Image color calibration method and device and image forming equipment

Abstract

The embodiment of the invention provides an image color calibration method and device and image forming equipment, and the method comprises the steps: obtaining a color overlapping image on a transfer printing belt according to an obtained correction image; and detecting the carbon powder concentration of each color overlapping area in the color overlapping image to obtain an actual waveform signal corresponding to each color overlapping area. And according to a comparison result of the waveform characteristic of the actual waveform signal and the waveform characteristic of a preset reference waveform signal, determining the offset degree of each color block in the color overlapping area during imaging. And performing color alignment calibration according to the offset degree. By adopting the technical scheme, color register correction of the image forming equipment can be realized, and on one hand, black carbon powder is not needed as a reference, so that the application scene is wider; and on the other hand, the correction of the carbon powder in various colors can be realized through single transfer printing, and the correction efficiency is higher.

Description

Technical Field

[0001] This application relates to the field of image forming technologies, and particularly to an image color calibration method, apparatus, and image forming device. Background Art

[0002] The printing four-color mode (CMYK) is a color separation mode adopted by image forming devices during color printing. By mixing and superimposing four colors: cyan (C), magenta (M), yellow (Y), and black (K), "full-color printing" is achieved. During color printing, the image forming device needs to transfer the four-color toner onto the transfer belt separately and superimpose them to obtain the color pattern to be imaged, which is called "color separation", and then complete imaging through fixing.

[0003] However, during the long-term use of an image forming device, the color alignment of the CMYK four colors may deviate, resulting in multiple color afterimages in the obtained imaging result. Therefore, it is necessary to perform color separation correction on the image forming device. Summary of the Invention

[0004] In view of this, this application provides an image color calibration method, apparatus, and image forming device to achieve color separation correction of the image forming device.

[0005] In a first aspect, an embodiment of this application provides an image color calibration method, including: when performing color alignment calibration on an image forming device, obtaining a superimposed color image on the transfer belt according to the obtained calibration image; each superimposed color pattern in the calibration image is imaged using at least two color toners, and each color toner is aligned and stacked with each other during transfer; detecting the toner concentration of each superimposed color area in the superimposed color image to obtain the actual waveform signal corresponding to each superimposed color area; the superimposed color patterns in the calibration image correspond one-to-one with the superimposed color areas in the superimposed color image; determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of the preset reference waveform signal; performing color alignment calibration according to the offset degree.

[0006] In a possible implementation manner, determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of the preset reference waveform signal includes: determining a target waveform area from the actual waveform signal; the target waveform area is a waveform composed of at least one rising edge and at least one falling edge, and at least includes partial waveforms of each color block on the superimposed color area; determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal.

[0007] In a possible implementation, according to the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform signal, determine the offset degree of each color block on the overprint region during imaging, including: if there are two color blocks on the overprint region, and there is only one independent waveform in the target waveform region, and the independent waveform is a three-layer stepped waveform, then determine that there is misalignment of each color block on the overprint region during imaging; obtain the first total waveform width of the independent waveform; according to the first total waveform width and the total waveform width of the preset reference waveform signal, obtain the first width difference, and determine the offset degree of each color block on the overprint region during imaging according to the first width difference.

[0008] In a possible implementation, according to the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform signal, determine the offset degree of each color block on the overprint region during imaging, and further include: if there are only two color blocks on the overprint region, and there are two independent waveforms in the target waveform region, then determine that there is misalignment of each color block on the overprint region during imaging; obtain the first distance between adjacent rising edges, or adjacent falling edges, or central positions among the two independent waveforms; based on the first distance and the waveform characteristics of the preset reference waveform signal, determine the offset degree of each color block on the overprint region during imaging.

[0009] In a possible implementation, according to the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform signal, determine the offset degree of each color block on the overprint region during imaging, and further include: if there are only two color blocks on the overprint region, and there is only one independent waveform in the target waveform region, and the independent waveform is a three-layer stepped waveform, then determine that there is misalignment of each color block on the overprint region during imaging; obtain the first step width of the highest layer stepped waveform, or obtain the first step distance between the rising edge of the bottom layer stepped waveform and the rising edge of the highest layer stepped waveform; based on the first step width or the first step distance, and the waveform characteristics of the preset reference waveform signal, determine the offset degree of each color block on the overprint region during imaging.

[0010] In a possible implementation, the color toner used for each color block on the overprint region during imaging does not include black toner; according to the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform signal, determine the offset degree of each color block on the overprint region during imaging, and further include: if there are three color blocks on the overprint region, and there is only one independent waveform in the target waveform region, and the independent waveform is a three-layer stepped waveform, then determine that there is misalignment of each color block on the overprint region during imaging; obtain the second total waveform width of the independent waveform; according to the second total waveform width and the total waveform width of the preset reference waveform signal, obtain the second width difference, and determine the offset degree of each color block on the overprint region during imaging according to the second width difference.

[0011] In a possible implementation, the color toner used for each color block in the overprint area during imaging does not include black toner; according to the comparison result between the waveform feature of the target waveform area and the waveform feature of the preset reference waveform signal, to determine the offset degree of each color block in the overprint area during imaging, it further includes: if there are three color blocks in the overprint area, and there is only one independent waveform in the target waveform area, and the independent waveform is a stepped waveform with at least three layers or more, then it is determined that there is misalignment of each color block in the overprint area during imaging; obtaining a second step distance between the rising edge of the highest layer stepped waveform and the rising edge of the bottommost layer stepped waveform on one side, and / or a third step distance between the falling edge of the highest layer stepped waveform and the falling edge of the bottommost layer stepped waveform on the other side; based on the second step distance, and / or the third step distance, and the waveform feature of the preset reference waveform signal, to determine the offset degree of each color block in the overprint area during imaging.

[0012] In a possible implementation, the color toner used for each color block in the overprint area during imaging does not include black toner; according to the comparison result between the waveform feature of the target waveform area and the waveform feature of the preset reference waveform signal, to determine the offset degree of each color block in the overprint area during imaging, it further includes: if there are three in the overprint area, and there are two or more independent waveforms in the target waveform area, then it is determined that there is misalignment of each color block in the overprint area during imaging; obtaining a second distance between the rising edge of the first independent waveform and the rising edge of each subsequent independent waveform; according to the second distance and the waveform feature of the preset reference waveform signal, to determine the offset degree of each color block in the overprint area during imaging.

[0013] In a possible implementation, the method further includes: when performing color alignment calibration on the image forming device, the concentrations of the color toners during imaging are different, and the voltage values of the electrical signals obtained by detecting the toner concentrations of the color toners are different.

[0014] In a second aspect, an embodiment of the present application provides an image color calibration device, including: a transfer module, configured to obtain an overprint image on the transfer belt according to the obtained calibration image when performing color alignment calibration on the image forming device; each overprint pattern in the calibration image is imaged using at least two color toners, and the color toners are aligned and stacked with each other during transfer; a detection module, configured to detect the toner concentration of each overprint area in the overprint image to obtain an actual waveform signal corresponding to each overprint area; the overprint pattern in the calibration image corresponds to the overprint area in the overprint image one by one; a determination module, configured to determine the offset degree of each color block in the overprint area during imaging according to the comparison result between the waveform feature of the actual waveform signal and the waveform feature of the preset reference waveform signal; a calibration module, configured to perform color alignment calibration according to the offset degree.

[0015] In a third aspect, an embodiment of the present application provides an image forming apparatus, including a memory for storing computer program instructions and a processor for executing the program instructions. When the computer program instructions are executed by the processor, the image forming apparatus is triggered to execute the method according to any one of the above first aspects.

[0016] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which includes a stored program. When the program runs, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of the first aspects.

[0017] An image color calibration method, apparatus, and image forming apparatus provided by the present application have at least the following technical effects:

[0018] When performing color alignment calibration on an image forming apparatus, a superimposed color image is obtained based on the acquired calibration image for toner concentration detection, and an actual waveform signal corresponding to the superimposed color area in the superimposed color image is obtained. Furthermore, according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of a preset reference waveform signal, the offset degree of each color block in the superimposed color area during imaging can be determined, and color alignment calibration is performed according to the offset degree. In each embodiment of the present application, color alignment calibration can be achieved based on the waveform characteristics of the actual waveform signal of the superimposed color area and the waveform characteristics of the preset reference waveform signal, which can help improve the accuracy of superimposed color calibration. At the same time, it can provide another executable method for superimposed color calibration, reduce the limitations of the execution method, so as to meet the calibration requirements in different machine device environments, and help optimize the reliability of color alignment calibration of the image forming apparatus. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic flowchart of an image color calibration method provided by an embodiment of the present application;

[0021] Figure 2 is a schematic flowchart of another image color calibration method provided by an embodiment of the present application;

[0022] Figure 3 is a schematic scenario diagram of an image color calibration method provided by an embodiment of the present application;

[0023] Figure 4Scenario schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0024] Figure 5 Waveform schematic diagram of an image color calibration method provided by an embodiment of the present application;

[0025] Figure 6 Scenario schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0026] Figure 7 Scenario schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0027] Figure 8 Waveform schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0028] Figure 9 Flow schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0029] Figure 10 Waveform schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0030] Figure 11 Scenario schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0031] Figure 12 Waveform schematic diagram of another image color calibration method provided by an embodiment of the present application;

[0032] Figure 13 Structure schematic diagram of an image color calibration device provided by an embodiment of the present application;

[0033] Figure 14 Structure schematic diagram of an image forming device provided by an embodiment of the present application. Detailed implementation manners

[0034] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0036] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the", and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise.

[0037] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0038] The printing four-color mode (CMYK) is a color separation mode adopted by an image forming device when performing color printing. Through the mixing and superposition of four colors: cyan (C), magenta (M), yellow (Y), and black (K), "full-color printing" is achieved. When performing color printing, the image forming device needs to transfer the four-color toner to the transfer belt separately to obtain a superimposed color image to be imaged, which is called "color separation", and then fix and image the superimposed color image.

[0039] However, during the long-term use of the image forming device, the color alignment of the four CMYK colors may deviate, resulting in the inability of the toner of each color in the superimposed color image to completely overlap. Then, multiple color afterimages will appear in the obtained imaging result, and the imaging quality is poor. Therefore, it is necessary to perform color separation correction on the image forming device.

[0040] In the existing technical solutions, the K-color toner needs to be used as a reference to align the other color toners with the black toner respectively, so as to achieve correction. However, in actual scenarios, since the frequency of black and white printing is much higher than that of color printing, the situation where the K-color toner is exhausted while the C, M, and Y toner cartridges still have a surplus often occurs. At this time, the existing color separation correction method will not be able to achieve color separation correction. Moreover, the existing correction technology can only correct one color toner each time, and it is necessary to compare by repeatedly transferring multiple superimposed color patterns, which takes a long time and the correction efficiency is low.

[0041] Therefore, the present application is proposed.

[0042] The present application can provide an image forming device for performing the image color calibration method provided by the present application, so as to achieve color separation correction, align the four CMYK color toners in the paper feeding direction and the main scanning direction, and prevent multiple color afterimages from appearing in the documents printed by the user.

[0043] The device forms of the above image forming device include, but are not limited to: inkjet printers, laser printers, light emitting diode (LED) printers, copiers or multifunction machines, and multifunctional peripherals (MFPs) that perform the above functions in a single device, etc.

[0044] The following provides a detailed description of the color calibration method provided in this application.

[0045] See Figure 1 , which is a schematic flowchart of an image color calibration method provided in an embodiment of this application. As Figure 1 shown, the method includes:

[0046] S101. When performing color alignment calibration on the image forming device, according to the obtained calibration image, obtain the overlaid color image on the transfer belt. Each overlaid color pattern in the calibration image is imaged using at least two color toners, and the color toners are aligned and stacked with each other during transfer.

[0047] S102. Detect the toner concentration of each overlaid color area in the overlaid color image to obtain the actual waveform signal corresponding to each overlaid color area. The overlaid color patterns in the calibration image correspond one-to-one with the overlaid color areas in the overlaid color image.

[0048] S103. Determine the offset degree of each color block during imaging on the overlaid color area according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of the preset reference waveform signal.

[0049] S104. Perform color alignment calibration according to the offset degree.

[0050] In the embodiment of this application, the image forming device can start the method flow provided in the embodiment of this application according to a set period; or, the image forming device can start the method flow provided in the embodiment of this application in response to a user's trigger operation.

[0051] After the above method flow is started, first, the image forming device can obtain a preset calibration image and transfer the calibration image to the transfer belt to obtain an overlaid color image.

[0052] As Figure 3As shown, the corrected image is obtained on the right side. The corrected image may include overlaid color patterns. Each overlaid color pattern is imaged using at least two color toners, and the color toners are aligned and stacked with each other during transfer. That is, the corrected image serves as a reference image, and imaging is performed based on this corrected image during color alignment calibration. Further, as the reference image, the overlaid color patterns on the corrected image are formed by at least two color toners that are aligned and stacked with each other. That is, imaging is performed using at least two color toners, and they are aligned and stacked with each other during transfer, such as Y color and M color; C color and Y color; M color, C color, and Y color, etc. The specific shape of the overlaid color pattern in the embodiments of the present application is not limited. For example, it can be a line with a preset length, a rectangle with a preset size, etc. The left side is a cross-sectional view of the toner layer of the overlaid color image formed after the corrected image is transferred to the transfer belt. Due to long-term use, the color toners in the transferred overlaid color image may be offset. Among them, there are multiple color blocks in the overlaid color area, and each color block is formed by the transfer of color toner. In fact, determining the offset degree of each color block in the overlaid color area during imaging can determine the offset degree of the color toner during transfer imaging.

[0053] In the case where the color toners are offset in the paper feed direction and the main scanning direction, it can be understood that the toners overlaid in each overlaid color area in the above overlaid color image are not the same.

[0054] Based on the above description, in the embodiments of the present application, a sensor can be used to detect the toner concentration in each overlaid color area of the overlaid color image and obtain the actual waveform signal corresponding to each overlaid color area. Among them, as Figure 3 shown, the overlaid color patterns in the corrected image correspond one-to-one with the overlaid color areas in the overlaid color image. The above sensor can be an optical sensor. The way the sensor detects the toner concentration can be to emit light signals to each overlaid color area of the overlaid color image and receive the reflection signals formed by diffuse reflection in each overlaid color area. Furthermore, an electrical signal associated with it is generated based on the intensity of the reflection signal, that is, the above actual waveform signal.

[0055] In the embodiments of the present application, the signal values of each point in the obtained actual waveform signal are associated with the toner concentration of the corresponding overlaid color area. Specifically, the greater the toner concentration, the greater the corresponding signal value, and vice versa, the smaller the corresponding signal value. Based on this, the offset degree of each color toner during imaging can be determined according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of the preset reference waveform signal. Among them, the preset reference waveform signal is the waveform signal corresponding to when the color toners in the overlaid color image are completely overlapped.

[0056] Specifically, a target waveform region can be determined from the obtained waveform signal. The target waveform region is a waveform composed of at least one rising edge and at least one falling edge, and at least includes partial waveforms of each color block on the overprint region. Furthermore, the offset degree when the color toner corresponding to each color block on the overprint region is imaged can be determined according to the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform signal.

[0057] After determining the offset degree, when performing color alignment calibration, one of the determined color toners can be used as the reference color, and the other color toners are adjusted to align with the reference color.

[0058] Through the above technical solution, the color registration of multiple color toners can be completed by using the overprint pattern obtained by single transfer, without having to repeat the transfer of the overprint pattern, which takes less time and has higher calibration efficiency.

[0059] In another embodiment of the present application, refer to Figure 2 , which is a schematic flowchart of an image color calibration method provided by an embodiment of the present application. As Figure 2 shown, the above S103 can be further included:

[0060] S201, determining a target waveform region from the actual waveform signal. The target waveform region is a waveform composed of at least one rising edge and at least one falling edge, and at least includes partial waveforms of each color block on the overprint region.

[0061] S202, determining the offset degree when each color block on the overprint region is imaged according to the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform signal.

[0062] In the embodiment of the present application, based on the differences in the offset degrees of each color block on each overprint region in the overprint image, the waveform characteristics of the actual waveform signals corresponding to the toner concentrations of each overprint region are also different. Specifically, for the region where more types of toner colors are overlaid, the voltage value of the corresponding actual waveform signal is higher, and for the region where fewer types of toner colors are overlaid, the voltage value of the corresponding actual waveform signal is lower.

[0063] Based on the above description, it can be understood that for the case where each color block on each overprint region in the overprint image has an offset, the corresponding actual waveform signal includes more than one rising edge and falling edge. Among them, the rising edge of the voltage value corresponds to the boundary where the toner concentration in the overprint region increases (i.e., the number of overlaid color blocks increases), and the falling edge of the voltage value in the waveform signal can correspond to the boundary where the toner concentration in the overprint region decreases (i.e., the number of overlaid color blocks decreases). For the case where each color block on each overprint region in the overprint image is completely overlapped, the corresponding preset reference waveform signal has only one rising edge and one falling edge.

[0064] Then, in the embodiments of the present application, the offset degree of each color block on the overprinting area during imaging can be determined according to the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal.

[0065] For ease of understanding, the following uses a scenario diagram to illustrate two possible implementation scenarios in the embodiments of the present application by way of example.

[0066] Scenario 1

[0067] The overprinting area contains two types of color toner, such as C-color and M-color toner; or C-color and Y-color toner; or M-color and Y-color toner. The method implementation processes corresponding to each color combination are the same, and the present application only takes any one of them as an example for illustration.

[0068] For Scenario 1, see Figure 3 . The left side shows a cross-sectional view of the toner layer of the overprinting image generated by each color toner after the calibration image is transferred to the transfer belt. The right side shows the calibration image. Exemplarily, when each color toner is C-color and M-color toner, the overprinting image obtained by imaging appears as blue (Blue, B), that is, it corresponds to the blue overprinting pattern in the calibration image.

[0069] Based on the difference in the offset degree of each color toner during imaging, as Figure 4 shown, there are three possible states of the above cross-sectional view of the toner layer, namely: a completely overlapping state, a partially overlapping state, and a completely non-overlapping state. For the three states as Figure 4 shown, the waveform characteristics of the corresponding actual waveform signals are different.

[0070] Specifically, for the completely overlapping state, the corresponding actual waveform signal is as shown in 5A in Figure 5 . This actual waveform signal contains an independent waveform and only has one layer of steps, which is consistent with the waveform characteristics of the preset reference waveform signal.

[0071] For the partially overlapping state, at this time, the toner concentration increases at the edge part of the overprinting area, and the voltage value of the corresponding actual waveform signal increases; at the middle part of the overprinting area, the toner concentration further rises to the highest value, and the voltage value of the corresponding actual waveform signal further rises to the highest value; at the other edge part of the overprinting area, the toner concentration decreases compared with the middle part, and the voltage value of the corresponding actual waveform signal decreases. At this time, the complete actual waveform signal is as shown in 5B in Figure 5 . This actual waveform signal contains an independent waveform, and this independent waveform is a three-layer stepped waveform. It is inconsistent with the waveform characteristics of the preset reference waveform signal.

[0072] For such a state, in the embodiments of the present application, the first total waveform width d2 of the independent waveform in the actual waveform signal can be obtained. Then, based on the first total waveform width d2 and the total waveform width d1 of the preset reference waveform signal, the first width difference is obtained. Finally, based on the first width difference, the offset degree of each color block in the color mixing area during imaging is determined.

[0073] For the above partial overlap state, in the embodiments of the present application, the first step width C2 of the topmost step waveform can also be obtained, or the first step distance C1 between the rising edge of the bottommost step waveform and the rising edge of the topmost step waveform can be obtained. Then, based on the first step width C2 or the first step distance C1, and the waveform characteristics of the preset reference waveform signal, the offset degree of each color block in the color mixing area during imaging is determined. Specifically, the first step width C2 can be compared with the width d1 of the preset reference waveform signal, and based on the difference between the two, the offset degree of each color block during imaging is determined. Alternatively, the first step distance C1 can be compared with the step distance (which is 0) of the preset reference waveform signal, and based on the difference between the two, the offset degree of each color block during imaging is determined.

[0074] For the completely non-overlapping state, the corresponding actual waveform signal is as Figure 5 shown in 5C, and this waveform signal includes two independent waveforms. It is inconsistent with the waveform characteristics of the preset reference waveform signal.

[0075] For such a state, in the embodiments of the present application, the distance d3 between adjacent rising edges, or the distance d4 between adjacent falling edges, or the distance d5 between the central positions in the two independent waveforms can be obtained. Then, based on the distance d3 or d4 or d5 and the waveform characteristics of the preset reference waveform signal, the offset degree of each color block in the color mixing area during imaging is determined. Among them, the distance between adjacent rising edges, or the distance between adjacent falling edges, or the distance between the central positions of the two independent waveforms of the preset reference waveform signal is 0.

[0076] Furthermore, in the embodiments of the present application, when performing color alignment calibration on the image forming device, different concentration values can also be set for different color toner imaging. Then, the voltage values of the electrical signals obtained by detecting the toner concentration of each color toner are different. Then, it is convenient to distinguish different color toners through the voltage values of the waveform signals. Furthermore, based on the offset degrees of each color toner deviating from the reference color toner calculated above, targeted correction can be performed on each color toner.

[0077] Scenario 2

[0078] The color mixing area includes three color toners, namely C-color, M-color, and Y-color toners. The method implementation processes corresponding to the three color toners in different color mixing orders are the same. The present application only takes any one of them as an example for illustration.

[0079] For Scenario 2, see Figure 6 . The left side shows the toner layer interface diagram of the overprinted image generated after the corrected image transfer, and the left side shows the corrected image.

[0080] Based on the differences in the offset degrees of the toners of each color in the overprinted area of the overprinted image, as Figure 7 shown, there are six possible states of the above toner layer cross-sectional diagram, which are: complete overlap state; state where two-color toners are completely overlapped and the other color toner is partially overlapped; state where three-color toners are partially overlapped; state where two-color toners are completely overlapped and the other color toner is completely non-overlapped; state where two-color toners are partially overlapped and the other color toner is completely non-overlapped; and complete non-overlap state.

[0081] For the six states as Figure 7 shown, the waveform characteristics of the corresponding actual waveform signals are different.

[0082] Specifically, for the complete overlap state, the corresponding actual waveform signal is as Figure 8 shown in 8A in it. This waveform signal contains an independent waveform. At this time, it is consistent with the preset reference waveform signal.

[0083] For the state where two-color toners are completely overlapped and the other color toner is partially overlapped, see Figure 8 8B in it. This waveform signal is similar to the waveform shown in Figure 5 5B in it, contains an independent waveform, and this independent waveform is a three-layer stepped waveform.

[0084] At this time, in the embodiment of the present application, it is determined that the color blocks on the overprinted area are misaligned during imaging. Furthermore, see Figure 8 8B in it. The second total waveform width e2 of the independent waveform can be obtained. Furthermore, according to the second total waveform width e2 and the total waveform width e1 of the preset reference waveform signal, the second width difference is obtained, and the offset degree of the color blocks on the overprinted area during imaging is determined according to the second width difference.

[0085] In the embodiment of the present application, the step distance f1 between the rising edge of the topmost stepped waveform and the rising edge of the bottommost stepped waveform on one side can also be obtained, or the step distance f2 between the falling edge of the topmost stepped waveform and the falling edge of the bottommost stepped waveform on the other side can be obtained. Based on the step distance f1 or f2 and the comparison result of the waveform characteristics of the preset reference waveform signal, the offset degree of the color blocks on the overprinted area during imaging is determined.

[0086] For the state where three-color toners are partially overlapped, the corresponding waveform signal is as Figure 8 shown in 8C in it. This waveform signal contains an independent waveform, and the independent waveform is a five-layer stepped waveform.

[0087] For the state shown in Figure 8 8C, in the embodiments of the present application, the second step distance f4 between the rising edge of the topmost step waveform and the rising edge of the bottommost step waveform on one side can be obtained, and the third step distance f6 between the falling edge of the topmost step waveform and the falling edge of the bottommost step waveform on the other side can be obtained. Based on the second step distance f4 and the third step distance f6, and the comparison result of the waveform characteristics of the preset reference waveform signal, the offset degree of each color block on the color mixing area during imaging is determined. Specifically, by comparing the second step distance f4 corresponding to the actual waveform signal and the second step distance (which is 0) corresponding to the preset reference waveform signal, the offset degree of the color toner corresponding to the topmost step waveform and the bottommost step waveform on one side is obtained. By comparing the third step distance f6 corresponding to the actual waveform signal and the third step distance (which is 0) corresponding to the preset reference waveform signal, the offset degree of the color toner corresponding to the topmost step waveform and the bottommost step waveform on the other side is obtained.

[0088] For the state where two color toners are completely overlapped and another color toner is completely non - overlapped, refer to Figure 8 8D in Figure 5 The waveform signal is similar to the waveform shown in 5C above and includes two independent waveforms.

[0089] For the completely non - overlapped state, refer to Figure 8 8F in

[0090] For the two states of 8D and 8F in 8 above, in the embodiments of the present application, the second distance between the rising edge of the first independent waveform and the rising edge of each subsequent independent waveform can be obtained, such as e3, e7, e8. Furthermore, based on the second distance and the comparison result of the waveform characteristics of the preset reference waveform signal, the offset degree of each color block on the color mixing area during imaging is determined. Among them, the second distance corresponding to the preset reference waveform signal is 0.

[0091] For the state where two color toners are partially overlapped and another color toner is completely non - overlapped, refer to Figure 8 8E in

[0092] For the above - mentioned state, in the embodiments of the present application, the method corresponding to the state shown in 8B in Figure 8 can be first used. According to the comparison result of the waveform width e6 of the independent waveform with three layers of steps and the waveform width e1 of the preset reference waveform signal, the offset degree of the color toner corresponding to the independent waveform with three layers of steps during imaging is determined. Furthermore, the method as shown in Figure 8The method corresponding to the states shown in FIGS. 8D and 8F determines the offset degree during imaging of the corresponding color toner according to the second distance e5 between the rising edges of two independent waveforms and the comparison result of the waveform characteristics of a preset reference waveform signal.

[0093] Furthermore, in the embodiments of the present application, when performing color alignment calibration on an image forming device, different concentration values can also be set for different color toners during imaging. Then, the voltage values of the electrical signals obtained by detecting the toner concentration of each color toner are different. Furthermore, it is convenient to distinguish different color toners through the voltage values of the waveform signals. Furthermore, based on the offset degree calculated above, targeted calibration can be performed on each color toner.

[0094] Through the above implementation method, when the black toner in the image forming device is exhausted, color registration calibration of the image forming device can be achieved, improving the applicability and reliability of the method provided in the present application in different scenarios. And, the above implementation method can achieve color registration calibration of multiple color toners through one execution process, without separately calibrating different color toners multiple times, taking less time and having higher execution efficiency.

[0095] In another embodiment of the present application, refer to Figure 9 , which is a schematic flowchart of an image color calibration method provided by an embodiment of the present application. As Figure 9 shown, the above S103 may further include:

[0096] S301, determining a target waveform region from the actual waveform signal, where the target waveform region includes at least one independent waveform.

[0097] S302, determining the offset degree of each color block on the color mixing area during imaging according to the comparison result of the waveform characteristics of the target waveform region and the waveform characteristics of a preset reference waveform.

[0098] In the embodiments of the present application, when the color mixing pattern includes black toner, if the color toners in each color mixing area completely overlap, when using a sensor to detect the toner concentration of each color mixing area in the color mixing image, due to the light absorption characteristics of the black toner, when the optical signal is emitted to the area covered by the black toner, the intensity of the optical signal reflected to the sensor through diffuse reflection is weak. At this time, as Figure 10 shown in FIG. 10A, the voltage value of the generated preset reference waveform signal is close to 0, and even, as Figure 10 shown in FIG. 10B, the voltage value is less than 0.

[0099] Based on the above characteristics of the black toner, in the embodiments of the present application, after generating the corresponding actual waveform signal, if the actual waveform signal includes an independent waveform region, it can be determined that there is an offset. Furthermore, based on the comparison result between the waveform characteristics of the target waveform region and the waveform characteristics of the preset reference waveform, the offset degree of each color block on the overprint region during imaging can be determined.

[0100] For ease of understanding, the implementation scenarios of the embodiments of the present application will be exemplified below in conjunction with the scenario diagrams.

[0101] Scenario Three

[0102] The overprint pattern includes black toner and any one of the color toners, such as K and M toners; or K and Y toners; or K and C toners. The implementation processes corresponding to each color combination are the same, and the present application will only take any one of them as an example for illustration.

[0103] For Scenario Three, based on the differences in the offset degrees between the color blocks in the overprint region, as Figure 11 shown in 11A, when the toners of two colors are completely overlapped, since the optical signal is absorbed by the black toner, therefore, the corresponding actual waveform signal is as Figure 12 shown in 12A. The voltage value of the convex region in this waveform signal will be less than or equal to the set threshold value, and this set threshold value is less than the voltage value corresponding to the detection of the concentration of any color toner, and can be 0 for example. At this time, the actual waveform signal is consistent with the preset reference waveform signal.

[0104] As Figure 11 shown in 11B, when the toners of two colors are not completely overlapped, since the optical signal is absorbed by the black toner, therefore, the voltage value corresponding to the overlapping region is less than the above set threshold value, and the voltage value corresponding to the non-overlapping region is greater than the above set threshold value. At this time, the corresponding waveform signal is as Figure 12 shown in 12B. This waveform signal includes an independent waveform. At this time, based on the comparison between the waveform width g1 of the independent waveform region and the waveform characteristics of the preset reference waveform, the offset degree of each color block on the overprint region during imaging can be determined. Among them, the waveform width of the independent waveform region of the preset reference waveform is 0.

[0105] Furthermore, in the embodiments of the present application, when performing color alignment calibration on the image forming device, different concentration values can also be set for different color toners. Then, the voltage values of the electrical signals obtained by detecting the toner concentrations of each color toner are different. Furthermore, it is convenient to distinguish different color toners through the voltage values of the waveform signals. Furthermore, based on the offset degree calculated above, targeted calibration can be performed on each color toner.

[0106] Through the above implementation method, when the image forming apparatus includes black toner, color registration can be achieved through a single transfer process, without the need to transfer and superimpose color images multiple times, which takes less time and has higher execution efficiency.

[0107] See Figure 13 FIG. is a schematic structural diagram of an image color calibration apparatus provided by an embodiment of the present application. As Figure 13 shown, the apparatus includes:

[0108] A transfer module 31, configured to obtain a superimposed color image on a transfer belt according to a obtained calibration image when performing color alignment calibration on an image forming apparatus; each superimposed color pattern in the calibration image is imaged using at least two color toners, and the color toners are aligned and stacked with each other during transfer.

[0109] A detection module 32, configured to detect the toner concentration of each superimposed color area in the superimposed color image to obtain an actual waveform signal corresponding to each superimposed color area; the superimposed color patterns in the calibration image correspond one-to-one to the superimposed color areas in the superimposed color image.

[0110] A determination module 33, configured to determine the offset degree of each color block during imaging on the superimposed color area according to a comparison result between the waveform feature of the actual waveform signal and the waveform feature of a preset reference waveform signal.

[0111] A calibration module 34, configured to perform color alignment calibration according to the offset degree.

[0112] As a possible implementation manner, the determination module 33 is specifically configured to determine a target waveform area from the actual waveform signal; the target waveform area is a waveform composed of at least one rising edge and at least one falling edge, and at least includes partial waveforms of each color block on the superimposed color area; according to a comparison result between the waveform feature of the target waveform area and the waveform feature of a preset reference waveform signal, determine the offset degree of each color block during imaging on the superimposed color area.

[0113] As a possible implementation manner, if there are two color blocks on the superimposed color area, and there is only one independent waveform in the target waveform area, and the independent waveform is a three-layer step waveform, it is determined that there is misalignment of each color block during imaging on the superimposed color area; obtain a first total waveform width of the independent waveform; according to the first total waveform width and the total waveform width of the preset reference waveform signal, obtain a first width difference, and determine the offset degree of each color block during imaging on the superimposed color area according to the first width difference.

[0114] As a possible implementation manner, the determining module 33 is further configured to, if there are only two color blocks on the color mixing area and there are two independent waveforms in the target waveform area, determine that the color blocks on the color mixing area are misaligned during imaging; obtain a first distance between adjacent rising edges, or adjacent falling edges, or central positions in the two independent waveforms; and determine the offset degree of each color block on the color mixing area during imaging based on the first distance and the waveform characteristics of a preset reference waveform signal.

[0115] As a possible implementation manner, the determining module 33 is specifically configured to, if there are only two color blocks on the color mixing area, there is only one independent waveform in the target waveform area, and the independent waveform is a three-layer stepped waveform, determine that the color blocks on the color mixing area are misaligned during imaging; obtain a first step width of the highest-layer stepped waveform, or obtain a first step distance between the rising edge of the lowest-layer stepped waveform and the rising edge of the highest-layer stepped waveform; and determine the offset degree of each color block on the color mixing area during imaging based on the first step width or the first step distance and the waveform characteristics of a preset reference waveform signal.

[0116] As a possible implementation manner, the color toner used by each color block on the color mixing area during imaging does not include black toner; the determining module 33 is further configured to, if there are three color blocks on the color mixing area, there is only one independent waveform in the target waveform area, and the independent waveform is a three-layer stepped waveform, determine that the color blocks on the color mixing area are misaligned during imaging; obtain a second total waveform width of the independent waveform; obtain a second width difference according to the second total waveform width and the total waveform width of a preset reference waveform signal, and determine the offset degree of each color block on the color mixing area during imaging according to the second width difference.

[0117] As a possible implementation manner, the color toner used by each color block on the color mixing area during imaging does not include black toner; the determining module 33 is further configured to, if there are three color blocks on the color mixing area, there is only one independent waveform in the target waveform area, and the independent waveform is a stepped waveform with at least three layers or more, determine that the color blocks on the color mixing area are misaligned during imaging; obtain a second step distance between the rising edge of the highest-layer stepped waveform and the rising edge of the lowest-layer stepped waveform on one side, and / or a third step distance between the falling edge of the highest-layer stepped waveform and the falling edge of the lowest-layer stepped waveform on the other side; and determine the offset degree of each color block on the color mixing area during imaging based on the second step distance, and / or the third step distance, and the waveform characteristics of a preset reference waveform signal.

[0118] As a possible implementation, the color toner used for each color block in the overprint area during imaging does not include black toner; the determination module 33 is further configured to determine that there is misalignment during imaging of each color block in the overprint area if there are three color blocks in the overprint area and there are more than two independent waveforms in the target waveform area; obtain the second distance between the rising edge of the first independent waveform and the rising edge of each subsequent independent waveform; and determine the offset degree of each color block in the overprint area during imaging according to the second distance and the waveform characteristics of the preset reference waveform signal.

[0119] As a possible implementation, when performing color alignment calibration on an image forming device, the concentrations of the color toners during imaging are different, and the voltage values of the electrical signals obtained by detecting the toner concentrations of the color toners are different.

[0120] Through the technical solution provided by the present application, color registration of an image forming apparatus can be achieved. Moreover, on the one hand, the above solution does not require black toner as a reference, and even when the black toner is exhausted, color registration can still be normally achieved; on the other hand, the above solution can achieve calibration of multiple color toners through single transfer, and the calibration efficiency is higher.

[0121] Corresponding to the above embodiment, the present application further provides an image forming device. Figure 14 FIG. is a schematic structural diagram of an image forming device provided by an embodiment of the present invention. The image forming device 400 may include: a processor 401, a memory 402, and a communication unit 403. These components communicate through one or more buses. Those skilled in the art can understand that the structure of the image forming device shown in the figure does not constitute a limitation on the embodiment of the present invention. It may be a bus structure, a star structure, and may also include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0122] Among them, the communication unit 403 is configured to establish a communication channel, so that the image forming device can communicate with other devices. Receive user data sent by other devices or send user data to other devices.

[0123] The processor 401 is the control center of the image forming device. It connects various parts of the entire image forming device using various interfaces and circuits. By running or executing software programs, instructions, and / or modules stored in the memory 402, and by calling data stored in the memory, it performs various functions of the image forming device and / or processes data. The processor may be composed of an integrated circuit (IC). For example, it may be composed of a single packaged IC, or it may be composed of multiple packaged ICs with the same or different functions connected together. For example, the processor 401 may include only a central processing unit (CPU). In the embodiments of the present invention, the CPU may be a single-core processor or may include multiple cores.

[0124] The memory 402 is used to store the execution instructions of the processor 401. The memory 402 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disc.

[0125] When the execution instructions in the memory 402 are executed by the processor 401, the image forming device 400 is enabled to execute Figure 1 Some or all of the steps in the illustrated embodiments.

[0126] In a specific implementation, the present invention also provides a computer storage medium. Among them, the computer storage medium can store a program, and when the program is executed, it can include some or all of the steps in the embodiments of the color calibration method provided by the present invention. The storage medium can be a magnetic disk, an optical disc, a read-only memory (ROM), or a random access memory (RAM), etc.

[0127] In a specific implementation, the present invention also provides a computer program product. Among them, the computer program product contains executable instructions, and when the executable instructions are executed on a computer, the computer is enabled to execute some or all of the steps in the embodiments of the color calibration method provided by the present invention.

[0128] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solutions in the embodiments of the present invention, in essence, or the parts that contribute to the prior art can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, disk, optical disc, etc., and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

[0129] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0130] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0131] Any process or method description in a flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a customized logic function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a way that is not shown or discussed in sequence, including in a substantially simultaneous manner or in the reverse order according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0132] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0133] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0134] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0135] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

[0136] The same or similar parts among the various embodiments in this specification can be referred to each other. In particular, for the device embodiments and the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. An image color calibration method, characterized in that, it includes: When performing color alignment calibration on an image forming device, obtaining a superimposed color image on a transfer belt according to a calibration image; each superimposed color pattern in the calibration image is imaged using at least two color toners, and each color toner is aligned and stacked with each other during transfer; Detecting the toner concentration of each superimposed color area in the superimposed color image to obtain an actual waveform signal corresponding to each superimposed color area; the superimposed color patterns in the calibration image correspond one by one to the superimposed color areas in the superimposed color image; Determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of a preset reference waveform signal; Performing color alignment calibration according to the offset degree.

2. The method according to claim 1, characterized in that, Determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of a preset reference waveform signal, including: Determining a target waveform area from the actual waveform signal; the target waveform area is a waveform composed of at least one rising edge and at least one falling edge, and at least includes partial waveforms of each color block on the superimposed color area; Determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal.

3. The method according to claim 2, characterized in that, Determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of a preset reference waveform signal, including: If there are two color blocks on the superimposed color area, and there is only one independent waveform in the target waveform area, and the independent waveform is a three-layer stepped waveform, it is determined that there is misalignment of each color block during imaging on the superimposed color area; Obtaining the first total waveform width of the independent waveform; According to the first total waveform width and the total waveform width of the preset reference waveform signal, obtaining a first width difference, and determining the offset degree of each color block during imaging on the superimposed color area according to the first width difference.

4. The method according to claim 2, characterized in that, Determining the offset degree of each color block during imaging on the superimposed color area according to the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of a preset reference waveform signal, further includes: If there are only two color blocks on the superimposed color area, and there are two independent waveforms in the target waveform area, it is determined that there is misalignment of each color block during imaging on the superimposed color area; Obtaining a first distance between adjacent rising edges, or adjacent falling edges, or central positions among the two independent waveforms; Based on the first distance and the waveform characteristics of the preset reference waveform signal, determining the offset degree of each color block during imaging on the superimposed color area.

5. The method according to claim 2, characterized in that, Determining the offset degree of each color block on the overprint area during imaging based on the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal further includes: If there are only two color blocks on the overprint area, and there is only one independent waveform in the target waveform area, and the independent waveform is a three-layer stepped waveform, it is determined that there is misalignment of each color block on the overprint area during imaging; Obtaining the first step width of the highest layer stepped waveform, or obtaining the first step distance between the rising edge of the bottom layer stepped waveform and the rising edge of the highest layer stepped waveform; Based on the first step width or the first step distance, and the waveform characteristics of the preset reference waveform signal, determining the offset degree of each color block on the overprint area during imaging.

6. The method according to claim 2, wherein, the color toner used for each color block on the overprint area during imaging does not include black toner; Determining the offset degree of each color block on the overprint area during imaging based on the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal further includes: If there are three color blocks on the overprint area, and there is only one independent waveform in the target waveform area, and the independent waveform is a three-layer stepped waveform, it is determined that there is misalignment of each color block on the overprint area during imaging; Obtaining the second total waveform width of the independent waveform; Based on the second total waveform width and the total waveform width of the preset reference waveform signal, obtaining a second width difference, and determining the offset degree of each color block on the overprint area during imaging according to the second width difference.

7. The method according to claim 2, wherein, the color toner used for each color block on the overprint area during imaging does not include black toner; Determining the offset degree of each color block on the overprint area during imaging based on the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal further includes: If there are three color blocks on the overprint area, and there is only one independent waveform in the target waveform area, and the independent waveform is a stepped waveform with at least three layers or more, it is determined that there is misalignment of each color block on the overprint area during imaging; Obtaining the second step distance between the rising edge of the highest layer stepped waveform and the rising edge of one side of the bottom layer stepped waveform, and / or the third step distance between the falling edge of the highest layer stepped waveform and the falling edge of the other side of the bottom layer stepped waveform; Based on the second step distance and / or the third step distance, and the waveform characteristics of the preset reference waveform signal, determining the offset degree of each color block on the overprint area during imaging.

8. The method according to claim 2, wherein, the color toner used for each color block on the overprint area during imaging does not include black toner; Determining the offset degree of each color block on the overprint area during imaging based on the comparison result between the waveform characteristics of the target waveform area and the waveform characteristics of the preset reference waveform signal further includes: If there are three on the color overlapping area and there are more than two independent waveforms in the target waveform area, it is determined that the color blocks on the color overlapping area are misaligned during imaging; Obtain the second distance between the rising edge of the first independent waveform and the rising edge of each subsequent independent waveform; Determine the offset degree of each color block on the color overlapping area during imaging according to the second distance and the waveform characteristics of the preset reference waveform signal.

9. The method according to any one of claims 1 to 8, characterized in that, the method further includes: When performing color alignment calibration on the image forming device, the concentrations of the color toners during imaging are different, and the voltage values of the electrical signals obtained by detecting the toner concentrations of the color toners are different.

10. An image color calibration device, characterized in that, comprising: A transfer module, which is used to obtain a color overlapping image on the transfer belt according to the acquired calibration image when performing color alignment calibration on the image forming device; at least two color toners are used for imaging each color overlapping pattern in the calibration image, and the color toners are aligned and stacked with each other during transfer; A detection module, which is used to detect the toner concentration of each color overlapping area in the color overlapping image to obtain the actual waveform signal corresponding to each color overlapping area; the color overlapping patterns in the calibration image correspond one-to-one with the color overlapping areas in the color overlapping image; A determination module, which is used to determine the offset degree of each color block on the color overlapping area during imaging according to the comparison result between the waveform characteristics of the actual waveform signal and the waveform characteristics of the preset reference waveform signal; A calibration module, which is used to perform color alignment calibration according to the offset degree.

11. An image forming device, characterized in that, It includes a memory for storing computer program instructions and a processor for executing the program instructions. When the computer program instructions are executed by the processor, the image forming device executes the method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the method according to any one of claims 1 to 9.

Images