Longitudinal correction error adjustment method, image forming device, and storage medium

Abstract

The present invention discloses a longitudinal correction error adjustment method, an image forming device, and a storage medium. The method includes obtaining a first image used to represent a correction image, and controlling the image forming device to perform imaging of the first image; controlling a detection device to perform detection on the first image to obtain a detection result, and calculating a longitudinal position error based on the detection result; and, based on the longitudinal position error, performing inter-zone adjustment on the image data of the second image to ensure normal imaging of the second image when controlling the image forming device to perform imaging of a second image used to represent a job to be printed. The present invention calculates the longitudinal position error from the detection result of the detected first image, and uses the longitudinal position error to perform inter-zone adjustment on the image data of the second image. This eliminates periodic jitter generated by gears in the transmission system, avoids longitudinal color deviation, and further improves the user's high-precision image experience.

Description

Technical Field

[0001] The present invention relates to the field of image forming technology, and in particular to a longitudinal correction error adjustment method, an image forming device, and a storage medium. Background Art

[0002] Color image forming devices print color images on paper using four colors: yellow, magenta, cyan, and black. They also perform automatic color registration (registration) to precisely align desired positions on the paper, or perform density correction to ensure the printed image density meets user requirements. Automatic color registration (registration) typically involves printing a test image and detecting it using an image density sensor. Based on the detected values, adjustments are made for errors in the longitudinal direction (the direction in which the intermediate transfer body, i.e., the intermediate transfer belt, is transported) and in the horizontal direction (perpendicular to the direction in which the intermediate transfer belt is transported).

[0003] In the prior art, methods for adjusting longitudinal color registration errors involve adjusting the overall position of the image, such as adjusting the top and left margins to offset the image on the paper (e.g., up, down, left, or right), or adjusting the horizontal synchronization signal to adjust the longitudinal error of the image. Both of these methods adjust the longitudinal color registration error of the entire image. If the image has localized vertical jitter, resulting in varying degrees of stretching or compression at different locations, the printed image will still be stretched or compressed due to the inability to eliminate the effects of the localized jitter, resulting in partial image distortion or substandard image quality. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a longitudinal correction error adjustment method, an image forming device, and a storage medium, which are used to solve the technical problem that the overall printed image is stretched or compressed due to the inability to eliminate the influence of local jitter, and there is local image distortion or the image quality does not meet the requirements.

[0005] According to a first aspect of the present invention, there is provided a method for adjusting a longitudinal correction error, which is executed in an image forming device, the method comprising:

[0006] Acquiring a first image and controlling the image forming device to perform imaging of the first image, wherein the first image is used to represent a correction image for adjusting a longitudinal correction error;

[0007] controlling a detection device to detect the first image to obtain a detection result, and calculating a position error in a longitudinal direction based on the detection result;

[0008] When controlling the image forming device to perform imaging of a second portrait based on the position error in the longitudinal direction, the portrait data of the second portrait is adjusted between partitions so that the second portrait can be imaged normally, wherein the second portrait is used to represent the job to be printed.

[0009] The longitudinal correction error adjustment method of the present invention calculates the detection result of the detected first image to obtain the position error in the longitudinal direction, and uses the position error in the longitudinal direction to adjust the image data of the second image within the partition. It can eliminate the color error caused by the periodic jitter of the gears on the transmission system of the imaging component of the image forming device driving the four colors, avoid the longitudinal color deviation, and further improve the user's high-precision image experience.

[0010] In some embodiments, the detection device comprises:

[0011] Image density sensor or scanner.

[0012] In some embodiments, the method further comprises:

[0013] When no detection result is obtained by controlling the detection device to detect the first image, a preset position error or a position error in the longitudinal direction calculated last time is used as the detection result.

[0014] In some embodiments, the first image is designed as a single-color toner pattern group composed of at least one color consisting of straight lines extending in the horizontal direction, separated in the longitudinal direction on the intermediate transfer body to form a circumferential length of the photoreceptor greater than or equal to the toner pattern.

[0015] In some embodiments, the first image includes a toner pattern group of at least one color among a cyan toner pattern group, a magenta toner pattern group, a yellow toner pattern group, and a black toner pattern group.

[0016] In some embodiments, when controlling the image forming device to perform imaging of the second image based on the position error in the longitudinal direction, performing inter-regional adjustment on the image data of the second image includes:

[0017] Controlling the detection device to perform detection on the first image and dividing the detection result obtained into intervals;

[0018] Determining whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction;

[0019] If there is image fluctuation in the longitudinal direction in the interval, the row data in the second image is adjusted.

[0020] In some embodiments, if there is image fluctuation in the longitudinal direction within the interval, adjusting the row data in the second image includes:

[0021] If there is a longitudinal stretch of the image in the interval, the row data in the interval corresponding to the second image is deleted using a first preset method; or

[0022] If there is image compression in the longitudinal direction in the interval, a second preset method is used to increase the row data in the interval corresponding to the second image.

[0023] In some embodiments, the deleting row data in the interval corresponding to the second portrait using the first preset method includes:

[0024] Using an average deletion method to delete the row data in the interval corresponding to the second portrait; or

[0025] The adding of row data in the interval corresponding to the second portrait by using the second preset method includes:

[0026] The row data in the interval corresponding to the second portrait is increased by using an average insertion method or supplementing repeated operation data.

[0027] In some embodiments, the method further comprises:

[0028] When the detection device is the image density sensor, the image forming device performs imaging of the first image on the intermediate transfer body or printing medium, and controls the image density sensor to perform detection of the first image to obtain a detection result; or when the detection device is the scanner, the image forming device controls the scanner to perform detection of the first image to obtain a detection result.

[0029] According to a second aspect of the present invention, there is provided an image forming apparatus comprising:

[0030] a controller configured to acquire a first image and control the image forming device to perform imaging of the first image, wherein the first image is used to represent a correction image for adjusting a longitudinal correction error;

[0031] a detection device, the detection device being controlled by the controller to perform detection on the first image to obtain a detection result;

[0032] The controller is also used to calculate the position error in the longitudinal direction based on the detection result, and based on the position error in the longitudinal direction, when controlling the image forming device to perform imaging of the second portrait, adjust the portrait data of the second portrait between partitions so that the second portrait can be imaged normally, wherein the second portrait is used to represent the job to be printed.

[0033] In some embodiments, the controller is further configured to adjust the image data of the second image between partitions when controlling the image forming device to perform imaging of the second image based on the position error in the longitudinal direction, including:

[0034] The controller is used to control the detection device to perform detection on the first portrait and divide the detection result into intervals;

[0035] The controller is configured to determine whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction;

[0036] The controller is configured to adjust the row data in the second image when there is image fluctuation in the longitudinal direction in the interval.

[0037] In some embodiments, the controller is configured to adjust the row data in the second image when there is image fluctuation in the longitudinal direction in the interval, comprising:

[0038] The controller is configured to delete the row data in the interval corresponding to the second image using a first preset method when there is image stretching in the longitudinal direction in the interval; or

[0039] The controller is configured to use a second preset method to increase the row data in the interval corresponding to the second image when there is image compression in the longitudinal direction of the interval.

[0040] In some embodiments, the controller using a first preset method to delete row data in the interval corresponding to the second portrait includes:

[0041] The controller deletes the row data in the interval corresponding to the second portrait by using an average deletion method or deleting duplicate operation data; or

[0042] The controller adopting the second preset method to add row data in the interval corresponding to the second portrait includes:

[0043] The controller increases the row data in the interval corresponding to the second portrait by using an average insertion method or supplementing repeated operation data.

[0044] According to a third aspect of the present invention, there is provided an image forming apparatus comprising:

[0045] at least one processor; and

[0046] a memory communicatively connected to the at least one processor; wherein,

[0047] The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the longitudinal correction error adjustment method of the first aspect.

[0048] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the longitudinal correction error adjustment method of the first aspect when executed.

[0049] Compared with the prior art, the longitudinal correction error adjustment method, image forming device, and storage medium of the present invention calculate the detection results of the detected first image to obtain the position error in the longitudinal direction, and use the position error in the longitudinal direction to adjust the image data of the second image within the partition. This can eliminate the color error caused by the periodic jitter of the gears on the transmission system of the image forming device that drives the four-color imaging components, avoid the occurrence of longitudinal color deviation, and further improve the user's high-precision image experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A first structural schematic diagram of an image forming apparatus according to an embodiment of the present invention;

[0051] Figure 2 A second structural schematic diagram of an image forming apparatus according to an embodiment of the present invention;

[0052] Figure 3 A third structural schematic diagram of an image forming apparatus according to an embodiment of the present invention;

[0053] Figure 4 This is a first flow chart of a longitudinal correction error adjustment method according to an embodiment of the present invention;

[0054] Figure 5 This is a second flow chart of a longitudinal correction error adjustment method according to an embodiment of the present invention;

[0055] Figure 6 This is a flow chart of a position error in the longitudinal direction using a preset value or a last calculated value according to an embodiment of the present invention;

[0056] Figure 7This is a first flow chart of performing inter-region adjustment on the image data of the second image based on the position error in the longitudinal direction according to an embodiment of the present invention;

[0057] Figure 8 A schematic diagram of a first longitudinal wavy line drawing according to an embodiment of the present invention;

[0058] Figure 9 A schematic diagram of a preset table according to an embodiment of the present invention;

[0059] Figure 10 A second flow chart of performing inter-region adjustment on the image data of the second image based on the position error in the longitudinal direction according to an embodiment of the present invention;

[0060] Figure 11 A schematic diagram of a second longitudinal wavy line drawing according to an embodiment of the present invention;

[0061] Figure 12 This is a flow chart of adjusting row data in the second portrait according to an embodiment of the present invention;

[0062] Figure 13 Schematic diagram of a longitudinal fluctuation deviation repair process according to one embodiment of the present invention;

[0063] Figure 14 FIG. 1 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION

[0064] The present invention will be further described in detail below with reference to the accompanying drawings.

[0065] The embodiment of the present invention provides an image forming device, including but not limited to a printer, a copier, a fax machine, a scanner, and a multifunction machine that integrates printing, copying, faxing, scanning and other functions into one, etc., which has the function of printing images or text on a printing medium. Figure 1 As shown, in Figure 1 1 mainly shows the portion of an image forming apparatus in which a toner image is transferred onto a recording medium (i.e., a printing medium). The image forming apparatus is a color image forming apparatus and includes four image forming units for forming a yellow toner image, a magenta toner image, a cyan toner image, and a black toner image.

[0066] Each image forming unit includes one of the photosensitive drums 101a to 101d, which serves as a rotating component. The suffixes "a" to "d" in the reference numerals 101a to 101d represent "yellow," "magenta," "cyan," and "black," respectively. That is, photosensitive drum 101a is a photosensitive component for forming a yellow toner image, photosensitive drum 101b is a photosensitive component for forming a magenta toner image, photosensitive drum 101c is a photosensitive component for forming a cyan toner image, and photosensitive drum 101d is a photosensitive component for forming a black toner image. It should be noted that photosensitive drums 101a to 101c may also be collectively referred to as "color photosensitive drums." The definitions of the suffixes a to d also apply to the laser scanners 109a to 109d.

[0067] The photosensitive drum 101d is driven by a first motor 111 (equivalent to the imaging motor K) for the monochrome photosensitive drum via gears; the photosensitive drums 101a to 101c are driven by a second motor 112 (imaging motor YMC) for the color photosensitive drum via gears. The first motor 111 and the second motor 112 can be DC brushless motors. The photosensitive drums 101a to 101c are assembled so that the eccentric components of the rotating shaft of the photosensitive drum and the rotating shaft of the gear cancel each other out, and the cycles of peripheral speed changes caused by the eccentricity of the photosensitive drums 101a to 101c have the same phase. Since the photosensitive drums 101a to 101c are driven by a single second motor 112, the photosensitive drums 101a to 101c rotate in the same phase. Therefore, the photosensitive drums 101a to 101c are rotationally driven while maintaining their phase. The rotation phases of the photosensitive drums 101 a to 101 c are detected by the second phase sensor 122 ; the rotation phase of the photosensitive drum 101 d is detected by the first phase sensor 121 .

[0068] The configuration of the first phase sensor 121 and the second phase sensor 122 is described in more detail below. It can be understood that the first motor and the second motor in the embodiment of the present invention may include one or more motors for driving the photosensitive drums 101a to 101d, that is, each photosensitive drum may be individually provided with a motor for driving its rotation and corresponding gears, and the second phase sensor may include phase sensors for detecting at least one phase of the photosensitive drums 101a to 101d, that is, each photosensitive drum 101a to 101d can be provided with an independent phase sensor to detect the rotation phase. Exemplarily, if the first motor is used to drive the monochrome photosensitive drum 101d via gears, the second motor may refer to a motor that drives at least one of the color photosensitive drums 101a to 101c, that is, the second motor may include at least one motor for driving the color photosensitive drums 101a to 101c respectively, the first phase sensor is used to detect the rotation phase of the monochrome photosensitive drum, and the second phase sensor may be used to detect the rotation phase of at least one of the color photosensitive drums 101a to 101c, that is, the second phase sensor may include at least one phase sensor for detecting the rotation phase of at least one of the color photosensitive drums 101a to 101c.

[0069] Each developing unit (not shown in the figure; one developing unit corresponds to each photosensitive drum) deposits toner (developer) onto the latent image formed on one of the photosensitive drums 101a to 101d, forming a toner image. Thus, the latent image is visualized. The latent image on each of the photosensitive drums 101a to 101d is formed by exposure performed by one of the laser scanners 109a to 109d (LSU) based on an image signal. The toner images formed on the photosensitive drums 101a to 101d, as visible images, are sequentially transferred to a transfer belt 104 rotated by a drive roller 103.

[0070] The toner image transferred to the transfer belt 104 is simultaneously transferred to a recording medium by a transfer roller 105. The recording medium to which the toner image has been transferred is conveyed to a fuser unit 106, which includes a fuser roller driven by a fuser drive motor. In the fuser unit 106, the toner image is fixed to the recording medium by heating.

[0071] In this embodiment of the present invention, upon receiving an image formation job instruction, the image forming apparatus transmits image signals for each color to laser scanners 109a to 109d, thereby forming latent images on photosensitive drums 101a to 101d. The four-color latent images formed on photosensitive drums 101a to 101d are developed by developing units, respectively, forming four-color toner images on photosensitive drums 101a to 101d. The four-color toner images are then transferred to a transfer belt 104, which is rotated by a drive roller 103, so that they overlap.

[0072] Subsequently, the recording medium is conveyed from the paper feed cassette 107 in the direction indicated by arrow P. The toner image formed on the transfer belt 104 is transferred to the recording medium by the transfer roller 105. The toner image transferred to the recording medium is then fixed to the recording medium by the fuser unit 106 under the action of heat and pressure. Thereafter, the recording medium is discharged onto the paper output tray 108.

[0073] In some embodiments, as Figure 2 and Figure 3 As shown, a corresponding counterpoint sensor (CTD sensor) 200 is generally provided on the intermediate transfer belt (i.e., the intermediate transfer body). The CTD sensor is an IDC (image density control) sensor, also known as a color block sensor, a color block concentration sensor, or an image density sensor. The CTD sensor is generally provided on both sides of the intermediate transfer belt to detect the color correction image (i.e., the test image) formed on the transfer belt, so that the controller 300 performs a judgment on the color correction position deviation (i.e., the automatic color registration deviation) and the concentration deviation based on the detection result. The controller 300 stores the judgment result in the memory 400.

[0074] like Figure 2 As shown, the CTD sensor includes a left CTD sensor and a right CTD sensor. The left CTD sensor and the right CTD sensor are arranged on both sides of the transfer belt along the width direction of the transfer belt. When the image to be formed is formed on the transfer belt, the left CTD sensor and the right CTD sensor can detect the transfer image on the transfer belt. Figure 3 As shown, the left CTD sensor and the right CTD sensor send the detection results to the controller 300. Furthermore, the image forming apparatus further includes a temperature and humidity sensor.

[0075] Understandably, if Figure 3 As shown, when the image forming device has a scanning function, a scanner 500 can also be set to perform scanning of the original document. The scanner 500 includes at least a scanning motor for controlling the start and stop of the scan and a contact image sensor (CIS sensor) for scanning the original document to obtain a scanned image. The scanner 500 performs scanning of the original document of the printed color correction image and obtains the detection result, and sends the detection result to the controller 300 so that the controller 300 performs a judgment of the color correction position deviation and the concentration deviation based on the detection result. The controller 300 stores the judgment result in the memory 400.

[0076] In the existing printing process, the image forming device analyzes the print job information and then drives the print engine to output the image, transferring the image information to paper (print medium). Any adjustments to the image content are processed holistically based on specific parameter requirements. There is no specific compensation for the periodic jitter generated by the gears in the transmission system driving the four-color imaging components of the image forming device, resulting in partial image distortion or substandard image quality.

[0077] The embodiment of the present invention provides a longitudinal correction error adjustment method, which is executed in Figure 1-3 The image forming device shown detects the longitudinal fluctuation line drawing printed by the image forming device through the CTD sensor 200, and obtains longitudinal fluctuation deviation data by analyzing the drawing data. During normal printing operation, the longitudinal deviation of the image is repaired according to the longitudinal fluctuation deviation data. This solution can reduce the processing requirements for the transmission system parts of the image forming device that drives the four-color imaging components to a certain extent, and reduce product costs. At the same time, it can reduce the longitudinal color deviation caused by the wear of the parts on the transmission system during the long-term use of the image forming device, and further improve the user's high-precision image experience. Figure 4 As shown, the method includes:

[0078] S100A: Acquire a first image, and control an image forming device to perform imaging of the first image, wherein the first image is used to represent a correction image for adjusting a longitudinal correction error;

[0079] In this embodiment, the first image is sent to the image forming device through the print driver of the PC (Personal Computer), or the image forming device can also obtain the first image from the mobile phone. It is understandable that when the storage unit of the image forming device stores the first image, the first image can also be obtained directly from the image forming device, and the present invention is not limited to this. If the printed first image is a color image, the controller 300 controls the image forming device to print the color image on the printing paper using four colors: yellow, magenta, cyan, and black, and performs automatic color registration (Auto Color Registration, ACR) to accurately align the colors at the required positions on the printing paper. The ACR correction work is to correct the relative positions of the four colors so that the four-color images are accurately aligned, and when the ACR correction work is performed, the image quality is improved. For example, the image forming device uses four colors CMYK to form an image. Before printing the image, color registration is required to align CMY with K color. For example, yellow and cyan are used to form a green image. If there is misalignment in the color registration, the formed image will be decomposed into two colors, so ACR correction is required.

[0080] When it is necessary to correct the registration error in the longitudinal direction in the ACR correction, the controller 300 in the image forming device needs to obtain the correction image (i.e., the first image) of the longitudinal correction error. The controller 300 will obtain the correction image from the image forming device and control the image forming device to perform imaging of the correction image. When the image forming device performs imaging of the correction image, it will form the correction image on the transfer belt or printing medium (such as paper).

[0081] S200A: Control the CTD sensor to perform detection on the first image to obtain a detection result, and calculate a position error in the longitudinal direction based on the detection result;

[0082] In this embodiment, the CTD sensor 200 is used as an example of a detection device to detect the correction image formed on the transfer belt or the printing medium. It can be understood that when the CTD sensor is used to detect the correction image formed on the transfer belt, the controller 300 controls the single-side CTD sensor (i.e., the left CTD sensor or the right CTD sensor) or the double-side CTD sensor (i.e., the left CTD sensor and the right CTD sensor) to detect the data of each positioning color block in the correction image formed on the transfer belt to obtain the corresponding detection result. The CTD sensor 200 sends the detection result to the controller 300. When the controller 300 receives the detection result detected by the CTD sensor 200, it calculates the position error in the longitudinal direction based on the detection result and stores it in the memory 400. When the CTD sensor is used to detect the correction image formed on the printing medium, the CTD sensor can be set in the paper path to detect the data of each positioning color block in the correction image formed on the printing medium to obtain a corresponding detection result. The CTD sensor 200 sends the detection result to the controller 300. When the controller 300 receives the detection result detected by the CTD sensor 200, it will calculate the position error in the longitudinal direction based on the detection result and store it in the memory 400.

[0083] S300A: When controlling the image forming device to perform imaging of a second image based on the position error in the longitudinal direction, performing inter-regional adjustment on the image data of the second image so that the second image is normally imaged, wherein the second image is used to represent the job to be printed.

[0084] In this embodiment, when the image forming device needs to execute printing of a job to be printed, a specific number of pages can be pre-set or the user can actively select the job content to be printed, so that when the controller 300 receives the issued job to be printed (i.e., the second portrait) and controls the image forming device to execute imaging of the second portrait, the controller 300 adjusts the portrait data of the second portrait between partitions according to the calculated position error in the longitudinal direction, so that the image forming device can perform normal imaging when executing imaging of the second portrait.

[0085] The embodiment of the present invention provides a longitudinal correction error adjustment method, which is executed in Figure 1-3 The image forming apparatus shown in the embodiment is different from the above embodiment in that the scanner 500 is used as a detection device to detect the longitudinal fluctuation line drawing (correction image), and the longitudinal fluctuation deviation data is obtained by analyzing the drawing data. Figure 5 As shown, the method includes:

[0086] S100B: Acquire a first image, and control the image forming device to perform imaging of the first image, wherein the first image is used to represent a correction image for adjusting a longitudinal correction error;

[0087] In this embodiment, the original document (first image) is scanned by the scanner 500 as a detection device, that is, the original document is placed on the scanner 500 and the controller 300 controls the scanner 500 to scan the original document to obtain a scanned image. The scanner 500 scans the printed original document and obtains a detection result, and sends the detection result to the controller 300 so that the controller 300 performs a longitudinal correction error judgment based on the detection result. Specifically, the scanner 500 performs automatic color registration (Auto Color Registration, ACR) to accurately align the color registration at the required position on the printed paper. The ACR correction work is to correct the relative positions of the four colors so that the images of the four colors are accurately aligned, and when the ACR correction work is performed, the image quality is improved.

[0088] When the scanner 500 needs to adjust the position error in the longitudinal direction, it first needs to obtain a correction image (i.e., a first image) for adjusting the longitudinal correction error. The controller 300 obtains the correction image and controls the image forming device to perform imaging of the correction image to obtain the original that the scanner needs to scan, so that the scanner performs scanning of the printed original and obtains the detection result to adjust the position error in the longitudinal direction. It can be understood that when the obtained original is a printed original, there is no need for the image forming device to obtain the correction image for adjusting the longitudinal correction error and perform printing to obtain the original to be scanned, and the original can be directly scanned.

[0089] Exemplarily, the first image may be set as a color block group consisting of multiple horizontal color blocks of the same color. By detecting the first image of the longitudinal correction error, the correction error in the longitudinal direction (transmission direction of the intermediate transfer belt) can be better detected.

[0090] S200B: controlling the scanner to detect the first image to obtain a detection result, and calculating a position error in the longitudinal direction based on the detection result;

[0091] In this embodiment, the scanner 500 is used as an example of a detection device to detect the correction image, that is, the scanner 500 will detect the data of each positioning color block in the correction image to obtain the corresponding detection result during the process of correcting the scanned image to form the correction image. The scanner 500 sends the detection result to the controller 300. When the controller 300 receives the detection result detected by the scanner 500, it will calculate the position error in the longitudinal direction based on the detection result and store it in the memory 400.

[0092] S300B: When controlling the image forming device to perform imaging of the second portrait based on the position error in the longitudinal direction, the portrait data of the second portrait is adjusted between partitions so that the second portrait is normally imaged, wherein the second portrait is used to represent the job to be printed.

[0093] In this embodiment, when the image forming device needs to execute printing of a job to be printed, a specific number of pages can be pre-set or the user can actively select the job content to be printed, so that when the controller 300 receives the issued job to be printed (i.e., the second portrait) and controls the image forming device to execute imaging of the second portrait, the controller 300 adjusts the portrait data of the second portrait between partitions according to the calculated position error in the longitudinal direction, so that the image forming device can perform normal imaging when executing imaging of the second portrait.

[0094] In an optional embodiment, as Figure 6 As shown, the method further includes:

[0095] S200C: When the control detection device performs detection on the first image and no detection result is obtained, a preset position error or a position error in the longitudinal direction calculated last time is used as the detection result.

[0096] In this embodiment, if the controller 300 fails to obtain a detection result after controlling the CTD sensor 200 to execute step S200A, or fails to obtain a detection result after controlling the scanner 500 to execute step S200B, the controller 300 uses a preset position error pre-stored in the memory 400 as the longitudinal position error, or uses the longitudinal position error previously calculated and stored in the memory 400 as the current longitudinal position error. That is, if step S200A or step S200B fails to execute, the controller 300 executes step S200C. If the CTD sensor or scanner is damaged or the detection accuracy is insufficient, resulting in an inability to detect an accurate value, the preset position error or the longitudinal position error previously calculated and stored in the memory 400 can be used as the current longitudinal position error for subsequent error correction to ensure normal execution of the correction process.

[0097] Since the storage method of the position error in the longitudinal direction in the memory 400 can be an overwriting storage, that is, when a new position error in the longitudinal direction is stored, the old position error in the longitudinal direction originally stored in the memory 400 will be overwritten, at this time, when the controller 300 uses the position error in the longitudinal direction stored in the memory 400, since there is only one position error in the longitudinal direction, the controller 300 directly uses the position error in the longitudinal direction; in addition, the storage method of the position error in the longitudinal direction in the memory 400 can also be a normal storage method, that is, when a new position error in the longitudinal direction is stored, the old position error in the longitudinal direction originally stored in the memory 400 will not be overwritten, at this time, when the controller 300 uses the position error in the longitudinal direction stored in the memory 400, since there are multiple position errors in the longitudinal directions, the controller 300 uses the latest stored position error in the longitudinal direction.

[0098] In an optional embodiment, as Figure 7 As shown, in step S300A, when controlling the image forming device to perform imaging of the second image based on the position error in the longitudinal direction, performing inter-regional adjustment on the image data of the second image includes:

[0099] S310A: Controlling the CTD sensor to perform detection on the first image and obtaining a detection result, and dividing the detection result into intervals;

[0100] In this embodiment, the controller 300 controls the CTD sensor 200 to execute step S200A and obtain the detection results for interval analysis, that is, the data of all the positioning color blocks in the correction image are analyzed within intervals; because the color registration error in the longitudinal direction may show regular fluctuation deviations with the photosensitive drum (photosensitive body), the height of the monochrome color horizontal line group (that is, the length of the monochrome color horizontal line group along the transmission direction of the intermediate transfer belt) is at least greater than or equal to the length of a photosensitive drum rotation cycle, and the height of the monochrome color horizontal line group can be up to the length of the paper, that is, the first image is designed to be a monochrome colorant pattern group composed of at least one color composed of straight lines extending in the horizontal direction, which is separated in the longitudinal direction on the intermediate transfer body to form a circumferential length of the photosensitive body greater than or equal to the colorant pattern. When the CTD sensor is used as the detection device, the setting method of the first image can refer to Figure 8 , that is, the CTD sensor located on the left side of the intermediate transfer belt is used to detect the black colorant pattern group, and the CTD sensor located on the right side of the intermediate transfer belt is used to detect the yellow colorant pattern group, the red colorant pattern group, and the cyan colorant pattern group. It can be understood that the CTD sensor located on the left side of the intermediate transfer belt can also be used to detect one or more of the black colorant pattern group, the yellow colorant pattern group, the red colorant pattern group, and the cyan colorant pattern group, and the CTD sensor located on the right side of the intermediate transfer belt is used to detect the remaining colorant pattern groups except the colorant pattern group detected by the CTD sensor located on the left side of the intermediate transfer belt. For example, the CTD sensor located on the left side of the intermediate transfer belt is used to detect the black toner pattern group and the yellow toner pattern group, and the CTD sensor located on the right side of the intermediate transfer belt is used to detect the red toner pattern group and the cyan colorant pattern group. The present invention does not impose any restrictions on this. In addition, the height of the horizontal lines of the vertical wavy line drawing must be less than the acceptable color registration error. For example, if the acceptable color registration error is 0.05mm, then the height of the single-color horizontal line group must be less than 0.05mm.

[0101] If the controller 300 cannot obtain a detection result after controlling the CTD sensor to execute step S200A, the controller 300 uses a preset detection result pre-stored in the memory 400 as the detection result of the CTD sensor, or uses the detection result obtained by the last detection by the CTD sensor or the scanner 500. The detection result obtained by the last detection by the CTD sensor may be the detection result stored in the memory 400 after the last detection by the CTD sensor.

[0102] S320: Determine whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction;

[0103] In this embodiment, if Figure 9As shown, the position error in the longitudinal direction can be numbered in advance according to different error intervals, and corresponding row data adjustment values ​​can be set for different numbers. The numbers and row data adjustment values ​​are set in the form of a preset table and stored in the memory 400. When the controller 300 subsequently calculates the position error in the longitudinal direction, the controller 300 can substitute the number corresponding to the position error in the longitudinal direction of each interval into the preset table stored in the memory 400 for query. If the row data adjustment value is not zero, it indicates that there is a portrait fluctuation in the longitudinal direction that needs to be adjusted. Conversely, if the row data adjustment value is zero, it indicates that there is no portrait fluctuation in the longitudinal direction, and there is no need to adjust it.

[0104] S330: If there is image fluctuation in the longitudinal direction in the interval, adjust the row data in the second image.

[0105] In this embodiment, when the controller 300 determines that there is a fluctuation of the image in the longitudinal direction in a certain interval, the controller 300 controls the image forming apparatus to perform imaging of the second image according to, for example, Figure 9 The row data adjustment value obtained from the preset table is used to adjust the row data of the corresponding interval in the second image to repair the image waveform interval so that the image in the next print job to be printed can be imaged normally.

[0106] In an optional embodiment, as Figure 10 As shown, in step S300B, when controlling the image forming device to perform imaging of the second image based on the position error in the longitudinal direction, performing inter-regional adjustment on the image data of the second image includes:

[0107] S310B: Controlling the scanner to perform detection on the first image and obtaining a detection result, and dividing the detection result into intervals;

[0108] In this embodiment, step S310B and Figure 7 The difference of step S310A shown in FIG. 3 is that the controller 300 controls the scanner 500 to perform S200B to obtain the detection results for segmented analysis, that is, the data of all the positioning color blocks in the corrected image are segmented and analyzed; and since the scanner 500 can scan four colors at the same time (i.e., the four colors of YCMK are scanned together), it can be scanned according to the following steps: Figure 11The drawing shown is set, in which case the length of the horizontal line group is the circumferential length of the photosensitive drum. For example, taking one photosensitive drum (photoreceptor) cycle as an example, for example, the longitudinal length of the image is 630mm, with each 5mm interval as a segment. Of course, the longitudinal length of the image can also be set according to actual needs, and specifically, it can be not a photosensitive drum cycle, but the maximum printable length of the image forming device (i.e., the length of the paper).

[0109] If the controller 300 fails to obtain a detection result after controlling the scanner 500 to execute S200B, the controller 300 will use a preset detection result pre-stored in the memory 400 as the detection result of the scanner 500, or use the detection result obtained by the last detection by the scanner 500. The detection result obtained by the last detection by the scanner 500 may be stored in the memory 400 after the last detection by the scanner 500. If the scanner is damaged or the detection accuracy is insufficient, resulting in an inability to detect an accurate value, the preset position error or the previously calculated longitudinal position error stored in the memory 400 can be used as the current longitudinal position error for subsequent error correction to ensure the normal execution of the correction process.

[0110] S320: Determine whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction;

[0111] In this embodiment, step S320 and Figure 7 The step S320 shown is the same as that shown in FIG. 1 , and therefore will not be described again here.

[0112] S330: If there is image fluctuation in the longitudinal direction in the interval, adjust the row data in the second image.

[0113] In this embodiment, step S330 and Figure 7 The step S320 shown is the same as that shown in FIG. 1 , and therefore will not be described again here.

[0114] In an optional embodiment, as Figure 12 As shown, in step S330, if there is a longitudinal image fluctuation in the interval, adjusting the row data in the second image includes:

[0115] S330A: If there is a longitudinal stretch of the image in the interval, delete the row data in the interval corresponding to the second image using the first preset method;

[0116] In this embodiment, if the controller 300 Figure 9 If the row data adjustment value found in the preset table is negative, it means that the image is stretched in this interval, such as Figure 13The portrait stretching interval shown on the left, and the corresponding value obtained by the query is the number of deleted rows. The controller 300 uses the first preset method to delete the row data in the interval corresponding to the second portrait. Exemplarily, the first preset method can be an average deletion method. For example, there are 1000 rows of job information in the interval vertically, and the row data adjustment value obtained by the query is -10 (that is, it means that 10 rows of data need to be deleted). The controller 300 uses the average deletion method to delete the row data in the interval corresponding to the second portrait, that is, delete the 100th row, the 200th row, the 300th row and other data to repair the portrait stretching interval and make the portrait in the interval normally imaged, such as Figure 13 The normal image range shown on the right corresponds to the image stretching range.

[0117] S330B: If there is image compression in the longitudinal direction in the interval, the row data in the interval corresponding to the second image is increased using a second preset method.

[0118] In this embodiment, if the controller 300 Figure 9 If the row data adjustment value found in the preset table is a positive number, it means that image compression exists in the interval, such as Figure 13 The image compression interval shown on the left, and the corresponding value obtained by the query is the number of added rows. The controller 300 uses the second preset method to increase the row data in the interval corresponding to the second image. Exemplarily, the second preset method can be an average insertion method or supplementary repeated job data. For example, there are 1000 rows of job information vertically in the interval, and the row data adjustment value obtained by the query is +10 (that is, it means that 10 rows of data need to be added). The controller 300 uses the average insertion method to increase the row data in the interval corresponding to the second image, that is, inserting blank row data on average in the 101st row, the 201st row, the 301st row, etc., or supplementing the data of the 100th row, the 200th row, the 300th row, etc. as supplementary data to the 101st row, the 201st row, the 301st row, etc., so as to repair the image compression interval and make the image of the interval normally imaged, such as Figure 13 The normal image range shown on the right corresponds to the image compression range.

[0119] In this embodiment, since there are two situations of image fluctuation, one is stretching and the other is compression, step S330A and step S330B do not have a logical order, and the above two steps will be executed one by one during the execution process, that is, step S330A and step S330B will not be executed at the same time.

[0120] The longitudinal correction error adjustment method of this embodiment calculates the detection result of the detected first image to obtain the position error in the longitudinal direction, and uses the position error in the longitudinal direction to adjust the image data of the second image within the interval. This can eliminate the periodic jitter caused by the gears on the transmission system (such as the photosensitive drum transmission system), avoid longitudinal color deviation, and further improve the user's high-precision image experience.

[0121] An embodiment of the present invention provides an image forming device, such as Figure 3 As shown, the image forming device includes:

[0122] The controller 300 is configured to obtain a first image and control the image forming device to perform imaging of the first image, wherein the first image is used to represent a correction image for adjusting a longitudinal correction error;

[0123] A detection device, which may be a CTD sensor 200 or a scanner 500, is controlled by the controller 300 to perform detection on the first image to obtain a detection result;

[0124] The controller 300 is also used to calculate the position error in the longitudinal direction based on the detection results, and based on the position error in the longitudinal direction, when controlling the image forming device to perform imaging of the second portrait, adjust the portrait data of the second portrait between partitions so that the second portrait can be imaged normally, wherein the second portrait is used to represent the job to be printed.

[0125] In an optional embodiment, the controller 300 further adjusts the image data of the second image between partitions based on the position error in the longitudinal direction when controlling the image forming device to perform imaging of the second image, including:

[0126] The controller 300 is used to divide the detection result obtained by controlling the detection device (i.e., the CTD sensor 200 or the scanner 500) to perform detection on the first image into intervals;

[0127] The controller 300 is configured to determine whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction;

[0128] The controller 300 is configured to adjust the row data in the second image when there is image fluctuation in the longitudinal direction in the interval.

[0129] In an optional embodiment, when there is a longitudinal image fluctuation in the interval, the controller 300 is configured to adjust the row data in the second image, including:

[0130] The controller 300 is configured to delete the row data in the interval corresponding to the second image using a first preset method when there is image stretching in the longitudinal direction in the interval; or

[0131] The controller 300 is configured to increase the row data in the interval corresponding to the second image using a second preset method when there is image compression in the longitudinal direction of the interval.

[0132] In an optional embodiment, the controller 300 uses the first preset method to delete the row data in the interval corresponding to the second portrait, including:

[0133] The controller 300 deletes the row data in the interval corresponding to the second image by using an average deletion method or deleting duplicate operation data; or

[0134] The controller 300 uses the second preset method to add row data in the interval corresponding to the second portrait, including:

[0135] The controller 300 increases the row data in the interval corresponding to the second portrait by using an average insertion method or supplementing repeated operation data.

[0136] It should be noted that the specific processing procedures of the controller 300 , the CTD sensor 200 and the scanner 500 in the image forming apparatus have been described in detail in the longitudinal correction error adjustment method, and thus will not be described in detail here.

[0137] An embodiment of the present invention provides an image forming device, such as Figure 14 As shown, Figure 14 The image forming apparatus shown is merely an example and should not limit the functionality and scope of use of the embodiments of the present invention.

[0138] like Figure 14 As shown, the image forming device is represented as a general-purpose computing device. Components of the image forming device may include, but are not limited to, one or more processors 910, a memory 930, and a communication bus 940 connecting various system components (including the memory 930 and the processor 910).

[0139] Communication bus 940 represents one or more 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. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnection (PCI) bus.

[0140] The image forming device typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the image forming device, including volatile and non-volatile media, removable and non-removable media.

[0141] The memory 930 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The image forming apparatus may further include other removable / non-removable, volatile / non-volatile computer system storage media. Figure 14 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a Compact Disc Read Only Memory (hereinafter referred to as: CD-ROM), a Digital Video Disc Read Only Memory (hereinafter referred to as: DVD-ROM), or other optical media) may be provided. In these cases, each drive can be connected to the communication bus 940 via one or more data medium interfaces. The memory 930 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of various embodiments of the present invention.

[0142] A program / utility having a set (at least one) of program modules may be stored in memory 930. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may include an implementation of a network environment. The program modules generally perform the functions and / or methods of the embodiments described herein.

[0143] The image forming device may also communicate with one or more external devices, one or more devices that enable a user to interact with the image forming device, or any device that enables the image forming device to communicate with one or more other computing devices (e.g., a network card, a modem, etc.). Such communication may be performed via the communication interface 920. Furthermore, the image forming device may also communicate with the network adapter ( Figure 14 The network adapter can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via the communication bus 940. Figure 14 Not shown, other hardware and / or software modules may be used in conjunction with the image forming device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, disk arrays (Redundant Arrays of Independent Drives; hereinafter referred to as: RAID) systems, tape drives, and data backup storage systems.

[0144] The processor 910 executes various functional applications and data processing by running the programs stored in the memory 930, such as implementing the longitudinal correction error adjustment method provided in the embodiment of the present invention.

[0145] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the longitudinal correction error adjustment method provided by the embodiment of the present invention.

[0146] The above-mentioned computer-readable storage medium can adopt any combination of one or more computer-readable media.Computer-readable media can be computer-readable signal media or computer-readable storage media.Computer-readable storage media can be, for example, a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof, but is not limited thereto.More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM) or a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.In this document, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by an instruction execution system, device or device or used in combination with it.

[0147] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0148] The program code embodied on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wire, optical cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

[0149] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A longitudinal correction error adjustment method, executed in an image forming device, characterized in that: The method comprises: Acquiring a first image and controlling the image forming device to form an image of the first image, wherein the first image is used to represent a correction image for adjusting a longitudinal correction error; the first image is designed as a group of single-color toner patterns of at least one color formed by straight lines extending in a horizontal direction, separated in a longitudinal direction on an intermediate transfer body by a length greater than or equal to the circumference of a photoreceptor to form the toner patterns; controlling a detection device to detect the first image to obtain a detection result, and calculating a position error in a longitudinal direction based on the detection result; Controlling the detection device to perform detection on the first image and dividing the detection result obtained into intervals; Determining whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction; If there is image fluctuation in the longitudinal direction in the interval, the line data in the second image is adjusted to enable the second image to be normally imaged, wherein the second image is used to represent the job to be printed.

2. The longitudinal correction error adjustment method according to claim 1, characterized in that: The detection device comprises: Image density sensor or scanner.

3. The longitudinal correction error adjustment method according to claim 1, characterized in that: The method further comprises: When no detection result is obtained by controlling the detection device to detect the first image, a preset position error or a position error in the longitudinal direction calculated last time is used as the detection result.

4. The longitudinal correction error adjustment method according to claim 1, characterized in that: The first image includes a toner pattern group of at least one color among a cyan toner pattern group, a magenta toner pattern group, a yellow toner pattern group, and a black toner pattern group.

5. The longitudinal correction error adjustment method according to claim 1, characterized in that: If there is image fluctuation in the longitudinal direction in the interval, adjusting the row data in the second image includes: If there is a longitudinal stretch of the image in the interval, the row data in the interval corresponding to the second image is deleted using a first preset method; or If there is image compression in the longitudinal direction in the interval, a second preset method is used to increase the row data in the interval corresponding to the second image.

6. The longitudinal correction error adjustment method according to claim 5, characterized in that: The deleting of row data in the interval corresponding to the second portrait by using the first preset method includes: Using an average deletion method to delete the row data in the interval corresponding to the second portrait; or The adding of row data in the interval corresponding to the second portrait by using the second preset method includes: The row data in the interval corresponding to the second portrait is increased by using an average insertion method or supplementing repeated operation data.

7. The longitudinal correction error adjustment method according to claim 2, characterized in that: The method further comprises: When the detection device is the image density sensor, the image forming apparatus performs imaging of the first image on an intermediate transfer body or a printing medium, and controls the image density sensor to perform detection of the first image to obtain a detection result; or When the detection device is the scanner, the image forming apparatus controls the scanner to perform detection on the first image to obtain a detection result.

8. An image forming device, characterized in that: include: a controller configured to acquire a first image and control the image forming device to form an image of the first image, wherein the first image is configured to represent a correction image for adjusting a longitudinal correction error; the first image is configured to be a set of single-color toner patterns of at least one color formed by horizontally extending straight lines, separated longitudinally on an intermediate transfer body by a length greater than or equal to the circumference of a photoreceptor to form the toner patterns; a detection device, the detection device being controlled by the controller to perform detection on the first image to obtain a detection result; The controller is used to control the detection device to perform detection on the first portrait and divide the detection result into intervals; The controller is configured to determine whether there is image fluctuation in the longitudinal direction in each interval obtained by dividing the intervals based on the position error in the longitudinal direction; The controller is used to adjust the line data in the second image so that the second image is normally formed when there is image fluctuation in the longitudinal direction in the interval, wherein the second image is used to represent the job to be printed.

9. The image forming apparatus according to claim 8, wherein The controller is configured to adjust the row data in the second image when there is image fluctuation in the longitudinal direction in the interval, comprising: The controller is configured to delete the row data in the interval corresponding to the second image using a first preset method when there is image stretching in the longitudinal direction in the interval; or The controller is configured to use a second preset method to increase the row data in the interval corresponding to the second image when there is image compression in the longitudinal direction of the interval.

10. The image forming apparatus according to claim 9, wherein The controller deletes the row data in the interval corresponding to the second portrait using the first preset method, including: The controller deletes the row data in the interval corresponding to the second portrait by using an average deletion method or deleting duplicate operation data; or The controller adopting the second preset method to add row data in the interval corresponding to the second portrait includes: The controller increases the row data in the interval corresponding to the second portrait by using an average insertion method or supplementing repeated operation data.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the longitudinal correction error adjustment method according to any one of claims 1 to 7 when executed.

Images