CN209745832U - printed product detection equipment that single-camera multi-angle detected - Google Patents
printed product detection equipment that single-camera multi-angle detected Download PDFInfo
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Abstract
The utility model discloses a printing product check out test set that single camera multi-angle detected, the printing product check out test set that single camera multi-angle detected includes: the device comprises a controller (1), a conveyor belt (2), a product positioning unit, a multi-path image acquisition device (4), a signal transmission unit (5), a camera bracket (6) and a multi-path image detection device (7). The conveyor belt (2) is used for horizontally conveying a target product, the product positioning unit is used for positioning the product, and when the product reaches a specified position, a corresponding signal is sent to the controller (1); the multi-path image acquisition device (4) is used for shooting a target product from multiple angles, and the multi-path image acquisition device (4) is arranged on the camera bracket (6); the multi-path image detection device (7) is used for detecting a detected product based on the image acquired by the multi-path image acquisition device (4).
Description
Technical Field
The utility model relates to a lithography apparatus field, concretely relates to printing product check out test set that single camera multi-angle detected, the utility model discloses a check out test set mainly used detects the product that little, different angles have different pattern information.
Background
With the development of machine vision technology, machine vision is also more and more widely applied in the printing field, but when optical detection equipment detects printed matters, the optical detection equipment can only detect plane printing generally, and the detection effect of the optical detection equipment on products with obvious concave-convex information or multi-angle change information is not ideal.
DE 102005019533a1 describes a printing press and a method for producing individualized printed results on-line. Which employs an inline printing apparatus and an inline detection apparatus to identify errors. The faulty printed image is to be recognized directly after printing and assigned to the basic variable printed image data set. Such a faulty printed image can be marked and thrown out. However, the detection system in this patent uses 3 cameras to illuminate from different angles, which is costly, fixed at angle and limited in angle.
DE 102006012513a1 discloses an image processing system for a printing press which is suitable for checking static and variable image data. The variable content can be analyzed, for example, using so-called OCR technology. An evaluation unit for recognizing characters from a variable partial image of the printed product is connected to a data memory for generating the variable partial image data and compares the data of the evaluation unit with a data set which is used to control a variable printing press for the printed product of the examined partial image. Although the system can identify the variable information by ocr, the identification of the variable information is performed by a later-stage identification technology, the accuracy is limited, and the multi-angle concave-convex information cannot be reflected.
In short, although the above system can recognize a variable partial image of a printed product, the above system cannot realize multi-angle product detection with a concave-convex pattern or at low cost.
With the abundance of printed matters, the requirements on the printed matters are higher and higher, more and more printed matters with concave-convex information or fluorescent materials need to be printed and detected, and for parts of products with more abundant printed information, the results seen from different observation angles are different, so that the patterns formed from different angles are required to be detected in the printing process.
The existing system usually adopts a plurality of cameras to shoot and detect product images from different angles for multi-angle detection, but the mode is high in cost, higher in maintenance cost and inflexible in use, and different cameras need to be debugged respectively, so that automatic matching of parameters among the images collected by different cameras is difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a can adopt the single-lens to carry out the production line that the printed matter of a plurality of angles detected.
The technical scheme of the utility model as follows:
single-camera multi-angle printed product detection equipment is characterized in that the single-camera multi-angle printed product detection equipment
The printed product inspection apparatus includes: controller, conveyor belt, product positioning unit and multi-path image acquisition
A collection device, a signal transmission unit, a camera bracket and a multi-path image detection device,
The conveyor belt is used for horizontally conveying the target products,
the product positioning unit is used for positioning a product and sending a corresponding signal to the controller when the product reaches a specified position;
The multi-path image acquisition device is used for shooting a target product from multiple angles and is arranged on the camera bracket;
The multi-path image detection device is used for detecting a product to be detected based on the image acquired by the multi-path image acquisition device,
The multi-path image acquisition device, the multi-path image detection device and the product positioning unit are all connected with the controller, the controller starts the multi-path image acquisition device and the multi-path image detection device to detect products based on a signal that the products detected by the product positioning unit reach a specified position,
The multi-path image acquisition device comprises an industrial camera and a rotary receiving lens,
The camera bracket comprises an oval acquisition disc and a plurality of lens-reflector sets, wherein the lens-reflector sets are arranged at different positions of the oval acquisition disc, face the inspected product from different directions, and transmit images of the inspected product to the industrial camera through the rotary receiving lens.
The product branching device is arranged at the downstream of the conveyor belt and used for receiving a detection result of whether the detected product detected by the multi-path image detection device belongs to a defective product or not, branching is carried out on the detected product based on the detection result, the good product is output to the first output port, and the defective product is output to the second output port.
Furthermore, the waste recycling device is arranged at the second output port and used for receiving defective products.
Further, still include numbering unit, numbering unit sets up in the conveyer belt upstream for in proper order carries out the number to every product that conveys on the conveyer belt.
Furthermore, the camera shooting support is arranged above the conveying channel of the conveying belt and used for installing the multi-path image acquisition device.
Further, the multi-path image detection device adopts a machine learning algorithm to carry out quality detection on the multi-path images.
Further, the multi-path image acquisition device comprises a plurality of image receiving lenses and an area-array camera.
Further, the multi-path image acquisition device comprises a rotary receiving lens and an area-array camera.
advantageous effects
The utility model discloses a single-camera multi-angle printing product check out test set adopts multichannel image acquisition device to carry out the image shooting to being examined the product from the different angles of examining the product respectively, then detects the image of different angles respectively, can judge more accurately from being examined the product defect that the product openly can't be found, obtains the printing product of higher quality, having multi-angle information. The method can not be realized by various devices in the prior art, not only can the cost of the product be greatly reduced, but also the consistency of image parameters shot at different azimuth angles and pitch angles can be ensured, and the method is favorable for reducing the false detection rate.
Drawings
FIG. 1 is a schematic diagram of a single-camera multi-angle inspection apparatus according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a rotary receiving lens and a lens-reflector combination of the multi-path image capturing device 4 according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an elliptical collecting tray used in embodiment 1 of the present invention.
Detailed Description
The present invention is described in detail below with reference to the drawings and the embodiments thereof, but the scope of the present invention is not limited thereto.
example 1
As shown in fig. 1, the utility model discloses a printing product detects assembly line includes: the device comprises a controller 1, a conveyor belt 2, a product positioning and numbering device 3, a multi-path image acquisition device 4, a signal transmission unit 5, a camera bracket 6, a multi-path image detection device 7, a product branching device 8 and a waste recovery device 9.
The conveyor belt 2 is used for conveying a target product, mainly a printed product or a chip or the like.
the product positioning and numbering device 3 comprises a product positioning unit and a product numbering unit, and the numbering unit can carry out serial numbering on products on a production line when the products are ready to be printed or carry out numbering before detection after the products are printed. The positioning unit is arranged at the upstream of the conveyor belt or at a key station, the positioning unit can be arranged in a plurality of positions, each key station is arranged, and only one positioning unit can be arranged according to the conveying rule of the product conveyor belt. The product positioning and numbering device 3 is connected to the controller 1, and transmits a signal indicating that the numbered number and the printed matter have reached a predetermined position to the controller 1.
The multi-path image acquisition device 4 is used for shooting a target product from a plurality of angles, and the multi-path image acquisition device 4 is installed on the camera bracket 6. The positioning information determined by the product positioning and numbering device 3 is indirectly output to the image acquisition device 4 through the controller 2. For small products, in order to achieve more accurate positioning, the positioning unit may employ a position trigger disposed upstream of the optimal shooting position of the image capturing device 4, for example, a trigger of an infrared or other frequency band may be disposed, and the image capturing device 4 is controlled to perform image capturing once the product arrives.
The signal transmission unit 5 is connected with the multi-path image acquisition device 4 and the controller 1 and is used for signal transmission.
The camera bracket 6 is arranged above the conveying channel of the conveying belt and at the downstream of the product positioning and numbering device 3.
The multi-path image detection device 7 is used for detecting the product quality based on the images acquired by the multi-path images. The product detection can be carried out by comparing with a standard product, and can also be carried out by adopting a machine learning or characteristic extraction mode.
it should be noted that upstream and downstream are relative to the printing station. For each printed product, quality detection is required after the printing step is completed, and the visual inspection equipment performs image information analysis and detection on the acquired image information.
In addition, it should be noted that although the controller 1 and the multi-path image detection device 7 are described by using different reference numbers and device names in the embodiment, in the actual implementation process, the two devices may be implemented by using the same component, for example, the multi-path image detection device and the controller may be implemented by the same computer, or the multi-path image detection device is only one module of the controller 1.
The controller 1 or the multi-path image detection device can output a detection result after analyzing and comparing the image, control a waste removing treatment link according to the detection result, carry out shunting or direct waste removing on unqualified products, and carry out manual reinspection on the shunted or waste removed products.
The correlation between the rejection link and the detection link is the product number, and the product number can be calibrated based on the conveying position of the product, that is, the product is not marked by setting a marker on the product.
The controller 1 controls the product shunting or waste removing device to perform shunting or waste removing treatment on the defective products based on the detection result. Since the conveying speed of the conveyor belt is constant, once the controller 1 receives the positioning signal of the positioning unit and the corresponding product number, the target product is clear to the controller 1 at the basic position of the conveyor belt at any moment, so that after the number of the unqualified product is determined, the controller can clearly know the time when the defective target product moves to the range of the shunting or waste removing device, then send the waste removing signal to the shunting or waste removing device, convey the unqualified product to the waste product recycling device 9, complete the defect detection work of the printed product, and achieve the separation of the qualified product from the unqualified product. This can be achieved by the person skilled in the art by conventional means and will not be described in detail here.
Numbering is carried out every product through the numbering unit for every product on the assembly line generates unique product serial number, then calculates conveyer belt advancing speed (need carry out check many times among the actual operation process) through the controller and calculates, the utility model discloses can confirm the time that every product reachs any one station, need not carry out the secondary location to the product, practice thrift the cost, the in-process of rejecting does not need to pause, raises the efficiency.
With the abundance of printed matters, the requirements on the printed matters are higher and higher, more and more printed matters with concave-convex information, edge information or fluorescent materials need to be printed and detected, and for parts of products with more abundant printed information, the results seen from different observation angles are different, so that the patterns from different angles are required to be detected in the printing process.
At present, multi-station and multi-angle detection generally adopts the mode that a plurality of cameras shoot from different angles, and then shot images are respectively detected. However, this method is high in cost and low in equipment utilization rate, coordination control needs to be performed among multiple cameras, and since multiple cameras are unlikely to achieve consistency in performance parameters and other aspects, images shot by the cameras have effect differences, so that erroneous judgment can occur when a controller performs detection according to a uniform detection standard in an image detection process. Of course, the most important reason is the cost reason, and in each detection device, the cost of the industrial camera is often the highest, and if a plurality of cameras are adopted, the cost will be greatly increased.
To solve this problem, the present embodiment proposes an elliptical disk multi-angle multi-path image capturing device 4, where the multi-path image capturing device 4 includes an industrial camera 41 and a rotary receiving lens 42. The rotary receiving lens 22 includes a rotary housing 43, a barrel end lens 44, an in-barrel mirror 45, and preferably an in-barrel lens 46, which is capable of rotating in the vertical direction with respect to the acquisition coil (either rotating with the industrial camera 41 or stationary, later rotating the image, since the product size does not exceed the industrial camera). In this example, the camera support comprises an oval-shaped collection tray 61, which is fixed below the support 6. The collecting tray is arranged right above the conveyor belt, the long axis is perpendicular to the conveying direction of the conveyor belt, the short axis is along the central line direction of the conveyor belt, a plurality of groups of lens-reflector combinations 62 are arranged on the collecting tray around the oval frame (in the schematic diagram of the collecting tray in fig. 2, the lens-reflector combinations 62 are simplified, the detailed structure is shown in fig. 3), each group of lens-reflector combinations is arranged up and down, the lower focusing lens head 63 is used for receiving light from a product detection area and focusing the light towards the reflector 64, the focus is positioned in front of the reflector or behind the reflector (namely, the focus is not positioned on the reflector), in the embodiment, 3 groups of lens-reflectors are adopted, and 3 groups of lens-reflectors are respectively arranged at 3 end points (two short axis end points and 1 side long axis end point) of the oval. The light-emitting direction opposite rotation type receiving lens of top speculum, rotation type receiving lens includes rotary mechanism, vertical lens cone and slant lower lens cone two parts, rotary mechanism is the cavity structure, and the upper end is fixed in the camera lens below of industry camera, the lower extreme with vertical lens cone fixed connection can drive rotation type receiving lens uses vertical direction to rotate as the axle. The rotary receiving lens transmits the received light to a CCD of the industrial camera. Preferably, each mirror is coated with an antireflection film for visible light, especially the intermediate wavelength band of visible light.
In the aspect of the light source, the utility model discloses a light source adopts the LED array that sets up in oval collection dish below and arrange according to gathering the dish shape, and the LED front end sets up the diffuse transmission material to guarantee that illumination is more even, have the position of speculum on oval dish, do not arrange LED.
The biggest problem of single-lens multi-angle shooting is that if simultaneous shooting cannot be carried out, images shot from different angles are different in distance from a lens due to the fact that products on a conveyor belt must keep moving continuously and cannot stop due to detection, and therefore, the distances between the products and the lens are different when the images are shot from the upstream and the downstream of the conveyor belt, and industrial cameras often set parameters such as focal lengths and the like, so that the field ranges of the images received by a CCD are different, the definition of the images is different, and the difficulty of image processing and the probability of misjudgment are increased.
Preferably, this embodiment employs a particular configuration, namely an elliptical collection disk having a length 2b relationship between the length 2a of the major axis L and the length 2b of the minor axis W: a is 3 b/2. If the product is conveyed on the conveyor belt at a speed v, the length of the long axis of the collecting disc is 2a, the length of the short axis of the collecting disc is 2b, and the sampling frequency of the industrial camera is F (the sampling frequency is not the ultimate working frequency of the industrial camera and refers to the sampling times of the industrial camera in unit time of a target product set manually), the time of the rotary receiving lens rotating for 360 degrees is set to be 4(a-b)/v, the distance between adjacent products is more than or equal to 4(a-b), the sampling frequency of the industrial camera can be determined according to the number of reflector groups arranged in the range of 360 degrees, and if the number of the reflector groups is N, the sampling frequency is v/4N (a-b).
With this configuration, when the product under test is moving down from upstream, when the product is at the short axis midpoint below the elliptical acquisition disk (near the short axis midpoint upstream), the rotating receiver lens rotates to a position toward the furthest downstream of the elliptical acquisition disk, i.e., at the short axis downstream end of the ellipse, where the lens-mirror combination acts to reflect the image from the product to the acquisition camera.
When the product moves to the position right below the center of the acquisition disk, the rotary receiving lens rotates to the direction of the long axis endpoint of the side part of the oval acquisition disk, and the reflector positioned at the long axis endpoint plays a role in reflecting the image from the product to the acquisition camera.
after image acquisition is carried out at the position, the rotary receiving lens rotates to the lower reflector of the right-angle reflector group facing to the end point of the upstream short shaft, at the moment, the detected product is conveyed to the position right below the middle point of the downstream short shaft of the elliptic acquisition disc, and third-time image acquisition is finished at the position.
in the present embodiment, a group of lens-reflectors is respectively disposed at one end point of the major axis and two end points of the minor axis, but those skilled in the art can understand that a reflector group may be additionally disposed at the middle arc segment of the elliptical acquisition disk to achieve shooting at more angles, for example, a lens-reflector group is additionally disposed at an angle of 45 degrees, since the movement direction of the product is opposite to the rotation direction of the lens, the distance between the product and the lens can be kept approximately constant, and focusing of an industrial camera is not required.
In this way, the present embodiment realizes three times of photographing of the inspected product from three different angles by a single camera, and the distances of photographing of the inspected product from three times of photographing can be regarded as the same from an optical angle.
Next, the rotary receiving lens idles for a half cycle, returns to the downstream end position, and waits for the next product to be photographed. Since the general inspected products are all rectangular, the information of the side edges of the products and the information of different direction angles can be collected clearly from 3 different angles.
While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the above-described embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details in the embodiments do not constitute the limitations of the scope of the present invention, and any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention all fall within the protection scope of the present invention without departing from the spirit and scope of the present invention.
Claims (8)
1. the utility model provides a single-camera multi-angle detection's printed product check out test set which characterized in that, single-camera multi-angle printed product check out test set includes: a controller (1), a conveyor belt (2), a product positioning unit, a multi-path image acquisition device (4), a signal transmission unit (5), a camera bracket (6) and a multi-path image detection device (7),
The conveyor belt (2) is used for horizontally conveying target products,
the product positioning unit is used for positioning a product and sending a corresponding signal to the controller (1) when the product reaches a specified position;
The multi-path image acquisition device (4) is used for shooting a target product from multiple angles, and the multi-path image acquisition device (4) is arranged on the camera bracket (6);
The multi-path image detection device (7) is used for detecting a product to be detected based on the image acquired by the multi-path image acquisition device (4),
the multi-path image acquisition device (4), the multi-path image detection device (7) and the product positioning unit are all connected with the controller (1), the controller (1) starts the multi-path image acquisition device (4) and the multi-path image detection device (7) to detect products based on a signal that the products detected by the product positioning unit reach a designated position,
The multi-path image acquisition device comprises an industrial camera and a rotary receiving lens,
The camera bracket (6) comprises an oval acquisition disc and a plurality of lens-reflector sets, wherein the lens-reflector sets are arranged at different positions of the oval acquisition disc, face the inspected product from different directions, and transmit images of the inspected product to the industrial camera through the rotary receiving lens.
2. The single-camera multi-angle detection printed product detection device according to claim 1, further comprising a product branching device (8) disposed downstream of the conveyor belt (2) for receiving a detection result of whether the detected product detected by the multi-path image detection device (7) belongs to a defective product, and branching the detected product based on the detection result, wherein the good product is output to the first output port, and the defective product is output to the second output port.
3. The single-camera multi-angle detection printed product detection apparatus according to claim 2, further comprising a waste recycling device (9), wherein the waste recycling device (9) is disposed at the second output port for receiving a defective product.
4. the single-camera multi-angle inspection printed product inspection apparatus of claim 1, further comprising a numbering unit disposed upstream of the conveyor belt for sequentially numbering each product conveyed on the conveyor belt.
5. The single-camera multi-angle detection printed product detection apparatus according to claim 1, wherein the camera bracket (6) is disposed above the conveying passage of the conveyor belt (2) for mounting the multi-path image capturing device (4).
6. The single-camera multi-angle inspection printed product inspection apparatus according to claim 1, wherein the multi-path image inspection device (7) performs quality inspection on the multi-path images using a machine learning algorithm.
7. The single-camera multi-angle inspection printed product inspection apparatus according to claim 1, wherein the multi-path image capturing device (4) comprises a plurality of image receiving lenses and an area-array camera.
8. the single-camera multi-angle inspection printed product inspection apparatus according to claim 1, wherein the multi-path image capturing device (4) comprises a rotary receiving lens and an area-array camera.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822048809.8U CN209745832U (en) | 2018-12-07 | 2018-12-07 | printed product detection equipment that single-camera multi-angle detected |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822048809.8U CN209745832U (en) | 2018-12-07 | 2018-12-07 | printed product detection equipment that single-camera multi-angle detected |
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| CN209745832U true CN209745832U (en) | 2019-12-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638215A (en) * | 2020-06-04 | 2020-09-08 | 苏州乐佰图信息技术有限公司 | Image acquisition device based on telecentric lens |
| CN114697556A (en) * | 2022-04-12 | 2022-07-01 | 山东瑞邦自动化设备有限公司 | Rotary photographing method for flow production line |
| CN115468738A (en) * | 2022-10-31 | 2022-12-13 | 易思维（杭州）科技有限公司 | Measurement precision evaluation device and evaluation method of linear array camera measurement system |
| CN117911411A (en) * | 2024-03-19 | 2024-04-19 | 南京认知物联网研究院有限公司 | Computer vision detection method and device based on parallel detection of picture streams |
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2018
- 2018-12-07 CN CN201822048809.8U patent/CN209745832U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638215A (en) * | 2020-06-04 | 2020-09-08 | 苏州乐佰图信息技术有限公司 | Image acquisition device based on telecentric lens |
| CN114697556A (en) * | 2022-04-12 | 2022-07-01 | 山东瑞邦自动化设备有限公司 | Rotary photographing method for flow production line |
| CN114697556B (en) * | 2022-04-12 | 2023-06-06 | 山东瑞邦智能装备股份有限公司 | Rotary photographing method for line production line |
| CN115468738A (en) * | 2022-10-31 | 2022-12-13 | 易思维（杭州）科技有限公司 | Measurement precision evaluation device and evaluation method of linear array camera measurement system |
| CN115468738B (en) * | 2022-10-31 | 2024-02-27 | 易思维(杭州)科技股份有限公司 | Measurement precision evaluation device and evaluation method of linear array camera measurement system |
| CN117911411A (en) * | 2024-03-19 | 2024-04-19 | 南京认知物联网研究院有限公司 | Computer vision detection method and device based on parallel detection of picture streams |
| CN117911411B (en) * | 2024-03-19 | 2024-05-24 | 南京认知物联网研究院有限公司 | Computer vision detection method and device based on parallel detection of picture streams |
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