Ink droplet observation method, device and equipment suitable for multiple ink jet units and storage medium

Abstract

The invention discloses an ink droplet observation method, device and equipment suitable for multiple ink jet units and a storage medium, and the method comprises the steps: judging whether the abnormality of a shot picture needs to be analyzed or not according to the shot picture of the last abnormal picture of a target ink jet unit when the shot picture is obtained; if so, judging whether the shot picture is an abnormal picture or not according to whether the ink droplet image in the standard region set in the shot picture meets the set requirement or not; and if yes, judging whether the shooting picture is a clutter trigger picture or a result picture according to the nearest shooting picture of the target ink jet unit, and performing one-time ink droplet shooting on the target ink jet unit again when the shooting picture is determined to be the clutter trigger picture. According to the scheme, the ink droplet observation efficiency is effectively improved, the clutter triggering image can be filtered out before ink droplet parameter calculation and ink jet equipment state judgment are conducted through the shot image, and the precision of the ink droplet observation result is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of inkjet printing ink droplet observation, and in particular to an ink droplet observation method, device, equipment and storage medium applicable to multiple inkjet units. Background Art

[0002] In the field of inkjet printing technology, real-time monitoring of the ink droplet ejection status is an important link to ensure printing quality and stable operation of the equipment. In the existing technology, a high-speed camera is usually used to capture images of high-frequency ejected ink droplets, and by analyzing parameters such as the ink droplet shape and flight trajectory, problems such as inkjet unit blockage, ejection deflection or drive circuit abnormality are judged. In order to achieve effective observation, the inkjet trigger signal and the shooting trigger signal need to be strictly synchronized, that is, the controller needs to generate the same frequency inkjet action instructions and shooting instructions based on a unified high-frequency reference signal. However, since the maximum shooting frequency of the high-speed camera is much lower than the actual ejection frequency of the ink droplets, the controller usually needs to perform frequency division processing on the high-frequency trigger signal, and generate a down-frequency shooting signal through periodic sampling to meet the frame rate limit of the camera.

[0003] However, when noise signals are generated during the operation of the device due to electromagnetic interference, circuit noise, or impedance mismatch in the signal transmission path, if the amplitude of the noise is close to the sampling threshold of the effective trigger signal, it may be mistakenly identified by the controller as a valid trigger edge, causing the sampling moment of the shooting signal to deviate from the preset phase, resulting in missampling of the shooting signal. It is worth noting that since the inkjet trigger signal is directly related to the generation and ejection timing of ink droplets, its signal trigger logic usually has a strict noise suppression design, such as differential signal transmission, Schmitt trigger shaping, or redundant check mechanism, to ensure the timing accuracy of the inkjet action. In contrast, the generation logic of the shooting signal often relies only on simple frequency division and sampling circuits, lacks the ability to dynamically identify noise signals, and is prone to missampling of the shooting signal.

[0004] This type of missampling will directly cause the phase of the ink droplet image in the captured image by the camera to mismatch the actual injection phase. For example, the residual trajectory of the ink droplet in the incomplete formation stage or the flight path will be captured, which will cause errors in image feature extraction. The use of such ink droplet images in subsequent ink droplet information calculations and inkjet device status judgment may further lead to errors in calculation and judgment results, greatly reducing the detection or operation efficiency of the equipment and restricting the improvement of the accuracy of ink droplet observation. However, at the same time, if the captured image is analyzed for abnormalities every time to determine whether it is an error image caused by clutter signals, the detection efficiency of the equipment will be significantly reduced. Therefore, how to identify whether the captured image is a clutter-triggered image and how to balance the analysis timing of the clutter-triggered image need to be further improved in the future. Summary of the Invention

[0005] The present application provides an ink droplet observation method, device, equipment and storage medium suitable for a multi-inkjet unit, which can solve the problem in the prior art that the ink droplet observation efficiency is affected by shooting triggered by noise signals.

[0006] In a first aspect, the present invention provides an ink droplet observation method applicable to a multi-inkjet unit, which adopts the following technical solutions:

[0007] An ink droplet observation method applicable to a multi-inkjet unit, comprising:

[0008] When a captured image is acquired, judging whether it is necessary to perform an image abnormality analysis on the captured image acquired this time according to the most recent image abnormality captured by the target inkjet unit;

[0009] If not, determining that the photographed image is a result image, and responding to the next photographing signal according to the inkjet observation order of the multiple inkjet units; wherein the photographing order of the multiple inkjet units is established according to the number of photographs of each inkjet unit and the photographing order of each inkjet unit;

[0010] If necessary, judging whether the photographed image is an abnormal image based on whether the ink droplet image in the standard area set in the photographed image meets the set requirements;

[0011] When the photographed picture is not an abnormal picture, determining the photographed picture as a result picture, and responding to a next photographing signal according to the inkjet observation order of the multiple inkjet units;

[0012] When the shooting picture is an abnormal picture, the shooting picture is judged to be a noise trigger picture or a result picture based on the latest multiple shooting pictures of the target inkjet unit, and when it is determined that the shooting picture is a noise trigger picture, the response action of the next shooting signal is adjusted to re-execute an ink drop shooting on the target inkjet unit.

[0013] In combination with the first aspect, in one embodiment, judging whether it is necessary to perform an abnormality analysis on the captured image based on the most recent abnormal image of the target inkjet unit includes the following steps:

[0014] Determine whether any abnormal footage has been captured before;

[0015] If no abnormal picture has been obtained, it is determined that the abnormal picture analysis needs to be performed on the picture obtained this time;

[0016] If a shot with an abnormal image has been obtained, determine whether the interval between the most recent shot with an abnormal image and the shot obtained this time exceeds a set number;

[0017] When the number of intervals exceeds the set number, determining to perform abnormality analysis on the captured image;

[0018] If the interval number does not exceed the set number, it is determined not to perform abnormality analysis on the captured image acquired this time.

[0019] In combination with the first aspect, in one embodiment, determining whether the ink droplet image within the set standard area in the captured image meets the set requirements includes the following steps:

[0020] Determine whether there is an ink drop image in the standard area;

[0021] If it does not exist, it is determined to be an abnormal picture;

[0022] If it exists, determine whether the ink drop image in the standard area meets the set requirements. If it does not meet the set requirements, it is determined to be an abnormal picture; if it meets the set requirements, it is determined to be a result picture; the set requirements include that the completeness of the ink drop image reaches a set ratio, or that the area of the ink drop image in the standard area reaches a set ratio.

[0023] In combination with the first aspect, in one embodiment, in determining whether the ink droplet image within the standard area set in the captured image meets the set requirements,

[0024] The number of the standard areas in the shooting picture is consistent with the number of illumination times of the ink droplet illumination device within one exposure time of the shooting camera during the ink droplet observation process;

[0025] The length of the standard area in the direction of ink droplet flight is related to the ejection delay error of the inkjet unit and the illumination delay error during the ink droplet shooting process;

[0026] If there are multiple standard areas in the shooting picture, there are area intervals between the multiple standard areas, and the area intervals correspond to the flying distance of the ink droplet in the illumination interval.

[0027] In combination with the first aspect, in one embodiment, determining whether the captured image is a clutter trigger image or a result image based on a plurality of recent captured images of the target inkjet unit includes the following steps:

[0028] Acquire a set number of recent photographic images corresponding to the same inkjet unit as auxiliary analysis images;

[0029] Determining whether the auxiliary analysis screens are all abnormal screens;

[0030] If so, determining that the abnormal screen is a result screen;

[0031] If not, it is determined that the abnormal picture is a clutter triggered picture.

[0032] In combination with the first aspect, in one embodiment, determining, based on the auxiliary analysis screen, that the abnormal screen is the clutter trigger screen or the result screen, includes the following steps:

[0033] If the number of auxiliary analysis frames of the same inkjet unit is less than the set number, the captured frame is determined to be a pending frame.

[0034] In combination with the first aspect, in one embodiment, if the number of auxiliary analysis pictures of the same inkjet unit is less than the set number, after determining that the captured picture is a pending picture, the following steps are included:

[0035] If it is determined that any of the captured images is a result image or a clutter triggered image, the previous pending image is determined to be a result image or a clutter triggered image according to whether the result image is a normal image or an abnormal image.

[0036] In combination with the first aspect, in one embodiment, after responding to the next shooting signal according to the inkjet observation order of the multiple inkjet units, the method includes the following steps:

[0037] If the inkjet unit corresponding to the next shooting signal is different from the inkjet unit shot this time, the shooting camera is controlled to move relatively to the shooting position corresponding to the next inkjet unit.

[0038] In combination with the first aspect, in one embodiment, when a captured image is acquired, before determining whether it is necessary to perform image abnormality analysis on the captured image based on the most recent image abnormality of the target inkjet unit, the following steps are included:

[0039] Determine whether there was any clutter triggering image during the previous ink droplet observation process;

[0040] If it occurs, filter out the starting pulse width signal that is lower than the set signal pulse width; wherein the starting pulse width signal is one of the active trigger signal and the noise trigger signal;

[0041] According to a preset frequency division sampling model, determining whether to select the starting pulse width signal as the shooting signal; wherein the starting pulse width signal is one of an active trigger signal and a noise trigger signal;

[0042] After the shooting signal is acquired, the shooting camera is controlled to shoot the ink droplets ejected by the target inkjet unit according to the inkjet observation order of the multiple inkjet units to obtain a shooting picture.

[0043] In combination with the first aspect, in one embodiment, when a captured image is acquired, before determining whether it is necessary to perform image abnormality analysis on the captured image based on the most recent image abnormality of the target inkjet unit, the following steps are included:

[0044] If the initial pulse width signal lower than the set signal pulse width has been filtered out, the abnormal analysis of the shooting picture is shielded and the judgment step and subsequent steps are required.

[0045] In a second aspect, the present invention provides an ink droplet observation device suitable for a multi-inkjet unit, which adopts the following technical solution:

[0046] An ink droplet observation device suitable for a multi-inkjet unit, comprising:

[0047] an analysis need judgment module configured to, upon acquiring a captured image, determine whether an image abnormality analysis is required for the captured image based on the most recent captured image of the target inkjet unit showing an image abnormality; if not, determine the captured image as a result image and respond to the next capture signal in accordance with the inkjet unit inkjet observation sequence; wherein the multiple inkjet unit capture sequence is established based on the number of captures of each inkjet unit and the capture sequence of each inkjet unit;

[0048] an image abnormality judgment module configured to, if it is necessary to perform image abnormality analysis on the captured image, determine whether the captured image is an abnormal image based on whether the ink droplet images within a set standard area in the captured image meet set requirements; if the captured image is not an abnormal image, determine that the captured image is a result image and respond to the next capture signal according to the inkjet observation order of the multiple inkjet units;

[0049] The noise trigger judgment module is configured to judge whether the captured image is a noise trigger image or a result image based on the latest multiple captured images of the target inkjet unit when the captured image is an abnormal image, and adjust the response action of the next shooting signal to re-execute an ink drop shooting on the target inkjet unit when it is determined that the captured image is a noise trigger image.

[0050] In a third aspect, the present invention provides an ink droplet observation device suitable for a multi-inkjet unit, which adopts the following technical solution:

[0051] A device for observing ink droplets for use with multiple inkjet units, comprising a processor, a memory, and an ink droplet observation program for use with multiple inkjet units, the program being stored in the memory and executable by the processor. When the program is executed by the processor, the steps of the method for observing ink droplets for use with multiple inkjet units as described above are implemented.

[0052] In a fourth aspect, an embodiment of the present application provides a storage medium, which adopts the following technical solution:

[0053] A storage medium stores an ink droplet observation program applicable to a multi-inkjet unit, wherein when the ink droplet observation program applicable to the multi-inkjet unit is executed by a processor, the steps of the ink droplet observation method applicable to the multi-inkjet unit as described above are implemented.

[0054] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0055] After acquiring the captured image of ink droplet shooting, the present application further combines the most recent abnormal image of the target inkjet unit to first determine whether it is necessary to perform an abnormal analysis on the captured image; when it is determined that it is not necessary, the captured image can be directly used as the result image and the next ink drop shooting can be started to improve the efficiency of ink droplet observation; and when necessary, it can determine whether the ink droplet image in the captured image is normal. For abnormal images with abnormal ink droplet images, the application will further retrieve multiple recent captured images of the same inkjet unit during the current shooting process for auxiliary analysis, so as to determine whether the abnormal image is a clutter triggered image through multiple consecutive images, and finally filter out the clutter triggered image before using the captured image to calculate ink droplet parameters and determine the status of the inkjet device, thereby effectively improving the accuracy of the ink droplet observation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a schematic diagram of the overall process of an embodiment of an ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0057] Figure 2 Schematic diagram of the process of step S100 in one embodiment of the ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0058] Figure 3 2 is a flow chart of step 220 in an embodiment of an ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0059] Figure 4 Schematic diagram of the process of step S320 in an embodiment of the ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0060] Figure 5 Schematic diagram of analysis logic of step S320 in the first case in an embodiment of an ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0061] Figure 6 Schematic diagram of analysis logic of step S320 in the second case in an embodiment of an ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0062] Figure 7 Schematic diagram of the process of step S100 in one embodiment of the ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0063] Figure 8 This is a schematic diagram of related steps involved before step 100 in an embodiment of an ink droplet observation method applicable to a multi-inkjet unit of the present application;

[0064] Figure 9 This is a schematic diagram of functional modules in one embodiment of an ink droplet observation device applicable to a multi-inkjet unit of the present application;

[0065] Figure 10 This is a schematic diagram of the hardware structure of the ink droplet observation device applicable to multiple inkjet units involved in the embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] The embodiment of the present application provides an ink droplet observation method, device, equipment and storage medium suitable for multiple inkjet units. The key point of the invention is that after obtaining the shooting picture of the ink droplet shooting, it will be further combined with the shooting picture of the target inkjet unit with the most recent abnormal picture to first determine whether it is necessary to perform abnormal analysis on the shooting picture obtained this time; when it is determined that it is not necessary, the shooting picture can be directly used as the result picture and the next ink droplet shooting can be started to improve the ink droplet observation efficiency; and when necessary, it can be determined whether the ink droplet image in the shooting picture is normal. For abnormal pictures with abnormal ink droplet images, the most recent multiple shooting pictures of the same inkjet unit in the current shooting process will be further retrieved for auxiliary analysis, so as to realize the judgment of whether the abnormal picture this time is a noise triggering picture through multiple consecutive pictures, and finally the noise triggering picture can be filtered out before using the shooting picture to calculate the ink droplet parameters and judge the status of the inkjet device, thereby effectively improving the accuracy of the ink droplet observation results.

[0068] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0069] In a first aspect, an embodiment of the present application provides an ink droplet observation method applicable to a multi-inkjet unit.

[0070] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the ink droplet observation method applicable to multiple inkjet units of this application. Figure 1 As shown, the ink droplet observation method applicable to the multi-inkjet unit includes:

[0071] S100, when a captured image is acquired, judging whether it is necessary to perform an image abnormality analysis on the captured image acquired this time based on the most recent image abnormality captured by the target inkjet unit;

[0072] Specifically, refer to Figure 2 In this embodiment, step S100 includes the following steps:

[0073] S110, determining whether an abnormal picture has been captured before;

[0074] S121: If no abnormal picture has been obtained, determining that an abnormality analysis needs to be performed on the currently obtained picture;

[0075] S122: If a captured image with an abnormal image has been obtained, determine whether the interval between the most recent captured image with an abnormal image and the captured image obtained this time exceeds a set number of times;

[0076] S131, when the number of intervals exceeds the set number, determining that an abnormality analysis needs to be performed on the captured image acquired this time;

[0077] S132: If the number of intervals does not exceed the set number, it is determined that there is no need to perform abnormality analysis on the captured image acquired this time.

[0078] With this arrangement, after obtaining a picture of ink droplet shooting, it is further determined whether a picture with an abnormal image has been obtained before. If a picture with an abnormal image has not been obtained, it can be determined that there has been no situation in which a noise signal has triggered ink droplet shooting, and there has been no situation in which the inkjet unit has malfunctioned. In order to ensure that the interference of noise signals can be effectively filtered out in the future, it is necessary to continue to ensure that it is not affected by noise signals. Therefore, it is necessary to continue to analyze the picture abnormality of the picture obtained this time.

[0079] If an abnormal image has been captured before, although it is impossible to directly determine whether the abnormal image is a capture triggered by a noise signal or a normal capture caused by an inkjet unit failure, in order to effectively filter out the interference of noise signals, it is used as the starting point for whether to perform image abnormality analysis. Then, based on the number of intervals between the most recent abnormal image and the currently captured image, that is, the number of captured signals that have responded between the two, it is determined whether the timing of the current ink droplet capture is close to the timing of the previous ink droplet capture that may have been triggered by a noise signal.

[0080] Since the frequency of clutter signals is low, the probability of them appearing multiple times within a single shooting interval of the camera is relatively low. Furthermore, during the sampling process of the shooting signal, the probability of clutter signals being sampled to form the shooting signal is also relatively low. Therefore, the probability of clutter signals appearing continuously or appearing multiple times in a short period of time being sampled as the shooting signal is even lower. In this application, this situation will be deemed to be non-existent. Therefore, when the interval between the most recently captured abnormal image and the currently captured image is small, the currently captured image will be deemed not to be a captured image triggered by a clutter signal, and thus no abnormality analysis is required.

[0081] Finally, through the above two rounds of judgment process, and both rounds of judgment process are the retrieval and simple judgment of the results of the previous shooting pictures, the judgment process is simple and fast, and the time taken is greatly reduced compared to the abnormal analysis process of the shooting picture. Finally, it is achieved that when there is no need to perform abnormal analysis of the shooting picture, the abnormal analysis process can be smoothly reduced, the time of the ink droplet observation execution process of the inkjet equipment is compressed, and the overall ink droplet observation efficiency is effectively improved.

[0082] After step S100, the next step to be executed is further selected as S210 or S220 according to the judgment result.

[0083] S210: If not required, determine that the captured image is a result image, and respond to the next capture signal according to the inkjet observation order of the multiple inkjet units; wherein the multiple inkjet unit capture order is established according to the number of captures of each inkjet unit and the capture order of each inkjet unit;

[0084] For captured images that do not require image anomaly analysis, they will be directly determined as result images for subsequent ink drop parameter calculation and inkjet device status judgment. This also indicates that the current ink drop capture is completed. The next sampled capture signal will be responded to according to the multi-inkjet unit inkjet observation order. The multi-inkjet unit capture order is specifically established by the capture count and capture order of each inkjet unit. In this embodiment, after all capture counts of a single inkjet unit are completed, the next inkjet unit's ink drop capture will be performed.

[0085] S220: If necessary, judging whether the captured image is an abnormal image based on whether the ink droplet image within the set standard area in the captured image meets the set requirements;

[0086] Specifically, when step S220 analyzes and determines the ink droplet images in the captured image, it is understood that the purpose of this analysis and determination process is to identify abnormal images that differ from normal images. Different embodiments may have different ink droplet capture methods, and the definition of whether or not the set requirements are met may also vary in different embodiments. Therefore, different analysis and determination methods may be adopted for the above-mentioned analysis and determination process in different embodiments, and this application does not impose further limitations on this. For example, in some embodiments, a normal image is when the ink droplet image is within a set area of the captured image. Therefore, step S220 can be completed by determining whether the position of the ink droplet image in the captured image meets the set requirements.

[0087] In this embodiment, referring to Figure 3 Step S220 specifically includes the following steps:

[0088] S221, determining whether there is an ink droplet image in the standard area;

[0089] Specifically, each standard area is a continuous area range in the shooting picture, but in different embodiments, the number of standard areas in the shooting picture may be different, for example, there is only one standard area in the shooting picture, or multiple spaced standard areas, and the multiple spaced standard areas will be spaced apart and distributed in the flight direction of the ink droplets.

[0090] It should be further explained that during the ink droplet capture process, the trigger signal for triggering ink droplet capture will synchronously trigger the capture camera to perform exposure and the ink droplet illumination device to illuminate once or multiple times within the exposure cycle. In different embodiments, the number of illumination times performed by the ink droplet illumination device within one exposure time may vary, and the number of ink droplets in the captured image depends on the number of illumination times and the timing of the illumination times performed by the ink droplet illumination device. Therefore, the specific number of standard areas depends on the number of illumination times performed by the ink droplet illumination device within one exposure time of the capture camera during the ink droplet observation process in different embodiments. For example, if the ink droplet illumination device illuminates twice within one exposure time of the capture camera, two ink droplet images at different positions will appear in the captured image, and therefore two standard areas will be set accordingly.

[0091] There is also a spacing between adjacent standard areas. This spacing is calculated based on the time difference between two adjacent illuminations and the normal flight speed of the ink droplet. This spacing is the distance an ink droplet flies during a single illumination interval. The position of each standard area within the captured image depends on the delay between each illumination moment and the inkjet unit's inkjet moment within the exposure time. Because ink droplets exhibit a certain delay error during normal ejection, and this delay error can vary from one ejection to the next, and the ink droplet illumination device also exhibits a certain illumination delay error when triggering illumination, even when an ink droplet is ejected normally, its position within the captured image may vary slightly. Furthermore, the distance of the standard area in the droplet's flight direction is calculated in conjunction with the inkjet unit's ejection delay error after receiving the ejection signal and the illumination delay error of the ink droplet illumination device after receiving the illumination signal. Ultimately, the maximum possible time difference between the normal ejection of an ink droplet and each illumination moment is determined. Based on this time difference and the droplet's normal flight speed, the distance and distribution of the standard areas in the droplet's flight direction can be calculated.

[0092] Therefore, the number of standard areas in the shooting picture is consistent with the number of times the ink droplet lighting device is illuminated within one exposure time of the shooting camera during the ink droplet observation process; the length of the standard area corresponding to the ink droplet flight direction is related to the ejection delay error of the inkjet unit and the illumination delay error during the ink droplet shooting process; if there are multiple standard areas in the shooting picture, there are area intervals between the multiple standard areas, and the area intervals correspond to the flight distance of the ink droplet in the illumination interval.

[0093] After step S221, step S222 and step S223 are selected for execution based on the judgment result.

[0094] S222: If it does not exist, it is determined to be an abnormal picture;

[0095] When there is no ink droplet image in the standard area, it means that the inkjet unit does not eject ink droplets according to the normal state or time point. Therefore, there is a possibility that the inkjet device status is faulty or the ejection is triggered based on a noise signal. It needs to be treated as an abnormal image for further subsequent analysis.

[0096] S223, if it exists, determining whether the ink droplet image in the standard area meets the set requirements, if it does not meet the set requirements, determining it as an abnormal image; if it meets the set requirements, determining it as a result image;

[0097] The set requirements include that the integrity of the ink drop image reaches a set ratio, or that the area of the ink drop image within the standard area reaches a set ratio.

[0098] Specifically, the set requirements include that the outline completeness of the ink drop image reaches a set ratio, such as 80%, 90%, 100%, or the area proportion of the ink drop image in the standard area reaches a set ratio, such as 30%, 40%, 50%, etc.

[0099] After completing the screen abnormality determination in step S220, step S310 or step S320 is selected for execution according to the determination result.

[0100] S310: When the captured image is not an abnormal image, determining that the captured image is a result image, and responding to a next capture signal according to the inkjet observation order of the multiple inkjet units;

[0101] When the captured image is determined to be a normal image in step S100 , it indicates that the capture signal corresponding to the captured image is consistent with the preset phase when triggered, and is therefore a capture signal correctly obtained by frequency division sampling from the high-frequency trigger signal.

[0102] S320. When the shooting picture is an abnormal picture, the shooting picture is judged to be a noise triggering picture or a result picture based on the latest multiple shooting pictures of the target inkjet unit, and when it is determined that the shooting picture is a noise triggering picture, the response action of the next shooting signal is adjusted to re-execute an ink drop shooting on the target inkjet unit.

[0103] After determining that the captured image is an abnormal image, it is necessary to further analyze whether the abnormal cause of the abnormal image is due to an erroneous trigger phase of the noise signal or a problem with the inkjet device. Therefore, a certain number of previous captured images of the same inkjet unit during the current ink droplet capture process are retrieved and selected as auxiliary analysis images. The captured images obtained in these auxiliary analysis images correspond to a plurality of consecutive capture trigger signals of the capture camera. The set number may vary in different embodiments. In some embodiments, it may be set to one, and in other embodiments, it may be set to two or more. However, it should be noted that the setting of the set number is determined based on the frequency of noise formation in the ink droplet observation system and the probability of noise triggering the capture camera. Ultimately, the minimum number of abnormal images that can effectively distinguish between noise-triggered captures is the optimal set number. For example, in scenarios where noise frequently occurs within a certain period of time, the set number can be set to a larger value. In scenarios where noise is likely to occur less frequently and discontinuously, and there is little chance that noise will be sampled as a capture signal twice in a row, the set number can be set to one.

[0104] Specifically, refer to Figure 4 In this embodiment, when executing step S320, judging whether the captured image is a clutter trigger image or a result image based on the multiple recent captured images of the target inkjet unit, the following steps are included:

[0105] S321, obtaining a set number of recent photographic images corresponding to the same inkjet unit as auxiliary analysis images;

[0106] S322, determining whether the auxiliary analysis images are all abnormal images;

[0107] S323: If yes, determine that the abnormal screen is a result screen;

[0108] S324: If not, determine that the abnormal image is a clutter-triggered image.

[0109] Specifically, refer to Figure 5In the embodiment where the number is set to two, when the latest captured picture is an abnormal picture, the two previous pictures will be used as auxiliary analysis pictures. When the two previous pictures are also abnormal pictures, it means that the camera has captured abnormal pictures of ink droplets under three consecutive shooting signals (including the shooting signal corresponding to the latest picture). Combined with the accidental triggering of the noise signal and the relatively low probability that the noise signal is sampled as the shooting signal, the abnormal picture obtained by the camera when it deviates from the preset phase due to the accidental triggering of the noise signal is eliminated. It also means that the abnormal situation of the ink droplets in the shooting picture is a normal abnormality, that is, the inkjet device itself is in a problem state, such as the inkjet unit is clogged, etc., that is, it is determined that the shooting picture is a shooting signal triggered picture, and therefore it can be directly determined as the result picture.

[0110] Further, refer to Figure 5 and Figure 6 For an inkjet device that has just started ink droplet observation, when a captured image is confirmed as an abnormal image, there may be a small number of captured images before it or no earlier captured images, which does not meet the number of auxiliary analysis images selected in step S320. As a result, further analysis of the captured images to determine whether they are triggered by clutter cannot be performed. Therefore, in order to prevent such captured images from participating in subsequent ink droplet information calculation and inkjet device status judgment in this case, in some embodiments, step S320 further includes the following steps:

[0111] S3201: If the number of auxiliary analysis pictures of the same inkjet unit is less than the set number, determine that the captured picture is a pending picture.

[0112] This setting can clarify the status of some captured images that are judged to be abnormal but cannot be analyzed as clutter-triggered images, thereby preventing them from participating in subsequent ink drop information calculation and inkjet device status judgment.

[0113] In addition, in order to smoothly analyze whether the image to be determined is a clutter-triggered image or a normal image triggered by a shooting signal, the present application further includes the following steps after step 3201:

[0114] If it is determined that any of the captured images is a result image, the previous pending image is determined to be a result image or a clutter triggered image according to whether the result image is a normal image or an abnormal image.

[0115] Specifically, refer to Figure 5 and Figure 6In an embodiment where the number of images is set to two, if the first two images captured during the ink droplet observation process are abnormal images, they will not be confirmed as noise-triggered images or capture-triggered images in step S300 and will therefore be confirmed as pending images. When the third image is captured, if the image is normal, it will be directly confirmed as a capture-signal-triggered image. This eliminates the possibility that the previous pending images were abnormal images due to a problem with the inkjet device, and thus the previous two pending images can be confirmed as noise-triggered images. If the third image is determined to be an abnormal image, since the previous two pending images are also abnormal images, this image will be further confirmed as a result of a problem with the inkjet device. Therefore, the first two pending images can also be confirmed as capture-signal-triggered images.

[0116] Furthermore, in the above process, if it is determined that the next capture signal is being responded to according to the inkjet observation order of the multiple inkjet units, a further determination is made as to whether the inkjet unit corresponding to the next capture signal is different from the inkjet unit corresponding to the current capture image. If they are different, to ensure that the capture camera can successfully capture the next nozzle, it is necessary to control the capture camera to move relative to the capture position corresponding to the next inkjet unit. In different embodiments, this process can involve controlling the capture camera to move, the inkjet unit to move, or both the inkjet unit and the capture camera to move; in this embodiment, it is preferred to control the next inkjet unit to move to the corresponding capture camera.

[0117] Further, refer to Figure 7 In some embodiments, step S100, based on the most recent abnormal image captured by the target inkjet unit, determines whether it is necessary to perform an abnormality analysis on the captured image, including the following steps:

[0118] S101, determining whether the last captured image and the currently captured image are images captured by the same inkjet unit;

[0119] S102: If not, skip the judgment steps required for abnormality analysis, i.e., steps S110-S132, and directly confirm that abnormality analysis is required for the captured image;

[0120] S103: If yes, perform the judgment steps required for abnormality analysis.

[0121] This configuration requires controlling the capture camera or inkjet unit to move before capturing an image. This process also involves signal transmission between mechanical components in the inkjet device's control system. These components share power or ground lines with the inkjet device, and the signal noise generated during operation may intrude into the control system via common-mode coupling paths, ultimately appearing as noise signals during the capture signal sampling process. Therefore, after controlling the capture camera or inkjet unit to move, the probability of noise signals triggering capture is relatively high. At this point, if the determination of whether to perform anomaly analysis of the captured image is still based on the previous captured image, it is easy to miss the noise image. To this end, step S101 is used to first determine whether the current captured image and the previous captured image are of the same inkjet unit. If not, this indicates that the current captured image is the first captured image after the inkjet unit has moved relative to each other, which carries a relatively high noise risk. In this case, the abnormality analysis determination step is skipped, and the captured image is directly analyzed for abnormality. Otherwise, the previous abnormality analysis determination step is still used to determine whether an abnormality analysis of the captured image is necessary, thereby maximizing the ink droplet observation efficiency of the inkjet device.

[0122] Further, in some embodiments, referring to Figure 8 Step S100, when a captured image is acquired, before determining whether it is necessary to perform image abnormality analysis on the captured image acquired this time based on the most recent image abnormality captured image of the target inkjet unit, includes the following steps:

[0123] S010, determining whether a clutter triggering image has appeared during the previous ink droplet observation process;

[0124] S020. If it occurs, filter out the starting pulse width signal that is lower than the set signal pulse width; wherein the starting pulse width signal is one of an active trigger signal and a noise trigger signal;

[0125] Specifically, the starting pulse width signal is normally triggered by the relevant industrial control equipment during the ink droplet observation process. It can also be a noise trigger signal generated within the control circuit after interference from noise. Therefore, if a noise trigger image has been detected during the ink droplet observation process, the starting pulse width signal with a pulse width lower than the set signal pulse width can be directly filtered out in the subsequent process, thereby shielding the noise trigger signal at the source, ensuring that subsequent noise trigger signals do not interfere with the normal sampling of the capture signal, thereby ensuring the normal capture of the camera.

[0126] S030, judging whether to select the starting pulse width signal as the shooting signal according to a preset frequency division sampling model;

[0127] Specifically, the frequency division sampling model is used to extract a starting pulse width signal from multiple starting pulse width signals within each set period as a shooting signal, thereby reducing the frequency of the shooting signal, thereby ensuring that the shooting limit can meet the maximum shooting frequency of the shooting camera.

[0128] S040, after acquiring the shooting signal, controlling the shooting camera to shoot the ink droplets ejected by the target inkjet unit according to the inkjet observation order of the multiple inkjet units to obtain a shooting picture;

[0129] Furthermore, in some embodiments, when a captured image is acquired in step S100, before determining whether it is necessary to perform image abnormality analysis on the captured image acquired this time based on the most recent image abnormality captured by the target inkjet unit, the following steps are included:

[0130] If the initial pulse width signal lower than the set signal pulse width has been filtered out, the abnormal analysis of the shooting picture is shielded and the judgment step and subsequent steps are required.

[0131] With this arrangement, after the signal pulse width filtering operation has been performed, the situation where the noise trigger signal affects the shooting picture is eliminated in advance. Therefore, in this implementation, the abnormal analysis judgment step and subsequent steps of the shooting picture will no longer be performed, and the shooting picture will be directly confirmed as the result picture, thereby greatly improving the ink droplet observation efficiency of multiple nozzles.

[0132] In a second aspect, an embodiment of the present application further provides an ink droplet observation device suitable for a multi-inkjet unit.

[0133] In one embodiment, referring to Figure 9 , Figure 9 This is a functional module diagram of an embodiment of an ink droplet observation device applicable to multiple inkjet units of the present application. Figure 9 As shown, the ink drop observation device suitable for the multi-inkjet unit includes:

[0134] an analysis need judgment module configured to, upon acquiring a captured image, determine whether an image abnormality analysis is required for the captured image based on the most recent captured image of the target inkjet unit showing an image abnormality; if not, determine the captured image as a result image and respond to the next capture signal in accordance with the inkjet unit inkjet observation sequence; wherein the multiple inkjet unit capture sequence is established based on the number of captures of each inkjet unit and the capture sequence of each inkjet unit;

[0135] an image abnormality judgment module configured to, if it is necessary to perform image abnormality analysis on the captured image, determine whether the captured image is an abnormal image based on whether the ink droplet images within a set standard area in the captured image meet set requirements; if the captured image is not an abnormal image, determine that the captured image is a result image and respond to the next capture signal according to the inkjet observation order of the multiple inkjet units;

[0136] The noise trigger judgment module is configured to judge whether the captured image is a noise trigger image or a result image based on the latest multiple captured images of the target inkjet unit when the captured image is an abnormal image, and adjust the response action of the next shooting signal to re-execute an ink drop shooting on the target inkjet unit when it is determined that the captured image is a noise trigger image.

[0137] Among them, the functional implementation of each module in the above-mentioned ink droplet observation device applicable to multiple inkjet units corresponds to the various steps in the above-mentioned ink droplet observation method embodiment applicable to multiple inkjet units, and their functions and implementation processes will not be repeated here one by one.

[0138] In a third aspect, an embodiment of the present application provides an ink droplet observation device suitable for multiple inkjet units. The ink droplet observation device suitable for multiple inkjet units can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0139] Reference Figure 10 , Figure 10 Schematic diagram of the hardware structure of the ink droplet observation device applicable to multiple inkjet units involved in the embodiment of the present application. In the embodiment of the present application, the ink droplet observation device applicable to multiple inkjet units may include a processor, a memory, a communication interface, and a communication bus.

[0140] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0141] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, used to interconnect components within the ink droplet observation device for multiple inkjet units, as well as interfaces used to interconnect the ink droplet observation device for multiple inkjet units with other devices (e.g., other computing devices or user devices). Physical interfaces can include Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user devices can include displays, keyboards, etc.

[0142] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0143] The processor may be a general-purpose processor that can call an ink droplet observation program for multiple inkjet units stored in a memory and execute the ink droplet observation method for multiple inkjet units provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the ink droplet observation program for multiple inkjet units is called can be referred to in the various embodiments of the ink droplet observation method for multiple inkjet units of the present application and will not be further described here.

[0144] Those skilled in the art will understand that Figure 10 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0145] In a fourth aspect, an embodiment of the present application also provides a storage medium.

[0146] The storage medium of the present application stores an ink droplet observation program applicable to multiple inkjet units, wherein when the ink droplet observation program applicable to multiple inkjet units is executed by a processor, the steps of the ink droplet observation method applicable to multiple inkjet units as described above are implemented.

[0147] Among them, the method implemented when the ink droplet observation program applicable to multiple inkjet units is executed can refer to the various embodiments of the ink droplet observation method applicable to multiple inkjet units in this application, and will not be repeated here.

[0148] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0149] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0150] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0151] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0152] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0153] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0154] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for observing ink droplets in a multi-inkjet unit, characterized in that: It includes: When a captured image is acquired, judging whether it is necessary to perform an image abnormality analysis on the captured image acquired this time according to the most recent image abnormality captured by the target inkjet unit; If not, determining that the photographed image is a result image, and responding to the next photographing signal according to the inkjet observation order of the multiple inkjet units; wherein the photographing order of the multiple inkjet units is established according to the number of photographs of each inkjet unit and the photographing order of each inkjet unit; If necessary, judging whether the photographed image is an abnormal image based on whether the ink droplet image in the standard area set in the photographed image meets the set requirements; When the photographed picture is not an abnormal picture, determining the photographed picture as a result picture, and responding to a next photographing signal according to the inkjet observation order of the multiple inkjet units; When the shooting picture is an abnormal picture, the shooting picture is judged to be a noise trigger picture or a result picture based on the latest multiple shooting pictures of the target inkjet unit, and when it is determined that the shooting picture is a noise trigger picture, the response action of the next shooting signal is adjusted to re-execute an ink drop shooting on the target inkjet unit.

2. The ink droplet observation method applicable to a multi-inkjet unit according to claim 1, characterized in that: The determining whether it is necessary to perform an abnormality analysis on the captured image based on the most recent abnormal image of the target inkjet unit comprises the following steps: Determine whether any abnormal footage has been captured before; If no abnormal picture has been obtained, it is determined that the abnormal picture analysis needs to be performed on the picture obtained this time; If a shot with an abnormal image has been obtained, determine whether the interval between the most recent shot with an abnormal image and the shot obtained this time exceeds a set number; When the number of intervals exceeds the set number, determining to perform abnormality analysis on the captured image; If the interval number does not exceed the set number, it is determined not to perform abnormality analysis on the captured image acquired this time.

3. The ink droplet observation method applicable to a multi-inkjet unit according to claim 1, characterized in that: The determining whether the ink droplet image within the set standard area in the captured image meets the set requirements comprises the following steps: Determine whether there is an ink drop image in the standard area; If it does not exist, it is determined to be an abnormal picture; If it exists, determine whether the ink drop image in the standard area meets the set requirements. If it does not meet the set requirements, it is determined to be an abnormal picture; if it meets the set requirements, it is determined to be a result picture; the set requirements include that the completeness of the ink drop image reaches a set ratio, or that the area of the ink drop image in the standard area reaches a set ratio.

4. The ink droplet observation method applicable to a multi-inkjet unit according to claim 3, characterized in that: In the step of judging whether the ink droplet image in the standard area set in the shooting picture meets the set requirements, The number of the standard areas in the shooting picture is consistent with the number of illumination times of the ink droplet illumination device within one exposure time of the shooting camera during the ink droplet observation process; The length of the standard area in the direction of ink droplet flight is related to the ejection delay error of the inkjet unit and the illumination delay error during the ink droplet shooting process; If there are multiple standard areas in the shooting picture, there are area intervals between the multiple standard areas, and the area intervals correspond to the flying distance of the ink droplet in the illumination interval.

5. The ink droplet observation method applicable to a multi-inkjet unit according to claim 1, characterized in that: The method of determining whether a captured image is a clutter trigger image or a result image based on a plurality of recent captured images of the target inkjet unit comprises the following steps: Acquire a set number of recent photographic images corresponding to the same inkjet unit as auxiliary analysis images; Determining whether the auxiliary analysis screens are all abnormal screens; If so, determining that the abnormal screen is a result screen; If not, it is determined that the abnormal picture is a clutter triggered picture.

6. The ink droplet observation method applicable to a multi-inkjet unit according to claim 5, characterized in that: The step of determining whether the abnormal image is the clutter trigger image or the result image according to the auxiliary analysis image comprises the following steps: If the number of auxiliary analysis frames of the same inkjet unit is less than the set number, the captured frame is determined to be a pending frame.

7. The ink droplet observation method applicable to a multi-inkjet unit according to claim 6, characterized in that: If the number of auxiliary analysis pictures of the same inkjet unit is less than the set number, after determining that the photographed picture is a pending picture, the following steps are included: If it is determined that any of the captured images is a result image or a clutter triggered image, the previous pending image is determined to be a result image or a clutter triggered image according to whether the result image is a normal image or an abnormal image.

8. The ink droplet observation method applicable to a multi-inkjet unit according to claim 1, characterized in that: After responding to the next shooting signal according to the inkjet observation order of the multiple inkjet units, the method includes the following steps: If the inkjet unit corresponding to the next shooting signal is different from the inkjet unit shot this time, the shooting camera is controlled to move relatively to the shooting position corresponding to the next inkjet unit.

9. The ink droplet observation method applicable to a multi-inkjet unit according to claim 1, characterized in that: When the captured image is acquired, before determining whether it is necessary to perform image abnormality analysis on the captured image acquired this time based on the most recent image abnormality captured by the target inkjet unit, the following steps are included: Determine whether there was any clutter triggering image during the previous ink droplet observation process; If it occurs, filter out the starting pulse width signal that is lower than the set signal pulse width; wherein the starting pulse width signal is one of the active trigger signal and the noise trigger signal; According to a preset frequency division sampling model, determining whether to select the starting pulse width signal as the shooting signal; wherein the starting pulse width signal is one of an active trigger signal and a noise trigger signal; After the shooting signal is acquired, the shooting camera is controlled to shoot the ink droplets ejected by the target inkjet unit according to the inkjet observation order of the multiple inkjet units to obtain a shooting picture.

10. The ink droplet observation method applicable to a multi-inkjet unit according to claim 9, characterized in that: When the captured image is acquired, before determining whether it is necessary to perform image abnormality analysis on the captured image acquired this time based on the most recent image abnormality captured by the target inkjet unit, the following steps are included: If the initial pulse width signal lower than the set signal pulse width has been filtered out, the abnormal analysis of the shooting picture is shielded and the judgment step and subsequent steps are required.

11. An ink droplet observation device suitable for a multi-inkjet unit, characterized in that: It includes: an analysis need judgment module configured to, upon acquiring a captured image, determine whether an image abnormality analysis is required for the captured image based on the most recent captured image of the target inkjet unit showing an image abnormality; if not, determine the captured image as a result image and respond to the next capture signal in accordance with the inkjet unit inkjet observation sequence; wherein the multiple inkjet unit capture sequence is established based on the number of captures of each inkjet unit and the capture sequence of each inkjet unit; an image abnormality judgment module configured to, if it is necessary to perform image abnormality analysis on the captured image, determine whether the captured image is an abnormal image based on whether the ink droplet image within a set standard area in the captured image meets set requirements; When the photographed picture is not an abnormal picture, determining the photographed picture as a result picture, and responding to a next photographing signal according to the inkjet observation order of the multiple inkjet units; The noise trigger judgment module is configured to judge whether the captured image is a noise trigger image or a result image based on the latest multiple captured images of the target inkjet unit when the captured image is an abnormal image, and adjust the response action of the next shooting signal to re-execute an ink drop shooting on the target inkjet unit when it is determined that the captured image is a noise trigger image.

12. An ink droplet observation device suitable for a multi-inkjet unit, characterized in that: The ink droplet observation device suitable for multiple inkjet units includes a processor, a memory, and an ink droplet observation program suitable for multiple inkjet units stored on the memory and executable by the processor, wherein when the ink droplet observation program suitable for multiple inkjet units is executed by the processor, the steps of the ink droplet observation method suitable for multiple inkjet units as described in any one of claims 1 to 9 are implemented.

13. A storage medium, characterized in that: The storage medium stores an ink droplet observation program applicable to multiple inkjet units, wherein when the ink droplet observation program applicable to multiple inkjet units is executed by a processor, the steps of the ink droplet observation method applicable to multiple inkjet units as claimed in any one of claims 1 to 9 are implemented.

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