CN118018699A

CN118018699A - Color correction method, image forming apparatus, and storage medium

Info

Publication number: CN118018699A
Application number: CN202410104323.9A
Authority: CN
Inventors: 梁嘉俊
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Zhuhai Pantum Electronics Co Ltd
Priority date: 2023-03-16
Filing date: 2024-01-24
Publication date: 2024-05-10
Also published as: CN116320338A

Abstract

The invention relates to the technical field of image formation, in particular to a color correction method, which comprises the following steps: acquiring a job to be processed; inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed, and/or inserting the first image before/after the specific job page contained in the job to be processed; acquiring a detection result of a transfer image formed by the first image on the image carrier; judging whether the detection result reaches the condition of triggering color correction; if so, color correction is performed. According to the embodiment of the invention, the color correction can be triggered in time according to the detection result of the inserted image, so that the timeliness of the image forming device for executing the color correction is ensured, and the image quality effect of the image output by the image forming device is ensured.

Description

Color correction method, image forming apparatus, and storage medium

Technical Field

The present invention relates to the field of image forming technologies, and in particular, to a color correction method, an image forming apparatus, and a storage medium.

Background

An image forming apparatus is an apparatus that forms an image on an image forming medium based on an image forming principle, including but not limited to a printer, a copier, a facsimile machine, a scanner, a multifunction device, an electrostatic printing device, and any other apparatus that may realize an image forming function. In order to secure the image quality effect of image formation, it is necessary to perform color correction on the image forming apparatus. The conditions triggering color correction in the related art generally include: the consumable used by the image forming device is a new product, the number of pages of a printed job reaches a set value or the environmental temperature and humidity change is large. However, in this way, there is a possibility that the image quality is poor, but the trigger condition of the color correction is not reached, and the printing effect of the image forming apparatus is affected.

Disclosure of Invention

In view of the above, embodiments of the present invention provide a color correction method, an image forming apparatus, and a storage medium capable of timely triggering color correction according to a detection result of a first image inserted in an interval of a part or all of adjacent job pages of a job to be processed and/or a first image inserted before/after a specific job page included in the job to be processed, thereby ensuring an timeliness of the image forming apparatus performing color correction to ensure an image quality effect of an image output by the image forming apparatus.

In a first aspect, an embodiment of the present invention provides a color correction method, including:

acquiring a job to be processed;

Inserting a first image in the interval of part or all of adjacent job pages of the job to be processed, and/or inserting the first image before/after a specific job page contained in the job to be processed, or inserting the first image in the interval of preparing to execute the next job to be processed after completing the job to be processed for determining whether to trigger color correction;

Acquiring a detection result of a transfer image formed on an image carrier by the first image;

judging whether the detection result reaches the condition of triggering color correction;

if so, color correction is performed.

Optionally, the inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed, and/or inserting the first image before/after the specific job page included in the job to be processed includes:

Dividing a complete correction trigger image into a plurality of sub-images, wherein the height of each sub-image is smaller than the interval between adjacent operation pages along the conveying direction of an imaging medium; inserting the sub-image into the interval of part or all of adjacent job pages of the job to be processed, and taking the sub-image as the first image; or alternatively

Inserting the complete correction trigger image as a job page between part or all of adjacent job pages of the job to be processed, and taking the complete correction trigger image as the first image; or alternatively

Dividing the complete correction trigger image into a plurality of sub-images, wherein the height of each sub-image is smaller than the interval between adjacent operation pages along the conveying direction of an imaging medium; inserting the sub-image before/after a specific job page contained in the job to be processed, and taking the sub-image as the first image; or alternatively

And inserting the complete correction trigger image as a job page before/after a specific job page contained in the job to be processed, and taking the complete correction trigger image as the first image.

Optionally, the determining whether the detection result reaches a condition for triggering color correction includes:

And judging whether the color register deviation value or the color lump concentration deviation value of the transfer image formed on the image carrier by the first image reaches the condition of triggering color correction.

And judging whether a condition for triggering color correction is reached or not according to detection results of all the first images or detection results of part of the first images inserted before/after the interval of part or all of the adjacent job pages of the job to be processed and/or the specific job page contained in the job to be processed.

Optionally, the inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed, and/or before inserting the first image before/after the specific job page included in the job to be processed, the method further includes:

determining a target correction pattern from a plurality of correction patterns, wherein each correction pattern is associated with at least one correction trigger image;

Determining the first image for insertion in the interval of part or all of the adjacent job pages of the job to be processed from at least one correction trigger image associated with the target correction pattern, and/or determining the first image for insertion before/after a specific job page contained in the job to be processed from at least one correction trigger image associated with the target correction pattern.

Optionally, the determining the target correction mode from the plurality of correction modes includes:

And determining the target correction mode from the plurality of correction modes according to one or more of the current environment temperature and humidity, the number of printing pages of the to-be-processed job, whether a developing assembly is replaced or not and the temperature change of the laser scanning unit.

Optionally, if the color correction is achieved, performing color correction includes:

firstly suspending printing of the rest job pages of the job to be processed to execute color correction; or executing color correction after printing is finished on the job to be processed; or alternatively

And determining whether to immediately execute color correction according to the number of the residual pending job pages corresponding to the pending job.

In a second aspect, an embodiment of the present invention provides an image forming apparatus including: a job acquisition module, a color correction triggering module, an image forming module, and a color correction execution module, the image forming module comprising: the device comprises a laser scanning unit, a developing assembly and an image carrier, wherein a detection device is arranged on the image carrier; wherein,

The job acquisition module is used for acquiring a job to be processed;

The color correction triggering module is used for inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed and/or inserting the first image before/after the specific job page contained in the job to be processed, wherein the first image is used for determining whether to trigger color correction;

The image forming module is used for forming a transfer image of the first image on the image carrier through a laser scanning unit and a developing assembly; the detection device is used for acquiring a detection result of a transfer image formed by the first image on the image carrier and sending the detection result to the color correction triggering module;

the color correction triggering module is further used for judging whether the detection result reaches the condition of triggering color correction;

The color correction execution module is used for executing color correction when the condition triggering color correction is reached.

Optionally, the color correction triggering module is specifically configured to:

and judging whether a color register offset value or a color patch density error value of a transfer image formed by the first image on the image carrier reaches a condition triggering color correction.

and judging whether a condition triggering color correction is reached according to detection results of all first images or detection results of part of the first images inserted before/after a part or all of adjacent job pages of the job to be processed and/or a specific job page contained in the job to be processed.

Optionally, the color correction triggering module is further configured to:

Inserting a first image in the interval of part or all of adjacent job pages of the job to be processed, and/or determining a target correction mode from a plurality of correction modes before/after inserting the first image before/after a specific job page contained in the job to be processed, wherein at least one correction trigger image is associated with each correction mode;

Optionally, the color correction execution module is specifically configured to:

In a third aspect, an embodiment of the present invention provides an image forming apparatus including: the device comprises a laser scanning unit, a developing assembly and an image carrier, wherein a detection device is arranged on the image carrier; further comprises:

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, an embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored program, where the program when run controls a device in which the computer readable storage medium is located to perform the method according to any one of the first aspects.

In the embodiment of the present invention, when the image forming apparatus acquires the job to be processed, the image forming apparatus may insert the first image in the interval of part or all of the adjacent job pages of the job to be processed and/or before/after the specific job page included in the job to be processed. The first image may be image formed with the job to be processed. Wherein in the process of image formation of the first image, the image forming apparatus can acquire a detection result of the transfer image formed from the first image, and can judge the current imaging quality of the image forming apparatus based on the detection result, and can further judge whether the condition for triggering color correction is currently reached. And color correction can be performed in time when the condition for triggering color correction is reached, thereby ensuring the image quality effect of the image output by the image forming apparatus with a time rate at which the image forming apparatus performs color correction.

Drawings

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

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

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

FIG. 3 is a schematic diagram of a detecting device according to an embodiment of the present invention;

fig. 4 is a schematic structural view of another 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 is a flowchart of another color correction method according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of dividing a complete corrected trigger image into sub-images according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of inserting a first image into the space between some or all of the adjacent job pages of a job to be processed according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of another embodiment of inserting a first image into the space between some or all of the adjacent job pages of a job to be processed;

fig. 10 is a schematic structural view of an image forming apparatus according to an embodiment of the present invention;

fig. 11 is a schematic structural view of another image forming apparatus according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the related art, an image forming apparatus generally performs color correction when a consumable item used is a new one, the number of pages of a printed job reaches a set value, or the environmental temperature and humidity change is large. However, in this way, there is a possibility that the image quality of the image output by the image forming apparatus is already poor, but the trigger condition for color correction is not yet reached. The image forming apparatus cannot trigger color correction when the output image quality is poor, and the operation effect of the image forming apparatus is affected.

In order to solve the above problems, an embodiment of the present invention provides a color correction method. When the method of the embodiment of the invention obtains the to-be-processed job, the first image can be inserted in the interval of part or all of the adjacent job pages of the to-be-processed job, and/or the first image can be inserted before/after the specific job page contained in the to-be-processed job. The first image may enter a workflow of image formation with the job to be processed. Wherein, in the process of image formation of the first image, the image forming apparatus may acquire a detection result of the transfer image formed from the first image. Based on the detection result, the image forming apparatus can determine the image quality of the currently output image, and further can determine whether the condition for triggering color correction is currently reached. And color correction can be performed in time when the condition for triggering color correction is reached, thereby ensuring the image quality effect of the image output by the image forming apparatus.

Referring to fig. 1, a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention is provided. As shown in fig. 1, the image forming apparatus includes a processing section, an imaging device, a detecting device, and a storage unit. The imaging device, the detection 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 detecting 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, a laser scanning Unit (LASER SCANNING Unit, LSU, laser scanning Unit), an image carrier, and the like. The detection device is used for acquiring related data of the environment where the imaging equipment is located. As shown in fig. 3, the detection device may include a CTD sensor (Counterpoint Density Sensor, abbreviated as CTD sensor), a temperature and humidity sensor, and the like. The CTD sensor is used to detect a transfer image formed on an image carrier, which may be a transfer belt or a photosensitive drum, wherein the transfer belt may be an intermediate transfer belt or a primary transfer belt, or the like. 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.

Referring to fig. 1 to 4, the operation procedure of the image forming apparatus includes: the processing section acquires a job to be processed. In order to be able to determine the timing of triggering color correction during execution of printing of a job to be processed, the processing section inserts a first image in the interval of part or all of the adjacent job pages of the job to be processed and/or inserts the first image before/after a specific job page included in the job to be processed, the first image entering an image forming flow with the job to be processed. Specifically, the processing section converts the job to be processed and the inserted first image 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 with developer on the transfer belt is used to transfer to an imaging medium (e.g., physical 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. Alternatively, the embodiment of the invention can transfer the transfer image corresponding to the job to be processed onto the imaging medium, and the transfer image of the first image can not be transferred onto the imaging medium, so that the normal execution of the job to be processed can be ensured.

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 can detect the transferred image on the transfer belt, particularly the transferred image of the first image, when the job to be processed and the first image form the transferred image on the transfer belt. The left CTD sensor and the right CTD sensor transmit the detection result to the processing section. The processing unit judges whether the timing of triggering the color correction is currently reached or not according to the detection result of the CTD. The embodiment of the invention detects the transfer image through the CTD sensor arranged on the transfer belt, thereby facilitating the implementation of the color correction method of the embodiment of the invention. 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 unit may determine whether the timing of triggering color correction is currently reached by combining the ambient temperature and humidity based on the CTD detection result, or the processing unit may determine what color correction mode is adopted or what image is used as the first image according to the ambient temperature and humidity. In addition, a temperature and humidity sensor can be arranged near the LSU to collect the ambient temperature and humidity near the LSU, the processing component can judge whether the time for triggering color correction is reached currently or not by combining the temperature change of the LSU on the basis of the CTD detection result, or the processing component can judge what color correction mode is adopted or what image is used as the first image according to the temperature change of the LSU.

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 printer performs image formation using CMYK four colors, color registration is required before printing the images 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.

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.

Referring to fig. 1 to 4, the embodiment of the invention further provides a color correction method. Referring to fig. 5, a flowchart of a color correction method according to an embodiment of the present invention is provided. The execution subject of the method shown in fig. 5 is an image forming apparatus, more specifically, a process section in the image forming apparatus. As shown in fig. 5, the processing steps of the method include:

101, acquiring a job to be processed. Alternatively, the image forming apparatus may acquire the job to be processed from the electronic apparatus or directly acquire the job to be processed stored in advance by the image forming apparatus. The electronic device may be, for example, a computer, a notebook computer, a mobile phone, a wearable device, a vehicle-mounted device, an intelligent home device, an augmented reality (augmented reality, AR)/Virtual Reality (VR) device, etc., and the embodiment of the present invention does not limit the specific type of the electronic device.

102, Inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed, and/or inserting the first image before/after the specific job page contained in the job to be processed, the first image being used for determining whether to trigger color correction. Optionally, the job to be processed typically includes a plurality of job pages, which may also be referred to as logical pages. In the process of forming images of the plurality of job pages, when adjacent job pages are transferred to physical sheets, it is generally necessary to maintain a certain interval between adjacent physical sheets, which may be referred to as a paper pitch. In some examples, the image forming apparatus may insert a first image in a space between adjacent job pages, the first image having a smaller size than a space between the adjacent job pages in a paper feed direction, wherein the space between the adjacent job pages refers to a distance between a trailing end of a preceding job page and a leading end of a next job page in the paper feed direction (i.e., a transfer direction of the transfer belt), the first image having a smaller height (size) in the paper feed direction (i.e., the transfer direction of the transfer belt) than the space between the adjacent job pages, whereby the first image can be printed onto the transfer belt between the adjacent physical sheets without affecting normal execution of printing onto the physical sheets by the job to be processed, ensuring normal execution of printout by the job to be processed. In some other examples, the first image may be inserted as one job page between adjacent job pages of the job to be processed in a manner equivalent to inserting additional job pages in the job to be processed, also at least one logical page more than the job to be processed. In this way, the first image is inserted, and transfer image formation of the subsequent job page of the job to be processed can be continued after the first image is transferred on the transfer belt. It is understood that the first image may be inserted in the interval of every two job pages of a job to be processed (i.e., the first image is inserted in the interval of all adjacent job pages of the job to be processed), i.e., the first image is inserted in the interval of the first job page and the second job page, the first image is also inserted in the interval of the second job page and the third job page, until the first image is inserted in the interval of every two job pages. In addition, the first image may be inserted before/after the specific job page included in the job to be processed, and the specific job page may be any one of the job pages included in the job to be processed, preferably, the specific job page is the last job page of the job to be processed or the first job page of the job to be processed, for example, the first image is inserted in the interval between the last job page of the current job to be processed and the first job page of the next job to be processed, or the first image is inserted in the interval between the first job page of the current job to be processed and the second job page, or the first image is inserted in the interval between the last job page of the current job to be processed and the last job page of the last job to be processed, or the first image is inserted in the interval between several job pages, for example, the first image is inserted in the interval between the last job page of the current job page and the first job page of the next job to be processed, the first image is not inserted in the interval between the second job page and the third job page, or the first image is inserted in the interval between the third job page and the fourth job page, and all the first images are inserted in turn. Or the first image is inserted only in the interval of partial job pages, for example, the first image is inserted in the interval of the first 30 job pages in one job to be processed, or the first image is inserted in the interval of the middle 40 job pages in one job to be processed, which is not limited in this aspect, in one implementation manner, the first image may also be inserted in a plurality of different intervals of the job to be processed, for example, two jobs to be processed need to be printed at the same time, and the first image is inserted in the interval of the second job to be processed, which is ready to be printed after the first job to be processed is completed. The embodiment of the present application does not limit in any way how to insert the specific form of the first image. The option of how to insert the first image may be set on the panel or on the drive or on other display means, for example, the user may select to insert the first image in the interval of every two job pages of a job to be processed, insert the first image before/after a specific job page included in a job to be processed, insert the first image in the interval of only a part of the job pages, insert the first image in the interval of preparing to print the next job to be processed after each job to be processed is completed, insert the first image in the interval of preparing to print the next job to be processed, or insert the first image in the interval of all or part of the adjacent job pages of the job to be processed, insert the first image in the interval of the middle 40 job pages included in the job to be processed, insert the first image in the interval of preparing to print the second job to be processed after the first job to be processed is completed, or insert the first image in any combination of the above modes, or insert the first image in the interval of all or part of adjacent job pages included in the job to be processed, or insert the first image in the specific job page included in the job to be processed, for example, insert the first image in the interval of the middle 40 job pages included in the specific job to be printed after the first job to be printed.

Further, the first image may be inserted into a part or all of the job pages in the job to be processed, and further, the first image may be inserted into a blank part in at least one of the job pages in the job to be processed, the first image may be formed on the job page, whether a condition for triggering color correction is reached is judged based on a detection result of the first image on each of the job pages, for example, the first image is formed on the first job page, or the first image is formed on the third job page, or the first image is formed at intervals of several job pages, and whether the condition for triggering color correction is reached is judged based on a detection result of the first image formed on the job page.

In addition, the first image may be inserted into a part or all of the pages of the job to be processed, further, the first image may be inserted into a blank part in at least one of the pages of the job to be processed, further, the first image may be formed on the page of the job, for example, on the page of the first job to the page of the thirty-th job (page number range is 1 to 30), or on the page of the thirty-th job to the page of the fortieth job (page number range is 30 to 40), or on the page of the fifty-th job to the page of the sixty job (page range is 50 to 60), the first image may be inserted into a blank part in all of the pages of the job to be processed, and the first image may be inserted into a blank part before/after the page of the specific job included in the job to be processed, and the page of the specific job may be any of the page included in the job to be processed, preferably, the page of the specific job is the last page of the job to be processed or the page of the first job to be processed, or the blank part of the page of the job to be processed, for example, the first image is inserted into the blank part of the first image in the first part of the page of the job to be processed. Embodiments of the present invention may also be any combination of the above, such as inserting the first image on both the thirty-th to fortieth job pages (page number range 30-40) and on the blank portion in the last job page, as the present invention is not limited in this regard.

103, A detection result of a transferred image of the first image formed on the image carrier is acquired. After the image forming apparatus inserts the first image in the interval of the adjacent job pages of the job to be processed, the first image enters the image forming flow along with the job to be processed. When the first image forms a transferred image on the image carrier, a CTD sensor provided to the image carrier may detect the transferred image of the first image and generate a detection result. The CTD sensor transmits the detection result to the processing section. Alternatively, the first image may be imaged only on the image carrier, but not transferred to the imaging medium.

104, Judging whether the detection result reaches the condition triggering color correction. Alternatively, the detection result may include a color shift value or a patch density error value of a transferred image of the first image formed on the image carrier. The image forming apparatus may determine whether a condition for triggering color correction is reached based on the chromatic shift value or the patch density error value in the detection result. If so, step 105 is performed.

The color shift is used to indicate the positional shift of the color to be corrected with respect to the reference color, and when ACR correction is performed, if a green image is formed using, for example, yellow and cyan, the formed image is decomposed into two colors, that is, the other color (C, M, Y) to be corrected is equivalent to the reference color (K) color, that is, the color shift, and ACR correction is performed.

The patch density value is used to indicate an error of the density value of the formed transfer image with respect to the target reference density.

105, If so, the image forming apparatus performs color correction. Alternatively, when the detection result sent by the CTD sensor reaches the condition of triggering color correction, the image forming apparatus may first suspend printing of the remaining job pages of the job to be processed to perform color correction, or the image forming apparatus may execute color correction after all printing is completed on the job to be processed, or understandably, it may also determine whether to immediately execute color correction based on the number of remaining job pages to be processed corresponding to the job to be processed, first complete printing of the remaining job pages to be processed corresponding to the job to be processed when the number of remaining job pages to be processed is small (less than a certain threshold, for example, 10 pages), then execute color correction when the number of remaining job pages to be processed is large (greater than a certain threshold, for example, 10 pages), and then complete printing of the remaining job pages to be processed corresponding to the job to be processed. The method of the embodiment of the invention can trigger color correction in time according to the detection result of the image inserted in the interval of the adjacent job pages on the transfer belt in the printing process, thereby ensuring the timeliness of the image forming equipment for executing the color correction method and ensuring the image quality effect of the image output by the image forming equipment.

Referring to fig. 6, a flowchart of another color correction method according to an embodiment of the present invention is provided. As shown in fig. 6, the processing steps of the method include:

201, the image forming apparatus acquires a job to be processed.

202, The image forming apparatus determines a target correction mode from among a plurality of correction modes. Alternatively, the image forming apparatus may set a plurality of correction modes in advance, and each correction mode may be associated with at least one correction trigger image. For example, a patch density correction mode and a chromatic shift value correction mode may be set. The patch density correction mode and the chromatic shift value correction mode may be associated with at least one correction trigger image, respectively. The patch density correction mode judges whether or not a condition for triggering color correction is reached by detecting a patch density of a transfer image formed by the first image. For example, when the patch density of the formed transfer image deviates from a pre-stored preset color density, density correction is required so that the patch density of the formed transfer image is within a preset range, the preset color density may be stored in advance in a storage unit of a processing section of the image forming apparatus, or may be set by a panel of the image forming apparatus or the like, and the application is not limited thereto, and the color shift value correction mode judges whether or not a condition for triggering color correction is reached by detecting the color shift value of the transfer image formed by the first image.

In the embodiment of the present invention, after the image forming apparatus acquires the job to be processed, the image forming apparatus may determine the target correction mode from among the plurality of correction modes. Alternatively, the image forming apparatus may determine the target correction mode from among the plurality of correction modes according to one or more of the current environmental temperature and humidity, the number of printed pages of the job to be processed, whether the developing assembly is replaced, and the temperature change of the laser scanning unit.

For example, judging whether or not the temperature and humidity of the environment in which the image forming apparatus is located reach a preset threshold, performing at least one of ACR correction and density correction when the preset threshold is reached, for example, performing both density correction and ACR correction when the environment temperature is detected to be greater than 40 ℃ and the humidity is detected to be greater than 60% when the image forming apparatus is started; or alternatively

Judging whether the accumulated number of printing pages of the job to be processed exceeds a preset threshold, and performing at least one of ACR correction and density correction when the preset threshold is reached, for example, performing density correction and ACR correction simultaneously when more than 1000 pages are accumulated for color printing; or alternatively

When it is determined that the developing assembly is replaced with a new developing assembly, at least one of ACR correction and concentration correction is performed, for example, when at least one of the C developing assembly, the M developing assembly, the Y developing assembly, and the K developing assembly is replaced with a new developing assembly, concentration correction and ACR correction are simultaneously performed; or alternatively

At least one of ACR correction and density correction is performed when it is determined whether or not the temperature change of the laser scanning unit reaches a preset threshold, for example, ACR correction is performed when it is detected that the temperature change of the laser scanning unit exceeds 5 ℃.

It will be appreciated that the target correction pattern (i.e., at least one of the density correction, ACR correction) may also be determined from a plurality of correction patterns in combination with one or more of the current ambient temperature and humidity, the number of printed pages of the job to be processed, whether the developing assembly is replaced, and the temperature change of the laser scanning unit, and the corresponding correction trigger image may be determined based on the target correction pattern.

203, The image forming apparatus determines a first image for insertion in the interval of part or all of the adjacent job pages of the job to be processed from at least one correction trigger image associated with the target correction pattern, and/or determines a first image for insertion before/after a specific job page included in the job to be processed from at least one correction trigger image associated with the target correction pattern.

204, The image forming apparatus inserts the first image into the interval of part or all of the adjacent job pages of the job to be processed, and/or inserts the first image before/after the specific job page included in the job to be processed. It is understood that the first image may be inserted in the interval of every two job pages of a job to be processed (i.e., the first image is inserted in the interval of adjacent job pages of the job to be processed), i.e., the first image is inserted in the interval of the first job page and the second job page, the first image is also inserted in the interval of the second job page and the third job page, until the first image is inserted in the interval of every two job pages. In addition, the first image may be inserted before/after the specific job page included in the job to be processed, and the specific job page may be any one of the job pages included in the job to be processed, preferably, the specific job page is the last job page of the job to be processed or the first job page of the job to be processed, for example, the first image is inserted in the interval between the last job page of the current job to be processed and the first job page of the next job to be processed, or the first image is inserted in the interval between the first job page of the current job to be processed and the second job page, or the first image is inserted in the interval between the last job page of the current job to be processed and the last job page of the last job to be processed, or the first image is inserted in the interval between several job pages, for example, the first image is inserted in the interval between the last job page of the current job page and the first job page of the next job to be processed, the first image is not inserted in the interval between the second job page and the third job page, or the first image is inserted in the interval between the third job page and the fourth job page, and all the first images are inserted in turn. Or the first image is inserted only in the interval of partial job pages, for example, the first image is inserted in the interval of the first 30 job pages in one job to be processed, or the first image is inserted in the interval of the middle 40 job pages in one job to be processed, which is not limited in this aspect, in one implementation manner, the first image may also be inserted in a plurality of different intervals of the job to be processed, for example, two jobs to be processed need to be printed at the same time, and the first image is inserted in the interval of the second job to be processed, which is ready to be printed after the first job to be processed is completed. The embodiment of the present application does not limit in any way how to insert the specific form of the first image. The specific way of letting the user choose how to insert the first image may be provided on the panel or on the drive, for example, the user may choose to insert the first image in the interval of every two job pages of a job to be processed, insert the first image in the interval of the middle 40 job pages of a job to be processed before/after the specific job pages included in the job to be processed, insert the first image in the interval of only part of the job pages, insert the first image in the interval of the next job to be processed after each job to be processed is completed, or insert the first image in the interval of the last job page of the job to be processed, or any combination of the above ways, that is, insert the first image in the interval of all or part of the adjacent job pages of the job to be processed, or insert the first image in the specific job pages included in the job to be processed, for example, insert the first image in the interval of the middle 40 job pages of a job to be processed is selected, and insert the first image in the interval of the second job to be processed after the first job to be processed is completed (i.e. insert the first image after the last job page of the job to be processed).

205, The image forming apparatus acquires a detection result of a transferred image of the first image formed on the image carrier, the detection result including a color misregistration value or a patch density error value of the transferred image.

206, The image forming apparatus judges whether or not the color misregistration value or the patch density error value of the transferred image reaches a condition that triggers color correction.

207, If so, performing color correction.

According to the embodiment of the invention, the target correction mode is determined through one or more of the current environment temperature and humidity, the number of printed pages of the job to be processed, whether the developing assembly is replaced or not and the temperature change of the laser scanning unit, so that the selected correction mode and the first image added into the page interval of the adjacent job can be more matched with the job to be processed at present, and the determined trigger color correction time is more reasonable.

Further, in the embodiment of the present invention, the first image inserted into the job to be processed has a preset color patch density or color patch position. If the image quality of the image output by the image forming device is good, the color register offset value or the color patch density error value acquired by the CTD sensor is within a preset range value. If the color register offset value or the patch density error value acquired by the CTD sensor exceeds a preset range value, it may be determined that a condition triggering color correction is currently reached, and the image forming apparatus may perform color correction. In the embodiment of the invention, the color register offset value or the color patch density error value of the current transfer image can represent the imaging quality of the current output image of the image forming device. Therefore, the timing of triggering color correction determined according to the color register offset value or the color patch density error value of the current transfer image is also more timely and accurate, and the situation that the image quality of the image output by the image forming equipment is poor but the color correction is not triggered yet is avoided. Further, after determining to perform color correction, the image forming apparatus may perform color correction on the remaining job of the current job to be processed or may perform color correction after the execution of the current job to be processed is completed, and it may be understood that whether to immediately perform color correction may also be determined based on the number of pages of the remaining job to be processed corresponding to the job to be processed, and when the number of pages of the remaining job to be processed is small (less than a certain threshold, for example, 10 pages), printing of pages of the remaining job to be processed corresponding to the current job to be processed is completed first and then color correction is performed, and when the number of pages of the remaining job to be processed is large (greater than a certain threshold, for example, 10 pages), printing of pages of the remaining job to be processed corresponding to the current job to be processed is completed after the color correction is completed.

Referring to fig. 7, a schematic diagram of dividing a complete corrected trigger image into a plurality of sub-images is provided according to an embodiment of the present application. As shown in fig. 7, the entire correction trigger image may be stored in advance in the storage unit of the image forming apparatus. Alternatively, the complete correction trigger image may include a left correction trigger image and a right correction trigger image, or only the left correction trigger image or the right correction trigger image may be selected as the correction trigger image, for example, the density correction is performed using the left correction trigger image. The left correction trigger image and the right correction trigger image are distributed on two sides of the operation page along the length direction of the operation page. When the complete correction trigger image is image-formed as a job page, transfer images of the left correction trigger image and the right correction trigger image can be detected by the left CTD sensor and the right CTD sensor, respectively. In the example given in fig. 7, the complete correction trigger image may be divided into several sub-images, each sub-image comprising left and right color patches along the imaging medium transport direction, the sub-images having a height less than the spacing between adjacent job pages. In the related art, the interval of adjacent job pages of a job to be processed is blank. In the example given in fig. 8, after the job to be processed is acquired, a sub-image may be inserted in the interval of each adjacent job page of the job to be processed, the sub-image being the above-described first image. The first image may be pre-stored in a memory of the image forming apparatus, and the pre-stored first image may be directly used as the first image, and it may be understood that a specific area may be selected as the first image according to a set algorithm, for example, a middle portion of the complete first image is selected as the first image.

In some embodiments, after dividing the complete correction trigger image into several sub-images, each sub-image may be numbered. Accordingly, the sub-images can be inserted one by one in the interval of the adjacent job pages of the job to be processed according to the numbering order of the sub-images. For example, a sub-image with the number 1 is inserted in the interval between the job page ① and the job page ②, a sub-image with the number 2 is inserted in the interval between the job page ② and the job page ③, and so on, until a sub-image is inserted in each sub-interval of the job to be processed. In some embodiments, after the image forming apparatus acquires the detection results of all the sub-images inserted into the job to be processed or the detection results of the partial sub-images required for the completion of the color correction, it is determined whether the condition for triggering the color correction is reached according to the acquired detection results. According to the embodiment of the invention, the sub-image for triggering color correction is inserted into the interval of the adjacent job pages of the job to be processed, so that the time for triggering color correction can be determined under the condition that normal execution of the job to be processed is not influenced.

Referring to fig. 9, another schematic diagram of inserting a first image in an interval between adjacent job pages of a job to be processed according to an embodiment of the present invention is provided. In the example given in fig. 9, the complete correction trigger image may be inserted as a job page between adjacent job pages of the job to be processed, and the complete correction trigger image is the first image. As shown in fig. 9, a complete correction trigger image may be inserted between the job page ① and the job page ②, which is a job page, and a certain interval is set between the job page and the job page ① and the job page ②. Of course, in the embodiment of the invention, a plurality of complete correction trigger images can be inserted into the to-be-processed operation. In the embodiment of the invention, the correction trigger image is used as the job page to be inserted into the image to be processed, and the transfer of the job to be processed can be continued after the transfer of the correction trigger image is completed, so that the job to be processed is not required to be interrupted, and the execution of the job to be processed is not influenced.

Corresponding to the method, an embodiment of the present invention provides an image forming apparatus. Referring to fig. 10, a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention is provided. As shown in fig. 10, the image forming apparatus includes: a job acquisition module 301, a color correction triggering module 302, an image forming module 303, and a color correction execution module 304, the image forming module 303 including: the device comprises a laser scanning unit, a developing assembly and an image carrier, wherein a detection device is arranged on the image carrier; wherein,

A job acquisition module 301, configured to acquire a job to be processed;

a color correction triggering module 302, configured to insert a first image in the interval of some or all of the adjacent job pages of the job to be processed, and/or insert the first image before/after a specific job page included in the job to be processed, where the first image is used to determine whether to trigger color correction;

an image forming module 303 for forming a transferred image of the first image on the image carrier by the laser scanning unit and the developing assembly; a detecting device, configured to obtain a detection result of a transfer image formed by the first image on the image carrier and send the detection result to the color correction triggering module 302;

The color correction triggering module 302 is further configured to determine whether the detection result reaches a condition for triggering color correction;

The color correction execution module 304 is configured to execute color correction when a condition triggering color correction is reached.

Optionally, the color correction triggering module 302 is specifically configured to: dividing the complete correction trigger image into a plurality of sub-images, wherein the height of each sub-image is smaller than the interval between adjacent operation pages along the conveying direction of the imaging medium; and inserting the sub-image into the interval of part or all of the adjacent job pages of the job to be processed, and taking the sub-image as a first image. According to the embodiment of the invention, the sub-image for triggering color correction is inserted into the interval of part or all of the adjacent job pages of the job to be processed, so that the time for triggering color correction can be determined under the condition that normal execution of the job to be processed is not influenced.

Or inserting the complete correction trigger image as one job page between part or all of adjacent job pages of the job to be processed, and taking the complete correction trigger image as a first image. In the embodiment of the invention, the correction trigger image is used as the job page to be inserted into the image to be processed, and the transfer of the job to be processed can be continued after the transfer of the correction trigger image is completed, so that the job to be processed is not required to be interrupted, and the execution of the job to be processed is not influenced.

Or dividing the complete correction trigger image into a plurality of sub-images, wherein the height of each sub-image is smaller than the interval between adjacent operation pages along the conveying direction of the imaging medium; the sub-image is inserted before/after a specific job page included in the job to be processed, and the sub-image is taken as a first image. In the embodiment of the invention, the correction trigger image is inserted before/after the specific job page contained in the job to be processed, the job to be processed is not required to be interrupted, and the execution of the job to be processed is not influenced.

Or inserting the complete correction trigger image as a job page before/after a specific job page included in the job to be processed, and taking the complete correction trigger image as a first image. In the embodiment of the invention, the correction trigger image is inserted before/after the specific job page contained in the job to be processed, the job to be processed is not required to be interrupted, and the execution of the job to be processed is not influenced. Optionally, the color correction triggering module 302 is specifically configured to: and judging whether the color register deviation value or the color lump concentration deviation value of the transfer image formed by the first image on the image carrier reaches the condition of triggering color correction. In the embodiment of the invention, the color register offset value or the color patch density error value of the current transfer image can represent the imaging quality of the current output image of the image forming device. Therefore, the timing of triggering color correction determined according to the color register offset value or the color patch density error value of the current transfer image is also more timely and accurate, and the situation that the image quality of the image output by the image forming equipment is poor but the color correction is not triggered yet is avoided.

Optionally, the color correction triggering module 302 is specifically configured to: and judging whether the condition triggering color correction is reached or not according to the detection results of all the first images or the detection results of part of the first images inserted before/after part or all of the adjacent job pages of the job to be processed and/or the specific job pages contained in the job to be processed. Optionally, the color correction triggering module 302 is further configured to: inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed, and/or determining a target correction mode from a plurality of correction modes before the first image is inserted before/after the specific job page contained in the job to be processed, wherein each correction mode is associated with at least one correction trigger image;

The first image for insertion in the interval of part or all of the adjacent job pages of the job to be processed is determined from at least one correction trigger image associated with the target correction pattern, and/or the first image for insertion before/after the specific job page included in the job to be processed is determined from at least one correction trigger image associated with the target correction pattern.

Optionally, the color correction triggering module 302 is specifically configured to: and determining a target correction mode from a plurality of correction modes according to one or more of the current environment temperature and humidity, the number of printing pages of the to-be-processed job, whether the developing assembly is replaced or not and the temperature change of the laser scanning unit. According to the embodiment of the invention, the target correction mode can be determined from the plurality of correction modes through one or more of the current environment temperature and humidity, the number of printed pages of the job to be processed, whether the developing assembly is replaced or not and the temperature change of the laser scanning unit, so that the selected correction mode and the first image added with the interval of the adjacent job page are more matched with the current job to be processed, and the determined trigger color correction time is more reasonable.

Optionally, the color correction execution module 304 is specifically configured to: firstly suspending printing of the rest job pages of the job to be processed to execute color correction; or performing color correction after printing of the job to be processed is finished; or determining whether to immediately execute color correction according to the number of the remaining print job pages to be processed corresponding to the job to be processed.

The image forming apparatus of the embodiment of the present invention can execute the color correction method related to the above-described method embodiment. For portions of the image forming apparatus not described in detail in the embodiment of the present invention, reference may be made to the description of the embodiments shown in fig. 2 to 9. The implementation process and the technical effect of this technical solution are described in the embodiments shown in fig. 2 to 9, and are not described herein.

It should be understood that the division of the respective modules of the image forming apparatus shown in fig. 10 is merely a division of a logic function, and may be fully or partially integrated into one physical entity or may be physically separated. And these modules may all be implemented in software in the form of calls by the processing element; or can be realized in hardware; it is also possible that part of the modules are implemented in the form of software called by the processing element and part of the modules are implemented in the form of hardware. In addition, all or part of the modules can be integrated together or can be independently implemented. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in a software form.

For example, the modules above may be one or more integrated circuits configured to implement the methods above, such as: one or more Application SPECIFIC INTEGRATED Circuits (ASIC), or one or more microprocessors (DIGITAL SINGNAL Processor (DSP), or one or more field programmable gate arrays (Field Programmable GATE ARRAY; FPGA), etc. For another example, the modules may be integrated together and implemented in the form of a System-On-a-Chip (SOC).

Referring to fig. 11, a schematic structural view of another image forming apparatus according to an embodiment of the present invention is provided. As shown in fig. 11, the image forming apparatus is represented in the form of a general-purpose computing apparatus. Components of a computer device may include, but are not limited to: one or more processors 410, a communication interface 420, a memory 430, a communication bus 440 that connects the various system components, including the processor 410, the communication interface 420, and the memory 430.

The communication bus 440 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 430 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 430 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 invention.

The processor 410 executes various functional applications and data processing by running programs stored in the memory 430, for example, to implement the color correction method provided by the embodiment of the present invention.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the device where the computer readable storage medium is located is controlled to execute the color correction method of the embodiment of the invention when the program runs.

Any combination of one or more computer readable media may be utilized as the above-described computer readable storage 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.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

Those of ordinary skill in the art will appreciate that the various elements and algorithm steps described in the embodiments disclosed herein can be implemented as a combination of electronic hardware, computer software, and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein. The foregoing is merely exemplary embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the present application. The protection scope of the application is subject to the protection scope of the claims.

Claims

1. A color correction method, comprising:

acquiring a job to be processed;

inserting a first image in the interval of part or all of adjacent job pages of the job to be processed, and/or inserting the first image before/after a specific job page contained in the job to be processed, wherein the first image is used for determining whether to trigger color correction;

if so, color correction is performed.

2. The method according to claim 1, wherein the inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed and/or before/after a specific job page included in the job to be processed comprises:

3. The method of claim 1, wherein determining whether the detection result reaches a condition that triggers color correction comprises:

4. The method of claim 1, wherein determining whether the detection result reaches a condition that triggers color correction comprises:

5. The method according to claim 1, wherein the inserting a first image in the interval of part or all of the adjacent job pages of the job to be processed and/or before/after inserting the first image before/after a specific job page contained in the job to be processed, the method further comprises:

6. The method of claim 5, wherein determining a target correction pattern from a plurality of correction patterns comprises:

7. The method of claim 1, wherein the performing color correction if achieved comprises:

8. An image forming apparatus, comprising: a job acquisition module, a color correction triggering module, an image forming module, and a color correction execution module, the image forming module comprising: the device comprises a laser scanning unit, a developing assembly and an image carrier, wherein a detection device is arranged on the image carrier; wherein,

The job acquisition module is used for acquiring a job to be processed;

9. The device according to claim 8, wherein the color correction triggering module is specifically configured to:

10. The device according to claim 8, wherein the color correction triggering module is specifically configured to:

11. The device according to claim 8, wherein the color correction triggering module is specifically configured to:

12. The apparatus of claim 8, wherein the color correction triggering module is further configured to:

13. The device according to claim 12, wherein the color correction triggering module is specifically configured to:

14. The device according to claim 8, wherein the color correction execution module is specifically configured to:

15. An image forming apparatus, comprising: the device comprises a laser scanning unit, a developing assembly and an image carrier, wherein a detection device is arranged on the image carrier; further comprises:

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 1-7.

16. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 7.