CN110876055B - External triggering linear camera detection system and image uniformity processing method thereof - Google Patents
External triggering linear camera detection system and image uniformity processing method thereof Download PDFInfo
- Publication number
- CN110876055B CN110876055B CN201811003796.0A CN201811003796A CN110876055B CN 110876055 B CN110876055 B CN 110876055B CN 201811003796 A CN201811003796 A CN 201811003796A CN 110876055 B CN110876055 B CN 110876055B
- Authority
- CN
- China
- Prior art keywords
- image
- control signal
- camera
- pixel data
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
Abstract
The invention discloses an external triggering linear camera detection system, which comprises a conveying device, a control unit, a linear camera with an image sensor and an image processor and a light source unit. The conveying device comprises a motor and a conveying belt. The motor has an encoder that provides a position signal based on the position of the rotating shaft. The conveyer belt is driven by a motor to convey the object to be detected. The control unit receives the position signal and provides a camera control signal according to the position signal. The linear camera receives the camera control signal and provides the triggering time of the camera control signal for each image. The image sensor generates pixel data of each image and transmits the pixel data to the image processor. The image processor compensates the brightness value of the pixel data of each image according to the ratio of the reference triggering time length to the triggering time length of the camera control signal.
Description
Technical Field
The present invention relates to a camera inspection system and an image processing method thereof, and more particularly, to an externally triggered linear camera inspection system and an image uniformity processing method thereof.
Background
Automatic Optical Inspection (AOI) is a high-speed and high-precision optical image inspection system that uses machine vision as an inspection standard technique to improve the defects of conventional inspection using optical instruments by manpower.
Generally, after the object to be tested (e.g. semiconductor chip) is manufactured, an inspection process is performed to inspect the appearance of the object to be tested by using an automatic optical inspection apparatus, and to screen and remove the object with obvious defects. Specifically, the automatic optical inspection is performed by the operation of the optical inspection machine, during the inspection process, the object to be inspected is irradiated by light, and then the defect is determined by capturing the image of the object to be inspected after irradiation by the image sensor unit.
In the past, automatic optical inspection has mostly used area-scan (area-scan) cameras to capture images of objects. The surface scanning photographic device mainly comprises a lens and a camera, wherein the object to be detected is brought into the visual field range of the lens for shooting. However, the image resolution of the area scan camera is limited by the resolution of the lens and the camera, so the image resolution is worse when the field of view is larger, and the image capturing speed is slow, which makes it difficult to meet the industrial requirements.
Line-scan (line-scan) has preferred features and advantages over area-scan, including: 1. in the aspect of light source control, the line scanning is easier to control than the surface scanning; 2. the line scanning can be continuous scanning, so that the image has continuity; 3. the line scanning is beneficial to scanning of the object to be measured which moves at high speed or has large width; 4. for high resolution image processing applications, the cost of line scan cameras is low; 5. the image captured by the line scanning camera has a better dynamic image capturing range.
For a shutterless linear camera with a light source that is constantly on in the external trigger mode, the image sensor scan trigger signal of the linear camera is generated by an encoder disposed on the rotating shaft of the motor. However, due to the different forces applied to the scanning platform, the acceleration and deceleration operations of the scanning platform cause unstable rotation of the motor, which results in non-uniform exposure time for each image and non-uniform brightness of the image in the horizontal direction.
Please refer to fig. 1, which is a schematic diagram illustrating the speed variation of a motor in the prior art. FIG. 1 shows that the exposure time varies due to the unstable rotation of the motor under 65 scanning images. For example, when the relative rotation speed of the motor is faster (negative compared to the reference rotation speed), the horizontal movement speed of the scanning platform is increased, so that the exposure time becomes relatively shorter, and a relatively dark image is generated; on the contrary, when the relative rotation speed of the motor is relatively slow (positive compared to the reference rotation speed), the horizontal movement speed of the scanning platform is reduced, so that the exposure time becomes relatively long, and a relatively bright image is generated. Therefore, the generated horizontal image shows the condition of uneven darkness and brightness, thereby increasing the misjudgment of the detection of the object to be detected.
In addition, not all types of AOI light sources can adjust the uniformity of the horizontal image by controlling the exposure time. Therefore, how to design an externally triggered linear camera detection system and an image uniformity processing method thereof, which achieve the processing of horizontal image uniformity by compensating image pixels, is a major subject that the inventors of the present invention intend to overcome and solve.
Disclosure of Invention
An objective of the present invention is to provide an externally triggered linear camera detection system, which solves the problem of non-uniform brightness of the horizontal image generated due to the unstable rotation of the motor.
To achieve the aforementioned objective, the present invention provides an externally triggered linear camera inspection system, which includes a conveying device, a control unit, a linear camera, and a light source unit. The conveying device comprises a motor and a conveying belt. The motor is provided with an encoder which is connected to a rotating shaft of the motor; wherein the encoder provides a position signal dependent on the position of the rotating shaft. The conveyer belt is driven by a motor to convey the object to be detected. The control unit receives the position signal and provides a camera control signal according to the position signal. The linear camera receives the camera control signal and provides the triggering time of the camera control signal for each image. The linear camera includes an image sensor and an image processor. The image sensor provides exposure and image taking time for the object to be detected according to the camera control signal. The image processor is connected with the image sensor. The light source unit provides enough light source for the object to be detected. The image sensor generates pixel data of each image and transmits the pixel data to the image processor. The image processor compensates the brightness value of the pixel data of each image according to the ratio of the reference triggering time length to the triggering time length of the camera control signal.
In one embodiment, the luminance value of the pixel data of the compensated image is equal to the product of the luminance value of the pixel data of the image before compensation and the ratio value.
In one embodiment, the triggering time duration of the camera control signal is set according to the rotation speed of the motor corresponding to the position signal.
In an embodiment, the reference triggering time duration is set according to a reference rotation speed of the motor, and the reference rotation speed is a rotation speed at which the brightness value of the pixel data of each image operated by the motor is a target brightness value.
In one embodiment, the control unit is any one of a field programmable gate array unit, a digital signal processor, an application specific integrated circuit, a microcontroller, and a programmable system on a chip.
In one embodiment, the control unit is disposed in an industrial computer.
In one embodiment, when the level of the camera control signal is changed and then changed within the active time, the camera control signal is an invalid control signal.
In one embodiment, the image sensor is any one of a CCD image sensor, a CMOS image sensor, and a contact image sensor.
By the aid of the externally triggered linear camera detection system, the brightness of images captured by the linear camera in the horizontal direction is uniform, and the detection accuracy of the object to be detected is improved.
Another objective of the present invention is to provide an image uniformity processing method for an externally triggered linear camera detection system, which solves the problem of non-uniform brightness of the horizontal image generated due to unstable rotation of the motor.
To achieve the above objects, the present invention provides an image uniformity processing method for an externally triggered linear camera inspection system, the externally triggered linear camera inspection system comprising a control unit, a linear camera having an image sensor and an image processor, and a light source unit, the image uniformity processing method comprising: (a) the control unit provides a camera control signal to the linear camera, and the linear camera provides trigger time of the camera control signal for each image; (b) the image sensor of the linear camera receives the camera control signal and provides exposure and image taking time for the object to be detected according to the camera control signal; and (c) the image sensor generates pixel data of each image and transmits the pixel data to the image processor of the linear camera; the image processor compensates the brightness value of the pixel data of each image according to the ratio of the reference triggering time length to the triggering time length of the camera control signal.
In one embodiment, step (c) comprises: and multiplying the brightness value of the pixel data of the image before compensation by the proportional value to obtain the brightness value of the pixel data of the image after compensation.
In one embodiment, the externally triggered linear camera detection system further comprises a motor and an encoder connected to a rotating shaft of the motor, the encoder providing a position signal according to a position of the rotating shaft; the triggering time length of the camera control signal is set according to the rotating speed of the motor corresponding to the position signal.
In an embodiment, the reference triggering time duration is set according to a reference rotation speed of the motor, and the reference rotation speed is a rotation speed at which the brightness value of the pixel data of each image operated by the motor is a target brightness value.
In one embodiment, step (a) comprises: when the level of the camera control signal is changed and then the level is changed again in the effective time, the camera control signal is an invalid control signal.
In one embodiment, the control unit is any one of a field programmable gate array unit, a digital signal processor, an application specific integrated circuit, a microcontroller, and a programmable system on a chip.
By the image uniformity processing method of the externally triggered linear camera detection system, the brightness of the horizontal images captured by the linear camera is uniform, and the detection accuracy of the object to be detected is improved.
For a further understanding of the technology, means, and efficacy of the invention to be achieved, reference should be made to the following detailed description of the invention and accompanying drawings which are believed to be a further and specific understanding of the invention, and to the following drawings which are provided for purposes of illustration and description and are not intended to be limiting.
Drawings
FIG. 1: a schematic of the speed variation of a prior art motor.
FIG. 2: is a schematic diagram of a first embodiment of the externally triggered linear camera detection system of the present invention.
FIG. 3: is a schematic diagram of a second embodiment of the externally triggered linear camera detection system of the present invention.
FIG. 4: is a control waveform diagram of the camera control signal of the present invention.
FIG. 5: the invention is a flow chart of an image uniformity processing method of an externally triggered linear camera detection system.
FIG. 6: the present invention is a schematic diagram of luminance value compensation of image pixel data.
Wherein, the reference numbers:
10 conveying device 11 motor
12 conveyor belt 13 roller
111 encoder 112 rotation shaft
20 control unit 30 linear camera
31 image sensor 32 image processor
40 light source unit 100 object to be detected
Sp position signal Sc1 Camera control Signal
TN,TN+1,TN+2Triggering time S10-S30 steps
Detailed Description
The technical contents and the detailed description of the present invention are described below with reference to the drawings.
Please refer to fig. 2, which is a schematic diagram of a linear camera detection system with external trigger according to a first embodiment of the present invention. The externally triggered linear camera detection system includes a conveyor 10, a control unit 20, a linear camera 30, and a light source unit 40. The conveyor 10 mainly includes a motor 11, a conveyor belt 12, and rollers 13. The motor 11 may be, but is not limited to, a stepping motor, a servo motor …, and the like. The motor 11 has an encoder 111, and the encoder 111 is attached to a rotating shaft 112 of the motor 11. The encoder 111 may be, but not limited to, an absolute encoder, an incremental encoder …, and the like, and is used to output the position of the rotating shaft 112 to determine the rotation angle of the rotating shaft 112. Accordingly, the encoder 111 provides the position signal Sp according to the position of the rotating shaft 112. The conveyor belt 12 is driven by the motor 11 to move in a specific direction and is supported by a plurality of rollers 13 to convey the object 100 to be detected in the specific direction.
The control unit 20 receives the position signal Sp and provides a camera control signal Sc1 according to the position signal Sp. The control unit 20 may be a processor or an integrated circuit having an arithmetic processing function, such as a Field Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Microcontroller (MCU), a programmable system on chip (SoC) …, but not limited thereto. Furthermore, the processors or integrated circuits can be installed in industrial computers (IPCs) as personal computers for exclusive industrial control. After receiving the position signal Sp, the control unit 20 can obtain the instantaneous position of the rotating shaft 112, that is, the rotation speed of the motor 11, such as the speed and acceleration information. Therefore, the control unit 20 provides the camera control signal Sc1 according to the position signal Sp, i.e., according to the condition that the rotation speed of the motor 11 is fast or slow.
The camera control signal Sc1 is a trigger signal for a plurality of images, and therefore the camera control signal Sc1 is a signal with continuous level changes, wherein each level change represents a trigger signal for each image. Fig. 4 is a schematic diagram of control waveforms of the camera control signal according to the present invention. As mentioned above, since the triggering time of the multiple images of the camera control signal Sc1 depends on the speed of the motor 11, the triggering time T of each image of the camera control signal Sc1 shown in fig. 4 is differentN、TN+1、TN+2… vary in length of time. Where N represents the nth image, N +1 represents the N +1 th image, N +2 represents the N +2 th image …, and so on. If the camera control signal Sc1 is directly provided to the image sensor 31 of the linear camera 30 for exposure and image capturing, the exposure time will be different (due to the influence of the rotation speed of the motor 11), and the horizontal image will be dark and bright unevenly.
In addition, when the level of the camera control signal Sc1 changes, for example, from high level to low level, and the level changes again within the active time, for example, within a relatively short time, that is, after the level of the camera control signal Sc1 changes from high level to low level, the level changes from low level to high level again within a very short time, or the level changes continuously between high level and low level, in this case, the system considers such a camera control signal Sc1 as noise that is interfered, and therefore filters the noise, and the noise is an invalid control signal. In other words, the trigger time T of the camera control signal Sc1N、TN+1、TN+2When the time length of (c) is abnormally short, for example, less than one fifth or one tenth, the camera control signal Sc1 is regarded as noise, and therefore the camera control signal Sc1 is not considered as a valid control signal. Until the next camera control signal Sc1 with the correct trigger time duration, the camera control signal Sc1 is provided to provide exposure time for the subsequent image.
After the camera control signal Sc1 is directly provided to the image sensor 31 of the linear camera 30 for exposure and image capture, the luminance value of the pixel data of each image is compensated, so that the luminance value of the pixel data of each image is not affected by the speed of the motor 11, and the target luminance value can be reached.
The light source unit 40 provides a sufficient light source to the object 100 to be detected. The trigger time T of each image due to the camera control signal Sc1N、TN+1、TN+2The length is different (due to the influence of the rotation speed of the motor 11), so the exposure time for exposing and capturing each image provided by the image sensor 31 of the linear camera 30 to the object 100 is different, and the brightness of the horizontal image captured by the linear camera 30 through the image sensor 31 is not uniform, so the accuracy of detecting the object 100 is reduced. The image sensor 31 may be any one of a Charge Coupled Device (CCD) image sensor, a Complementary Metal Oxide Semiconductor (CMOS) image sensor, and a Contact Image Sensor (CIS), but not limited thereto.
Fig. 3 is a schematic diagram of an externally triggered linear camera detection system according to a second embodiment of the present invention. The main difference between the second embodiment shown in fig. 3 and the first embodiment shown in fig. 2 lies in the number of light source units 40, which (fig. 2) uses two light source units 40 respectively disposed at two sides of the normal direction of the image sensor 31 for receiving the image; the former (fig. 3) uses a light source unit 40 disposed at one side of the normal direction of the image sensor 31 receiving the image, thereby achieving different lighting effects. Since the operation of the linear camera detection system shown in fig. 3 is the same as that of the linear camera detection system shown in fig. 2, reference may be made to the corresponding description, and the description thereof is omitted.
In addition, the light source unit 40 may also be disposed at the other side of the linear camera 30 relative to the conveyor belt 12 in a back-light projection manner, so that the light source unit 40 projects light to the object 100 to be detected, and the image sensor 31 captures the detection image of the object 100 to be detected.
Please refer to fig. 5, which is a flowchart illustrating an image uniformity processing method of the externally triggered linear camera inspection system according to the present invention. The externally triggered linear camera detection system comprises a control unit, a linear camera with an image sensor and an image processor, and a light source unit. Since the detailed description of the externally triggered linear camera detection system is described above, it is not repeated herein. The image uniformity processing method comprises the following steps: first, the control unit provides a camera control signal to the linear camera, and the linear camera provides a trigger time of the camera control signal for each image (S10). Wherein the control unit provides the camera control signal according to the position signal, i.e. according to the condition of the speed of rotation of the motor. Then, the image sensor of the linear camera receives the camera control signal, and provides the exposure time for the image of the object to be detected according to the camera control signal (S20). Because the exposure time lengths of each image of the camera control signals are different, the exposure time for providing each image for the object to be detected by the light source unit is different, so that the brightness of the image in the horizontal direction captured by the linear camera is uneven, and the detection accuracy of the object to be detected is reduced. Based on the above, the image sensor generates pixel data of each image and transmits the pixel data to the image processor of the linear camera; the image processor compensates the brightness value of the pixel data of each image according to the ratio of the reference trigger time length to the trigger time length of the camera control signal (S30). The brightness of the horizontal images is made uniform by compensating the brightness value of the pixel data of each image (instead of adjusting the exposure time), so that the detection accuracy of the object to be detected is improved.
Please refer to fig. 6, which is a diagram illustrating luminance value compensation of image pixel data according to the present invention. The rotation speed when the brightness value of the pixel data of each image is the target brightness value is defined as the reference rotation speed of the motor, so the reference trigger time length is set according to the reference rotation speed of the motor. That is, if the motor is operating at the reference rotation speed, the brightness value of the pixel data of each image obtained by exposure and image capturing with the reference trigger time length is the correct target brightness value. However, since the rotation speed of the motor is not constant, if the actual rotation speed of the motor deviates from the reference rotation speed, the trigger time length of the camera control signal also deviates from the reference trigger time length accordingly.
For clarity, the following description will be made by taking data as an example. The corresponding reference trigger time duration (Ts) is assumed to be 100% at the reference rotation speed. If the motor actually operates at the reference rotation speed, the trigger time length (Tm) of the corresponding camera control signal is also 100%. Therefore, since the ratio of the reference trigger time length (Ts) to the trigger time length (Tm) of the camera control signal is 1 by division, that is, Ts/Tm is 1, the luminance value (Pin) of the image pixel data before compensation is multiplied by the ratio, and the luminance value (Pout) of the image pixel data after compensation is obtained. Since the ratio is 1, the brightness value (Pout) of the compensated image pixel data is equal to the brightness value (Pin) of the image pixel data before compensation, in other words, since the motor is actually operated at the reference rotation speed, the brightness value of the pixel data of each image obtained by exposure is the target brightness value, and the effect equivalent to no need of brightness value compensation is obtained.
If the motor actually operates at 125% of the reference rotation speed (i.e., the motor actually operates faster), the trigger time period (Tm) of the camera control signal is shortened to 80%. Therefore, since the ratio of the reference trigger time length (Ts) to the trigger time length (Tm) of the camera control signal is 1.25 by division, that is, Ts/Tm is 1.25, the luminance value (Pin) of the image pixel data before compensation is multiplied by the ratio, and the luminance value (Pout) of the obtained compensated image pixel data is 1.25 times the luminance value (Pin) of the image pixel data before compensation. In other words, since the actual operation of the motor is faster and the exposure and image-taking time is shorter, the brightness value of the image pixel data is compensated by 1.25 times (brightened), so as to achieve the target brightness value equivalent to the pixel data of each image obtained by exposure and image-taking when the motor is operated at the reference rotation speed.
On the contrary, if the motor actually operates at 80% of the reference rotation speed (i.e., the motor actually operates slowly), the trigger time period (Tm) of the camera control signal increases to 125%. Therefore, since the ratio of the reference trigger time length (Ts) to the trigger time length (Tm) of the camera control signal is 0.8 by division, that is, Ts/Tm is 0.8, the luminance value (Pout) of the image pixel data after compensation obtained by multiplying the luminance value (Pin) of the image pixel data before compensation by the ratio is 0.8 times the luminance value (Pin) of the image pixel data before compensation. In other words, since the actual operation of the motor is slow and the exposure and image-taking time is long, the brightness value of the image pixel data is compensated by 0.8 times (darkened) to achieve the target brightness value equivalent to the pixel data of each image obtained by exposure and image-taking when the motor is operated at the reference rotation speed.
In addition, since the luminance value of the pixel data is calculated in a binary manner and is related to the bit number, taking an 8-bit (bit) pixel as an example, the luminance order (level) is 28The maximum brightness value of the pixel is 256, i.e., 256 steps. Therefore, to avoid the error compensation caused by the excessive maximum brightness of the pixel due to the arithmetic overflow (overflow) of the compensation brightness value, the product of the correction ratio values is introduced, i.e. the product is compensatedThe brightness value (Pout) of the image pixel data is multiplied by the correction ratio value. That is, when the brightness value (Pout) of the compensated image pixel data does not exceed the maximum brightness value of the pixel, the correction ratio is 1; when the brightness value (Pout) of the compensated image pixel data exceeds the maximum brightness value of the pixel, the correction ratio value is a value less than 1, so that the brightness value (Pout) of the compensated image pixel data is maintained within the maximum brightness value of the pixel.
In addition, for the error caused by the arithmetic overflow of the operation of compensating the brightness value, the brightness value (Pout) of the compensated image pixel data can be clamped at the order of the maximum brightness value of the pixel, so that the brightness value (Pout) of the compensated image pixel data can be maintained at the maximum brightness value of the pixel even if the arithmetic overflow of the operation of compensating the brightness value occurs.
In summary, the present invention has the following features and advantages:
1. according to the ratio of the reference triggering time length to the triggering time length of the camera control signal, the brightness value of the pixel data of each image is compensated, so that the brightness of the horizontal images captured by the linear camera is uniform, and the detection accuracy of the object to be detected is improved.
2. The camera control signal with the extremely short triggering time length is filtered, so that the compensation of the brightness value of the pixel data is prevented from being influenced by noise to cause wrong calculation of compensation quantity.
3. And introducing the product of the correction ratio values to maintain the brightness value of the compensated image pixel data within the maximum brightness value of the pixel, or clamping the brightness value of the compensated image pixel data at the order of the maximum brightness value of the pixel, so as to maintain the brightness value of the compensated image pixel data at the maximum brightness value of the pixel.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (14)
1. An externally triggered linear camera detection system is characterized by comprising a conveying device, a control unit, a linear camera and a light source unit;
the conveying device comprises a motor and a conveying belt;
the motor is provided with an encoder which is connected to a rotating shaft of the motor; wherein the encoder provides a position signal according to the position of the rotating shaft; and
the conveyer belt is driven by the motor to convey an object to be detected;
the control unit receives the position signal and provides a camera control signal according to the position signal;
the linear camera receives the camera control signal and provides the triggering time of the camera control signal for each image, wherein the linear camera comprises an image sensor and an image processor;
the image sensor provides exposure and image capturing time for the object to be detected according to the camera control signal; and
the image processor is connected with the image sensor; and
the light source unit provides enough light source for the object to be detected;
wherein, the image sensor generates pixel data of each image and transmits the pixel data to the image processor; the image processor compensates the brightness value of the pixel data of each image according to a ratio of a reference triggering time length and the triggering time length of the camera control signal.
2. The system of claim 1, wherein the luminance value of the pixel data of the compensated image is equal to the product of the luminance value of the pixel data of the pre-compensated image and the ratio.
3. The system of claim 1, wherein the trigger time period of the camera control signal is set according to the rotation speed of the motor corresponding to the position signal.
4. The system as claimed in claim 3, wherein the reference triggering time duration is set according to a reference rotation speed of the motor, and the reference rotation speed is a rotation speed at which the brightness value of the pixel data of each image is the target brightness when the motor is in steady operation.
5. The externally triggered linear camera inspection system of claim 1, wherein the control unit is any one of a field programmable gate array unit, a digital signal processor, a microcontroller, a programmable system on a chip.
6. The system of claim 5, wherein the control unit is disposed in an industrial computer.
7. The system as claimed in claim 1, wherein the camera control signal is an invalid control signal when the level of the camera control signal is changed again within an active time after the level of the camera control signal is changed.
8. The system of claim 1, wherein the image sensor is any one of a CCD image sensor, a CMOS image sensor, and a contact image sensor.
9. An image uniformity processing method of an externally triggered linear camera inspection system, the externally triggered linear camera inspection system comprising a control unit, a linear camera having an image sensor and an image processor, and a light source unit, the image uniformity processing method comprising:
(a) the control unit provides a camera control signal to the linear camera, and the linear camera provides the triggering time of the camera control signal for each image;
(b) the image sensor of the linear camera receives the camera control signal and provides exposure and image capturing time for an object to be detected according to the camera control signal; and
(c) the image sensor generates pixel data of each image and transmits the pixel data to the image processor of the linear camera; the image processor compensates the brightness value of the pixel data of each image according to a ratio of a reference trigger time length to the trigger time length of the camera control signal.
10. The method of claim 9, wherein the step (c) comprises:
the brightness value of the pixel data of the image before compensation is multiplied by the proportion value to obtain the brightness value of the pixel data of the image after compensation.
11. The method of claim 9, wherein the externally triggered linear camera inspection system further comprises a motor and an encoder coupled to a rotating shaft of the motor, the encoder providing a position signal according to a position of the rotating shaft; wherein the triggering time length of the camera control signal is set according to the rotating speed of the motor corresponding to the position signal.
12. The method as claimed in claim 11, wherein the reference triggering time duration is set according to a reference rotation speed of the motor, and the reference rotation speed is a rotation speed at which the brightness value of the pixel data of each image is the target brightness value when the motor is in a steady operation.
13. The method of claim 9, wherein the step (a) comprises:
when the level of the camera control signal is changed and then is changed within an effective time, the camera control signal is an invalid control signal.
14. The method as claimed in claim 9, wherein the control unit is any one of a field programmable gate array unit, a digital signal processor, a microcontroller, and a programmable system on a chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811003796.0A CN110876055B (en) | 2018-08-30 | 2018-08-30 | External triggering linear camera detection system and image uniformity processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811003796.0A CN110876055B (en) | 2018-08-30 | 2018-08-30 | External triggering linear camera detection system and image uniformity processing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110876055A CN110876055A (en) | 2020-03-10 |
| CN110876055B true CN110876055B (en) | 2021-04-09 |
Family
ID=69715540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811003796.0A Active CN110876055B (en) | 2018-08-30 | 2018-08-30 | External triggering linear camera detection system and image uniformity processing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110876055B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005124317A2 (en) * | 2004-06-09 | 2005-12-29 | Cognex Technology And Investment Corporation | Method and apparatus for visual detection and inspection of objects |
| JP2008102818A (en) * | 2006-10-20 | 2008-05-01 | Seiko Epson Corp | Method for correcting output value of imaging means, shading correction method, defect detection method, defect detection program, and defect detection apparatus |
| CN201060169Y (en) * | 2007-01-26 | 2008-05-14 | 技茂自动科技股份有限公司 | Optical visible sensation testing apparatus |
| CN101346623A (en) * | 2005-12-26 | 2009-01-14 | 株式会社尼康 | Defect inspection device for inspecting defect by image analysis |
| CN101377576A (en) * | 2007-08-27 | 2009-03-04 | 东捷科技股份有限公司 | Method for accurately positioning flaw point of liquid crystal panel |
| CN101989156A (en) * | 2010-10-08 | 2011-03-23 | 苏州佳世达电通有限公司 | Method for calibrating sensing brightness of image sensor |
| CN103185729A (en) * | 2011-12-29 | 2013-07-03 | 百励科技股份有限公司 | Appearance inspection apparatus and execution method thereof |
| CN104142162A (en) * | 2013-05-08 | 2014-11-12 | 苏州弘邦资通物贸有限公司 | AOI visual detection device |
| CN104333706A (en) * | 2014-11-24 | 2015-02-04 | 嘉兴景焱智能装备技术有限公司 | Device and method for photographing object moving at high speed |
| CN106525873A (en) * | 2016-10-25 | 2017-03-22 | 广州市申发机电有限公司 | Machine vision based full-automatic rotation printed product defect detection device |
| CN206362717U (en) * | 2017-01-13 | 2017-07-28 | 深圳市视觉龙科技有限公司 | A kind of device of detection object surface defect |
| CN108270976A (en) * | 2016-12-30 | 2018-07-10 | 曦威科技股份有限公司 | With the image-sensing method and imaging sensor for rolling time for exposure compensation |
-
2018
- 2018-08-30 CN CN201811003796.0A patent/CN110876055B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005124317A2 (en) * | 2004-06-09 | 2005-12-29 | Cognex Technology And Investment Corporation | Method and apparatus for visual detection and inspection of objects |
| CN101346623A (en) * | 2005-12-26 | 2009-01-14 | 株式会社尼康 | Defect inspection device for inspecting defect by image analysis |
| JP2008102818A (en) * | 2006-10-20 | 2008-05-01 | Seiko Epson Corp | Method for correcting output value of imaging means, shading correction method, defect detection method, defect detection program, and defect detection apparatus |
| CN201060169Y (en) * | 2007-01-26 | 2008-05-14 | 技茂自动科技股份有限公司 | Optical visible sensation testing apparatus |
| CN101377576A (en) * | 2007-08-27 | 2009-03-04 | 东捷科技股份有限公司 | Method for accurately positioning flaw point of liquid crystal panel |
| CN101989156A (en) * | 2010-10-08 | 2011-03-23 | 苏州佳世达电通有限公司 | Method for calibrating sensing brightness of image sensor |
| CN103185729A (en) * | 2011-12-29 | 2013-07-03 | 百励科技股份有限公司 | Appearance inspection apparatus and execution method thereof |
| CN104142162A (en) * | 2013-05-08 | 2014-11-12 | 苏州弘邦资通物贸有限公司 | AOI visual detection device |
| CN104333706A (en) * | 2014-11-24 | 2015-02-04 | 嘉兴景焱智能装备技术有限公司 | Device and method for photographing object moving at high speed |
| CN106525873A (en) * | 2016-10-25 | 2017-03-22 | 广州市申发机电有限公司 | Machine vision based full-automatic rotation printed product defect detection device |
| CN108270976A (en) * | 2016-12-30 | 2018-07-10 | 曦威科技股份有限公司 | With the image-sensing method and imaging sensor for rolling time for exposure compensation |
| CN206362717U (en) * | 2017-01-13 | 2017-07-28 | 深圳市视觉龙科技有限公司 | A kind of device of detection object surface defect |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110876055A (en) | 2020-03-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5040228A (en) | Method and apparatus for automatically focusing an image-acquisition device | |
| US20090195669A1 (en) | Method and Apparatus for Detecting Camera Sensor Intensity Saturation | |
| CN109525840B (en) | Method for detecting weak defects on imaging chip | |
| US8531566B2 (en) | Image sensor and operating method | |
| CN110876055B (en) | External triggering linear camera detection system and image uniformity processing method thereof | |
| JP2015002241A (en) | Substrate imaging device, and substrate imaging method | |
| CN113533344A (en) | Optical detection device and method | |
| JP2006258582A (en) | Image input device and image input method | |
| CN110876020A (en) | External triggered linear camera detection system and image exposure processing method thereof | |
| TWI690692B (en) | Inspection system wth line camera under external trigger and image exposure processing method | |
| JP2001004339A (en) | Illumination non-uniformity measuring method for picture recognition inspecting system and picture recognition inspecting method | |
| TWI677680B (en) | Inspection system wth line camera under external trigger and image uniformity processing method | |
| US7551213B2 (en) | Method for detecting vertical transfer defects in image sensors | |
| KR20200055208A (en) | Apparatus and method for inspecting glass substrate | |
| JP2005265467A (en) | Defect detection device | |
| JPH11248643A (en) | Detection device for foreign matter in transparent film | |
| JP2014204198A (en) | Image processing device, control method thereof and program | |
| CN108627467B (en) | Method and device for detecting linearity of image sensor | |
| JP4549838B2 (en) | Glossiness measuring method and apparatus | |
| JP2012059213A (en) | Binarization processing method and image processing apparatus | |
| CN201673124U (en) | Automatic optical inspection system | |
| CN1193222C (en) | Method for scanner to detect defect on transmission-type negative film | |
| JP3841882B2 (en) | Appearance inspection method and appearance inspection apparatus | |
| KR20190105916A (en) | System for taking image of flexible oled cell | |
| JP3524117B2 (en) | Exposure control device and imaging device using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |