CN115615667A - Image multiple exposure method and image vision alignment device - Google Patents

Abstract

The invention provides an image multiple exposure method, which comprises the following steps: presetting a plurality of first exposure brightness based on the light reflection rate of the light receiving surfaces of the objects to be detected; setting a current exposure brightness demand instruction in an upper computer based on the first exposure brightness; and controlling the exposure brightness to expose the object to be detected based on the current exposure brightness demand instruction. The image multiple exposure method can implement multiple exposure visual alignment detection on products with different light transmittances without adjusting the exposure time, can effectively avoid the problem of 'heat noise', and is flexible to apply and convenient to operate; the detection efficiency is improved and the detection process is optimized. The image vision alignment device provided by the invention comprises an upper computer, a light source control module and an image capturing module which are in communication connection with each other, and has corresponding advantages.

Description

Image multiple exposure method and image vision alignment device

Technical Field

The invention belongs to the technical field of visual alignment detection equipment, and particularly relates to an image multiple exposure method and a corresponding image visual alignment device.

Background

The method has the advantages of no contact, rapidness, accuracy and intellectualization compared with the traditional measurement and inspection method by using the machine vision-based technology to carry out measurement and inspection. Particularly, in the panel inspection industry, as the quality requirement is higher and higher, the high-precision image vision alignment system is more and more applied to the panel inspection process.

The core of visual alignment detection is the collection and processing of images, all information comes from the collected images, and the quality of the images is extremely critical. For the current panel inspection industry, the forms of client products are increasingly diversified, the light transmittances of products with different forms are different, and in order to adapt to the client products, image acquisition equipment of an image vision alignment system needs multiple exposures to cope with the client products. In the common high-precision alignment technical scheme, the exposure time of the image acquisition equipment is changed to improve the light sensitivity of the image acquisition equipment sensor so as to realize image capture and photographing of products with different light transmittance, but in the method, the image acquisition equipment needs to be exposed for a long time, the long-time exposure can cause the temperature of the image acquisition equipment sensor to rise, the image acquisition equipment is possibly overheated, and the phenomenon of increasing noise points is called 'thermal noise'. The 'thermal noise' can greatly affect the image quality, even the image is distorted, and the detection requirement cannot be met. The long-time exposure method indirectly influences the precision and stability of image capturing, meanwhile, the exposure time of the image acquisition equipment is increased, so that the TT (Tact time, beat time) is obviously increased, and the comprehensive output capacity of the equipment is finally reduced. This is contrary to the actual requirement that enterprises need to continuously optimize quality and continuously improve production efficiency, so it is not an effective way to take pictures of products with different light transmittances by changing exposure time, and the scheme in the prior art that different exposures are obtained by changing the exposure time of the image acquisition device sensor through software has a defect.

Therefore, there is a need to develop an image multiple exposure method and a corresponding image vision alignment apparatus, which can be applied to multiple exposure image capture for photographing products with different light transmittances, meet the requirement of detection accuracy without increasing TT (takt time), and further promote the deep development and effective application of vision alignment detection technology.

Disclosure of Invention

The present invention provides an image multiple exposure method and a corresponding image vision alignment device for solving all or part of the problems in the prior art, and is suitable for multiple exposure vision alignment of image vision alignment.

The invention provides an image multiple exposure method, which comprises the following steps: presetting a plurality of first exposure brightness based on the light reflection rate of the light receiving surfaces of the objects to be detected; setting a current exposure brightness demand instruction in an upper computer based on the first exposure brightness; and controlling the exposure brightness to expose the object to be detected based on the current exposure brightness demand instruction.

The luminousness of the object to be measured of different forms is different, the sensitive surface (towards the one side of exposure light source) of object to be measured when exposing will have different reflection rates, in the general condition of enterprise production, the kind of object to be measured generally all has a scope, it is knowable to have how many kinds of different reflection rates, through corresponding a plurality of first exposure luminance of presetting, can satisfy the exposure demand of the object to be measured in the detection to different forms, through corresponding current exposure luminance demand instruction of setting for in the host computer, control exposure light source that can be convenient in the work provides the required exposure luminance of current detection, the problem and the defect that image acquisition equipment need long-time exposure to produce have been avoided, and can satisfy the requirement of the object to be measured high accuracy detection of different forms in a flexible way, detection efficiency is higher, the restriction of further reducing the takt time of current way has been broken through.

The method for presetting a plurality of first exposure brightnesses based on the light reflection rates of the light receiving surfaces of a plurality of objects to be detected comprises the following steps: and acquiring the light reflection rates of the light receiving surfaces of the plurality of objects to be detected, and setting the light reflection rates of the plurality of first exposure brightnesses and the light receiving surfaces of the plurality of objects to be detected to be in negative correlation. The light reflection rate of the illuminated surface of the object to be measured is in negative correlation with the exposure brightness, namely the higher the light reflection rate of the illuminated surface of the object to be measured is, the lower the corresponding exposure brightness is. The method comprises the steps of obtaining the light reflection rates of a plurality of light receiving surfaces of objects to be detected, setting the first exposure brightness and the light reflection rates of the light receiving surfaces of the objects to be detected to be in negative correlation by taking the magnitude of the light reflection rates as an independent variable and the first exposure brightness as a dependent variable.

In general, the image multiple exposure method further includes setting a second exposure brightness based on a light reflectance of a light-receiving surface of the current object to be measured, and setting the current exposure requirement command based on the second exposure brightness. The scheme of manually setting the second exposure brightness is provided, when the object to be detected is a brand-new product or a plurality of preset first exposure brightness due to factors such as environment and the like cannot completely meet the current detection requirement, the second exposure brightness can be manually set, the current exposure requirement instruction is set through the upper computer, and the accurate exposure brightness is controlled and provided to meet the current detection precision requirement.

The method for setting the current exposure demand instruction in the upper computer comprises the following steps: providing a control in an upper computer, wherein the control comprises a plurality of options and an input box; the multiple options correspond to the multiple first exposure brightness, and the input box is used for inputting the second exposure brightness; and selecting the option to set a current exposure requirement instruction or manually inputting a numerical value in an input frame to set the current exposure requirement instruction.

The light reflection rates of the light receiving surfaces of the multiple objects to be tested are obtained in advance according to the products (objects) which are known to need to be tested in the actual test work, and the corresponding first exposure brightness can be set quickly for the light reflection rate of the light receiving surface of the known object to be tested by operating the options. When a new product to be tested is temporarily met or specific environmental factors are considered in the actual test work, the second exposure brightness can be manually set based on the light reflection rate of the light receiving surface of the current object to be tested by inputting the numerical value in the input box, and the diversified requirements in production application are further met.

The method for controlling the exposure brightness based on the current exposure brightness demand instruction comprises the following steps: when the upper computer sends different exposure brightness requirement instructions, different intermediate relays are powered on; the current exposure brightness is set by controlling different intermediate relays to be electrified. The current exposure brightness can be switched by controlling the intermediate relay, the switching speed is high, and the exposure is more stable.

The different intermediate relays are connected with different exposure light sources; and controlling different intermediate relays to be electrified so as to lighten corresponding exposure light sources to obtain the current exposure brightness. Can set up a plurality of exposure light sources, every exposure light source provides different exposure luminance, and the exposure luminance that the current work needs is obtained to the exposure light source that switches work through control intermediate relay power on fast, and easy to carry out, be convenient for operate, job stabilization nature is better, the error probability is littleer.

The invention provides an image vision alignment device, which comprises an upper computer, a light source control module and an image capturing module which are in communication connection with each other; the image capturing module comprises at least one exposure light source and image acquisition equipment; the light source control module comprises a light source adapter and a programmable control module; the light source adapter comprises at least two light source brightness adjusting channels, and each light source brightness adjusting channel is electrically connected with the exposure light source through the programmable control module; and the programmable control module is in communication connection with the upper computer and is electrically connected with the exposure light source. The upper computer is used for setting and sending an exposure brightness demand instruction, the programmable control module is respectively electrically connected with the light source brightness adjusting channel and the exposure light source so as to realize the electrical connection of the light source adjusting channel and the exposure light source, and the programmable control module responds to the exposure brightness demand instruction to switch the light source brightness adjusting channel and control the exposure brightness provided by the exposure light source. The light source adjusting channels can be connected with the exposure light sources in a one-to-one correspondence mode to achieve the purpose that different exposure light sources are used for providing different brightness, and a plurality of light source brightness adjusting channels can be connected with one exposure light source to adjust the same exposure light source to provide different brightness for exposure. Based on the exposure brightness requirement instruction, the programmable control module correspondingly switches the light source brightness adjusting channel according to the image vision alignment actual working object, and adjusts or switches different exposure brightness for image capture. The method can implement multiple exposure aiming at products with different light transmittances without adjusting the exposure time of the image acquisition equipment, has convenient and efficient operation, and avoids the defects of unsatisfactory image quality, substandard test precision and low reliability of test results caused by implementing the multiple exposure of the products with different transmittances depending on the length of the exposure time.

The programmable control module comprises a control unit and a line switch unit which are electrically connected; the circuit switch unit is also electrically connected with the light source brightness adjusting channel and the exposure light source respectively.

The circuit switch unit comprises at least two intermediate relays, and the number of the intermediate relays is consistent with that of the light source brightness adjusting channels; the control unit comprises an IO channel in communication connection with the upper computer; the IO channel is electrically connected with the intermediate relay, and the output signal controls whether the intermediate relay is attracted or not so as to switch on or off the corresponding light source brightness adjusting channel. And the control unit receives the exposure brightness demand instruction and controls whether the corresponding intermediate relay is attracted or not so as to switch on or off the corresponding light source brightness adjusting channel.

The number of the IO channels is not less than that of the intermediate relays.

The dimming signal output by the light source brightness adjusting channel corresponds to the set value of the exposure brightness or the increase and decrease of the exposure brightness.

The light source control module can control the exposure brightness provided by the exposure light source according to a brightness set value in the upper computer, and can definitely correspond to specific light transmittance of products in different forms to meet specific exposure brightness requirements in current detection work or adjust the increase or decrease of the exposure brightness according to actual conditions. The control signal output by the IO channel and the dimming signal are in one-to-one correspondence to control the exposure light source to provide the set value; or the control signal output by the IO channel corresponds to a plurality of dimming signals, and the dimming signals are selected to increase or decrease the exposure brightness. The control unit is at least provided with two IO channels and used for outputting two different control signals, and the control signals are respectively used for controlling the exposure brightness to increase or decrease. When the exposure brightness does not obtain a definite set value in the actual detection work, an operator can gradually adjust the exposure brightness through the switching of the control signal until the exposure brightness meeting the requirement is obtained, so that the convenience and flexibility of operation are facilitated.

The light source adapters are multiple and are connected with the same power supply through a serial line to supply power; and the port of the control unit is electrically connected with the upper computer through a serial line. The control unit can be expanded according to the specific requirements in the application of the actual image vision alignment system and is electrically connected with the same upper computer, for example, when the ports of the control unit are insufficient, the control unit can be expanded into a plurality of control units. The corresponding light source adapter can also be correspondingly set in combination with the expansion requirement, and a serial line led out through the cascade interface can be controlled by an upper computer. The programmable control module is in communication connection with the upper computer, the same upper computer can be operated to implement control, and the structure is simple and convenient to use.

The programmable control module is realized by adopting a PLC controller. The integration level of the whole structure is higher, and the configuration and the use in the actual production field are more convenient.

The image acquisition device comprises an industrial camera and a plurality of optical lenses.

The type of the exposure light source comprises one or more of an outer coaxial light source, a backlight light source, a point light source and an annular light source; the industrial camera includes a number of CCD cameras. The type of the exposure light source can be correspondingly set by matching with the CCD camera.

The exposure light source comprises one or more of an LED light source, a fluorescent light source or a halogen lamp.

In practical application, when one exposure light source or one type of exposure light source is difficult to meet actual detection requirements, the exposure light source can be correspondingly set according to specific application requirements of the image vision alignment system, more than one exposure light source is provided, the type selection of each exposure light source can be the same or different, and the method is favorable for better matching with the image acquisition equipment to capture high-quality images and improving detection precision. The plurality of exposure light sources can be controlled by one PLC controller in a unified manner or one exposure light source is connected with a single PLC controller for brightness control, and can be set correspondingly according to actual application conditions, without limitation.

Compared with the prior art, the invention has the main beneficial effects that:

1. the image multiple exposure method has simple steps and is convenient to implement, and the exposure brightness meeting the detection precision can be quickly obtained by presetting the first exposure brightness matched with the light reflection rate of the light receiving surface of the current object to be detected, so that the limitation of the exposure time on shortening the beat time is broken through; the requirement for diversification of the product to be detected in the actual production can be better met by manually setting the second exposure brightness; the exposure brightness can be freely and flexibly switched, and the defect of depending on the exposure time in the conventional method is thoroughly avoided.

2. The invention relates to an image vision alignment device, wherein a light source control module comprises a light source adapter and a programmable control module; the programmable control module switches the output of the light source brightness adjusting channel, so that the exposure brightness can be changed to meet the brightness requirements of different exposures of the image acquisition equipment in the alignment detection work of products in different forms.

3. The exposure brightness can be changed externally and mechanically through the light source control module, the exposure is more stable, and the requirement of multiple exposure is better met; the time for reaching the exposure requirement is mechanical switching time, the required time is short, and the problems that the sensor is overheated due to long-time exposure, the generated noise is increased, and the image quality is influenced are solved.

4. The exposure can be switched fast and feasible, the image is not easy to distort, the image capturing precision is not influenced, the beat time is not increased, and the detection efficiency is improved.

5. In addition, the control unit is convenient to expand, can further meet the diversity requirement of multiple exposure of the image, and is favorable for improving the detection quality and optimizing the detection process; the control unit controls the intermediate relay to switch different outputs, so that the exposure brightness is switched flexibly and is convenient to operate.

Drawings

Fig. 1 is a schematic view of an image vision alignment system according to a first embodiment of the present invention.

Fig. 2 is a schematic view of an image visual alignment apparatus according to a first embodiment of the invention.

Fig. 3 is a signal flow diagram of an image visual alignment apparatus according to a first embodiment of the invention.

Fig. 4 is a schematic view of an image visual alignment apparatus according to a second embodiment of the present invention.

FIG. 5 is a process diagram of a multi-exposure method according to a third embodiment of the present invention.

Fig. 6 is a schematic diagram of an electric power-on principle of an intermediate relay according to a third embodiment of the present invention.

Detailed Description

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings. In the figures, parts of the same structure or function are denoted by the same reference numerals, and not all parts shown are denoted by the associated reference numerals in all figures for reasons of clarity of presentation.

Example one

In the first embodiment of the present invention, as shown in fig. 1, the image vision alignment system of the present embodiment can simultaneously carry more than two products with different forms for detection, in fig. 1, an object i and an object ii with different forms are taken as an indication, the light transmittances of the object i and the object ii are different, and the required exposure is indicated as the exposure i and the exposure ii, respectively. In practical applications, the visual alignment system can carry only one object at a time to perform alignment test, or carry more objects simultaneously to perform alignment test, without limitation.

As shown in fig. 1, the image vision alignment apparatus of the present embodiment is composed of an upper computer, a light source control module 1 and an image capturing module 2. The image capturing module 2 of the present embodiment is electrically connected to an upper computer (not shown) and the light source control module 1 respectively to realize mutual communication. In some embodiments, the communication is via digital signals, but is not limited. The light source control module 1 may be integrated with the image capturing module 2 by combining with the layout of the application site or remotely control the image capturing module 2, which is not limited. In some embodiments, the image visual alignment apparatus may further include, but is not limited to, an independent power supply module, other modules, or several housings for integrating the modules. The exemplary light source control module 1 is provided with two light source adapters and one programmable control module. The image capturing module 2 of the present embodiment is composed of an image capturing device and an external exposure light source. The light source adapter comprises a light source brightness adjusting channel which is electrically connected with the exposure light source through the programmable control module respectively. The programmable control module responds to an exposure brightness requirement instruction of the upper computer to switch a channel of the light source adapter and outputs an electric signal to control the exposure brightness. As shown in fig. 2, the programmable control module of the present embodiment is composed of a control unit and a line switch unit. In other embodiments, the programmable control module may further include, but is not limited to, a signal detection unit, a memory unit, and the like. The control unit of this embodiment is an IO (input/output) control module. In some embodiments, the control unit may include other electrical modules besides the IO control module, and is not limited. The line switching unit comprises two intermediate relays, which are illustrated in fig. 2 as intermediate relay a and intermediate relay B. The number of the intermediate relays is the same as that of the light source brightness adjusting channels of the present embodiment. The two intermediate relays and the dual-channel light source adapter are illustrated for convenience of description, the number of the intermediate relays in practical application may be more, the light source adapter may have more light source brightness adjusting channels, or the number of the light source brightness adjusting channels is greater than that of the intermediate relays, and is not limited. In addition, in some implementation cases, the line switch unit may further include a plurality of small relays and ac contactors, and the line switch unit according with practical application may be correspondingly arranged according to the specific current and the circuit structure, without limitation. In this embodiment, all the light source brightness adjusting channels are correspondingly connected to one exposure light source, and the brightness of the exposure light source is adjusted to realize adaptive change of the exposure brightness. In some embodiments, the image capturing module 2 may further include a display device for displaying image information obtained currently, and other components, which are not limited. The image capturing device of this embodiment includes an industrial camera and a plurality of optical lenses, and in some implementation cases, may further include other optical elements for adjusting the light path direction by combining with a specific structural design layout, such as a reflective mirror, and is not limited. As shown in fig. 2, the industrial camera of the present embodiment is a CCD camera, but is not limited to a CMOS camera. Several optical lenses are arranged according to the alignment optical path, not shown in fig. 2. The industrial camera may have only one or more cameras, and is set correspondingly according to practical application requirements, and is not limited. The exposure light source of the embodiment adopts an LED light source, and is an annular light source. The type of the illumination mode of the exposure light source may be one or more of an external coaxial light source, a backlight light source, and a point light source, and may also be a fluorescent light source or a halogen lamp with different illuminants, without limitation. The exposure light source can be matched with the corresponding setting of the CCD camera, for example, the type selection and the setting of the exposure light source are carried out according to the photosensitive area, the shooting angle and the like of the CCD camera. In a preferred embodiment of the present invention, two CCD cameras share one exposure light source for multiple exposures, or more CCD cameras share one exposure light source, without limitation. In another way of this embodiment, a plurality of exposure light sources are provided, and the light source brightness adjusting channels are connected with the exposure light sources in a one-to-one correspondence manner. The brightness of the corresponding exposure light source is set through the light source brightness adjusting channel, and different exposure brightness is provided by different exposure light sources to realize the adaptive change of the exposure brightness. The programmable control module is realized by adopting a PLC (programmable logic controller), and the PLC is connected with the exposure light sources in a one-to-one correspondence manner. The integration level of the programmable control module is higher, and the programmable control module is convenient for field configuration to be put into use. The exemplary control method of the PLC controller of this embodiment may include: 1) The on-off control signal is output by outputting the switching value, that is, the on-off control signal is output, for example, whether a coil of the alternating current contactor is electrified or not is controlled by controlling the on-off of a small relay, so that the on-off of a main circuit connected with the contactor is controlled. 2) The signals are input to a light source adapter on site to be controlled by outputting analog signals, such as 0-20mA, 4-20mA or 0-5V, 0-10V and the like, such as a switch of a pneumatic valve with an electronic positioner and the like. 3) Through outputting digital signals, the control is carried out by connecting the communication line with a light source adapter on site, for example, the frequency converter is connected through an RS485 communication interface, and then the frequency converter can be directly controlled through the PLC controller by setting communication parameters, so that the site driving power supply is controlled.

In the present embodiment, the exposure brightness requirement command corresponds to a brightness setting value of the exposure light source. In the present embodiment, as shown in fig. 3, the host computer is configured to set and issue an exposure luminance requirement instruction for exposure one and exposure two different in requirements with reference to fig. 1. The brightness setting value is realized by dimming signals OUTPUT1 and OUTPUT2 OUTPUT by the two light source brightness adjusting channels. And the control unit receives the exposure brightness requirement instruction and correspondingly outputs a signal I and a signal II through an IO channel. In this embodiment, when receiving a signal one from an IO channel of the control unit, the intermediate relay B is powered on, and the exposure light source realizes a light source brightness exposure to meet exposure one by OUTPUT1 OUTPUT; when a signal two is received from the other IO channel of the control unit, the intermediate relay A is electrified, and the exposure light source is OUTPUT by OUTPUT2 to realize the light source brightness exposure so as to meet the exposure two. It should be noted that the number of the IO channels of the control unit is not less than the number of the light source brightness adjusting channels, and may be two or more, and the number is not limited according to how many different brightness setting values are set correspondingly in actual needs. In some implementations, the control unit is only provided with two IO channels to output two different control signals for adjusting the exposure brightness increase and decrease respectively. Dimming signals OUTPUT1 and OUTPUT2 or more signals OUTPUT by the light source adapter respectively correspond to brightness values from low to high, and when exposure brightness does not obtain a clear set value in actual detection work, an operator can gradually adjust the exposure brightness through switching of control signals until brightness meeting exposure requirements is obtained.

Example two

As shown in fig. 4, the second embodiment differs from the first embodiment mainly in that a plurality of light source adapters are connected to the same power supply through a serial line. An exemplary power supply is a 220 volt power supply. The exemplary control units are multiple and are arranged in one-to-one correspondence with the light source adapters. The control unit of this embodiment is still exemplified by one IO control module, and a port of each IO control module is connected to the upper computer through a serial line. In some implementations, the control unit may include a remote IO module, and is connected to the upper computer for remote communication, without limitation. The control unit and the light source adapter can be expanded and arranged according to specific requirements in the application of an actual image vision alignment system and can be implemented by the same upper computer. The control unit OUTPUTs signals one to n, and controls the light source adapter to realize exposure of n kinds of brightness by OUTPUT1 to OUTPUT. The light source adapter of the embodiment can increase the brightness step by step according to different requirements, such as the requirement of output voltage for selecting 5V, 12V, 24V and 28V, the control mode of the example can be manual, software and manual, and one path, two paths, three paths and four paths are correspondingly switched on according to the requirement of an output channel to correspondingly select.

EXAMPLE III

The present embodiment is exemplified by combining the first embodiment and the second embodiment with the image multiple exposure method of the present invention, and the exemplary method can be implemented by using the image vision alignment apparatuses of the first embodiment and the second embodiment.

As shown in fig. 5, an exemplary image multiple exposure method includes: presetting a plurality of first exposure brightness based on the light reflection rate of the light receiving surfaces of the objects to be detected; setting a current exposure brightness requirement instruction in an upper computer based on the first exposure brightness; and controlling the exposure brightness to expose the object to be detected based on the current exposure brightness requirement instruction. In a specific example, the method for presetting the plurality of first exposure brightnesses based on the light reflection rates of the light receiving surfaces of the plurality of objects to be measured includes: (1) And obtaining the light reflection rates of the light receiving surfaces of the ten objects to be tested according to ten products which are conventionally tested in actual test work. The reflectance may be obtained by optical measurement or from a parameter table of the inspected product, and is not limited in particular. The number of products for routine testing may be more than ten, or less, and is not limited to the number of products for routine testing selected according to a particular test job task or production plan. (2) And setting the ten first exposure brightness to be negatively correlated with the light reflection rates of the ten light receiving surfaces of the object to be detected. For example, the light reflectivities of ten light receiving surfaces of the object to be measured are respectively increased and correspondingly decreased, and the set ten first exposure luminances are set one by one, so that the first exposure luminances are matched with the light reflectivities of the light receiving surfaces of the object to be measured. Through switching different first exposure luminance, need not adjust image acquisition equipment's exposure time can implement multiple exposure to different products in the test work, can satisfy the detection precision demand and can improve efficiency of software testing again, can further shorten takt time.

In some specific examples, the method for setting the current exposure demand instruction in the upper computer includes: and providing a control in the upper computer. The control may be a button, a dialog box, etc. of the upper computer operation interface, and is not limited. The control includes a plurality of options and an input box. The plurality of options take the form of a drop down list, each option in the list having a value corresponding to a plurality of first exposure intensities. The input box is used for manually inputting the second exposure brightness. In actual work, if the object to be tested is a conventional test product, selecting options from a pull-down list to set a current exposure demand instruction; if the object to be tested is a product in a specific test work, the value can be manually input in the input box to set the current exposure requirement instruction, and the method is not limited. The operator can conveniently set the current exposure requirement instruction to provide the matched exposure brightness through providing the control, and the exposure and the image taking are carried out.

In some preferred examples, the image multiple exposure method further includes setting a second exposure brightness based on the light reflection rate of the light receiving surface of the current object to be measured, and setting the current exposure requirement command based on the second exposure brightness.

In one example, the method for controlling the exposure brightness based on the current exposure brightness requirement instruction comprises the following steps: when the upper computer sends different exposure brightness requirement instructions, different intermediate relays are powered on; the current exposure brightness is set by controlling different intermediate relays to be electrified.

Two kinds of controls are provided in the upper computer software, the first kind is an automatic exposure control, a user selects a preset first exposure brightness, as shown in fig. 6, for example, exposure 1 automatic M4009, exposure 2 automatic M4011 and the like can be more and are not limited, the user SETs (SET) a current exposure brightness requirement instruction, for example, exposure 1 of M2500, exposure 2 of M2501 and the like, and correspondingly controls different intermediate relays to be powered according to the SET current exposure brightness requirement instruction, for example, if exposure 1 of M2500 is SET, then intermediate relay 1 of Y300 is powered, and if exposure 2 of M2501 is SET, then intermediate relay 2 of Y301 is powered. The codes M4009, Y301, and the like in the above example may be customized according to actual applications, are not limited to the form of the codes, may be formed by any other letters or numbers, and may be freely set. In an exemplary case, the code head is M (for example, M4009) as an input command switch (in the embodiment, collectively referred to as an input command), and the code head is Y (for example, Y301) as an output command (the output command corresponds to power on for realizing exposure, such as a power on pull-in command of a relay). Different intermediate relays are connected with different exposure light sources; and controlling different intermediate relays to be electrified so as to lighten corresponding exposure light sources to obtain the current exposure brightness. The current and voltage are changed through upper computer software, so that the current exposure brightness is changed to realize the matching of the brightness change and the light reflection rate of the illuminated surface of the object to be detected, and the detection precision requirement is met. In the illustrated case, the user may also manually set the second exposure brightness, i.e., exposure 1 manual M4008, exposure 2 manual M4010, etc., which may be more or less limited. The upper computer software distinguishes whether the current exposure 1 or 2 set by automatic exposure or the exposure 1 or 2 set by manual exposure through 'negation' processing.

For clarity of description, the use of certain conventional and specific terms and phrases is intended to be illustrative and not restrictive, but rather to limit the scope of the invention to the particular letter and translation thereof. The present invention has been described in detail, and the structure and operation principle of the present invention are explained by applying specific embodiments, and the description of the embodiments is only used to help understanding the method and the core idea of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A method for multiple exposure of an image, comprising: the method comprises the following steps: presetting a plurality of first exposure brightness based on the light reflection rate of the light receiving surfaces of the objects to be detected; setting a current exposure brightness demand instruction in an upper computer based on the first exposure brightness; and controlling the exposure brightness to expose the object to be detected based on the current exposure brightness demand instruction.

2. The method of claim 1, wherein: the method for presetting a plurality of first exposure brightnesses based on the light reflection rates of the light receiving surfaces of a plurality of objects to be detected comprises the following steps: and acquiring the light reflection rates of the light receiving surfaces of the plurality of objects to be detected, and setting the plurality of first exposure brightnesses to be in negative correlation with the light reflection rates of the light receiving surfaces of the plurality of objects to be detected.

3. The method of claim 1, wherein: the method further comprises the steps of setting a second exposure brightness based on the light reflection rate of the light receiving surface of the current object to be detected, and setting the current exposure demand instruction in the upper computer based on the second exposure brightness.

4. The image multiple exposure method of claim 3, wherein: the method for setting the current exposure demand instruction in the upper computer comprises the following steps: providing a control in the upper computer, wherein the control comprises a plurality of options and an input box; the options correspond to the first exposure brightness one by one, and the input box is used for inputting the second exposure brightness; and selecting the option to set a current exposure requirement instruction or inputting a numerical value in an input frame to set the current exposure requirement instruction.

5. The method according to any one of claims 1 to 4, wherein: the method for controlling the exposure brightness based on the current exposure brightness demand instruction comprises the following steps: when the upper computer sends different exposure brightness requirement instructions, different intermediate relays are powered on; the current exposure brightness is set by controlling different intermediate relays to be electrified.

6. The image multiple exposure method of claim 5, wherein: the different intermediate relays are connected with different exposure light sources; and controlling different intermediate relays to be electrified so as to lighten corresponding exposure light sources to obtain the current exposure brightness.

7. An image vision alignment device comprises an upper computer, a light source control module and an image capturing module which are communicated and connected with each other; the method is characterized in that: the image capturing module comprises at least one exposure light source and image acquisition equipment; the light source control module comprises a light source adapter and a programmable control module; the light source adapter comprises at least two light source brightness adjusting channels, and each light source brightness adjusting channel is electrically connected with the exposure light source through the programmable control module; and the programmable control module is in communication connection with the upper computer and is electrically connected with the exposure light source.

8. The visual image alignment device of claim 7, wherein: the programmable control module comprises a control unit and a line switch unit which are electrically connected; the circuit switch unit is also electrically connected with the light source brightness adjusting channel and the exposure light source respectively.

9. The visual image alignment device of claim 8, wherein: the circuit switch unit comprises at least two intermediate relays, and the number of the intermediate relays is consistent with that of the light source brightness adjusting channels; the control unit comprises an IO channel in communication connection with the upper computer; the IO channel is electrically connected with the intermediate relay, and the output signal controls whether the intermediate relay is attracted or not so as to switch on or off the corresponding light source brightness adjusting channel.

10. The visual image registration apparatus of any one of claims 7-9, wherein: the light source adapters are connected with the same power supply through serial lines to supply power; and the port of the control unit is electrically connected with the upper computer through a serial line.

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