CN110852994A - Visual detection method and system for jet printing card - Google Patents
Visual detection method and system for jet printing card Download PDFInfo
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- CN110852994A CN110852994A CN201910976288.9A CN201910976288A CN110852994A CN 110852994 A CN110852994 A CN 110852994A CN 201910976288 A CN201910976288 A CN 201910976288A CN 110852994 A CN110852994 A CN 110852994A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
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- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30144—Printing quality
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Abstract
The invention discloses a visual detection method and a system of a jet printing card, wherein the visual detection method comprises the following steps: carrying out initialization processing; identifying and judging pixel points; after the image is divided, distributing the image to different computers according to the type of the divided area image to realize synchronous detection; comparing chip data and sorting and rejecting; and orderly retrieval steps are adopted to sequentially retrieve, unqualified products are immediately eliminated during the retrieval, the detection time is shortened, and the detection accuracy is improved.
Description
Technical Field
The invention relates to the field of image detection, in particular to a visual detection method and a visual detection system for a jet printing card.
Background
In the past, after the spray printing of a card is finished, workers judge whether the spray printing card has error conditions such as missing printing, deviation, scratching, black spots and the like through human eyes, but generally judge that subjective factors exist, the accuracy rate is low, the error check and the missing check are easy to occur, meanwhile, the labor cost is high, the time spent is large, time and labor are wasted, and the economic efficiency is low. With the rise of image detection applications, the application of image detection to the qualification detection of inkjet printing cards is a trend, but the problems of low detection accuracy and long time consumption still exist.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a visual detection method and a system for a jet printing card, which can improve the detection accuracy and reduce the detection time.
The technical scheme adopted by the invention for solving the problems is as follows:
in a first aspect of the present invention, a visual inspection method for an inkjet printed card includes the following steps:
initializing the input card image;
judging whether the difference result of the initialized card image and the initialized printing data image meets the standard or not in a pixel point identification mode; if the card image is not matched with the printed card image, the spraying printed card corresponding to the card image is rejected by the sorting device;
carrying out image segmentation on the initialized card image according to the printing area of the printing data image, and then sending the segmented image to different computers for synchronous detection according to the type of the segmented image; if the card image is not matched with the printed card image, the spraying printed card corresponding to the card image is rejected by the sorting device; the types of the segmented images comprise one-dimensional codes, two-dimensional codes, human faces, photos and characters;
reading chip data of the jet printing card and comparing the chip data with source data; if the card is not qualified, the sorting device rejects the jet printing card;
the method for judging whether the difference result of the initialized card image and the initialized print data image meets the standard or not through the pixel point identification mode comprises the following steps:
performing Gaussian blur and binarization processing on the initialized card image and the initialized print data image;
scaling the initialized card image to the same resolution as the print data image;
calculating the difference value between each pixel corresponding to the initialized card image and the print data image;
and judging whether the difference meets the standard or not according to the difference result.
The visual detection method of the spray printed card has the advantages that the initial processing, namely pixel point identification, is carried out on the input card image to judge whether the whole card image has missing printing and offset phenomena, if the card image does not accord with the standard, the corresponding spray printed card is immediately removed, the next detection is not carried out, and the detection time is reduced; then, the card image is divided into a plurality of areas, the areas are sent to different computers for synchronous detection according to the type of each area, and the computers perform synchronous detection and finish detection of individual types respectively, so that the detection time is reduced; the vertical mark of the jet printing card which does not meet the standard is removed; and finally, detecting the chip data of the jet printing card. The steps are orderly, the whole detection is firstly carried out, then the detection of the divided areas is carried out, and finally the chip data detection with the lowest error rate is carried out, so that the detection time is further shortened and the detection accuracy is improved.
According to the first aspect of the present invention, the initialization processing for the input card image includes the steps of:
identifying and cutting out an image area of the jet printing card from the input card image;
rotating the image area of the jet printing card to enable the image area to be in the same direction as the image area of the print data;
the image area of the inkjet printed card is extended and overlaid with a background cloth.
According to the first aspect of the present invention, the image segmentation is specifically: and reading the coordinates of the printing area of the printing data image, and dividing the initialized card image according to the coordinates.
According to the first aspect of the present invention, the detecting the image of which the type is a human face includes the steps of:
constructing a first histogram of an image of which the type is a human face, and normalizing the first histogram;
constructing a second histogram of the face image in the print data image, and normalizing the second histogram;
and comparing the first histogram with the second histogram to obtain the similarity of the histograms.
According to the first aspect of the present invention, the detecting the image of which the type is a photograph is specifically:
extracting a first image feature of an image of which the type is a photograph and a second image feature of a photograph image in the print data image;
correspondingly comparing the first image feature and the second image feature;
wherein the first image feature and the second image feature each comprise an edge and a pixel color of a photograph.
In a second aspect of the present invention, a visual inspection system for inkjet printed cards comprises:
the conveying belt is used for conveying the jet printing cards;
the camera is used for collecting a card image of the jet printing card;
the card reader is used for reading chip data of the jet printing card;
the sorting device is used for removing the jet printing cards which do not meet the standard;
an overall processor, comprising:
the initialization module is used for initializing the input card image;
the pixel point identification module is used for judging whether the difference result of the initialized card image and the initialized print data image meets the standard or not in a pixel point identification mode;
the image segmentation module is used for carrying out image segmentation on the initialized card image according to the printing area of the printing data image and distributing the segmented image according to the type of the segmented image; the types of the segmented images comprise one-dimensional codes, two-dimensional codes, human faces, photos and characters;
the chip data comparison module is used for comparing the chip data of the jet printing card with the source data;
the result sending module is used for sending the detection result of the jet printing card to the sorting device;
a plurality of computers for synchronously detecting the segmented images;
wherein, the pixel point identification module comprises:
the preliminary processing unit is used for carrying out Gaussian blur and binarization processing on the initialized card image and the initialized print data image;
the zooming unit is used for zooming the initialized card image to the resolution ratio same as that of the printing data image;
the difference value calculating unit is used for calculating the difference value between each pixel corresponding to the initialized card image and the print data image;
and the judging unit is used for judging whether the standard is met or not according to the difference result.
The visual detection system for the spray printed cards has the advantages that the pixel point identification module performs initialization processing on input card images, namely pixel point identification, judges whether the whole card images have missing printing and offset phenomena, and enables the sorting device to immediately reject the corresponding spray printed cards if the conditions that the input card images do not meet the standard exist, so that the next detection is not performed, and the detection time is reduced; then the image segmentation module segments the card image into a plurality of areas, the areas are sent to different computers for synchronous detection according to the type of each area, and the computers synchronously detect and respectively complete detection of individual types, so that the detection time is reduced; the jet printing card standing horse which does not meet the standard is removed by the sorting device; and finally, the chip data comparison module detects the chip data of the jet printing card. The steps are orderly, the whole detection is firstly carried out, then the detection of the divided areas is carried out, and finally the chip data detection with the lowest error rate is carried out, so that the detection time is further shortened and the detection accuracy is improved.
According to a second aspect of the invention, the initialization module is configured to:
identifying and cutting out an image area of the jet printing card from the input card image;
rotating the image area of the jet printing card to enable the image area to be in the same direction as the image area of the print data;
the image area of the inkjet printed card is extended and overlaid with a background cloth.
According to a second aspect of the invention, the image segmentation module is configured to: and reading the coordinates of the printing area of the printing data image, and dividing the initialized card image according to the coordinates.
According to a second aspect of the present invention, a computer for detecting an image of which type is a human face is configured to:
constructing a first histogram of an image of which the type is a human face, and normalizing the first histogram;
constructing a second histogram of the face image in the print data image, and normalizing the second histogram;
and comparing the first histogram with the second histogram to obtain the similarity of the histograms.
According to a second aspect of the present invention, a computer for detecting an image of which the type is a photograph is configured to:
extracting a first image feature of an image of which the type is a photograph and a second image feature of a photograph image in the print data image;
correspondingly comparing the first image feature and the second image feature;
wherein the first image feature and the second image feature each comprise an edge and a pixel color of a photograph.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of a method for visually inspecting an inkjet printed card according to an embodiment of the present invention;
FIG. 2 is a detailed step diagram of step S200 in FIG. 1;
fig. 3 is a block diagram of a visual inspection system for inkjet printed cards in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, one embodiment of the present invention provides a visual inspection method for an inkjet printed card, including the following steps:
step S100, initializing an input card image;
step S200, judging whether the difference result of the initialized card image and the initialized printing data image meets the standard or not in a pixel point identification mode; if the card image is not matched with the image, the sorting device 40 rejects the spray printed card corresponding to the card image;
step S300, image segmentation is carried out on the initialized card image according to the printing area of the printing data image, and then the segmented image is sent to different computers 60 for synchronous detection according to the type of the segmented image; if the card image is not matched with the image, the sorting device 40 rejects the spray printed card corresponding to the card image; the types of the segmented images comprise one-dimensional codes, two-dimensional codes, human faces, photos and characters;
step S400, reading chip data of the jet printing card and comparing the chip data with source data; if the card is qualified, the spray printed card is judged to be qualified, and if the card is not qualified, the sorting device 40 rejects the spray printed card; the source data is original data which is stored in a database and input into the jet printing card chip.
In the embodiment, the input card image is initialized, namely pixel point identification is carried out to judge whether missing printing and offset phenomena exist in the whole card image, if the missing printing and offset phenomena do not meet the standard, the corresponding jet printing card is immediately removed, the next detection is not carried out, and the detection time is reduced; then, the card image is divided into a plurality of areas, the areas are sent to different computers 60 for synchronous detection according to the type of each area, the computers 60 perform synchronous detection and complete detection of individual types respectively, and detection time is reduced; the vertical mark of the jet printing card which does not meet the standard is removed; and finally, detecting the chip data of the jet printing card. The steps are orderly, the whole detection is firstly carried out, then the detection of the divided areas is carried out, and finally the chip data detection with the lowest error rate is carried out, so that the detection time is further shortened and the detection accuracy is improved.
The inkjet printed cards are transported on the transport belt 10 at intervals one after the other. Generally, the inkjet printed cards are arranged and transported on a specific position of the transport belt 10 after the inkjet printing is completed. The camera 20 is aligned with a specific position of the conveyor belt 10, and it should be noted that the shooting range of the lens is larger than that of the specific position, so as to avoid the situation that the position of the jet printing card is shifted and the jet printing card cannot be completely shot into the card image. The acquired card image is then subjected to an initialization process.
Specifically, step S100 includes the steps of:
step S110, identifying and cutting out an image area of the jet printing card from the input card image;
step S120, rotating the image area of the jet printing card to enable the image area to be in the same direction as the image of the print data;
and step S130, extending the image area of the jet printing card and paving the background cloth.
In step S100, since the base color of the inkjet printed card is white, the color of the transfer belt 10 is other colors having a high contrast with the base color of the inkjet printed card, which facilitates identification of the image area of the card in the card image. After rotation and flood, an initialized card image is obtained which completely floods the background cloth and only contains the jet printed cards. After initialization, detection in subsequent steps is facilitated.
Referring to fig. 2, further, in step S200, the initialized card image is preliminarily detected, that is, whether the difference result between the initialized card image and the print data image meets the standard is determined in a pixel point identification manner, which includes the following steps:
step S210, performing Gaussian blur and binarization processing on the initialized card image and the initialized print data image;
step S220, zooming the initialized card image to the resolution ratio same as that of the print data image; the initialized card image and the pixels of the original printing data image correspond one by one;
step S230, calculating the difference value between each pixel corresponding to the initialized card image and the print data image;
and step S240, judging whether the difference meets the standard or not according to the difference result.
In this step, since gaussian blurring and binarization processing are performed, if the printed pattern does not have the phenomena of offset, scratch, ink drop and black dot, the difference value is small and is almost zero. Therefore, the acceptable range for the difference should be [ -0.05,0.05 ]. Whether the jet printing cards have the phenomena of deviation, scratch, ink drop black spots and the like can be judged through the preliminary detection of the pixel point identification mode, and if the jet printing cards exist, a signal is sent to the sorting device 40 to reject the jet printing cards.
Further, in step S300, the image segmentation specifically includes: and reading the coordinates of the printing area of the printing data image, and dividing the initialized card image according to the coordinates.
In the original print data image, the type of image of each print area has been indicated, and the divided card images are distributed to the respective computers 60 responsible for inspection in synchronization with inspection.
Specifically, the image of which the type is a one-dimensional code is detected, and is solely responsible for one computer 60; and reading the information of the one-dimensional code and judging whether the information is correct or not.
In addition, the image of which type is a two-dimensional code is detected and is solely responsible for another computer 60. And preferentially reading the information of the two-dimensional code and judging whether the information is correct or not. And detecting the whole graph of the two-dimensional code to judge whether the whole graph is the same as the two-dimensional code part of the original printing data image.
In addition, the detection of the image of which the type is a human face comprises the following steps:
constructing a first histogram of an image of which the type is a human face, and normalizing the first histogram;
constructing a second histogram of the face image in the print data image, and normalizing the second histogram;
and comparing the first histogram with the second histogram to obtain the similarity of the histograms.
In addition, the specific steps of detecting the image of which the type is a photograph are as follows:
extracting a first image feature of an image of which the type is a photograph and a second image feature of a photograph image in the print data image;
correspondingly comparing the first image characteristic with the second image characteristic;
wherein the first image feature and the second image feature each comprise an edge and a pixel color of the photograph; texture features and shape features may of course also be included. Because the difference between the divided image and the photo part of the print data image is not large, only the edge of the photo needs to be detected, and whether the offset is further refined and detected; and detecting pixel color, and detecting whether color distortion occurs.
In addition, the image with the image type as the character is detected, the character form in the image is identified, the character type and the character represented by the character type are judged according to the character form, and then comparison is carried out.
In the step of detection after division, only the type of image included in the original print data image is detected. For example, if the print data image only contains a portrait and text, the image of only two parts is divided and then distributed to the two computers 60 to synchronously detect the image of the portrait part and the image of the text part.
Finally, step S400 is performed, and the chip data of the inkjet printed card is read by the card reader 30 and compared with the source data for detection. The jet printing card which meets the standard in all the three detection steps is a qualified product.
Referring to fig. 3, another embodiment of the present invention is a visual inspection system for an inkjet printed card, which is used for executing the above visual inspection method for an inkjet printed card, and includes:
a conveyor belt 10 for conveying inkjet printed cards;
the camera 20 is used for collecting card images of the jet printing cards;
a card reader 30 for reading chip data of the inkjet printed card;
the sorting device 40 is used for removing the jet printing cards which do not meet the standard;
a general processor 50, the general processor 50 comprising:
an initialization module 51 for initializing an input card image;
the pixel point identification module 52 is configured to determine whether a difference result between the initialized card image and the print data image meets a standard in a pixel point identification manner;
an image segmentation module 53, configured to perform image segmentation on the initialized card image according to a print area of the print data image, and distribute the segmented image according to the type of the segmented image; the types of the segmented images comprise one-dimensional codes, two-dimensional codes, human faces, photos and characters;
a chip data comparison module 54 for comparing the chip data of the inkjet printed card with the source data;
a result sending module 55, configured to send the detection result of the inkjet printed card to the sorting apparatus 40;
a plurality of computers 60 for synchronously detecting the segmented images;
the pixel point identification module 52 includes:
the preliminary processing unit is used for carrying out Gaussian blur and binarization processing on the initialized card image and the initialized print data image;
the zooming unit is used for zooming the initialized card image to the resolution ratio same as that of the printing data image;
the difference value calculating unit is used for calculating the difference value between each pixel corresponding to the initialized card image and the print data image;
and the judging unit is used for judging whether the standard is met or not according to the difference result.
In this embodiment, the pixel point identification module 52 performs initialization processing on the input card image, i.e., pixel point identification, to determine whether the card image has missing print and offset phenomena, and if the card image does not meet the standard, the sorting device 40 immediately rejects the corresponding jet-printed card without performing the next detection, thereby reducing the detection time; then the image segmentation module 53 segments the card image into a plurality of regions, and sends the regions to different computers 60 for synchronous detection according to the type of each region, and the computers 60 perform synchronous detection and complete detection of individual types respectively, thereby reducing detection time; the jet printing card standing horses which do not meet the standard are removed by the sorting device 40; finally, the chip data comparison module 54 performs chip data detection of the inkjet printed card. The steps are orderly, the whole detection is firstly carried out, then the detection of the divided areas is carried out, and finally the chip data detection with the lowest error rate is carried out, so that the detection time is further shortened and the detection accuracy is improved.
In another embodiment of the present invention, a storage medium is provided, which stores executable instructions that can be executed by a processor and cause the above-mentioned vision inspection system to operate according to the above-mentioned vision inspection method.
The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.
Claims (10)
1. A visual detection method of an inkjet printed card is characterized by comprising the following steps:
initializing the input card image;
judging whether the difference result of the initialized card image and the initialized printing data image meets the standard or not in a pixel point identification mode; if the card image is not matched with the printed card image, the spraying printed card corresponding to the card image is rejected by the sorting device;
carrying out image segmentation on the initialized card image according to the printing area of the printing data image, and then sending the segmented image to different computers for synchronous detection according to the type of the segmented image; if the card image is not matched with the printed card image, the spraying printed card corresponding to the card image is rejected by the sorting device; the types of the segmented images comprise one-dimensional codes, two-dimensional codes, human faces, photos and characters;
reading chip data of the jet printing card and comparing the chip data with source data; if the card is not qualified, the sorting device rejects the jet printing card;
the method for judging whether the difference result of the initialized card image and the initialized print data image meets the standard or not through the pixel point identification mode comprises the following steps:
performing Gaussian blur and binarization processing on the initialized card image and the initialized print data image;
scaling the initialized card image to the same resolution as the print data image;
calculating the difference value between each pixel corresponding to the initialized card image and the print data image;
and judging whether the difference meets the standard or not according to the difference result.
2. The visual inspection method of an inkjet printed card according to claim 1, wherein the initialization process for the input card image comprises the steps of:
identifying and cutting out an image area of the jet printing card from the input card image;
rotating the image area of the jet printing card to enable the image area to be in the same direction as the image area of the print data;
the image area of the inkjet printed card is extended and overlaid with a background cloth.
3. The visual inspection method of inkjet printed cards according to claim 1, wherein the image segmentation is specifically: and reading the coordinates of the printing area of the printing data image, and dividing the initialized card image according to the coordinates.
4. The visual inspection method of the inkjet printed card according to claim 1, wherein the step of detecting the image whose image type is a human face comprises the steps of:
constructing a first histogram of an image of which the type is a human face, and normalizing the first histogram;
constructing a second histogram of the face image in the print data image, and normalizing the second histogram;
and comparing the first histogram with the second histogram to obtain the similarity of the histograms.
5. The visual inspection method of inkjet printed cards according to claim 1, wherein the image inspection of the type of image as a photograph is specifically:
extracting a first image feature of an image of which the type is a photograph and a second image feature of a photograph image in the print data image;
correspondingly comparing the first image feature and the second image feature;
wherein the first image feature and the second image feature each comprise an edge and a pixel color of a photograph.
6. A visual inspection system for inkjet printed cards, comprising:
the conveying belt is used for conveying the jet printing cards;
the camera is used for collecting a card image of the jet printing card;
the card reader is used for reading chip data of the jet printing card;
the sorting device is used for removing the jet printing cards which do not meet the standard;
an overall processor, comprising:
the initialization module is used for initializing the input card image;
the pixel point identification module is used for judging whether the difference result of the initialized card image and the initialized print data image meets the standard or not in a pixel point identification mode;
the image segmentation module is used for carrying out image segmentation on the initialized card image according to the printing area of the printing data image and distributing the segmented image according to the type of the segmented image; the types of the segmented images comprise one-dimensional codes, two-dimensional codes, human faces, photos and characters;
the chip data comparison module is used for comparing the chip data of the jet printing card with the source data;
the result sending module is used for sending the detection result of the jet printing card to the sorting device;
a plurality of computers for synchronously detecting the segmented images;
wherein, the pixel point identification module comprises:
the preliminary processing unit is used for carrying out Gaussian blur and binarization processing on the initialized card image and the initialized print data image;
the zooming unit is used for zooming the initialized card image to the resolution ratio same as that of the printing data image;
the difference value calculating unit is used for calculating the difference value between each pixel corresponding to the initialized card image and the print data image;
and the judging unit is used for judging whether the standard is met or not according to the difference result.
7. The visual inspection system of an inkjet printed card of claim 6 wherein the initialization module is configured to:
identifying and cutting out an image area of the jet printing card from the input card image;
rotating the image area of the jet printing card to enable the image area to be in the same direction as the image area of the print data;
the image area of the inkjet printed card is extended and overlaid with a background cloth.
8. The visual inspection system of inkjet printed cards of claim 6 wherein the image segmentation module is configured to: and reading the coordinates of the printing area of the printing data image, and dividing the initialized card image according to the coordinates.
9. The visual inspection system of an inkjet printed card of claim 6 wherein the computer for detecting the image of the type of image as a human face is configured to construct a first histogram of the image of the type of image as a human face and normalize the first histogram;
constructing a second histogram of the face image in the print data image, and normalizing the second histogram;
and comparing the first histogram with the second histogram to obtain the similarity of the histograms.
10. The visual inspection system of inkjet printed cards of claim 6 wherein the computer for detecting the type of image is a photograph is configured to:
extracting a first image feature of an image of which the type is a photograph and a second image feature of a photograph image in the print data image;
correspondingly comparing the first image feature and the second image feature;
wherein the first image feature and the second image feature each comprise an edge and a pixel color of a photograph.
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|---|---|---|---|---|
| CN112150365A (en) * | 2020-10-15 | 2020-12-29 | 江西威力固智能设备有限公司 | Expansion and shrinkage processing method of jet printing image and jet printing equipment |
| CN112150365B (en) * | 2020-10-15 | 2023-02-21 | 江西威力固智能设备有限公司 | Expansion and shrinkage processing method of jet printing image and jet printing equipment |
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| CN110852994B (en) | 2023-03-28 |
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