CN117956098A

CN117956098A - Color correction method and device and electronic equipment

Info

Publication number: CN117956098A
Application number: CN202311756346.XA
Authority: CN
Inventors: 殷垒; 龚海飞
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Zhuhai Pantum Electronics Co Ltd
Priority date: 2023-12-19
Filing date: 2023-12-19
Publication date: 2024-04-30

Abstract

The present application relates to the field of image forming technologies, and in particular, to a color correction method and apparatus, and an electronic device. A color correction method comprising: detecting whether the image forming device meets a preset color correction triggering condition; when the preset color correction triggering condition is met, determining a target color correction mode corresponding to the met preset color correction triggering condition; color correction is performed on the image forming apparatus based on the target color correction pattern.

Description

Color correction method and device and electronic equipment

Technical Field

The present application relates to the field of image forming technologies, and in particular, to a color correction method and apparatus, and an electronic device.

Background

In executing a print job using an image forming apparatus, color correction needs to be performed in good time to ensure image formation quality. However, when performing color correction, since different functional modules perform correction at different frequencies required in different scenes, performing color correction on the image forming apparatus using a single frequency increases the frequency of performing the low frequency module, increasing the number of color correction triggers and the amount of powder consumed.

Disclosure of Invention

The embodiment of the invention provides a color correction method, a color correction device and electronic equipment, which are used for solving the problem that correction frequencies of different functional modules cannot be distinguished in the prior art.

In a first aspect, the present application provides a color correction method applied to an image forming apparatus, including:

detecting whether the image forming device meets a preset color correction triggering condition;

When the preset color correction triggering condition is met, determining a target color correction mode corresponding to the met preset color correction triggering condition;

color correction is performed on the image forming apparatus based on the target color correction pattern.

Optionally, the detecting whether the image forming apparatus meets a preset color correction triggering condition includes:

after the image forming device is started, detecting whether the image forming device meets a preset color correction triggering condition or not; and/or the number of the groups of groups,

Detecting whether the image forming device meets a preset color correction triggering condition after the image forming device is awakened from a dormant state; and/or the number of the groups of groups,

During execution of a print job by the image forming apparatus, it is detected whether the image forming apparatus satisfies a preset color correction trigger condition.

Detecting whether the environment where the image forming device is located meets the preset color correction triggering condition; and/or the number of the groups of groups,

Detecting whether the number of printing pages of the image forming device meets the preset color correction triggering condition; and/or the number of the groups of groups,

Detecting whether an imaging component of the image forming device meets the preset color correction triggering condition; and/or

Detecting whether the temperature change of a laser scanning unit of the image forming device meets the preset color correction triggering condition.

Optionally, the detecting whether the image forming apparatus meets a preset color correction triggering condition specifically includes: detecting the environment in which the image forming device is located;

when triggering to execute detection on the image forming equipment, determining whether the temperature and the humidity of the image forming equipment reach a preset threshold value or not; and/or the number of the groups of groups,

When triggering to execute detection on the image forming equipment, determining whether the change value of the environmental temperature and the humidity of the image forming equipment reaches a preset threshold value or not after the image forming equipment executes color correction last time;

and when the temperature and the humidity reach a preset threshold value or the variation value of the temperature and the humidity reach a preset threshold value, determining that the image forming equipment meets the preset color correction triggering condition.

Optionally, the determining whether the temperature and the humidity of the image forming apparatus reach preset thresholds includes:

After the image forming device is started, when the temperature and the humidity of the image forming device reach a preset first temperature and humidity threshold value, the image forming device is determined to meet a preset second color correction triggering condition.

Optionally, the determining whether the change value of the environmental temperature and the humidity reaches the preset threshold value after the image forming apparatus performs the color correction last time includes:

When the change value of the ambient temperature and the humidity of the image forming equipment exceeds a preset second temperature and humidity threshold value, determining that the image forming equipment meets a preset first color correction triggering condition;

and when the change value of the ambient temperature and the humidity of the image forming equipment exceeds a preset third temperature and humidity threshold value, determining that the image forming equipment meets a preset second color correction triggering condition.

Optionally, the detecting whether the image forming apparatus meets a preset color correction triggering condition specifically includes: acquiring printing page number information of the image forming device;

Determining whether the accumulated number of printing pages reaches a preset threshold value since the image forming apparatus last executed color correction;

when the threshold value is reached, the image forming device is determined to meet the preset color correction triggering condition.

Optionally, when the threshold is reached, determining that the image forming apparatus meets the preset color correction triggering condition includes:

when the number of printing pages of the image forming device reaches a first page number threshold value, determining that the image forming device meets a preset first color correction triggering condition;

When the number of printing pages of the image forming device reaches a second page number threshold value, determining that the image forming device meets a preset second color correction triggering condition;

when the number of printing pages of the image forming device reaches a third page number threshold value, determining that the image forming device meets a preset third color correction triggering condition;

Wherein the first page count threshold is greater than the second page count threshold, and the second page count threshold is greater than the third page count threshold.

Optionally, the detecting whether the image forming apparatus meets a preset color correction triggering condition specifically includes: detecting a temperature of a laser scanning unit of the image forming apparatus;

When triggering to execute detection on the image forming equipment, determining whether a temperature change value of a laser scanning unit installed on the image forming equipment reaches a preset threshold value;

and when the temperature change value of the laser scanning unit exceeds a preset fourth temperature and humidity threshold value, determining that the image forming equipment meets a preset third color correction triggering condition.

Optionally, the detecting whether the image forming apparatus meets a preset color correction triggering condition specifically includes: detecting an imaging component of the image forming device:

When the image forming apparatus is started, when one or more installed imaging components are detected to be newly installed components, the image forming apparatus is determined to meet a preset first color correction triggering condition.

Optionally, the detecting whether the image forming apparatus meets a preset color correction triggering condition further includes:

When the image forming apparatus is detected to be used for the first time after the image forming apparatus is started, it is determined that the image forming apparatus satisfies a preset first color correction triggering condition.

Optionally, the method further comprises:

When triggering execution of color correction in the process of executing a print job by the image forming device, determining whether the residual page number of the print job reaches a fourth page number threshold;

executing the color correction when the fourth page number threshold is reached, and continuing to execute the print job after the color correction is completed;

and when the fourth page number threshold is not reached, continuing to execute the printing task, and executing the color correction after completing the printing task.

Optionally, the performing color correction on the image forming apparatus based on the target color correction mode includes:

When a first color correction triggering condition is met, performing color correction on the image forming equipment through a first color correction mode, wherein the first color correction mode comprises performing carbon powder concentration sensor adjustment, performing concentration correction through Dmax correction, LD light intensity adjustment and long Gamma correction, and performing at least one of image position correction through long ACR correction;

When a second color correction triggering condition is satisfied, performing color correction on the image forming device through a second color correction mode, wherein the second color correction mode comprises performing carbon powder concentration sensor adjustment, performing concentration correction through Dmax correction, LD light intensity adjustment and short Gamma correction, and performing at least one of image position correction through short ACR correction;

And when a third color correction triggering condition is satisfied, performing color correction on the image forming apparatus through a third color correction mode, wherein the third color correction mode comprises performing carbon powder concentration sensor adjustment, and performing at least one of image position correction through short ACR correction.

Optionally, the method further comprises:

When a black-and-white printing instruction is received while performing color correction, suspending performing color correction and performing a black-and-white printing task;

And after the black-and-white printing task is completed, continuing to execute the color correction.

In a second aspect, the present application provides a color correction device applied to an image forming apparatus, the device comprising:

A detection module for detecting whether the image forming device meets a preset color correction triggering condition;

the determining module is used for determining a target color correction mode corresponding to the satisfied preset color correction triggering condition when the preset color correction triggering condition is satisfied;

a correction module that performs color correction on the image forming apparatus based on the target color correction pattern.

In a third aspect, the present application provides an electronic device, comprising:

at least one processor; and

At least one memory communicatively coupled to the processor, wherein:

The memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of the first aspects.

In a fourth aspect, the present application provides a storage medium comprising a stored program, wherein the program, when run, controls a device on which the storage medium is located to perform the method of any one of the first aspects.

The embodiment of the invention determines different color correction triggering conditions by detecting the environment of the image forming equipment, selects different color correction modes to execute color correction on the image forming equipment based on the different color correction triggering conditions, and solves the problem of poor image effect in the printing process of the image. The triggering times of color correction are reduced while the imaging effect meets the requirement in the use process of the image forming equipment, the powder consumption is reduced, and the use experience of a user is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an image forming apparatus according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an imaging device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an acquisition device according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an image forming apparatus according to an embodiment of the present invention;

FIG. 5 is a flowchart of a color correction method according to an embodiment of the present invention;

fig. 6 shows an example of a correction pattern used in Dmax correction according to an embodiment of the present invention;

fig. 7 shows an example of a correction pattern used in Dmax correction according to another embodiment of the present invention;

fig. 8 shows an example of a correction pattern used for LD light intensity adjustment according to an embodiment of the present invention;

fig. 9 shows an example of a correction pattern used for still another LD light intensity adjustment provided in an embodiment of the present invention;

FIG. 10 shows an example of 45-degree 1by3 diagonal color patches provided by an embodiment of the present invention;

FIG. 11 shows an example of a correction pattern used for the long Gamma correction according to the embodiment of the present invention;

FIG. 12 shows an example of a correction pattern used for short Gamma correction according to an embodiment of the present invention;

FIG. 13 is a flowchart of a method for obtaining a correction value of MHV by Dmax correction according to an embodiment of the present invention;

FIG. 14 is a timing diagram of the opening of MHV and DEV during the execution of Dmax correction according to an embodiment of the present invention;

Fig. 15 is a flowchart of a CTD sensor adjustment method according to an embodiment of the present invention;

fig. 16 is a flowchart of a method for adjusting LED light power by a CTD sensor according to an embodiment of the present invention;

fig. 17 is a flowchart of a CTD sensor detection method according to an embodiment of the present invention;

FIG. 18 is a logic diagram illustrating a P-channel determination according to an embodiment of the present invention;

fig. 19 is a schematic diagram of detection of a CTD sensor according to an embodiment of the present invention;

Fig. 20 is a flowchart showing a method for correcting LD light intensity according to an embodiment of the present invention;

Fig. 21 is a timing chart showing an LD light intensity correction according to an embodiment of the present invention;

Fig. 22 is a schematic structural diagram of a color correction device according to an embodiment of the present invention;

fig. 23 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

An image forming apparatus is an apparatus that prints images or characters on an image forming medium, such as a printer, a copier, a scanner, a facsimile machine, and the like. Since a color image forming apparatus has a plurality of image forming units and forms a multicolor image by forming images of respective colors using the image forming units and then transferring the images to an intermediate transfer member or a recording material in an overlapping manner, color shift of the plurality of colors easily occurs when forming the multicolor image, resulting in a mismatch in relative positions between the respective images formed by the image forming units, the image forming apparatus often needs to perform some color correction in order to secure the quality of image formation. Taking an image forming apparatus of four colors of toner of black, magenta, cyan, and yellow as an example, it is necessary to perform density detection, image positional deviation detection, and the like of the toner at the time of color correction. To ensure that the quality of the formed image meets the requirements.

As shown in fig. 1, a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention is provided. Referring to fig. 1, the image forming apparatus includes a processing part, an imaging device, an acquisition device, and a storage unit. The imaging device, the acquisition device and the storage unit are all electrically connected with the processing component. The process unit is a main control unit of the image forming apparatus for controlling the image forming apparatus, the collecting device, and the storage unit. The storage unit is used for storing program instructions for being executed by the processing component, and storing intermediate data required by the program instructions in the running process, data acquired by the sensor component and the like so as to be called by the processing component for running. The imaging device is used for imaging the job to be processed under the control of the processing component. As shown in fig. 2, the image forming apparatus mainly includes a developing assembly, an LSU (LASER SCANNING Unit, LSU, laser scanning Unit) assembly, an image carrier, and the like. The acquisition device is used for acquiring related data of the environment where the imaging equipment is located. As shown in fig. 3, the collecting device may include a CTD sensor (Counterpoint Density Sensor, para-concentration sensor, abbreviated as CTD sensor), a temperature and humidity sensor, and the like. The CTD sensor is used to detect a transferred image formed on an image carrier, which may be an intermediate transfer belt or a photosensitive drum. The temperature and humidity sensor is used for collecting the temperature and humidity of the current environment.

The specific distribution structures of the developing assembly, the LSU assembly, the image carrier, the CTD sensor, and the temperature and humidity sensor are shown in fig. 4.

The image forming apparatus provided in the image forming device includes the above-described developing assembly and image forming assembly, that is, the image forming assembly includes at least a developing roller, a charging roller, a photosensitive drum, and the like, and the color image forming device is generally provided with four image forming assemblies, that is, K (black), C (cyan), M (magenta), Y (yellow), and the developing assembly and the image forming assembly in the image forming apparatus may be provided as an integral structure or as a relatively independent structure.

Referring to fig. 1 to 4, the operation procedure of the image forming apparatus includes: the processing unit acquires a job to be processed, and converts the job to be processed into an image to be formed. The processing section controls the LSU to expose the photosensitive drum to which the uniform charge has been applied, in accordance with the image to be formed, to form an electrostatic latent image corresponding to the image to be formed on the photosensitive drum surface. Further, the process section controls the developing device to supply the developer to the electrostatic latent image to form a visible image on the photosensitive drum surface. As shown in fig. 4, Y, M, C and K are used to provide yellow, magenta, cyan, and black developers, respectively. The visible image formed on the surface of the photosensitive drum can be transferred onto the transfer belt. The image on the transfer belt is used for transfer to an imaging medium (e.g., paper) to thereby form an image on the imaging medium. Alternatively, the embodiment of the present invention also refers to an image formed on a photosensitive drum or a transfer belt as a transfer image.

In some examples, the image forming device includes a CTD sensor. As shown in fig. 4, the CTD sensor includes a left CTD sensor and a right CTD sensor. The left CTD sensor and the right CTD sensor are disposed on both sides of the transfer belt in the width direction of the transfer belt. The left CTD sensor and the right CTD sensor may detect the transferred image on the transfer belt when the image to be formed forms the transferred image on the transfer belt. The left CTD sensor and the right CTD sensor transmit the detection result to the processing section. Further, the image forming apparatus further includes a temperature and humidity sensor therein. As shown in fig. 4, a temperature and humidity sensor may be provided on the transfer belt or the LSU assembly for detecting the temperature and humidity of the environment. The temperature and humidity sensor transmits the acquired environmental temperature and humidity data to the processing component. The processing component may determine whether the timing of triggering the color correction is currently reached based on different conditions in combination with the ambient temperature and humidity, or the processing component may determine what color correction mode to use based on the ambient temperature and humidity.

Color correction generally includes various types such as ACR correction and density correction.

ACR (Auto Color Registration, automatic color registration): the color image forming apparatus prints a color image on a printing sheet using four colors of yellow, magenta, cyan, and black, and performs ACR so as to precisely register the color registration at a desired position on the printing sheet. The ACR work is to correct the relative positions where four colors are formed so that images of the four colors are precisely aligned, and when the ACR work is performed, image quality is improved, for example, a color image forming apparatus performs image formation using CMYK four colors, color registration is required before printing an image so that CMY is color registered with K colors, and if not aligned, for example, a green image is formed using yellow and cyan, the formed image is decomposed into two colors, and thus ACR correction is required. The ACR correction is divided into a long ACR correction and a short ACR correction by detecting the actual position of CMY relative to K to adjust the luminous delay, so that the image color effect is within the product specification, the correction effect is equivalent, the short ACR correction image length is shorter than the long ACR correction, and the correction time can be saved.

The density correction is mainly classified into Dmax correction, LD light intensity correction, gamma correction.

Dmax correction: the voltage value corresponding to the target color density value is detected, the voltage value is mainly the developing voltage, the charging voltage is adjusted according to the developing voltage, and the adjusted voltage value is used for enabling the image color density to be in the target specification range.

LD (Laser Diode) light intensity correction (i.e., LSU light power correction): the purpose is to correct the light power of the LSU (LASER SCANNING Unit, LSU, laser scanning Unit) so that the LSU is exposed with the appropriate light power. And detecting the LD power value corresponding to the target color density by detecting the color density value of each color block corresponding to the LD power. The regulated LD power is used to make the image point and line reproducibility good and the image fine. The purpose of the LD light intensity correction is also to ensure that the CMYK four-color 1dot dots and 1pixel thin lines can be printed normally.

Gamma correction: the Gamma curve of the image forming apparatus is adjusted to make the image tone reproducibility good. The Gamma correction is divided into long Gamma correction and short Gamma correction, the correction effect is equivalent, and the short Gamma correction can save correction time. When the color correction is carried out, CTD sensor adjustment is needed, and the background voltage of the specular reflection channel is adjusted to be near a fixed value by adjusting the LED optical power of the CTD sensor, so that the consistency of multiple corrections of multiple machines is ensured.

In addition, color correction is generally classified into correction for a color mode in which an ACR correction and density correction are required to be performed to correct the relative position at which an image is formed, and correction for a black-and-white mode in which density correction is also required to be performed to adjust the image density, since a color image is required to be formed.

However, since different devices or modules in the image forming apparatus perform color correction in different scenes at different frequencies, performing color correction on all images in the image forming apparatus using a single correction scheme increases the frequency of performing color correction by the low frequency module, increasing the number of times of color correction triggering and the amount of powder consumption.

In order to solve the above problems, as shown in fig. 5, a color correction method according to an embodiment of the present invention includes the following specific steps:

s501, it is detected whether the image forming apparatus satisfies a preset color correction trigger condition.

Specifically, after the image forming apparatus is started, after the image forming apparatus is awakened from a sleep state, and when the image forming apparatus is determined to be a time for detecting whether the image forming apparatus meets a preset color correction trigger condition in the process of executing a print job, the image forming apparatus is detected, and whether the image forming apparatus meets one or more of a plurality of preset color correction trigger conditions is detected.

It is to be understood that the color correction trigger condition may be detected during the period from when the image forming apparatus starts to enter the standby state after the end of warm-up, when the image forming apparatus wakes up from the sleep state to when the end of warm-up enters the standby state, and during execution of the print job, which the present invention is not limited in this respect.

Wherein, after the image forming apparatus is started, detection is performed every 10 seconds until the image forming apparatus stops after warm-up is completed; after the image forming apparatus resumes from the sleep mode, detection is performed every 10 seconds until stopping after lasting one minute; after the image forming apparatus receives the print command, detection is performed every 10 seconds until stopping after printing is completed. It will be appreciated that the detection may be performed once at 15 seconds, 20 seconds, 25 seconds, etc., as the invention is not limited in this regard.

In detecting specifically whether or not the color correction trigger condition is satisfied, it is necessary to detect whether or not one or more of the environment in which the image forming apparatus is located, the number of printed pages of the image forming apparatus, the image forming assembly of the image forming apparatus, and the temperature change of the laser scanning unit satisfies the color correction trigger condition, respectively.

S502, when the preset color correction triggering condition is met, determining a target color correction mode corresponding to the met preset color correction triggering condition.

Specifically, when one of a plurality of preset color correction trigger conditions is satisfied, the satisfied color correction trigger condition is determined as a target correction condition, and a color correction mode corresponding to the target correction condition is determined.

In a specific embodiment, a preset first color correction trigger condition, a preset second color correction trigger condition, and a preset third color correction trigger condition are provided. The preset first color correction triggering condition corresponds to a first color correction mode, the preset second color correction triggering condition corresponds to a second color correction mode, and the preset third color correction triggering condition corresponds to a third color correction mode.

Wherein, as shown in table 1, the first color correction mode includes performing density correction by Dmax correction, LD light intensity adjustment, long Gamma correction, and image position correction by long ACR correction; a second color correction mode including performing density correction by Dmax correction, LD light intensity adjustment, short Gamma correction, and image position correction by short ACR correction; and a third color correction mode including performing image position correction by short ACR correction. The first color correction mode has long correction time and high correction precision, is suitable for being used when the state change is large and the printing quantity is large, and is used for correcting the concentration and the position of an image; the second color correction mode has short correction time and low correction precision, is suitable for being used when the time is short, the powder consumption is low, the trigger frequency is low, and the correction is short and complete; the third color correction mode is short in time and less in powder consumption, and is used for correcting the position of an image only and is short in position correction.

In addition, the CTD adjustment is also included in different color correction modes and is used for adjusting the background voltage of the specular reflection channel to be near a fixed value by adjusting the light power of the LEDs of the CTD sensor so as to ensure the consistency of multiple corrections of multiple machines.

Table 1 (different color correction modes example one)

S503, color correction is performed on the image forming apparatus based on the target color correction mode.

Specifically, the image density, and the image position are corrected by the determined color correction pattern.

Wherein the first color correction mode has a higher priority than the second color correction mode, and the second color correction mode has a higher priority than the third color correction mode. When the image forming apparatus satisfies a plurality of color correction modes simultaneously, color correction is preferentially performed by the color correction mode with higher priority.

In some embodiments, detecting S501 whether the image forming apparatus satisfies a preset color correction trigger condition includes detecting an environment in which the image forming apparatus is located.

Specifically, when the detection is triggered, it is determined whether the temperature and the humidity of the environment where the image forming apparatus is located reach a preset threshold value, and whether the change value of the temperature and the humidity of the environment where the image forming apparatus is located since the last execution of the color correction reaches the preset threshold value is determined. When the threshold is reached, it is determined that the image forming apparatus satisfies a preset color correction triggering condition.

When the temperature and the humidity of the image forming equipment reach a preset first temperature and humidity threshold value after the image forming equipment is started, the image forming equipment is determined to meet a preset second color correction triggering condition. In general, the first temperature and humidity threshold is set to 30 ℃ and 70% of humidity, that is, when the image forming apparatus detects that the ambient temperature is greater than 30 ℃ and the ambient humidity is greater than 70% after the image forming apparatus is turned on, color correction is performed by the second color correction mode corresponding to the second color correction trigger condition.

When the temperature and humidity of the environment where the image forming device is located exceeds the second temperature and humidity threshold value after the color correction is executed based on the first color correction mode last time, determining that the image forming device meets a preset first color correction triggering condition. In general, the second temperature and humidity threshold is set to 15 ℃ and 30% of humidity, that is, the image forming apparatus performs color correction in the first color correction mode corresponding to the preset first color correction trigger condition when the temperature of the environment of the image forming apparatus changes by more than 15 ℃ and the humidity of the environment exceeds 30% since the last time the image forming apparatus performs color correction based on the first color correction mode.

And when the change value exceeds a third temperature and humidity threshold value after the temperature and humidity of the environment where the image forming device is located are subjected to color correction based on the second color correction mode last time, determining that the image forming device meets a preset second color correction triggering condition. In general, the third temperature and humidity threshold is set to 10 ℃ and 20% of humidity, that is, the image forming apparatus performs color correction in the second color correction mode corresponding to the preset second color correction trigger condition when the temperature of the environment of the image forming apparatus changes by more than 10 ℃ and the humidity of the environment exceeds 20% since the last time the image forming apparatus performs color correction based on the second color correction mode.

The above embodiment distinguishes the variation of the temperature and humidity of the image forming apparatus, when the variation of the temperature and humidity is large, the possibility of determining the reduction of the image forming quality is large, the long complete correction with higher correction precision is performed, and when the variation of the temperature and humidity is small, the short complete correction with short time and less powder consumption is performed, when the influence of the environmental variation of the temperature and humidity on the image forming quality is overcome, a proper correction mode can be selected according to the actual situation, the triggering times and the powder consumption of the color correction are reduced, the pattern lengths corresponding to the long complete correction and the short complete correction are different, and the pattern with the long complete correction is longer than the pattern with the short complete correction.

In some embodiments, when detecting whether the image forming apparatus satisfies a preset color correction trigger condition at S501 is performed, it includes acquiring information of the number of printed pages of the image forming apparatus.

Specifically, it is determined whether the accumulated number of printed pages reaches a preset threshold since the image forming apparatus last performed color correction. When the accumulated number of printed pages reaches a threshold value, it is determined that the image forming apparatus satisfies a preset color correction triggering condition.

Wherein when the number of pages for which color printing is cumulatively performed reaches the first page number threshold since the image forming apparatus performed color correction based on the first color correction mode last time, it is determined that the image forming apparatus satisfies a preset first color correction trigger condition. In general, the first page number threshold is set to 1000 pages, that is, the image forming apparatus performs color correction by the first color correction mode corresponding to the preset first color correction trigger condition when color printing is accumulatively performed for 1000 pages or more since the last time color correction is performed based on the first color correction mode.

When the number of pages for which color printing is cumulatively performed reaches a second page number threshold since the image forming apparatus performed color correction based on the second color correction mode last time, it is determined that the image forming apparatus satisfies a preset second color correction trigger condition. In general, the first page number threshold is set to 500 pages, that is, the image forming apparatus performs color correction by the second color correction mode corresponding to the preset second color correction trigger condition when color printing is performed cumulatively for 500 pages or more since the last time color correction is performed based on the second color correction mode.

When the number of accumulated pages for performing color printing reaches a third page number threshold since the image forming apparatus last performed color correction based on the third color correction mode, it is determined that the image forming apparatus satisfies a preset third color correction trigger condition. In general, the first page number threshold is set to 100 pages, that is, the image forming apparatus performs color correction by the third color correction mode corresponding to the preset third color correction trigger condition when performing color printing by more than 100 pages cumulatively since the last time color correction is performed based on the third color correction mode.

The above embodiment distinguishes the number of pages printed by the image forming apparatus since the last correction, when the number of printed pages is large, the possibility of determining the image forming quality to be reduced is large, long full correction with higher correction accuracy is performed, and when the number of printed pages is small, short full correction with short time and less power consumption or short position correction is performed, while overcoming the influence of multiple printing on the image forming quality, an appropriate correction mode can be selected according to the actual situation, and the number of times of triggering color correction and the amount of power consumption are reduced

In some embodiments, detecting S501 whether the image forming apparatus satisfies a preset color correction triggering condition includes detecting an imaging component of the image forming apparatus.

Specifically, when the image forming apparatus is triggered to perform detection, after the image forming apparatus is started, when one or more installed imaging components are detected to be newly installed components, it is determined that the image forming apparatus meets a preset first color correction triggering condition, for example, when a C-color imaging component is detected to be a newly installed component, it is determined that the preset first color correction triggering condition is met, or when both C-color imaging components and M-color imaging components are detected to be newly installed components, it is determined that the preset first color correction triggering condition is met, which is not limited in the present invention.

Alternatively, after the image forming apparatus is started, it is detected whether or not a newly mounted image forming assembly is among YMCK assemblies of the image forming apparatus. When any one or more of the YMCK components is/are a newly installed component, it is determined that the image forming apparatus satisfies a preset first color correction trigger condition, and color correction is performed by a first color correction mode corresponding to the preset first color correction trigger condition.

In some embodiments, detecting S501 whether the image forming apparatus satisfies a preset color correction triggering condition includes detecting a temperature of a laser scanning unit of the image forming apparatus.

Specifically, when triggering to perform detection on the image forming apparatus, it is determined whether a temperature change value of a laser scanning Unit (LASER SCANNING Unit, LSU) mounted on the image forming apparatus reaches a preset threshold value since the last time color correction is performed based on a third color correction mode. When a preset threshold is reached, it is determined that the image forming apparatus satisfies a corresponding color correction trigger condition.

Wherein, when the temperature change value of the LSU exceeds the fourth temperature and humidity threshold value since the image forming apparatus last performed color correction based on the third color correction mode, it is determined that the image forming apparatus satisfies a preset third color correction trigger condition. In general, the fourth temperature and humidity threshold is set to 3 ℃, that is, the LSU of the image forming apparatus performs color correction through the third color correction mode corresponding to the preset third color correction trigger condition when the temperature change exceeds 3 ℃ since the last time color correction is performed based on the third color correction mode.

The above-described embodiments determine whether or not an image forming assembly will have an influence on image forming quality by detecting the image forming assembly of the image forming apparatus. When detecting that a newly installed imaging component exists, the possibility of image formation quality reduction is high, long complete correction with higher correction precision is performed, when the temperature of the LSU changes, the influence of the LSU on the imaging quality is small, short position correction with short time and low powder consumption is performed, the influence on the image formation quality caused by multiple times of printing is overcome, meanwhile, a proper correction mode can be selected according to actual conditions, and the triggering times and the powder consumption of color correction are reduced.

In some embodiments, when executing S501 to detect whether the image forming apparatus satisfies a preset color correction trigger condition, further comprising determining that the image forming apparatus satisfies a preset first color correction trigger condition when the image forming apparatus is detected as being first used after the image forming apparatus is started.

Specifically, after the image forming apparatus is started, it is detected whether the image forming apparatus is first used, and when it is determined that the image forming apparatus is first used, color correction is performed by a first color correction mode corresponding to a preset first color correction trigger condition. Wherein whether the image forming apparatus is used for the first time is determined by the total number of printed pages of the image forming apparatus. When the total number of printed pages of the image forming apparatus is 0, it may be determined that the image forming apparatus has not been used before, this time being the first time; when the total number of printed pages of the image forming apparatus is not 0, it can be determined that the image forming apparatus has been used before, which is not the first use.

In some embodiments, when the image forming apparatus satisfies a preset color correction trigger condition in the course of executing a print job, it is also necessary to determine whether or not color correction needs to be executed immediately by the number of remaining print pages of the print job before color correction is executed by S503. Specifically, when the execution of color correction is triggered, it is determined whether the number of remaining pages to be printed of the print job reaches a fourth page number threshold. When the fourth page number threshold is reached, immediately executing color correction, and continuing to execute the printing task after completing the color correction; when the fourth page number threshold is not reached, the print job is continued to be executed, and after the print job is completed, color correction is executed again. In general, the fourth page count threshold is set to 10 pages, that is, when the number of remaining pages of the print job does not exceed 10 pages, the print job is continued, and when the number of remaining pages exceeds 10 pages, the color correction is preferentially executed and then the printing is continued.

In some embodiments, in the process of executing color correction in S503, when a black-and-white printing instruction is received, it is necessary to immediately suspend the color correction being executed and start execution of the black-and-white printing job, and after completion of the black-and-white printing job, execution of the color correction is resumed. In executing a black-and-white print job by the image forming apparatus, if the color correction trigger condition in the above-described color mode is reached, the color correction is not immediately executed, but when the image forming apparatus receives the color print job, the color correction in the above-described color mode is executed again and the color printing is executed.

Wherein, when the image forming apparatus executes a black-and-white print job, until the black-and-white print job ends, the color correction trigger condition needs to determine whether the color correction trigger condition in the black-and-white mode described above is satisfied. If the image forming apparatus satisfies the black-and-white correction condition, color correction in the black-and-white mode is performed, and color correction in the color mode is no longer performed.

And when the image forming apparatus satisfies the color correction trigger condition when a black-and-white print job ends, color correction is performed.

When performing a monochrome print job and performing monochrome correction, since printing is performed using only black, color misregistration of four colors of CMYK is not generated, ACR correction is not performed, and only density is corrected.

As shown in table 2, when black-and-white job printing is performed, it is necessary to perform color correction black mode, i.e., density correction corresponding to black-and-white printing operation, i.e., fourth color correction mode, fifth color correction mode in the following table. In the fourth color correction mode, it is necessary to perform the density correction corresponding to the black printing operation, that is, the black Dmax correction, the LD light intensity adjustment, the short Gamma correction, and in the fifth color correction mode, it is necessary to perform the density correction corresponding to the black printing operation, that is, the short Gamma correction. In addition, the CTD adjustment is also included in different color correction modes and is used for adjusting the background voltage of the specular reflection channel to be near a fixed value by adjusting the light power of the LEDs of the CTD sensor so as to ensure the consistency of multiple corrections of multiple machines.

Table 2 (different color correction pattern example two)

Illustratively, as shown in fig. 6 to 12, fig. 6 and 7 are examples of two correction patterns used at the time of Dmax correction, fig. 8 and 9 are examples of two correction patterns used for LD light intensity adjustment, fig. 10 is an example of 45-degree 1by3 diagonal color blocks in fig. 8 and 9, fig. 11 is an example of a correction pattern used for long Gamma correction, fig. 12 is an example of a correction pattern used for short Gamma correction, and correction patterns used for long ACR correction and short ACR correction are not shown.

As shown in fig. 6, the Dmax correction pattern of the first example is composed of a left pattern and a right pattern, the left pattern is arranged by 100% solid color patches of K color and 100% solid color patches of M color at intervals, and the right pattern is arranged by 100% solid color patches of C color and 100% solid color patches of Y color at intervals. The Dmax correction pattern of the first example shown in fig. 6 is used in an image forming apparatus in which the CTD sensor detection color density deviation is small, and the correction time can be reduced with the effect ensured by detecting 4 colors using two sensors since the CTD sensors on the left and right sides detection deviation is small.

As shown in fig. 7, the Dmax correction pattern of the second example is composed of a left pattern and a right pattern, the left pattern is sequentially arranged at intervals by 100% solid color patches of K colors, and the right pattern is sequentially arranged at intervals by 100% solid color patches of C colors, 100% solid color patches of M colors, and 100% solid color patches of Y colors. Using the Dmax correction pattern of the second example can avoid that CMY is detected by the same sensor without color shift after correction due to errors between sensors (e.g., detection errors between sensors, such as actual color density of one patch being 1.2, different sensor detection results being in the range of 1.1-1.3). The Dmax correction pattern of the first example shown in fig. 6 is used in an image forming apparatus in which the CTD sensor detects a large color density deviation, and since the two sensors detect the color density with an error CMY, it is ensured that the image is not color-deviated only by using the same sensor correction.

As shown in fig. 8, the LD light intensity adjustment correction pattern of the first example is composed of a left side pattern and a right side pattern, the first two color patches of the left side pattern are 100% solid color patches of K color and 100% solid color patches of M color at a time, and the latter color patches are arranged at intervals by K color 45 degree 1by3 oblique line color patches and M color 45 degree 1by3 oblique line color patches. The right side pattern is formed by using the first two color blocks as 100% pure color blocks of C color and 100% pure color blocks of Y color at a time, and the later color blocks are arranged at intervals by using 45-degree 1by3 oblique line color blocks of C color and 45-degree 1by3 oblique line color blocks of Y color. The LD light intensity adjustment correction pattern of the first example shown in fig. 8 is used in an image forming apparatus in which the CTD sensor detection color density deviation is small, and the correction time can be reduced on the premise of ensuring the effect because the CTD sensors on the left and right sides detect 4 colors with small detection deviation.

As shown in fig. 9, the LD light intensity adjustment correction pattern of the second example is composed of a left side pattern and a right side pattern, the former color patch of the left side pattern is 100% pure color patch of K color at a time, and the latter color patches are sequentially arranged at intervals by 45 degrees 1by3 oblique line color patches of K color. The front three color blocks of the right pattern are sequentially 100% pure color blocks of C color, 100% pure color blocks of M color and 100% pure color blocks of Y color, and the rear color blocks are sequentially arranged at intervals by C color 45-degree 1by3 oblique line color blocks, M color 45-degree 1by3 oblique line color blocks and Y color 45-degree 1by3 oblique line color blocks. The LD light intensity adjustment correction pattern of the second example shown in fig. 8 is used in an image forming apparatus in which the CTD sensor detects a large deviation in color density, and since the two sensors detect the presence of an error CMY in color density, it is ensured that the image is not color-deviated only by correction using the same sensor.

As shown in fig. 10, fig. 10 is an example of 45-degree 1by3 diagonal color patches in fig. 8 and 9. Fig. 10 is an enlarged view of an LD correction patch, which is a correction stage for adjusting the 1pixel thin line printing effect, with which the 1pixel thin line printing effect can be reflected in color density.

As shown in fig. 11, the long Gamma correction pattern is composed of a left pattern composed of K-tone 16-gradation block groups and a right pattern composed of Y-tone 16-gradation block groups, M-tone 16-gradation block groups, C-tone 16-gradation block groups in this order. K is on one side and YMC is on the other side as in the previous calibration phase. Gamma correction is a correction stage for adjusting the gradation printing effect, and the correction effect is ensured by using 16 gradation correction for each color in the long correction.

As shown in fig. 12, the short Gamma correction pattern is composed of a left pattern composed of K-tone 8-gradation block groups and a right pattern composed of Y-tone 8-gradation block groups, M-tone 8-gradation block groups, C-tone 8-gradation block groups in this order. The short Gamma correction for each color uses 8 gradation, slightly reduces the correction effect and reduces the correction time.

In some embodiments, the color correction may be manually triggered by the user during use of the image forming apparatus when the user manually observes that the printed portrait is not good and wants to immediately improve the quality of the printed portrait.

Specifically, a function of triggering color correction is designed on a control panel of the image forming apparatus, through which a user can actively trigger color correction to adjust image quality.

Wherein the color correction may be triggered manually in a ready state of the image forming apparatus. After the image forming device is started and preheated, a user with higher requirements on the quality of printed images can manually trigger one-time correction after the image forming device is preheated, or the printed images are found to be poor in effect after the image printing is finished, and the color correction is manually triggered. Optionally, the method can be triggered in the printing and copying processes of the image forming device or triggered when the image forming device executes the operations of scanning, faxing and the like, the quality of the printed color image is poor in the printing and copying processes, the home key is clicked on the panel, the color correction menu is selected, the color correction is automatically executed in the printing process of the image forming device, and the automatic switching to the printing operation is performed after the correction is finished, so that the high quality of the image printed later is ensured.

The user can make up for the scene of the print portrait quality which is judged by the image forming line and the color correction is automatically triggered and does not meet the current user requirement by manually triggering the color correction by the user, a more convenient triggering mode is provided for the user, the user actively initiates adjustment of the portrait quality, and the problem of poor portrait effect in the printing process of the portrait is solved. The integrity of the image forming device in triggering the color correction mechanism is ensured, the image forming device can be automatically triggered or passively triggered, and the wide scene of the application of the color correction function is greatly improved. The operability of the image forming device and the adjustability of the printing quality are improved, and the high quality rate of the image forming device is improved.

In some embodiments, when Dmax correction is executed, the charging and developing voltages of the four colors of CMYK are adjusted to ensure that the maximum concentration values of the four colors of CMYK meet design requirements in different environments and different service life stages, namely, the charging and developing voltages are adjusted in the color correction stage to ensure that the maximum color density of the printed image in different environments and service life stages of the machine meets design specifications, so that the shallow correction stage of the printed image is avoided. In this embodiment, the correction does not determine the MHV (charging high voltage), but determines the MHV correction value.

Illustratively, a method for obtaining the correction value of MHV by Dmax correction in the present embodiment is shown in fig. 13, and the method is specifically as follows:

s1301, dmax correction starts.

S1302, issuing a Dmax correction image to an image forming apparatus;

The image forming apparatus acquires a Dmax corrected image and performs Dmax correction based on the corrected image, an example of which can be referred to fig. 6.

S1303, opening MHV and DEV for normal printing according to time sequence.

When the image forming apparatus acquires the Dmax correction image, MHV (Main High Voltage, charging high voltage) and DEV (Developing Voltage, developing high voltage) are turned on in accordance with the normal printing timing.

S1304, the LD optical power of CMYK four colors is turned on by a fixed parameter.

And starting fixed parameters of LD (Laser Diode) optical power corresponding to the four colors.

S1305, adjusting the MHV and the DEV of four colors according to the time sequence corresponding to the image color block.

MHV and DEV of CMYK four colors in a corresponding patch in the image are corrected according to a predetermined print timing on Dmax.

S1306, CTD Sensor reads data.

The detection data of the read Dmax correction image is acquired by a CTD Sensor.

S1307, dmax corrected image characteristic data is obtained and calculated.

S1308, a dev_dc predetermined value is calculated by feeding back a predetermined value.

DEV_DC (developing voltage DC value) is calculated based on the detection data of the detected image.

S1309 saves and uses the obtained dev_dc correction value.

S1310, calculating the MHV correction value.

S1311, save and use the MHV correction value.

S1312, dmax correction is completed.

The correction value of MHV can be obtained based on Dmax correction in the above manner.

As shown in FIG. 14, FIG. 14 shows a timing diagram of the opening of MHV and DEV in performing Dmax correction, in which

The DEV of each color in the correction process can be started to 7 different voltages, so that 7 color blocks of the color of the correction image are exactly at 7 voltage values when the 7 color blocks are developed, the stage of the DEV is related to the image, if the correction image has 6 color blocks DEV of each color, 6 segments are also required to be started, each segment of voltage corresponds to one color block to be developed, and understandably, 4 color blocks DEV of each color in the correction image can be set.

In the Dmax correction process, four different charging and developing voltage values are designed on time sequence for different color blocks of four colors corresponding to four colors of CMYK, different color densities are obtained based on different voltage values, and then charging and developing voltage values used for estimating the target color density are interpolated.

When the correction image is detected by using the left and right CTD sensors, the left CTD Sensor detects 8 color densities of two colors of K/M, where K uses specular reflection channel data, M uses diffuse reflection channel data, and the right CTD Sensor detects 8 color densities of two colors of C/Y, both using diffuse reflection channel data.

In some embodiments, when the CTD sensor is adjusted, the CTD sensor is initialized, the CTD sensor is also called IDC (IMAGE DENSITY Control) sensor, and the image forming apparatus performs CTD sensor adjustment when the environment is greatly changed or the last correction process is accidentally terminated, and the special condition that the toner is attached to the surface of the transfer belt on the surface of the sensor is detected, so as to detect whether the CTD sensor fails, and find the target value of the LED light power in the current environment.

The CTD sensor is a sensor for detecting a patch position shift and a density of a color correction image on an intermediate transfer belt, and includes a light emitting section and a light receiving section, the light receiving section having at least one of specular reflection and diffuse reflection.

As shown in fig. 15, the method for adjusting the CTD sensor specifically includes the following steps:

s1501, CTD Sensor adjustment starts.

S1502, the two-side sensor LEDs are turned on.

Namely, the light emitting means LED for emitting light of the left CTD Sensor and the right CTD Sensor are turned on.

S1503, whether the CTD Sensor feedback data is abnormal or not.

By collecting feedback data from the CTD sensor, it is determined whether or not an abnormality has occurred in the feedback data, and S1504 is executed when it is determined that an abnormality has occurred, and S1506 is executed when it is determined that no abnormality has occurred.

S1504, the image forming apparatus is in abnormal state, and the intermediate transfer belt is cleaned.

When it is determined that an image forming apparatus state abnormality occurs based on feedback data of the CTD sensor, the intermediate transfer belt is cleaned.

It is first judged that if the data abnormality occurs once, it is likely that the intermediate transfer belt is seriously contaminated, so that it is re-measured after cleaning the intermediate transfer belt for one week, and if the data abnormality continues to occur, it is judged that it is a CTD Sensor abnormality.

S1505, CTD Sensor feedback data is abnormal.

After the cleaning of the intermediate transfer belt in S1504 is completed, it is again determined whether the feedback data of the CTD Sensor is abnormal, S1507 is executed when it is determined that an abnormality has occurred, and S1506 is executed when it is determined that no abnormality has occurred.

S1506, saving and opening the adjusted LED optical power parameters.

When it is determined that no abnormality has occurred in the feedback data of the CTD sensor, the optical power parameters of the LEDs of the sensor are saved and the adjusted parameters are turned on and S1508 is performed.

S1507, CTD Sensor abnormality or image forming apparatus abnormality.

When it is determined that the feedback data of the CTD Sensor is abnormal again, it may be determined that the CTD Sensor is abnormal or the image forming apparatus is abnormal instead of erroneous determination due to lack of cleaning of the intermediate transfer belt, and S1509 is performed.

S1508, the temperature and humidity value of the current CTD Sensor is saved.

And storing and opening the temperature and humidity value of the current CTD Sensor position after storing and opening the adjusted LED light power parameter, and executing S1510.

S1509, the image forming apparatus gives an abnormality notice.

When it is determined that the CTD Sensor is abnormal or the image forming apparatus is abnormal, an image forming apparatus abnormality notification is performed.

S1510, CTD Sensor adjustment is finished.

After finishing S1508, the temperature and humidity value of the current CTD Sensor is saved, which means that the adjustment of the CTD Sensor is completed.

It should be noted that, before S1506, a flow of adjusting LED optical power of the CTD Sensor is further included, specifically referring to the method flowchart of fig. 16, including:

s1601, CTD Sensor data anomaly determination starts.

S1602, turning on the maximum optical power of the two-side sensor LEDs.

S1603, the specular and diffuse channel feedback values are read.

S1604, judging whether the feedback value meets the requirement.

If it is determined in S1604 that the feedback value does not meet the requirement, S1609 is executed, and if it is determined that the feedback value meets the requirement, S1605 is executed.

S1605, the two-side sensor LED minimum optical power is turned on.

S1606, the specular and diffuse channel feedback values are read.

S1607, whether the feedback value meets the requirement.

The feedback value read in S1607 is determined, S1608 is executed when the feedback value is determined to satisfy the requirement, and S1609 is executed when the feedback value is determined to not satisfy the requirement.

S1608, judging to end, and feeding back 'no abnormality'.

S1609, the judgment ends, and the feedback "abnormal".

The following describes a detailed procedure for detecting feedback values of the collected CTD Sensor and performing abnormality judgment based on the feedback values:

1. starting the maximum light power of CTD Sensor LEDs at two sides, wherein the duty ratio is 100%, and the duration is 500ms;

2. After the LED is started for 100ms, the feedback values of the mirror reflection channels of the sensors at two sides are read, 30 data are read once every 10ms, 3 maximum and minimum values are removed, 24 average values are left, and the average value is recorded as: v_led_f_p_max, v_led_r_p_max;

3. the diffuse reflection channel feedback values of the sensors at the two sides are read in the time delay of 100ms when the LEDs are started, 30 data are read once every 10ms, 3 maximum and minimum values are removed, 24 average values are left, and the average values are recorded as: v_led_f_s_max, v_led_r_s_max;

4. judging whether the V_LED_F_P_MAX and the V_LED_R_P_MAX are larger than a judging value V_LED_P_1 (for example, 1000), and entering the next step if the V_LED_F_P_MAX and the V_LED_P_MAX are larger than the V_LED_P_1, otherwise ending judging logic, and feeding back 'abnormality';

5. Judging whether the V_LED_F_S_MAX and the V_LED_R_S_MAX are larger than a judging value V_LED_S_1 (for example, 80) or not, and entering the next step if the V_LED_F_S_MAX and the V_LED_R_S_MAX are larger than the judging value V_LED_S_1, otherwise ending judging logic, and feeding back 'abnormality';

6. Starting the minimum optical power of CTD Sensor LEDs at two sides, wherein the duty ratio is 5%, and the duration is 500ms;

7. The feedback value is read by adopting the same method as the second and third steps, and is recorded as: v_led_f_p_min, v_led_r_p_min, v_led_f_s_min, v_led_r_s_min;

8. Judging whether the difference value between the feedback value of the specular reflection channel and the maximum light power is satisfied or not, namely: V_LED_F_P_MAX_V_LED_F_P_MIN > V_LED_P_2 and V_LED_R_P_MAX_V_LED_R_P_MIN > V_LED_P_2, meet the requirements, feed back "no anomaly" and not feed back "anomaly".

9. Judging whether the difference value between the diffuse reflection channel feedback value and the maximum light power is satisfied, namely: V_LED_F_S_MAX-V_LED_F_S_MIN > V_LED_S_2 and V_LED_R_S_MAX-V_LED_R_S_MIN > V_LED_S_2, meet the requirements, feed back "no anomaly" and not feed back "anomaly".

In addition, the CTD Sensor LED optical power adjustment flow is described in detail as follows:

1. LED light power is adjusted to a Target value (V_LED_Target+ -D_LED) by adopting a dichotomy:

2. each section of optical power is started for 500ms, the feedback values of diffuse reflection channels at two sides are read, and the reading method is the same as the CTD Sensor data abnormality judgment logic;

3. When the maximum and minimum optical power values are started in the CTD Sensor data abnormity judgment flow, the diffuse reflection channel feedback value data is stored and applied to the optical power adjustment flow;

4. Searching the optical power value of the diffuse reflection channel feedback value in the Target range (V_LED_target+/-D_LED) by using a dichotomy;

5. starting to time from starting the LED, stopping correction and feeding back failure when the target optical power value is not found in the phase of adjusting the optical power for more than 5 s;

6. And after the Target light power value is found in the set time, starting and storing the Target light power value (LED_F_target).

In addition, a flow of cleaning the intermediate transfer belt is described in detail as follows:

The CTD Sensor LED is turned off and the associated voltage and respective motor parameters are maintained consistent with the previous stage (e.g., parameters of charge high voltage, development high voltage, transfer high voltage, extinction lamp, LD optical power, etc., K imaging assembly motor and CMY imaging assembly motor, etc.) for a predetermined time, e.g., 7.3s.

As shown in fig. 17, the embodiment of the present application further provides a method for detecting by a CTD sensor, where the CTD sensor detects the optical power of the CTD sensor that is turned on in the current environment, and detects whether the value detected on the surface of the intermediate transfer belt is within a specified range, and if not, the next correction uses the correction mode adjusted by the additional sensor.

The method specifically comprises the following steps:

s1701, CTD Sensor detection starts.

S1702, turning on the two-side sensor LEDs.

S1703, whether the CTD Sensor feedback data is abnormal or not.

In S1703, it is determined whether or not feedback data of the CTD Sensor is abnormal, and when it is determined that an abnormality has occurred, S1706 is executed, and when it is determined that no abnormality has occurred, S1704 is executed.

S1704, turning on the LED light power of the two side sensors stored after the last CTD Sensor adjustment and continuing to execute S1705.

S1705, whether the diffuse reflection feedback value of the CTD Sensor at two sides is in the target range or not.

In S1705, it is determined whether or not the two-sided CTD Sensor diffuse reflection feedback value is within the target range, and S1710 is executed when it is determined that it is not within the target range, and S1711 is executed when it is determined that it is within the target range.

S1706, the image forming apparatus is abnormal in state, cleaning the intermediate transfer belt.

When it is determined that CTD Sensor feedback data is abnormal, cleaning of the intermediate transfer belt is required and the execution of S1707 is continued.

S1707, whether the CTD Sensor feedback data is abnormal or not.

In S1707, it is determined whether or not the CTD Sensor feedback data is abnormal, and when it is determined that no abnormality has occurred, S1704 is executed, and when it is determined that an abnormality has occurred, S1708 is executed.

S1708, CTD Sensor abnormality or image forming apparatus abnormality.

S1709 is continued to be executed when it is determined that CTD Sensor is abnormal or the image forming apparatus is abnormal.

S1709, the image forming apparatus abnormality cue.

S1710, after this correction is finished, the next correction triggers CTD Sensor adjustment no matter what mode and continues to S1711.

S1711, CTD Sensor adjustment ends.

CTD Sensor is used only at the time of color correction, so it is necessary to detect whether CTD Sensor functions normally before each correction. The LED light of the CTD Sensor before correction is emitted onto the smooth intermediate transfer belt, most of the light is specularly reflected into the P-channel, and less light is received by the S-channel. The range of P-channel ADC values is 0-3300 and the range of S-channel ADC values is approximately 0-200 in the interval of the PWM duty cycle of the LED from 0-100%.

The judgment logic of the P channel is shown in fig. 18, and whether the variation of the ADC value fed back by the P, S channels reaches the standard is checked according to the light intensity of the two adjustment LEDs to judge whether the CTD Sensor fails or not. The CTD Sensor failure is not necessarily a CTD Sensor failure, but may be other conditions such as a CTD Sensor external circuit failure, CTD Sensor window contamination, etc.

In fig. 19, the detection principle of the CTD Sensor is described in detail.

CTD Sensor is a Sensor installed downstream of the black image forming assembly and upstream of the secondary transfer roller for detecting the toner concentration on the intermediate transfer belt, and has the following structure:

The light emitting part emits infrared light to irradiate the intermediate transfer belt, and the two light receiving parts can detect the received light intensity and feed back different voltages according to the light intensity. The light emitting part emits light, diffuse reflection and specular reflection are carried out on the surface of the carbon powder image, the specular reflection corresponds to P waves, the diffuse reflection corresponds to S waves, the P waves are strong, the S waves are weak, the P waves (specular reflection) are sensitive to black and insensitive to color, when the color image concentration is high, the specular reflection is difficult to detect the color image concentration change, and the S waves (diffuse reflection) are sensitive to color and insensitive to black. Actually, according to the change of the carbon powder concentration, the roughness of the carbon powder surface is changed, the light emitted by the sensor is diffusely reflected and specularly reflected from the carbon powder image to obtain different output voltage detection color lump concentrations, the coarser the carbon powder surface is, the stronger the diffuse reflection signal is, the weaker the specularly reflection signal is, and the output voltage value is correspondingly changed. Corresponding to the color correction method, the embodiment of the application also provides a color correction device.

The purpose of carrying out LD light intensity correction is to ensure that 1dot point and 1pixel fine line of four colors of CMYK can be printed normally, and the fine line and the dot of an image printed by an image forming device in different environments and service life stages can be displayed normally by adjusting LSU light power in different color correction stages, so that the condition of poor visibility or broken line does not occur. As shown in fig. 20, fig. 20 is a method for correcting LD light intensity according to an embodiment of the present application, which includes the following steps:

S2001, LD Power correction starts.

LD Power correction, that is, LD light intensity correction, turns on LD light intensity correction.

S2002, issuing LD Power correction portrait to the image forming device.

S2003, starting Dmax correction and storage of high voltage according to the time sequence.

S2004, adjusting LD Power corresponding to the image color block.

S2005, CTD Sensor reads data.

S2006, obtaining and calculating LD Power adjusted image characteristic data.

S2007, an LD Power correction value is calculated by feeding back a predetermined value.

S2008, the obtained LD Power correction value is saved.

S2009, LD Power correction is completed.

In fig. 21, the use of parameters in the correction of the light intensity of the LD for Y color and M color in the time sequence is illustrated, and as shown in fig. 21, the step part in the time sequence diagram is the step light power of Level1-Level4 in the correction process, and 4 different light powers are designed on the time sequence for the 4 color blocks corresponding to each color in the LD light intensity correction process, the different light powers obtain different color densities, and then the LSU light power used for estimating the target color density is interpolated.

Referring to fig. 22, a schematic structural diagram of a color correction device according to an embodiment of the present application, where the color correction device is applied to an image forming apparatus, may include: a detection module 2201, a determination module 2202, and a correction module 2203.

The detection module 2201 detects whether the image forming apparatus satisfies a preset color correction triggering condition.

The determination module 2202 determines a target color correction pattern corresponding to the satisfied preset color correction trigger condition when the preset color correction trigger condition is satisfied.

The correction module 2203 performs color correction on the image forming apparatus based on the target color correction mode.

Fig. 23 is a schematic structural view of an embodiment of the electronic device of the present specification. The electronic device may be implemented as the image forming device described above. As shown in fig. 23, the electronic device may include at least one processor; and at least one memory communicatively coupled to the processing unit, wherein: the memory stores program instructions executable by the processing unit, and the processor invokes the program instructions to perform the color correction method provided in the present embodiment.

The electronic device may be a device capable of performing an intelligent dialogue with a user, for example: the cloud server, the embodiment of the present disclosure does not limit the specific form of the electronic device. It is understood that the electronic device herein is the machine mentioned in the method embodiment.

Fig. 23 shows a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the present description. The electronic device shown in fig. 23 is only an example, and should not impose any limitation on the functions and the scope of use of the embodiments of the present specification.

As shown in fig. 23, the electronic device is in the form of a general purpose computing device. Components of an electronic device may include, but are not limited to: one or more processors 2310, a communication interface 2320, a memory 2330, and a communication bus 2340 that connects the various system components (including the memory 2330, the communication interface 2320, and the processor 2310).

Communication bus 2340 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include industry Standard architecture (Industry Standard Architecture; hereinafter ISA) bus, micro channel architecture (Micro Channel Architecture; hereinafter MAC) bus, enhanced ISA bus, video electronics standards Association (Video Electronics Standards Association; hereinafter VESA) local bus, and peripheral component interconnect (PERIPHERAL COMPONENT INTERCONNECTION; hereinafter PCI) bus.

Electronic devices typically include a variety of computer system readable media. Such media can be any available media that can be accessed by the electronic device and includes both volatile and nonvolatile media, removable and non-removable media.

Memory 2330 may include computer system readable media in the form of volatile memory, such as random access memory (Random Access Memory; hereinafter: RAM) and/or cache memory. The electronic device may further include other removable/non-removable, volatile/nonvolatile computer system storage media. Memory 2330 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the embodiments of the present description.

A program/utility having a set (at least one) of program modules may be stored in the memory 2330, including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules typically carry out the functions and/or methods of the embodiments described herein.

The processor 2310 executes various functional applications and data processing, such as implementing the color correction method provided in the embodiment shown in the present specification, by running a program stored in the memory 2330.

Embodiments of the present specification provide a non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the color correction method provided by the embodiments shown in the present specification.

The non-transitory computer readable storage media described above may employ any combination of one or more computer readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory; EPROM) or flash Memory, an optical fiber, a portable compact disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for the present specification may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (Local Area Network; hereinafter: LAN) or a wide area network (Wide Area Network; hereinafter: WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three, etc., unless explicitly defined otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present specification in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present specification.

Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.

It should be noted that, the terminals in the embodiments of the present disclosure may include, but are not limited to, a Personal Computer (Personal Computer; hereinafter referred to as a PC), a Personal digital assistant (Personal DIGITAL ASSISTANT; hereinafter referred to as a PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), a mobile phone, an MP3 player, an MP4 player, and the like.

In the embodiments provided in the present specification, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

In addition, each functional unit in each embodiment of the present specification may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a Processor (Processor) to perform part of the steps of the methods described in the embodiments of the present specification.

The foregoing description of the preferred embodiments is provided for the purpose of illustration only, and is not intended to limit the scope of the disclosure, since any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the disclosure are intended to be included within the scope of the disclosure.

Claims

1. A color correction method applied to an image forming apparatus, comprising:

2. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition includes:

3. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition includes:

4. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition specifically includes: detecting the environment in which the image forming device is located;

5. The method of claim 4, wherein determining whether the temperature and humidity at which the image forming apparatus is located reaches a preset threshold comprises:

6. The method according to claim 4, wherein determining whether the change value of the ambient temperature and humidity reaches a preset threshold value since the image forming apparatus last performed color correction comprises:

7. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition specifically includes: acquiring printing page number information of the image forming device;

8. The method of claim 7, wherein the determining that the image forming apparatus satisfies the preset color correction triggering condition when a threshold is reached comprises:

9. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition specifically includes: detecting a temperature of a laser scanning unit of the image forming apparatus;

10. The method according to claim 9, wherein the determining that the image forming apparatus satisfies the preset color correction trigger condition when a threshold is reached comprises:

11. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition specifically includes: detecting an imaging component of the image forming device:

12. The method according to claim 1, wherein the detecting whether the image forming apparatus satisfies a preset color correction trigger condition further comprises:

13. The method according to claim 1, wherein the method further comprises:

14. The method according to any one of claims 1-13, wherein the performing color correction on the image forming apparatus based on the target color correction pattern comprises:

15. The method according to claim 1, wherein the method further comprises:

16. A color correction device applied to an image forming apparatus, the device comprising:

17. An electronic device, comprising:

at least one processor; and

At least one memory communicatively coupled to the processor, wherein:

The memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1-15.

18. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the method of any one of claims 1 to 15.