CN114245104A - Signal transmission method - Google Patents
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- CN114245104A CN114245104A CN202111436884.1A CN202111436884A CN114245104A CN 114245104 A CN114245104 A CN 114245104A CN 202111436884 A CN202111436884 A CN 202111436884A CN 114245104 A CN114245104 A CN 114245104A
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- 230000008054 signal transmission Effects 0.000 title claims abstract description 29
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- 239000004809 Teflon Substances 0.000 claims description 14
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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Abstract
The application relates to the field of chip detection, and provides a signal transmission method, which is applied to an image information acquisition module, wherein the image information acquisition module is connected with a product to be tested through a transmission line assembly, the transmission line assembly comprises at least two transmission lines, and the method comprises the following steps: receiving a signal to be tested of a product to be tested through a transmission line assembly, wherein the signal to be tested comprises an image signal and a power supply signal; sending the image signal to an image information acquisition module through a first transmission group of a transmission line assembly; and sending the power supply signal to the image information acquisition module through the second transmission group of the transmission line assembly. The technical scheme of this application can improve the stability of signal transmission between the product of awaiting measuring and the image information acquisition module, is favorable to the high-efficient completion of test.
Description
Technical Field
The invention relates to the field of chip detection, in particular to a signal transmission method.
Background
In the prior art, a flexible Printed circuit (fpc) is generally used for connecting an image sensor chip or a camera module formed based on the image sensor chip with an image information acquisition module, and the flexible Printed circuit (fpc) is also used as a flexible Printed circuit (fpc) or a flexible Printed circuit (fpc).
This connection has the following disadvantages:
the method is only suitable for the connection between an image sensor chip or a camera module with low transmission rate (such as MIPI D-PHY not higher than 1.5Gbps/Lane) and an image information acquisition module, and under the condition, the requirement of a test system can be met.
In the case of high speed, the FPC cannot meet the requirements of the test system, for example, problems such as unstable image data transmission, frame loss, and abnormal drawing may occur.
From the above, how to improve the stability of signal transmission is urgently needed to be solved.
Disclosure of Invention
The application provides a signal transmission method, which aims to solve the problem of poor signal transmission stability in the prior art.
The application provides a signal transmission method, which is applied to an image information acquisition module, wherein the image information acquisition module is connected with a product to be tested through a transmission line assembly, the transmission line assembly comprises at least two transmission lines, and the method comprises the following steps:
receiving a signal to be tested of the product to be tested through the transmission line assembly, wherein the signal to be tested comprises an image signal and a power supply signal;
sending the image signal to the image information acquisition module through a first transmission group of the transmission line assembly, and sending the power signal to the image information acquisition module through a second transmission group of the transmission line assembly;
the first transmission group comprises at least one transmission line of at least two transmission lines, and the second transmission group comprises at least another transmission line of the at least two transmission lines.
According to the technical scheme provided by the application, different from the prior art that a flexible circuit board is adopted to connect a product to be tested and an image acquisition module, so that signal transmission is unstable in high pixel or high speed, the technical scheme provided by the application is that at least two transmission lines are adopted to transmit an image signal and a power supply signal between the product to be tested and the image information acquisition module. Because the attenuation amplitude of the transmission line pair signal is far smaller than that of the flexible circuit board connecting line pair signal, the signal between the product to be tested and the image information acquisition module can be stably transmitted, and the high-efficiency completion of the test is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a signal transmission method provided in an embodiment of the present application;
FIG. 2 is a flow chart of an image sensor testing method provided by an embodiment of the present application;
FIG. 3 is a block diagram of a transmission line assembly provided by an embodiment of the present application;
fig. 4 is a structural diagram of a connection between a product to be tested and an image information acquisition module through a transmission line assembly according to an embodiment of the present application;
FIG. 5 is a schematic layout diagram of an image signal pin connected to a product to be tested and a pin connected to an image information acquisition module according to an embodiment of the present application;
fig. 6 is a schematic layout diagram of a pin of an image signal when a transmission line in a first transmission group of a transmission line assembly provided in the present application is a coaxial line and a transmission line in a second transmission group is a teflon line;
fig. 7 is a schematic layout diagram of a pin of an adaptation connection module and a pin of a port of a transmission line component according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this specification, adjectives such as first and second may only be used to distinguish one element or action from another, without necessarily requiring or implying any actual such relationship or order. References to an element or component or step (etc.) should not be construed as limited to only one of the element, component, or step, but rather to one or more of the element, component, or step, etc., where the context permits.
In the present specification, the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Fig. 1 is a schematic flow chart of a signal transmission method according to the present application. The method illustrated in fig. 1 is applied to an image information acquisition module, which is connected to a product to be tested via a transmission line assembly, which includes at least two transmission lines. The signal transmission method illustrated in fig. 1 mainly includes steps S101 to S103, which are detailed as follows:
step S101: and receiving a signal to be tested of the product to be tested through the transmission line assembly.
The signal to be tested comprises an image signal and a power supply signal.
In this application embodiment, the product that awaits measuring can be image sensor, can also be the camera module that image sensor constitutes. As shown in fig. 3, in one embodiment of the present application, a transmission line assembly includes a first connection port, a second connection port, a first transmission group, and a second transmission group. The first connection port of the transmission line assembly connected to the product to be tested includes a first port and a second port (not shown in the figure), and the second connection port connected to the image acquisition module includes a third port and a fourth port (not shown in the figure). The transmission line-based assembly includes at least two transmission lines, the first transmission group includes at least one of the at least two transmission lines, and the second transmission group includes at least another one of the at least two transmission lines.
Before a signal to be tested of a product to be tested is received through the transmission line assembly, the first port is connected with the first transmission group according to a first set connection mode; and connecting the second port with the second transmission group according to the first set connection mode. The first set connection mode is flexibly set according to specific requirements of customers. For example, if the output port of the product to be tested includes 40 pins (pins), and in the 40 pins, if the customer specifies pins 1 through 21 to transmit image signals and pins 22 through 40 to transmit power signals, the first set connection mode refers to: in the output port of the product to be tested, image signals are transmitted by pins 1-21, and power signals are transmitted by pins 22-40.
Accordingly, the receiving of the signal to be tested of the product to be tested through the transmission line assembly may be: the image signal is received through the first port and the power signal is received through the second port. In an embodiment, please refer to fig. 5, in combination with fig. 5 and the first set connection manner described above, specifically, P1 represents a first connection port, and further, in the first connection port P1, pins 1 to 21 represent a first port, and pins 22 to 40 represent a second port. At this time, the first ports pin1 to pin21 are used for receiving image signals of the product to be tested, and the second ports pin22 to pin40 are used for receiving power signals of the product to be tested.
Step S102: and sending the image signal to an image information acquisition module through a first transmission group of the transmission line assembly.
Step S103: and sending the power supply signal to the image information acquisition module through the second transmission group of the transmission line assembly.
In an embodiment, with reference to fig. 5, and with reference to fig. 5 and the first setting connection manner described above, specifically, P2 denotes a second connection port, and further, in the second connection port P2, pins 1 to 21 denote a third port, and pins 22 to 40 denote a fourth port. At this time, the first ports pins 1 to 21 and the third ports pins 1 to 21 are connected through 21 coaxial lines in the first transmission group, and the second ports pins 22 to 40 and the fourth ports pins 22 to 40 are connected through 19 coaxial lines in the second transmission group.
Therefore, the image signal of the product to be tested is transmitted to the image information acquisition module through the first port, the first transmission group and the third port, and the power signal of the product to be tested is transmitted to the image information acquisition module through the second port, the second transmission group and the fourth port. It is worth mentioning that the coaxial lines transmit the same signal and are regarded as being connected in parallel, so that direct current resistance generated in the signal transmission process can be reduced, voltage drop generated when a power supply signal flows through the coaxial lines is reduced, and the risk of causing abnormal work of a product to be tested is reduced.
Through the cooperation of the embodiment, the first transmission set and the second transmission set of the coaxial line with the same material are adopted to replace the flexible printed circuit board, so that the requirement of the test system can be met, namely the test system is suitable for the situation of high transmission rate (such as MIPI D-PHY not higher than 2.5 Gbps/Lane).
Further, with the development of pixels, speed and frame rate towards high speed, when power signal transmission is performed, the coaxial line with large direct current resistance may cause too large voltage attenuation of the product to be tested, and finally, the abnormal operation of the product to be tested may be affected.
Therefore, in another embodiment, referring to fig. 6 and the first set connection mode, specifically, P1 denotes a first connection port, P2 denotes a second connection port, further, in the first connection port P1, pins 1 to 21 denote the first port, pins 22 to 40 denote the second port, in the second connection port P2, pins 1 to 21 denote the third port, and pins 22 to 40 denote the fourth port. At this time, the first ports pins 1 to 21 and the third ports pins 1 to 21 are connected through 21 coaxial lines in the first transmission group, and the second ports pins 22 to 40 and the fourth ports pins 22 to 40 are connected through 19 teflon lines in the second transmission group.
Therefore, the image signal of the product to be tested is transmitted to the image information acquisition module through the first port, the first transmission group and the third port, and the power signal of the product to be tested is transmitted to the image information acquisition module through the second port, the second transmission group and the fourth port.
Through the cooperation of the embodiment, the first transmission set (coaxial line) and the second transmission set (Teflon line) which are made of different materials are adopted to replace a flexible circuit board, so that the requirement of the test system can be met, and the test system is suitable for the situation of higher transmission rate (for example, MIPI D-PHY is higher than 2.5 Gbps/Lane).
As described above, the first set connection mode is flexibly set according to the specific requirements of the customer, and the inventor finds that, if the first set connection mode is changed, the connection mode between the product to be tested and the first connection port is changed, so that the internal connection mode between the first connection port and the first transmission group and the internal connection mode between the first connection port and the second transmission group are affected, and the external connection mode between the second connection port and the image information acquisition module is affected, in other words, all the connection modes are affected by the first set connection mode, which is not favorable for realizing the mass production of the transmission line assembly.
Therefore, a self-adaptive mode is provided, so that the internal connection mode of the transmission line assembly and the external connection mode of the image information acquisition module are ensured to be not required to be changed, and the batch production of the transmission line assembly is facilitated.
Referring back to fig. 1, in an embodiment of the present application, a signal transmission method includes the following steps:
step S101: and receiving a signal to be tested of the product to be tested through the transmission line assembly.
The signal to be tested comprises an image signal and a power supply signal.
In this application embodiment, the product that awaits measuring can be image sensor, can also be the camera module that image sensor constitutes.
As shown in fig. 4, in another embodiment of the present application, the transmission line assembly further includes an adaptive connection module, connected to the first connection port through the adaptive connection module, and connected to the product to be tested through the first connection port, where the adaptive connection port includes a first adaptive port, a second adaptive port, a third adaptive port, and a fourth adaptive port.
Before a signal to be tested of a product to be tested is received through the transmission line assembly, the first port is connected with the first adaptive port according to a first set connection mode; establishing signal connection between the first adaptive port and the third adaptive port according to a second set connection mode, and connecting the third adaptive port with the first transmission group; connecting the second port with the second adaptive port according to a first set connection mode; and establishing signal connection between the second adaptive port and the fourth adaptive port according to a second set connection mode, and connecting the fourth adaptive port with the second transmission group.
In the above embodiment, the second connection mode is different from the first connection mode, and means that the connection mode between the second connection port and the image information acquisition module does not change along with the change of the first connection mode.
As shown in fig. 7, the number of pins of the input port P3 (which may correspond to the first adaptor port and the second adaptor port of fig. 4) of the adaptor connection module is 1-40, the power signal and the image signal of the product to be tested provided by the customer are received from the first connection port P1 according to the first set connection manner, the number of pins of the output port P4 (which may correspond to the third adaptor port and the fourth adaptor port of fig. 4) is also 1-40, the power signal and the image signal of the product to be tested are correspondingly transmitted to the second connection port P2 through the second transmission group and the first transmission group respectively according to the second set connection manner, and the power signal and the image signal of the product to be tested are further transmitted to the image information collection module through the second connection port P2.
For example, assume that an output port of a product to be tested provided by a customer includes 40 pins (pins), and in the 40 pins, if the customer designates pins 1 to 19 to transmit power signals and pins 20 to 40 to transmit image signals, the first set connection mode refers to: in the output port of the product to be tested, power signals are transmitted by pins 1-19, and image signals are transmitted by pins 20-40. Correspondingly, according to the first set connection mode, in the first connection port P1, the first ports pin20 to pin40 are used for receiving the image signal of the product to be tested, and the second ports pin1 to pin19 are used for receiving the power signal of the product to be tested.
The connection mode between the second connection port P2 and the image information acquisition module is assumed to be fixed, that is, the third port (P2: pins 1-21) is used for sending the image signals of the product to be tested, and the fourth port (P2: pins 22-40) is used for sending the power signals of the product to be tested. Namely, the second setting connection mode means: in the second connection port P2, the third ports pin1 to pin21 are used for sending image signals of the product to be tested, and the fourth ports pin22 to pin40 are used for sending power signals of the product to be tested. Then, since the first set connection manner and the second set connection manner are different, that is, the same pins do not have a one-to-one correspondence relationship, the first port and the third port cannot be directly connected by the connection manners such as plugging, pressing, and the like, and/or the second port and the fourth port are connected, at this time, the adaptive connection module needs to be used for implementing adaptive connection.
Specifically, in the adaptive connection module, according to a first set connection mode, a first adaptive port (P3: pins 20-pin 40) is connected with a first port (P1: pins 20-pin 40), and a second adaptive port (P3: pins 1-pin 19) is connected with a second port (P1: pins 1-pin 19), so that the first adaptive port (P3: pins 20-pin 40) receives an image signal of a to-be-tested product, and the second adaptive port (P3: pins 1-pin 19) receives a power signal of the to-be-tested product.
Further, since the second setting connection means is: in the second connection port P2, the third ports pin1 to pin21 are used for sending image signals of the product to be tested, and the fourth ports pin22 to pin40 are used for sending power signals of the product to be tested. Correspondingly, the third adaptive port (P4: pin 1-pin 21) connected with the third port is used for transmitting the image signals of the to-be-tested products, and the fourth adaptive port (P4: pin 22-pin 40) connected with the fourth port is used for transmitting the image signals of the to-be-tested products.
At this time, according to the second set connection mode, signal connection needs to be established between the first adaptive port (P3: pins 20 to pin40) and the third adaptive port (P4: pins 1 to pin21), and signal connection needs to be established between the second adaptive port (P3: pins 1 to pin19) and the fourth adaptive port (P4: pins 22 to pin40), specifically: p3[40:20] ═ P4[21:1], P3[19:1] ═ P4[40:22], so that adaptive connection between the product to be tested provided by the customer and the image information acquisition module through the transmission line assembly is completed.
In another embodiment of the present application, the second connection port, where the transmission line assembly is connected to the image information acquisition module, includes a third port and a fourth port, and the first transmission group is connected to the third port before the transmission line assembly receives a signal to be tested of a product to be tested; the second transmission group is connected to the fourth port.
Step S102: and sending the image signal to an image information acquisition module through a first transmission group of the transmission line assembly.
The second connecting port corresponding to the connection of the transmission line assembly and the image information acquisition module comprises a third port and a fourth port, and the first transmission group is connected with the third port before the transmission line assembly receives a signal to be tested of a product to be tested; in the embodiment of connecting the second transmission group and the fourth port, the sending of the image signal to the image information acquisition module through the first transmission group of the transmission line assembly may be: and sending the image signal to an image information acquisition module through a third port. Specifically, the second ends of the at least two coaxial lines are connected with the image signal pins which are fixedly arranged, the image signals are transmitted to the image information acquisition module through the third port, that is, each of the coaxial lines at the second ends of the at least two coaxial lines is connected with each of the image signal pins which are fixedly arranged, and the image signals are transmitted to the image information acquisition module through the third port.
In order to reduce the dc resistance, an embodiment of receiving the image signal from the product to be tested, corresponding to the connection of at least every two coaxial lines at the first ends of the at least two coaxial lines with each image signal pin in the image signal pins fixedly arranged, as an embodiment of the present application, the connection of each coaxial line at the second ends of the at least two coaxial lines with each image signal pin in the image signal pins fixedly arranged, and the transmission of the image signal to the image information acquisition module through the third port may be: at least every two coaxial lines at the second ends of the at least two coaxial lines are connected with each image signal pin in the image signal pins which are fixedly arranged, and the image signals are transmitted to the image information acquisition module through the image signal pins which are fixedly arranged. In other words, at least every two coaxial lines in the coaxial lines of the transmission line assembly are connected in parallel, and at least every two coaxial lines transmit the image signal of one image signal pin to one image signal pin in the fixedly arranged image signal pins. Corresponding to being connected with the mapped image signal pin through the first ends of the at least two coaxial lines, receiving the image signal from the product to be tested, as an embodiment of the present application, the sending of the image signal to the image information acquisition module through the third port in the above embodiment may also be: and the second ends of the at least two coaxial lines are connected with the mapped image signal pins, and the image signals are transmitted to the image information acquisition module through the mapped image signal pins.
Step S103: and sending the power supply signal to the image information acquisition module through the second transmission group of the transmission line assembly.
It should be noted that, in the above embodiments, the transmission lines in the first transmission group and the transmission lines in the second transmission group may be made of the same material, for example, both the transmission lines are coaxial lines or both the transmission lines are teflon lines, and the transmission lines in the first transmission group and the transmission lines in the second transmission group may also be made of different materials, for example, the transmission lines in the first transmission group are coaxial lines and the transmission lines in the second transmission group are teflon lines, or the transmission lines in the first transmission group are teflon lines and the transmission lines in the second transmission group are coaxial lines. As shown in fig. 6, when the transmission line in the first transmission group of the transmission line assembly is made of a coaxial line and the transmission line in the second transmission group of the transmission line assembly is made of a teflon line, the arrangement of the pins of the image signal is schematically illustrated, that is, the pins numbered 1 to 21 are connected to the 36# blue coaxial line, and the pins numbered 22 to 40 are connected to the 32# teflon line. Of course, in other embodiments, the coaxial line is not limited to blue, and may also be red, and the diameter of the coaxial line/teflon line is suitable for 32#, 36#, 38#, 40# and the like, which is not limited herein.
The second connection port corresponding to the connection between the transmission line assembly and the image information acquisition module includes a third port and a fourth port, and in the embodiment where the second transmission group is connected to the fourth port before the transmission line assembly receives the signal to be tested of the product to be tested, step S103 may be to transmit the power signal to the image information acquisition module through the fourth port by transmitting the power signal to the image information acquisition module through the second transmission group of the transmission line assembly.
In view of the fact that the coaxial line has a large direct-current resistance, which causes a large voltage attenuation of the power signal, and thus causes the product to be tested to operate abnormally, in an embodiment of the signal transmission line, the power signal is sent to the image information acquisition module through the fourth port, and the power signal can be transmitted between the product to be tested and the image information acquisition module through at least two teflon lines of the transmission line assembly. The Teflon lines can effectively reduce direct current resistance when transmitting power signals, thereby solving the problem that the voltage attenuation of a product to be tested is large. It should be noted that, when the transmission line assembly includes at least two coaxial lines and at least two teflon lines for transmitting power signals, the number of the pins may be equal to the sum of the number of the coaxial lines of the transmission line assembly and the number of the teflon lines.
As can be seen from the signal transmission method illustrated in fig. 1, unlike the prior art in which a flexible printed circuit board (fpc) is used to connect an image sensor and an image detection device, which results in unstable signal transmission that requires frequent updating of the fpc and has a high pixel or high rate, the technical solution of the present application is to transmit an image signal and a power signal between a product to be tested and an image information acquisition module by using a transmission line assembly including at least two transmission lines. On one hand, the transmission line is superior to the flexible circuit board in strength, so that frequent replacement is not needed; on the other hand, the attenuation amplitude of the transmission line to the image signal is far smaller than that of the flexible circuit board connecting line to the image signal, so that the image signal between the image sensor and the image information acquisition module can be stably transmitted, and the high-efficiency completion of the test is facilitated.
Based on the transmission line assembly including at least two transmission lines in the above embodiment, the transmission line assembly includes a first transmission group and a second transmission group, where the first transmission group includes at least one transmission line of the at least two transmission lines, and the second transmission group includes at least another transmission line of the at least two transmission lines.
In one embodiment, the first transmission group includes 21 transmission lines and the second transmission group includes 19 transmission lines.
In one embodiment, the transmission lines in the first transmission group and the transmission lines in the second transmission group are made of the same material, and the material is coaxial.
In one embodiment, the transmission lines in the first transmission group are coaxial lines and the transmission lines in the second transmission group are made of different materials.
The present application further provides a product testing method, as shown in fig. 2, the product testing method mainly includes steps S201 to S204, which are detailed as follows:
step S201: and connecting the product to be tested through the configured interface, and establishing communication connection with the product to be tested.
In this embodiment, the product to be tested may be an image sensor, the configured interfaces include interfaces supporting a Sony sub-LVDS protocol, a Panasonic sub-LVDS protocol, an Aptina HiSPi protocol, and the like, and may be provided by a connection board, where the connection board is a matrix-type conversion connector, and supports an MIPI interface, a paralel interface, a sub-LVDS interface, an SPI interface, a HiSPi interface, and the like, so as to ensure that the products to be tested with different interface types can be connected with the image information acquisition module, thereby improving the universality of the image information acquisition module.
Step S202: the configuration parameter loading is performed on the product to be tested through the communication connection established through step S201.
Before a product to be tested enters a normal working state, namely before an image can be shot to generate image data required by the image information acquisition module, configuration parameters need to be configured. The configuration parameters include the rated voltage of the product to be tested, the interface type, the communication address, the image format and the image size, etc. As an embodiment of the present application, the loading of the configuration parameters to the product to be tested through the communication connection established in step S201 may be: obtaining an identifier of a product to be tested through the communication connection established through the step S201; matching configuration parameters corresponding to the product to be tested in a preset database file according to the identifier of the product to be tested to obtain at least one configuration parameter; and traversing the configuration parameter loading of the product to be tested according to each configuration parameter, wherein the configuration parameter loading of the product to be tested is successful through the traversal, identifiers corresponding to a plurality of test products and configuration parameters thereof are stored in a preset database file in an associated manner, the identifier of the product to be tested is used for identifying the product to be tested, in other words, the product to be tested can be determined through the identifier of the product to be tested. For example, the identifier may be an IIC communication address of the product to be tested, a hardware device identification code of the product to be tested, and the like. In this embodiment, the configuration parameter loading traversal is performed on the product to be tested according to each configuration parameter, and the configuration parameter loading of the product to be tested is successful through the traversal, which may be implemented by generating a configuration parameter list according to the matched configuration parameters, then sequentially loading the configuration parameters in the configuration parameter list to the product to be tested according to the arrangement order of the configuration parameters in the configuration parameter list, and if the configuration parameter loading of the product to be tested is successful, stopping the traversal of the configuration parameter loading of the product to be tested. It should be noted that, the traversal in the above embodiment refers to continuing to load the next configuration parameter when the test product fails to load the previous configuration parameter. Further, the traversal may be performed in a specified order or randomly, which is not limited in the present application.
Step S203: and when the loading of the configuration parameters of the product to be tested is successful, acquiring image data generated by the product to be tested.
Step S204: and according to a set working mode, carrying out image detection on the acquired image data to test whether the product to be tested has defects, wherein the working mode comprises independent image detection based on an embedded operating system.
In the embodiment of the present application, the operation modes may include three modes, that is, an operation mode 1: a mode for independently carrying out image detection based on an embedded operating system; the working mode 2 is as follows: a mode in which the image information acquisition module and an upper computer (for example, a PC) cooperate to perform image detection; working mode 3: the image information acquisition module uploads an image obtained by a product to be tested to an upper computer (for example, a PC) and is used for image detection, wherein the image detection is independently performed based on an embedded operating system, specifically, an ARM embedded operating system, such as Linux, and the like, is built in the image information acquisition module, test software is run to independently complete all test work, and the image information acquisition module does not independently complete all work of image detection in the last two working modes, for example, in the working mode 2, the image information acquisition module and the upper computer work in parallel, namely, when the image information acquisition module transmits image data to the upper computer, the upper computer performs image detection, and in the working mode 3, the image information acquisition module and the upper computer work in series, namely, after the image information acquisition module completely transmits the image data to the upper computer, the upper computer starts the image detection. The embodiment of the application mainly describes a technical scheme for performing image detection on acquired image data to test whether a product to be tested has defects according to the working mode 1.
As an embodiment of the present application, according to a working mode of independently performing image detection based on an embedded operating system, performing image detection on acquired image data to test whether a product to be tested has a defect may be: collecting background data of effective pixel points of a product to be tested; determining the maximum value and the minimum value of the background data of the effective pixel points and the maximum average value and the minimum average value of the background data in each effective pixel point; and detecting whether the product to be tested is qualified or not according to the maximum value and the minimum value of the background data and the maximum average value and the minimum average value of the background data in each effective pixel point.
In the above embodiment, the background data of the effective pixel point of the product to be tested may be collected as follows: and acquiring background data of the effective pixel points of the product to be tested within preset time, or acquiring the background data of the effective pixel points of the product to be tested according to preset times. It should be noted that, the background data of the effective pixel points of the product to be tested is collected within the preset time, the background data of the effective pixel points of the product to be tested can be collected for many times, and the more the collected background data is, the higher the reliability of the detected result is. According to the maximum value and the minimum value of the background data and the maximum average value and the minimum average value of the background data in each effective pixel point, whether the product to be tested is qualified or not can be specifically detected as follows: calculating the difference between the maximum value and the minimum value of the background data and the difference between the maximum average value and the minimum average value of the background data; and if the difference between the maximum value and the minimum value of the background data is smaller than the preset fluctuation value and the difference between the maximum average value and the minimum average value of the background data is smaller than the first preset average value, determining that the product to be tested is qualified, otherwise, if the difference between the maximum value and the minimum value of the background data is not smaller than the preset fluctuation value or the difference between the maximum average value and the minimum average value of the background data is not smaller than the first preset average value, determining that the product to be tested has defects, namely, the quality of the product to be tested is unqualified.
As another embodiment of the present application, according to a working mode of independently performing image detection based on an embedded operating system, performing image detection on acquired image data to test whether a product to be tested has a defect may be implemented by the following steps S1 to S4:
step S1: and acquiring an exposure image which is acquired by the product to be tested and is matched with the current exposure configuration parameter, wherein the current exposure configuration parameter is any one of at least two preset groups of exposure configuration parameters.
In the embodiment of the application, the exposure configuration parameters can be preset, and multiple groups of exposure configuration parameters with different characteristics can be set according to different detected defective pixel attributes, wherein the defective pixel attributes can include bright defective pixels, pixels with inconsistent brightness, dark defective pixels or pixels with inconsistent darkness. In the embodiment of the application, the pixels with higher brightness value than the surrounding pixels are collectively called as bright defective pixels, and the defective pixels with lower brightness value than the surrounding pixels are collectively called as dark defective pixels; the exposure configuration parameters may specifically include exposure gain, exposure shutter time, and/or aperture size.
Step S2: and carrying out defective pixel point detection on the exposure image to obtain an initial defective pixel point set.
Specifically, the implementation of step S2 may include steps S21 through S24 as follows:
step S21: and reading the brightness values and the position information of all pixel points in the exposure image.
Step S22: and judging whether the current detection type is a bright and bad pixel point, if so, entering a step S23, and otherwise, entering a step S24.
Step S23: and sequentially judging whether the brightness value of each pixel point is greater than a preset first abnormal detection threshold value, and if so, adding the position information corresponding to the current pixel point to the initial bad pixel point set.
Step S24: and sequentially judging whether the brightness value of each pixel point position is smaller than a preset second abnormity detection threshold value, and if so, adding the position information corresponding to the current pixel point to the initial bad pixel point set.
Step S3: triggering a product to be tested to continuously acquire exposure images matched with the current exposure configuration parameters, verifying the positions of the corresponding defective pixel points in the initial defective pixel point set in each acquired exposure image and recording verification results, and analyzing the verification results of the exposure images of all frames to obtain final defective pixel point information matched with the current exposure configuration parameters when the number of frames of the exposure images reaches a preset number of frames.
Step S4: and (4) taking any group of exposure configuration parameters which are not subjected to exposure image acquisition as the current exposure configuration parameters, returning to the step (S1) until the final defective pixel point information corresponding to each group of exposure configuration parameters is completely confirmed, and combining all the final defective pixel point information to obtain the defective pixel of the product to be tested.
Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application. The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present invention.
Claims (10)
1. A signal transmission method is characterized in that the method is applied to an image information acquisition module, the image information acquisition module is connected with a product to be tested through a transmission line assembly, the transmission line assembly comprises at least two transmission lines, and the method comprises the following steps:
receiving a signal to be tested of the product to be tested through the transmission line assembly, wherein the signal to be tested comprises an image signal and a power supply signal;
sending the image signal to the image information acquisition module through a first transmission group of the transmission line assembly;
sending the power supply signal to the image information acquisition module through a second transmission group of the transmission line assembly;
the first transmission group comprises at least one transmission line of at least two transmission lines, and the second transmission group comprises at least another transmission line of the at least two transmission lines.
2. The signal transmission method of claim 1, wherein the first connection port of the transmission line assembly to which the product to be tested is connected includes a first port and a second port;
before the signal to be tested of the product to be tested is received through the transmission line assembly, the method further comprises the following steps:
connecting the first port with the first transmission group according to a first set connection mode;
and connecting the second port with the second transmission group according to the first set connection mode.
3. The signal transmission method of claim 1, wherein the first connection port of the transmission line assembly to which the product to be tested is connected includes a first port and a second port;
the transmission line assembly further comprises an adaptive connection module, wherein the adaptive connection module comprises a first adaptive port and a second adaptive port which are used for connecting the product to be tested, and a third adaptive port and a fourth adaptive port which are used for connecting the transmission line;
before the signal to be tested of the product to be tested is received through the transmission line assembly, the method further comprises the following steps:
connecting the first port with the first adaptive port according to a first set connection mode;
establishing signal connection between the first adaptive port and the third adaptive port according to a second set connection mode, and connecting the third adaptive port with the first transmission group;
connecting the second port with the second adaptive port according to the first set connection mode;
and establishing signal connection between the second adaptive port and the fourth adaptive port according to the second set connection mode, and connecting the fourth adaptive port with the second transmission group.
4. The signal transmission method according to claim 2 or 3, wherein said receiving a signal to be tested of said product to be tested through said transmission line assembly comprises:
and receiving the image signal through the first port and receiving the power supply signal through the second port.
5. The signal transmission method according to claim 1, wherein the second connection port to which the transmission line assembly is connected with the image information acquisition module includes a third port and a fourth port;
before the signal to be tested of the product to be tested is received through the transmission line assembly, the method further comprises the following steps:
connecting the first transmission set with the third port;
connecting the second transmission group with the fourth port.
6. The signal transmission method according to claim 5, wherein the transmitting the image signal to the image information acquisition module through the first transmission group of the transmission line assembly includes:
and sending the image signal to the image information acquisition module through the third port.
7. The signal transmission method according to claim 5, wherein the transmitting the power signal to the image information acquisition module through the second transmission group of the transmission line assembly includes:
and sending the power supply signal to the image information acquisition module through the fourth port.
8. The signal transmission method of claim 1, wherein the transmission lines in the first transmission group and the transmission lines in the second transmission group are of the same material.
9. The signal transmission method of claim 1, wherein the transmission lines in the first transmission group and the transmission lines in the second transmission group are of different materials.
10. The signal transmission method according to claim 8 or 9, wherein the material is a coaxial line or a teflon line.
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