CN103454283A - Line detection system and method - Google Patents

Abstract

The invention discloses a line detection system and method. The line detection system comprises an image acquisition system and a motion control system which is used for adjusting the position of a detected object and focusing the image acquisition system, wherein the motion control system comprises a z-axis stepping motor, a z-axis screw rod and a z-axis objective table; the z-axis screw rod is driven to rotate through the z-axis stepping motor; the z-axis objective table is connected with the z-axis screw rod; the z-axis objective table is used for bearing the image acquisition system; an x-axis screw rod is driven to rotate through an x-axis stepping motor; an x-axis objective table is connected with the x-axis screw rod and is used for bearing the object to be detected. According to the line detection system and method, the scheme of automatically detecting the appearance and characteristics of a ceramic substrate at a high speed and high precision can be achieved, the human cost of enterprises is saved, and the detection efficiency and precision are improved.

Description

Line detection system and method

technical field

The present invention relates to the technical field of detecting the shape and size of objects. According to an embodiment of the present invention, it specifically relates to a circuit detection system and method for ceramic substrates.

Background technique

Ceramic substrate materials occupy the most important position in electronic ceramics, especially insulators or packaging materials for highly integrated circuits. With the continuous development of the electronics industry, the processing accuracy and technology of ceramic substrates have greatly improved. However, at this stage, the detection of ceramic substrates is still dominated by manual detection. The shape and size of the substrates are detected by using tools such as micrometers and magnifying glasses, which seriously reduces the production speed. The main problems faced by the current detection methods are as follows:

1. The detection speed is slow. For each substrate, it must be detected manually using a micrometer or a magnifying glass. The speed of manual detection is quite low, and for circles or other graphics with high precision requirements and small apertures, it is impossible to use a micrometer to detect them.

2. There is no way to detect special graphics. For complex geometric figures printed on the substrate, it is not feasible to use a micrometer. If a magnifying glass with a scale is used, the detection speed will be slow and the accuracy will be low, because for the same substrate, different people will Tests may all yield different results.

3. Manual detection is inconvenient for statistical process control.

Contents of the invention

The present invention overcomes the deficiencies of the prior art, and provides a line detection system with low detection cost, high efficiency and high precision;

And the method for realizing the line detection system.

Considering the above-mentioned problems of the prior art, according to one aspect disclosed by the present invention, the present invention adopts the following technical solutions:

A line detection system, comprising:

An image acquisition system, used for imaging of the detected object and the acquired image;

The motion control system is used to adjust the position of the detected object and the focus of the image acquisition system; the motion control system includes:

z-axis stepper motor;

A z-axis screw rod, the z-axis screw rod is driven to rotate by a z-axis stepping motor;

A z-axis stage, the z-axis stage is connected to the z-axis screw, and the z-axis stage is used to carry the image acquisition system;

x-axis servo motor;

An x-axis screw rod, the x-axis screw rod is driven to rotate by an x-axis stepping motor;

An x-axis stage, the x-axis stage is connected to the x-axis screw, and the x-axis stage is used to carry the object to be detected.

In order to realize the present invention better, further technical scheme is:

According to one embodiment of the present invention, the image acquisition system includes:

The light source is used to illuminate the object to be detected, so that the outline and lines of the object to be detected are clear;

Optical lenses and cameras;

Image acquisition card for image acquisition.

According to one embodiment of the present invention, a focusing barrel is arranged between the optical lens and the camera.

According to one embodiment of the present invention, the image acquisition system also includes:

A receiving module, configured to receive camera frame data;

A jigsaw module for merging multiple target images collected into a complete picture;

The sending module is used to send images.

According to an embodiment of the present invention, also comprise image analysis system, this image analysis system comprises:

An image preprocessing module is used to analyze the collected images to determine whether the collected images are valid;

The threshold processing module performs dynamic threshold processing based on local histograms on local images; because the overall printing conditions of ceramic substrates are different, different thresholds need to be used for different positions to improve the accuracy of contour extraction;

Contour extraction module, is used for extracting image contour;

Contour matching module, used for registering the extracted image contour with the preset standard document;

The defect detection module is used to compare and analyze the extracted image outline with the registered standard document to obtain the defect of image parameters.

The present invention can also be:

A method for implementing the above-mentioned line detection system, comprising:

Drive the z-axis screw to rotate through the z-axis stepping motor;

The rotation of the z-axis screw drives the z-axis stage and the image acquisition system connected to the z-axis stage to move up and down;

Drive the x-axis screw to rotate through the x-axis stepping motor;

The rotation of the x-axis screw drives the x-axis stage and the detected object connected to the x-axis stage to move in the horizontal direction;

adjusting the position of the detected object and the focus of the image acquisition system through the respective movements of the z-axis stage and the x-axis stage;

After focusing, the detected object is imaged and collected by the image acquisition system.

According to one embodiment of the present invention, in the image acquisition system:

Use a light source to illuminate the detected object to make the outline and lines of the detected object clear; and

Image the detected object with optical lens and camera;

Image acquisition was performed with a frame grabber.

According to an embodiment of the present invention, the moving direction of the object to be detected is perpendicular to the shooting direction of the camera, and the moving speed of the object to be detected matches the acquisition line frequency of the camera.

According to one embodiment of the present invention, comprising:

Receive camera frame data;

Continue to receive camera frame data without receiving camera frame data;

After receiving the receiver frame data, end the collection and make a puzzle;

Send the collaged images.

According to one embodiment of the present invention, comprising:

Analyze the collected images to determine whether the collected images are valid;

Thresholding;

Extract image contours;

Register the extracted image outline with the preset standard document;

The extracted image contours are compared with the registered standard documents to find out the defects of the image parameters.

Compared with the prior art, one of the beneficial effects of the present invention is:

The line detection system and method thereof of the present invention can realize a high-speed and high-precision automatic detection function scheme for the shape and characteristics of the ceramic substrate, save the labor cost of the enterprise, and improve the detection efficiency and precision.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiment of the present application document or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiment or the prior art. Apparently, the accompanying drawings in the following description The drawings are only references to some embodiments in the present application documents, and those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a line detection system according to an embodiment of the present invention;

2 is a schematic top view of a line detection system according to an embodiment of the present invention;

3 is a block diagram of an implementation method of a line detection system according to an embodiment of the present invention;

Fig. 4 is a block diagram of an implementation method of a line detection system according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

As shown in FIG. 1, FIG. 1 is a schematic structural diagram of a line detection system according to an embodiment of the present invention. A line detection system includes an image acquisition system 10 and a motion control system 20; the image acquisition system 10 is used for detecting objects Imaging, and capturing the resulting image. The image acquisition system 10 includes a light source 11, an optical lens 12, a camera 13, and an image acquisition card (not shown in FIG. 1); the light source 11 is used to illuminate the detected object, so that the outline and lines of the detected object are clear; The optical lens 12 and the camera 13 are used for imaging; the image acquisition card is used for image acquisition. A focusing tube 14 can be arranged between the optical lens 12 and the camera 13, so as to facilitate focusing, that is, the optical lens 12 is connected with one end of the focusing tube 14, and the other end of the focusing tube 14 is connected with the camera 13, and the image acquisition card can be located at Camera 13 interior. The focusing cylinder 14 is vertically installed, and when the optical lens 12 and the camera 13 connected thereto are used to take pictures, it moves in the vertical direction and is perpendicular to the object to be detected; the light source 11 can be a combined light source, through the adjustment of the group and light source , to get the ideal image data. The camera 13 may be a line scan CCD camera.

The motion control system 20 is used to adjust the focus of the detected object position and the image acquisition system; the motion control system 20 includes:

z-axis stepping motor 21;

A z-axis screw rod 22, the z-axis screw rod 22 is driven to rotate by a z-axis stepping motor 21;

A z-axis stage 23, the z-axis stage 23 is connected to the z-axis screw 22, and the z-axis stage 23 is used to carry the image acquisition system 10;

The x-axis servo motor 24, as shown in Figure 2, is a schematic top view of a line detection system according to an embodiment of the present invention;

x-axis screw (not shown in the figure), the x-axis screw is driven by the x-axis stepping motor 24 to rotate;

Continue as shown in FIG. 1 , the x-axis stage 25 is connected with the x-axis screw, and the x-axis stage 25 is used to carry the detected object.

The image acquisition system 10 may also include:

A receiving module, configured to receive camera frame data;

A jigsaw module for merging multiple target images collected into a complete picture;

The sending module is used to send images.

Also connected with the image acquisition system 10 is an image analysis system, which includes:

An image preprocessing module is used to analyze the collected images to determine whether the collected images are valid;

The threshold processing module is used to perform dynamic threshold processing on the local image to improve the accuracy of contour extraction;

Contour extraction module, is used for extracting image contour;

Contour matching module, used for registering the extracted image contour with the preset standard document;

The defect detection module is used to compare and analyze the extracted image outline with the registered standard document to obtain the defect of image parameters.

A method for implementing a line detection system, comprising:

Drive the z-axis screw rod 22 to rotate through the z-axis stepping motor 21;

The rotation of the z-axis screw 22 drives the z-axis stage 23 and the image acquisition system 10 connected to the z-axis stage 23 to move up and down;

The x-axis screw rod is driven to rotate by the x-axis stepping motor 24;

The rotation of the x-axis screw drives the x-axis stage 25 and the detected object connected to the x-axis stage 25 to move in the horizontal direction;

Adjust the position of the detected object and the focus of the image acquisition system 10 through the respective movements of the z-axis stage 23 and the x-axis stage 25;

After focusing, the object to be detected is imaged and the image is collected by the image acquisition system 10 .

In the image acquisition system 10:

Lighting the detected object with light source 11 to make the outline and lines of the detected object clear; and

Imaging the detected object with optical lens 12 and camera 13;

Image acquisition was performed with a frame grabber.

The moving direction of the detected object is perpendicular to the shooting direction of the camera 13 , and the moving speed of the detected object matches the acquisition line frequency of the camera.

As shown in FIG. 3, FIG. 3 is a block diagram of an implementation method of a line detection system according to an embodiment of the present invention, and the implementation method of the line detection system includes:

Initialization of the acquisition system S31;

Trigger motion acquisition system S32;

Receive camera frame data S33;

If the camera frame data is not received, return to receive camera frame data S33;

After receiving the receiver frame data, end the collection and perform puzzle S34;

Sending the collaged image S35.

As shown in FIG. 4, FIG. 4 is a block diagram of an implementation method of a line detection system according to an embodiment of the present invention, including:

Image analysis system initialization S41;

Wait for the image acquisition to complete S42;

The collected image is analyzed to determine whether the collected image is valid, and if the image is invalid, return to S42, and if the image is valid, enter the next step;

Threshold processing S43;

Extract image contour S44;

Registering the extracted image outline with a preset standard document S45;

Perform comparative analysis on the extracted image profile and the registered standard document to obtain the defect S46 of the image parameter.

To sum up, the motion control system 20 is mainly used to move the ceramic substrate to the field of view of the camera 13 for imaging and control the camera 13 to focus. The equipment can include the following parts: motion control card, servo driver, servo motor and high-precision screw. In order to ensure that the imaging of the ceramic substrate is not deformed, it is necessary to ensure that the motion direction of the ceramic substrate is perpendicular to the CCD of the line scan camera, and the motion speed matches the acquisition line frequency of the line scan camera. Therefore, a servo motor and driver with high motion accuracy can be used. And use a screw with a relatively small pitch and high precision to improve the precision of motion control. The motion control system 20 moves the substrate to the field of view of the camera 13 through a stage, and the stage is driven by a screw connected to a servo motor to ensure the precision of the movement of the substrate.

The image acquisition system 10 is mainly used for imaging the ceramic substrate, making the outline of the ceramic substrate and the edge of the circuit of the substrate clear by lighting, and transmitting the image data to the image analysis system. The device mainly includes a group and a light source, an optical lens 12, a ccd line scan camera, and an image acquisition card. The combined light source is used to illuminate the substrate brought by the motion system to make the outline and lines of the substrate clear. The camera images the ceramic substrate and transmits the image data to the image acquisition card through the CAMLINK line. In order to ensure that the camera image is not deformed, the fixing device of the camera 13 needs to be able to move the focus up and down, rotate the CCD left and right on the horizontal plane to ensure that the direction of motion is perpendicular to the CCD, and rotate the CCD around the direction of motion to ensure that the distance between each photosensitive element of the CCD and the ceramic substrate is equal. Rotate around the vertical line of the moving direction, change the field of view position of the camera 13, cooperate with the adjustment of the group and the light source, and obtain the most ideal image data.

The image analysis system is mainly used to process and analyze the image data collected by the imaging system, and to register and compare according to the standard documents set by the user in advance, to obtain various parameters and defects on the ceramic substrate that need to be detected, and to The test results are counted, analyzed and stored, and the statistical process analysis can also be carried out according to the historical storage information, so as to facilitate the manufacturer to analyze and adjust the production line, so that the entire production line can be optimized.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

References in this specification to "one embodiment", "another embodiment", "embodiment", etc. refer to the specific features, structures or characteristics described in conjunction with the embodiment included in the general description of this application. In at least one embodiment of . The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure or characteristic is described in combination with any embodiment, it is claimed that implementing such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it is to be understood that numerous other modifications and implementations can be devised by those skilled in the art which will fall within the scope of the disclosure disclosed in this application. within the scope and spirit of the principles. More specifically, within the scope of the disclosure, drawings and claims of the present application, various modifications and improvements can be made to the components and/or layout of the subject combination layout. In addition to modifications and improvements in component parts and/or layout, other uses will be apparent to those skilled in the art.

Claims (10)

1. A line detection system, characterized in that, comprising: An image acquisition system, used for imaging of the detected object and the acquired image; The motion control system is used to adjust the position of the detected object and the focus of the image acquisition system; the motion control system includes: z-axis stepper motor; A z-axis screw rod, the z-axis screw rod is driven to rotate by a z-axis stepping motor; A z-axis stage, the z-axis stage is connected to the z-axis screw, and the z-axis stage is used to carry the image acquisition system; x-axis servo motor; An x-axis screw rod, the x-axis screw rod is driven to rotate by an x-axis stepping motor; An x-axis stage, the x-axis stage is connected to the x-axis screw, and the x-axis stage is used to carry the object to be detected. 2. The line detection system according to claim 1, wherein the image acquisition system comprises: The light source is used to illuminate the object to be detected, so that the outline and lines of the object to be detected are clear; Optical lenses and cameras; Image acquisition card for image acquisition. 3. The line inspection system according to claim 2, characterized in that a focusing tube is arranged between the optical lens and the camera. 4. The line detection system according to claim 1, wherein the image acquisition system further comprises: A receiving module, configured to receive camera frame data; A jigsaw module for merging multiple target images collected into a complete picture; The sending module is used to send images. 5. The line detection system according to claim 1, further comprising an image analysis system, the image analysis system comprising: An image preprocessing module is used to analyze the collected images to determine whether the collected images are valid; Threshold processing module, for performing dynamic threshold processing on local images; Contour extraction module, is used for extracting image contour; Contour matching module, used for registering the extracted image contour with the preset standard document; The defect detection module is used for comparing and analyzing the extracted image outline with the registered standard document to obtain the defect of image parameters. 6. A method for realizing the line detection system as claimed in claim 1, characterized in that, comprising: Drive the z-axis screw to rotate through the z-axis stepping motor; The rotation of the z-axis screw drives the z-axis stage and the image acquisition system connected to the z-axis stage to move up and down; Drive the x-axis screw to rotate through the x-axis stepping motor; The rotation of the x-axis screw drives the x-axis stage and the detected object connected to the x-axis stage to move in the horizontal direction; adjusting the position of the detected object and the focus of the image acquisition system through the respective movements of the z-axis stage and the x-axis stage; After focusing, the detected object is imaged and collected by the image acquisition system. 7. The method of the line detection system according to claim 6, characterized in that, in the image acquisition system: Use a light source to illuminate the detected object to make the outline and lines of the detected object clear; and Image the detected object with optical lens and camera; Image acquisition is performed with a frame grabber. 8 . The method of the line detection system according to claim 7 , wherein the moving direction of the detected object is perpendicular to the shooting direction of the camera, and the moving speed of the detected object matches the acquisition line frequency of the camera. 9. The method of the line detection system according to claim 6, characterized in that, comprising: Receive camera frame data; Continue to receive camera frame data without receiving camera frame data; After receiving the receiver frame data, end the collection and make a puzzle; Send the collaged images. 10. The method of the line detection system according to claim 6, characterized in that, comprising: Analyze the collected images to determine whether the collected images are valid; Thresholding; Extract image contours; Register the extracted image outline with the preset standard document; The extracted image contours are compared with the registered standard documents to find out the defects of the image parameters.

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