermined timing, holds it in the RAM of the storage unit (2030) of the printer (20), and requests from the host device (10) used for print data correction processing. Will provide calibration information. Note that the timing of creating calibration information in the printer (20) is uniquely determined in the printer (20). When the printer (20) is turned on, a predetermined number of sheets, for example, 50 sheets or 100 sheets, is set. The RAM provided in the storage unit (2030) includes the latest calibration information created at these timings or the previous calibration information each time printing is performed, and further, at the time of replacement of toner or the like. Is held in.

  The calibration information is created by operating the printing unit (2040) to form a toner image of a predetermined patch on the photosensitive drum or the intermediate transfer member, and using the formed toner image as a density measuring unit (2050). As shown in FIG. 2, the reading is performed by obtaining the actual density values of k levels (5 levels in this embodiment) for each output color.

  On the other hand, execution timing information as shown in FIG. 2 is stored in the RAM of the storage unit (1030) of the host device (10). Note that the execution timing information is information suggesting at which timing calibration should be performed on the printer (20) connected to the host device (10) on the host device (10) side, and is a print job. A value calculated by the division amount determination unit (1013) is set for each time.

  The hard disk device included in the storage unit (1030) of the host device (10) stores a module related to the processing operation shown in FIG. 3 to be described later, and this module is activated by the host device (10). At this point, the program is read into the RAM of the storage unit (1030) of the host device (10) and executed. In addition to this, it is also possible to load and execute the above-described modules and related data on the host device (10) via the medium reading unit (1050) of the host device (10).

  For example, the module and related data are stored in the recording medium (1060) shown in FIG. 4, and the data content stored in the recording medium (1060) is configured as shown in FIG. To do. 5 includes at least volume information (12010), directory information (12020), a printing method module execution file (12030), a printing method module data file (12040), and so on. It is configured.

  The module realizing the processing procedure of this example and the related data stored in the recording medium (1060) shown in FIG. 4 are sent via the medium reading unit (1050) shown in FIG. 4 to the host device (10). Will be loaded. That is, when the recording medium (1060) is set in the medium reading unit (1050) of the host device (10), the module and related data are recorded on the recording medium (based on the control of the OS and the basic I / O program). 1060) and loaded into the RAM of the storage unit (1030) of the host device (10) to be operable. FIG. 6 suggests a memory map in a state where the module is loaded into the RAM of the storage unit (1030) of the host device (10) and becomes operable. The memory map shown in FIG. 6 includes a basic I / O module (11010), an OS (11020), a printing method module (11030), related data (11040), and a work area (11050). It is configured.

  Further, the module according to the processing procedure of the present embodiment stored in the recording medium (1060) shown in FIG. 4 and the related data are temporarily stored in the disk device or the like that is included in the storage unit (1030) of the host device (10). The module stored in the disk device and the related data are loaded from the disk device or the like included in the storage unit (1030) into the RAM included in the storage unit (1030). It is also possible to do so.

  Note that the modules described above in the present embodiment are program-coded based on the flowchart shown in FIG.

  Note that printing processing based on the configuration of this embodiment, particularly calibration, will be described below with reference to the flowchart shown in FIG.

  First, the control unit (1010) of the host device (10) receives a print request from the application by starting the print process, and starts a process for executing the print process (step S1). In this embodiment, when the control unit (1010) of the host device (10) starts processing for executing print processing, one page of print data as shown in FIG. 2 from the OS or application. (900 print data to be output) is acquired and temporarily stored in a disk device included in the storage unit (1030). It is also possible to acquire print data sequentially from the OS or application at a required time.

  Next, the control unit (1010) of the host apparatus (10) sends the latest calibration information to the control unit (2010) of the printer (20) via the connection unit (1020) and the connection unit (2020). An inquiry is made (step S2). In response to this inquiry, the control unit (2010) of the printer device (20) is created at a predetermined timing based on a predetermined number of sheets set in advance and stored in the RAM provided in the storage unit (2030) of the printer (20). The latest calibration information (see FIG. 2) is acquired, and the acquired calibration information is sent back to the control unit (1010) of the host device (10). Then, the control unit (1010) of the host device (10) stores the calibration information acquired from the printer (20) side in the RAM included in the storage unit (1030) in the data format as shown in FIG. Become. The stored calibration information indicates a history of the printer status from the past to the present.

  7 includes a theoretical density value and an actual density value in a so-called γ correction curve, and the theoretical density values are 10% (ID: I1), 30% (ID: I2), 50% ( Five concentration points for ID: I3), 70% (ID: I4) and 100% (ID: I5) are taken as measurement points. That is, as described above, the printer (20) outputs patches for these five density points and measures the density of the output batch to obtain the corresponding actual density value. Note that it is possible to change the position of the measurement point or use calibration information in which the number of measurement points is increased or decreased according to the characteristics of the printer (20). In addition, the information on the number of output sheets from the previous calibration to the latest calibration is added to the calibration information together with the density information.

  It should be noted that the calibration information generation on the printer (20) side is set in advance so as to be performed every time 50 sheets are printed, while the calibration execution timing determined on the host device (10) side is the above-described timing. Thus, when there are 200 sheets, the calibration is executed when the printer (20) side is inquired of the calibration information in this step at the execution timing determined on the host device (10) side. That is, the calibration is executed not at the calibration timing on the printer (20) side but at the calibration timing set on the host device (10) side. That is, the most appropriate timing calibration can be executed.

  Next, the change amount calculation unit (1012) calculates the change rate of the actual density value from the previous calibration point based on the history information stored in the RAM included in the storage unit (1030). It will be saved in the data format shown below. (Step 3). For example, the value X01 of the change rate table in FIG. 8 is obtained by dividing the deviation (D01−D11) between the latest actual density value and the previous actual density value by the number of output sheets M01 from the previous calibration. It is calculated by doing.

  Next, the division amount determining unit (1013) calculates an average change rate Xave based on the past N change rate data shown in FIG. The division amount determination unit (1013) sets a value obtained by dividing the reference change amount R stored in the preset RAM by the average change rate Xave in the RAM as execution timing information shown in FIG. Step S4). For example, when the average change rate is 0.001 and the reference change amount is 0.2, the execution timing is set to 200 (see FIG. 2). As a matter of course, when the printer (20) is new and the output is stable, the rate of change is small, and a large value is set for the number of output sheets representing the calibration execution timing. Conversely, when the printer (20) becomes obsolete and the output becomes unstable, the execution timing is set short.

  Thus, according to the present embodiment, the calibration execution timing is appropriately set according to the output stability of the printer (20). In the case where the distribution of change rates in the past N times deviates significantly from the normal distribution, a median value may be taken instead of an average value.

  Further, the division amount determination unit (1013) calculates the average change rate Xave based on the past N change rate data shown in FIG. 8, but the maximum change rate can also be used. . By using this maximum rate of change, the calibration execution timing is set short, so that an output image having a stable quality can be obtained. The past N times includes N = 1, and it is also possible to determine the division amount only from the latest rate of change.

  Next, the print data stored in the disk device included in the storage unit (1030) is checked, information on the number of output sheets is acquired, and the acquired information on the number of output sheets is stored in the RAM included in the storage unit (1030). (Step S5). In the present embodiment, as shown in FIG. 2, the number of output sheets in the print data is 900 sheets.

  Next, based on the above processing, the control unit (1010) creates the job division table shown in FIG. 2 from the information on the number of output sheets stored in the RAM and the information on the number of execution times, and the created job division table. The table is stored in the RAM included in the storage unit (1030) (step S6).

  FIG. 9 shows a configuration example of the job division table. The job division table in FIG. 9 suggests a table created based on information on the number of output sheets = 900 sheets and the number of sheets indicating execution timing = 200 sheets. That is, first, the job is divided into five, and the calibration is performed from the first job (job No. 1 in FIG. 9) to the fourth job (job No. 4 in FIG. 9). Set 200 copies, which means the number of copies. In the fifth job (job No. 5 in FIG. 9), the remaining 100 sheets are set.

  Next, the control unit (1030) sets an initial value 1 to a counter n for counting the number of jobs when printing processing is performed later (step S7), and the value of n reaches the number of divided jobs. 9 is set to K used to determine whether or not the job has been done, and is stored in the RAM of the storage unit (1030) (step S8).

  Next, the control unit (1030) compares K and n described above to determine whether or not the content of the counter n has reached 5 which is the content of K (step S9), and the control unit (1030). 2 is not reached (step S9 / NO), the control unit (1010) performs the divided print job indicated by the contents of n as shown in FIG. The latest calibration information stored in () is checked, and the latest correction table is created and stored in the RAM of the storage unit (1030).

  FIG. 10 shows a γ curve representing the relationship between the theoretical density value and the actual density value of the printer. Normally, the density value sent from the host device (10) to the printer (20), that is, the theoretical density value and the actual density value when a visible image is formed by the printer (20) do not exactly match. This difference in density value is further increased due to environmental changes and electrical and mechanical factors. The actual density curve varies depending on the printer (20), and also varies depending on the usage environment and usage status.

  FIG. 10 shows three types (Case 1 to 3) of actual density curves, and the calibration information shown in FIG. In FIG. 10, the horizontal axis indicates the theoretical density value, that is, the density value of the print input in the printer (20), and the vertical axis indicates the actual density value based on the output. In the case of the present embodiment, the curve in which the actual density value is plotted against the theoretical density value is a convex curve, and the actual density tends to increase in the intermediate density portion of the visible image with respect to the theoretical density value. It has become. In order to correct this to an ideal density straight line, that is, an upper right straight line with an inclination of 45 degrees, the theoretical density value is corrected with a value represented by a concave curve. In FIG. 10, a correction curve represented by a concave curve is a correction curve for the actual density curve of Case 2. The relationship of the correction curve (γ curve) is stored in the RAM as a correction table.

  FIG. 8 is a schematic diagram showing a correction table stored in the RAM. When the theoretical density value is output from the host device (10), the density value actually formed by the printer (20) is the input density value, which is the actual density value. Then, the density correction value is obtained by dividing the theoretical density value by the input density value.

  Next, the control unit (1010) creates a print job (binarized data) using the correction table stored in the RAM included in the storage unit (1030) and the print data, and stores the data in the storage unit (1030). It is stored in the RAM provided (step S11). At this point, a print job (job No. n, initially n = 1) for one page, which is drawing data for obtaining an output as shown in FIG. 14, is created.

  Further, the control unit (1010) refers to the job division table shown in FIG. Is information of n (initially n = 1). Then, the control unit (1010) converts the number information into a format meaning the number of copies in the PDL, and the converted information is stored in the storage unit (1030). This is added to the print job of n (initially n = 1) and stored in the storage unit (1030) (step S12). As a result, the job number in the job division table shown in FIG. Since the number information of n (n = 1) is 200, 200 copies are set as the number of copies. At this point, the print job n shown in FIG. 2 (initially n = 1, the first sheet to the 200th sheet) is created.

  Next, the control unit (1010) transmits the print job n stored in the storage unit (1030) to the connection unit (1020) and the control unit (2010) of the printer (20) via the connection unit (2020). (Step S13). As a result, the control unit (2010) of the printer (20) executes a print job and performs printing to output 200 identical data. In this case, since these 200 sheets have been calibrated when setting the print job, they are all output with the same quality without quality deterioration.

  Thereafter, the control unit (1010) adds 1 to n (step S14), returns to the process of step S9, and repeats the subsequent processes until n becomes larger than the value 5 of K. As a result, print job 5 (job No. 5 in the job division table in FIG. 9) is generated from print job 2 (job No. 2 in the job division table in FIG. 9) shown in FIG. 2, and is generated in the printer (20). The data is transferred and printing processing is performed. Finally, as shown in FIG. 13, the print quality does not change from the output of the first sheet to the output of the 900th sheet, and an output of the same quality can be obtained.

  On the other hand, if n = 6 and it is determined in step S9 that it is greater than K (step S9 / YES), the control unit (1010) ends the process.

  As described above, the information processing system of this embodiment can perform calibration at an appropriate timing. In particular, a print job to be transferred from the host device (10) to the printer (20) is divided into a plurality of divided jobs and sequentially transferred, and the correction data is updated using the latest calibration information for each divided job transfer. Since calibration is performed, when a print job prints (copies) a large amount of the same data, it is possible to perform calibration for each divided job during the printing. As a result, it is possible to prevent the print quality from deteriorating even when the same data is printed in large quantities.

Next, a second embodiment will be described.
The second embodiment relates to the calculation of the rate of change when determining the calibration execution timing.

  When calibration is executed, the calibration information shown in FIG. 7 is acquired for each color material. However, if the calibration is performed independently for each color material, the output throughput is reduced. Therefore, the print amount for determining the calibration execution timing is calculated from the change rate table corresponding to FIG. 8 calculated for each color material, and the average print amount or the minimum print amount is used to give the calibration execution timing. Let's assume the amount. Further, a weighted average value calculated by adding a weight to the print amount calculated by the color material is used as the print amount. For example, when the frequency of monochrome output is high, the calibration timing at which the image quality of the K plate is stabilized is set by increasing the weight for the printing amount calculated for the K plate.

  Furthermore, it is possible to weight the change rate of the density value of different patches measured for each color material, and as a result, to determine the printing amount for each color material. At this time, it is possible to further weight the print amount calculated for each color material, and it is also possible to simply determine the print amount to be calibrated based on the average value or the maximum value.

  In this way, by making the weight for the change rate different for each density level, for example, it is possible to increase the weight for the output density change in the highlight portion. That is, it is possible to set the calibration timing in consideration of the difference in the influence on the image quality due to the density level.

Next, a third embodiment will be described.
The third embodiment relates to a print job obtained by converting print data into PDL. In other words, depending on the printer model, there are printers that process one print job and cannot perform calibration. For example, when the host device (10) outputs print data, the control unit (2010) cannot execute calibration until one job (for example, output of 900 sheets) is completed even if the state of the printer (20) changes. . For this reason, even though the control unit (2010) of the printer (20) has a calibration function, it may not be used effectively and quality degradation may occur.

  Therefore, when a print job in which print data is converted to PDL is transmitted to the printer (20), it is possible to avoid quality degradation by dividing the job based on a predetermined condition. In this case as well, it is possible to set the print amount for dividing the job to an appropriate value from the amount of change in the past calibration information without bothering the user.

  Specifically, instead of steps S10 and S11 shown in FIG. 3, a process for converting print data into PDL data (drawing data) is provided. In this case, in the case shown in FIG. 2, print job 1 to print job 5, which are each one job described in PDL, are sequentially transferred to the printer (20). Then, when the processing of the print job 1 is completed, the control unit (2010) of the printer (20) executes the calibration, and then performs the processing of the print job 2. Thereby, since calibration is always executed before the print job, it is possible to maintain the output quality even when the print job converted to PDL is transmitted to the printer (20).

  The above-described embodiments are preferred embodiments of the present invention, and various modifications can be made without departing from the scope of the present invention. For example, what was described as an example in the said Example is applicable to what is specifically shown below.

  That is, the printer (20) can also be applied to a plotter, a copier, a FAX, or the like. The host device (10) can also be applied to a personal computer, a workstation, a minicomputer, or the like. The control units (1010, 2010) can also be applied to software, ROM, RAM, or the like. The connection units (1020, 2020) can also be applied to a serial interface board, a parallel interface board, a network interface board, and the like. The storage units (1030, 2030) can also be applied to memories, magnetic disk devices, magneto-optical disk devices, magnetic tape devices, and the like. The printing unit (2040) can also be applied to a laser beam method, a bubble jet (R) method, an LED method, a thermal transfer method, or the like. The display unit (1040) can also be applied to a CRT, a liquid crystal, or the like. The input unit (1070) can also be applied to a keyboard, a mouse, a trackball, or the like. The medium reading unit (1050) can also be applied to an FD device, an MO device, a CD-ROM device, an IC memory card device, or the like. Further, the recording medium (1060) is applicable to FD, MO, CD-ROM, IC memory card, and the like.

  Further, as described above, even if the present invention is applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), it can be realized from a single device (for example, a copying machine, a facsimile machine). It is also possible to apply to the device.

  The calibration information has been described as the density information on the photosensitive member or the intermediate transfer body, but the present invention is applied to a printing apparatus having a measurement unit that forms an image on a recording medium such as paper and measures the density information of the output image. It is also possible. In this case, output by the output medium is performed for each calibration, but highly accurate calibration is possible. Further, a program code of software for realizing the functions of the above-described embodiment in an apparatus or a computer in the system connected to the various devices so as to operate the various devices so as to realize the functions of the above-described embodiments. Can be implemented by operating the various devices according to a program stored in a computer (CPU or MPU) of the system or apparatus.

  In this case, the program code of the software itself realizes the functions of the above-described embodiments, and the program code itself and means for supplying the program code to the computer, for example, the program code are stored. This recording medium can be constructed in the present embodiment.

  As a recording medium for storing the program code, for example, a floppy (R) disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used. is there.

  Further, by executing the program code supplied by the computer, not only the functions of the above-described embodiments are realized, but also the OS (Operating System) or other application in which the program code is running on the computer. It goes without saying that the program code is also included in the embodiment of the present invention even when the processing operation of the above-described embodiment is realized in cooperation with software or the like.

  Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU provided in the function expansion board or function storage unit based on the instruction of the program code Needless to say, the present invention includes a case where the processing operation of the above-described embodiment is realized by performing part or all of the actual processing.

  The present invention is applicable to a device that performs calibration.

It is a block diagram which shows the structure of the information processing system concerning this invention. FIG. 6 is a diagram for explaining calibration and print job creation in an embodiment of the present invention. It is a flowchart which shows the calibration which is printing control in one Example of this invention. It is a figure which shows the example at the time of loading the information of a recording medium to a host apparatus. It is a figure which shows the structure of the data content stored in a recording medium. It is a figure which suggests the memory map of the state where the module was loaded in the memory | storage part of the host apparatus, and became operable. It is a figure which shows the data format of calibration information. It is a figure which shows the data format of a change rate table. It is a figure which shows the structural example of a job division | segmentation table. It is a figure which shows the relationship between a theoretical density value and the actual density value of a printer. It is a conceptual diagram for showing bidirectional communication between a host device and a printer. It is a conceptual diagram for demonstrating the conventional calibration and creation of a print job. It is a figure which shows the example of an output in which quality degradation does not arise when printing is performed. It is a figure which shows the example of an output which quality degradation produced when printing was performed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Host apparatus 20 Printer 1010, 1011, 2010 Control part 1012 Change amount calculation part 1013 Division | segmentation amount determination part 1020, 2020 Connection part 1030, 2030 Storage part 1040 Display part 1050 Medium reading part 1060 Recording medium 1070 Input part 2040 Printing part 2050 Density Measurement unit

Claims (11)

An information processing apparatus that transmits print data corrected by correction data to a printing apparatus, and performs printing processing based on the print data in the printing apparatus,
Storage means for acquiring the latest calibration information held by the printing apparatus, and storing the acquired latest calibration information;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. A rate of change calculation means;
A calculation means for calculating a value obtained by dividing a preset reference change amount by an average change rate of the past N (N is an arbitrary integer) times calculated by the change rate calculation means;
Setting means for setting the value calculated by the calculating means as an output sheet number indicating the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration Job dividing means for sequentially transferring the plurality of divided jobs to the printing device;
Calibration means for updating the correction data based on the latest calibration information each time the plurality of divided jobs are sequentially transferred to the printing apparatus by the job dividing means;
Print data correction means for correcting print data of the divided job based on the correction data updated by the calibration means;
An information processing apparatus comprising: The rate of change calculation means includes:
The change rate in the past N times (N is an arbitrary integer) calibration is held, and the change rate used for calculating the value is calculated based on the N times change rate. 1. An information processing apparatus according to 1. The print data corrected by the print data correction means is
The information processing apparatus according to claim 1, wherein the information processing apparatus is included in a plurality of divided jobs transferred to the printing apparatus by the job dividing unit.   The information processing apparatus according to claim 1, wherein the calibration unit and the print data correction unit function in the printing apparatus. The calibration information is
The information includes at least an actual density value obtained by measuring a result printed based on a theoretical density value in the printing apparatus and an output number counted from a predetermined time point by the printing apparatus. The information processing apparatus according to claim 1. The correction data is
The information processing apparatus according to claim 1, wherein the information processing apparatus is data in which a theoretical density value is associated with a correction amount of the theoretical density value. The rate of change in the calibration is
3. The information processing apparatus according to claim 2 , wherein a change rate of calibration information calculated for each different color material is multiplied by a coefficient value set for each color material. An information processing apparatus having an information processing apparatus and a printing apparatus, wherein the information processing apparatus transmits print data corrected by correction data to the printing apparatus, and performs printing processing based on the print data in the printing apparatus A system,
The information processing apparatus includes:
Storage means for acquiring the latest calibration information held by the printing apparatus, and storing the acquired latest calibration information;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. A rate of change calculation means;
A calculation means for calculating a value obtained by dividing a preset reference change amount by an average change rate of the past N (N is an arbitrary integer) times calculated by the change rate calculation means;
Setting means for setting the value calculated by the calculating means as an output sheet number indicating the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration Job dividing means for sequentially transferring the plurality of divided jobs to the printing device;
Calibration means for updating the correction data based on the latest calibration information each time the plurality of divided jobs are sequentially transferred to the printing apparatus by the job dividing means;
Print data correction means for correcting print data of the divided job based on the correction data updated by the calibration means;
An information processing system comprising: A printing method performed by an information processing apparatus that transmits print data corrected by correction data to a printing apparatus and performs printing processing based on the print data in the printing apparatus,
A storage step of acquiring the latest calibration information held by the printing apparatus and storing the acquired latest calibration information in a storage unit;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. Change rate calculation step;
A calculation step of calculating a value obtained by dividing a reference change amount set in advance by an average change rate of the past N (N is an arbitrary integer) calculated by the change rate calculation step;
A setting step of setting the value calculated in the calculation step as an output number representing the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration A job dividing step of sequentially transferring the divided jobs to the printing apparatus;
A calibration step of updating the correction data based on the latest calibration information each time the divided jobs are sequentially transferred to the printing apparatus by the job dividing step;
A print data correction step of correcting the print data of the divided job based on the correction data updated by the calibration step;
A printing method characterized by comprising: A print program that transmits print data corrected by correction data to a printing apparatus and that is executed by a computer of an information processing apparatus that performs print processing based on the print data in the printing apparatus,
A storage process for acquiring the latest calibration information held by the printing apparatus and storing the acquired latest calibration information in a storage unit;
Based on the latest calibration information stored in the storage unit and the past calibration information stored in the storage unit, the change rate of the actual density value from the previous calibration point is calculated. Change rate calculation processing,
A calculation process for calculating a value obtained by dividing a preset reference change amount by an average change rate of the past N (N is an arbitrary integer) times calculated by the change rate calculation process;
A setting process for setting the value calculated by the calculation process as an output sheet number indicating the execution timing of calibration;
Dividing the number of output sheets of the print data, and an output number representing the execution timing of the calibration based on the number of output sheets of the print data, into a plurality of divided jobs output number unit indicating the execution timing of the calibration Job division processing for sequentially transferring the divided jobs to the printing apparatus;
A calibration process for updating the correction data based on the latest calibration information each time the plurality of divided jobs are sequentially transferred to the printing apparatus by the job division process;
A print data correction process for correcting the print data of the divided job based on the correction data updated by the calibration process;
Is executed by the computer. A computer-readable recording medium on which the printing program according to claim 10 is recorded.

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