CN115209136B - Time-sharing exposure detection method, system and device for line scanning camera and storage medium - Google Patents
Time-sharing exposure detection method, system and device for line scanning camera and storage medium Download PDFInfo
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- CN115209136B CN115209136B CN202211112062.2A CN202211112062A CN115209136B CN 115209136 B CN115209136 B CN 115209136B CN 202211112062 A CN202211112062 A CN 202211112062A CN 115209136 B CN115209136 B CN 115209136B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- G—PHYSICS
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- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
- G07C3/14—Quality control systems
- G07C3/146—Quality control systems during manufacturing process
Abstract
The application relates to a time-sharing exposure detection method, a time-sharing exposure detection system, a time-sharing exposure detection device and a time-sharing exposure detection storage medium for a line scanning camera, and relates to the technical field of appearance defect detection; it includes: the method comprises the steps that camera equipment and a plurality of light sources are installed in advance, the brightness value of each light source is set, and a product is placed in a preset placing area, wherein the irradiation areas of all the light sources cover the placing area, and the camera area of the camera equipment is contained in the placing area; receiving a detection signal and controlling a product to move along a specified track; controlling the camera equipment and all light sources to be triggered at the same frequency based on the preset frequency, and stopping triggering until the triggering frequency reaches the preset triggering frequency; acquiring a line scanning image, extracting pixels from the line scanning image at equal pixel intervals based on the pixel size of the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected. This application has the effect that alleviates intensity of labour, improves detection efficiency.
Description
Technical Field
The present disclosure relates to the field of appearance defect detection technologies, and in particular, to a method, a system, an apparatus, and a storage medium for time-sharing exposure detection of a line scan camera.
Background
Along with the consumer to the product quality requirement constantly improve, the producer not only will guarantee the functional effect of product when producing the product, more will carry out strict control to the outward appearance of product, consequently, the quality testing technique of product comes in step, and product quality testing includes product appearance defect and detects, generally adopts following detection mode to the quality testing of product at present: because some defects of the product can be found only under the irradiation of a light source with a specific angle and specific brightness, a quality inspector generally places the product on a storage platform (hereinafter, referred to as a storage area) first, then manually polishes the product from different angles and visually observes the outer surface of the product, and then detects the appearance defects of scratches, edge breakage, bulges, pits, bumps, cracks, dirt, water stains and the like on the surface of the product.
In view of the related art described above, the inventors have found that at least the following problems exist in the art: in the operation process, the products need to be polished by manual operation with light sources with different angles and different brightness, and when batch products need to be detected, the detection mode has high labor intensity and low detection efficiency, so the improvement is needed.
Disclosure of Invention
In order to solve the technical problems of high labor intensity and low detection efficiency of the existing detection operation on the appearance defects of products, the application provides a time-sharing exposure detection method, a time-sharing exposure detection system, a time-sharing exposure detection device and a time-sharing exposure detection storage medium for a line scanning camera.
In a first aspect, the application provides a time-sharing exposure detection method for a line scan camera, which adopts the following technical scheme:
a time-sharing exposure detection method for a line scan camera comprises the following steps: the method comprises the steps that camera equipment and a plurality of light sources are installed in advance, the brightness value of each light source is set, and a product is placed in a preset placing area, wherein the irradiation areas of all the light sources cover the placing area, and the camera area of the camera equipment is contained in the placing area; further comprising:
receiving a detection signal, and controlling the product to move along a specified track, wherein the specified track refers to a path corresponding to the product when the product completely passes through the camera shooting area;
controlling the camera device and all the light sources to be triggered at the same frequency based on a preset frequency, and stopping triggering until the triggering frequency reaches the preset triggering frequency;
acquiring a line scanning image, extracting pixels from the line scanning image at intervals based on the actual size of a product in the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected; wherein the line scan image refers to an image captured each time the image capturing apparatus is triggered.
By adopting the technical scheme, the camera shooting equipment, the lens and the light source are arranged on the object placing area in advance, parameters of the camera shooting equipment are adjusted, and the light emitting angle and the light source brightness of the light source are optimized to enable the camera shooting equipment, the lens and the light source to be in the best image capturing effect state; setting corresponding parameters such as line frequency, exposure, gain and the like based on the actual length and width of the shot product; the detection signal is a trigger condition for controlling the movement of a product, only when the detection signal is received, the product can be controlled to move, a series of operations such as line scanning shooting and the like are carried out on the product, the detection signal can be generated by manual triggering when an operator puts the product into an object placing area, or the detection signal can be generated by external detection equipment after the product is detected to enter the object placing area, then the product is controlled to move according to an appointed track, so that the product can completely pass through an image pick-up area in the moving process, then the image pick-up equipment and a light source are controlled to carry out simultaneous same-frequency triggering for a plurality of times according to a preset frequency, a line scanning image shot by the image pick-up equipment can be obtained by triggering each time, the line scanning image is extracted according to a specific extraction mode to obtain a plurality of images to be detected, the images to be detected are output and displayed, automatic polishing and shooting of the whole product are realized through the method, the labor intensity is reduced, and the detection efficiency is improved.
Preferably, the imaging region includes two imaging boundary lines; the controlling the product to move along a designated track comprises the following steps:
acquiring an initial region of the product, wherein the initial region refers to a position of the product in a storage region before the product is moved;
if the initial region and the shooting region have overlapped parts and all the shooting boundary lines do not have overlapped parts with the initial region, generating a trigger instruction and determining the trigger instruction as a first trigger instruction;
if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction;
the controlling the camera device and all the light sources to simultaneously trigger at the same frequency based on the preset frequency until the triggering frequency reaches the preset triggering frequency comprises the following steps:
if the trigger instruction is a first trigger instruction, controlling the camera equipment and all the light sources to simultaneously trigger once at the same frequency according to a preset frequency and then stopping;
and if the trigger instruction is a second trigger instruction, controlling the camera equipment and all the light sources to simultaneously trigger at the same frequency according to a preset frequency, and stopping until the triggering frequency reaches the preset triggering frequency.
Through adopting above-mentioned technical scheme, if the initial zone of product and the regional coincidence of making a video recording, and not with the boundary line coincidence of making a video recording, then the product is located the regional of making a video recording completely just before not moving, so the product need not to remove this moment, can directly trigger camera equipment and all light sources and make a video recording of polishing, and only need trigger once and can shoot and obtain complete product image, optimize energy-conserving effect.
Preferably, the designated track includes a moving direction and a total moving length, the moving direction refers to a direction in which the product completely passes through the image pickup area, and the total moving length refers to a corresponding stroke when the product completely passes through the image pickup area; if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction, wherein the method comprises the following steps of:
if the initial region and the shooting region have an overlapped part, a first shooting boundary line with the overlapped part of the initial region and a second shooting boundary line which is not overlapped with the initial region exist, determining the direction of the second shooting boundary line relative to the first shooting boundary line as a moving direction, determining the maximum distance between the initial region and the first shooting boundary line as a total moving length, generating a trigger instruction, determining the trigger instruction as a second trigger instruction, and controlling the product to move along the moving direction until a moving stroke reaches the total moving length and then stopping moving.
By adopting the technical scheme, the situation is that a part of area of the product before movement is located in the camera shooting area, at the moment, the movement direction of the product can be determined according to the position of the product relative to the camera shooting boundary line, and the total movement length of the product is determined according to the distance between the initial area and the camera shooting area, so that the product can completely pass through the camera shooting area, and further the camera shooting area can be ensured to shoot to obtain a complete product image in the product movement process.
Preferably, if the initial region does not overlap with the imaging region or there is an imaging boundary line overlapping with the initial region, the method controls the product to move along a specified track, generates a trigger instruction, and determines the trigger instruction as a second trigger instruction, further includes:
if the initial region does not coincide with the image pickup region, determining an image pickup boundary line closest to the initial region as a third image pickup boundary line, and determining an image pickup boundary line farthest from the initial region as a fourth image pickup boundary line;
and determining the direction of the fourth shooting boundary line relative to the third shooting boundary line as a moving direction, determining the maximum distance between the initial area and the third shooting boundary line as the total moving length, generating a trigger instruction, determining the trigger instruction as a second trigger instruction, and controlling the product to move along the moving direction until the moving stroke reaches the total moving length.
By adopting the technical scheme, the situation is that the product before moving is completely positioned at the periphery of the camera shooting area, at the moment, the moving direction of the product is determined according to the position of the product relative to the camera shooting boundary line, and then the total moving length of the product is determined according to the distance between the initial area and the camera shooting area, so that the automatic control of the product moving is realized, the product can completely pass through the camera shooting area, and the camera shooting area can be ensured to shoot a complete product image in the product moving process.
Preferably, if the trigger instruction is a second trigger instruction, controlling the image pickup apparatus and all the light sources to simultaneously trigger at the same frequency according to a preset frequency, and stopping triggering until the triggering frequency reaches a preset triggering frequency, including:
if the trigger instruction is a second trigger instruction, determining the minimum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as a minimum stroke, and determining the maximum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as a maximum stroke;
determining the initial triggering edge = the minimum stroke/a preset moving speed based on the maximum stroke and the minimum stroke, and determining the total triggering times = (the maximum stroke-the minimum stroke)/the distance between two shooting boundary lines;
controlling the camera shooting equipment and all light sources to trigger until the actual triggering times of the camera shooting equipment and all light sources reach the total triggering times; the initial triggering time edge refers to a corresponding time length from the time when the product starts to move to the time when the image pickup device is triggered for the first time, and the triggering time of the image pickup device and all the light sources is = the time when the product starts to move + the initial triggering time edge.
By adopting the technical scheme, in order to reduce the occupation ratio of parts except products in the line scanning image and further improve the energy-saving effect of the camera shooting device and the light source, the scheme is adopted to determine the triggering time of the camera shooting device and the light source and the triggering frequency based on the total moving length and the moving position of the products, so that the triggering of the camera shooting device and the light source is started only when the products fill the camera shooting area, and the triggering is stopped after the products completely enter or pass through the camera shooting area.
Preferably, if the initial region does not overlap with the imaging region or an imaging boundary line overlapping with the initial region exists, the controlling the product to move along a specified track to generate a trigger instruction, and determining the trigger instruction as a second trigger instruction includes:
and if the initial region and the shooting region have overlapped parts, all shooting boundary lines have overlapped parts with the initial region, and the area of the initial region is equal to that of the overlapped parts, generating a trigger instruction, and determining the trigger instruction as a first trigger instruction.
By adopting the technical scheme, the size of the product can be just coincided with the shooting area under the condition that the condition indicates that the product does not exist outside the shooting area, the product does not need to be controlled to move under the condition, and only a first trigger instruction needs to be sent to trigger the shooting equipment and the light source once.
Preferably, if the initial region does not overlap with the imaging region or there is an imaging boundary line overlapping with the initial region, the method controls the product to move along a specified track, generates a trigger instruction, and determines the trigger instruction as a second trigger instruction, further includes:
and if the initial region and the shooting region have overlapped parts, all shooting boundary lines and the initial region have overlapped parts, and the area of the initial region is larger than that of the overlapped parts, generating and displaying early warning information.
By adopting the technical scheme, the condition shows that the state of the product relative to the camera shooting area can be as follows: if the number of the subareas which are not overlapped with the shooting area is more than 1, the shooting equipment cannot shoot a complete product image by one-way movement of the product at the moment, and early warning information is displayed to inform an operator to readjust the position of the product.
In a second aspect, the present application provides a time-sharing exposure detection system for a line scan camera, including:
the product moving module is used for receiving a detection signal and controlling the product to move along a specified track, wherein the specified track refers to a path corresponding to the product when the product completely passes through the camera shooting area;
the trigger control module is used for controlling the camera shooting equipment and all the light sources to be simultaneously triggered at the same frequency based on a preset frequency, and stopping triggering until the triggering frequency reaches the preset triggering frequency;
the image acquisition processing module is used for acquiring a line scanning image, extracting pixels from the line scanning image at intervals based on the actual size of a product in the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected; wherein the line scan image refers to an image captured each time the image capturing apparatus is triggered.
In a third aspect, the present application provides a detection control apparatus, comprising a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute the method according to any one of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium, which is characterized by a computer program that can be loaded by a processor and execute the method according to any one of the first aspect.
To sum up, the application comprises the following beneficial technical effects:
the method of combining the line scanning camera and the time-sharing exposure is adopted, so that the response of the camera is greatly improved, the noise is reduced, and the brightness and the quality of the image are improved. The time-sharing exposure is matched with the multi-angle stroboscopic light source, so that up to four light sources can be responded at the same time, a complete image is output at one time, and four images with different brightness are generated through pixel extraction and are used for detecting appearance defects of different types. Under the condition of not changing the quantity of detection items, the equipment stations and the use amount are saved, and the detection efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a usage scenario for embodying a time-sharing exposure detection method of a line scan camera in an embodiment.
FIG. 2 is a schematic flowchart illustrating a time-sharing exposure detection method for a line scan camera according to an embodiment.
Fig. 3 is a schematic diagram for embodying a positional relationship between the product initial region and the imaging region in the embodiment.
FIG. 4 is a schematic diagram of an embodiment of an extraction method for extracting a scanned image to obtain an image to be detected.
FIG. 5 is a block diagram of a time-sharing exposure detection system for a line scan camera according to an embodiment.
Description of the reference numerals: 11. placing an object area; 22. producing a product; 33. an image pickup apparatus; 44. a light source; 55. a camera area; 6. a product moving module; 7. a trigger control module; 8. and the image acquisition processing module.
Detailed Description
The embodiment of the application discloses a time-sharing exposure detection method for a line scan camera, which is mainly used for detecting appearance defects of a product 22, and is suitable for, but not limited to, scenes shown in fig. 1. As can be seen from fig. 1, the product 22 is placed in the object placing area 11, the image capturing device 33 and the plurality of light sources 44 are further installed above the object placing area 11, the image capturing device 33 in this application is a line scan camera, the image capturing device 33 can capture an image of the entire width range of the object placing area 11, and an area indicated by a dotted line portion in the object placing area 11 is an image capturing area 55. The number of the light sources 44 equipped in the embodiment of the present application is 4, the light sources 44 specifically can be linear light sources 44, the irradiation range of the light sources 44 covers the whole object placing area 11, all the light sources 44 of the present application are arranged in an arch shape, and the brightness of the light sources 44 is different from each other, so as to realize the polishing effect on the products 22 at different angles and at different brightness. The storage area 11 is further provided with a module (not shown) for controlling the product 22 to move along the length direction of the storage area 11, so that the product 22 can completely pass through the camera area 55 during the movement.
The detection method provided by the application is used for controlling the mold to drive the product 22 to move, and when the product 22 moves into the camera area 55, the camera device 33 and all the light sources 44 are controlled to be triggered for a preset triggering time at the same time, so that the camera device 33 can obtain line scanning images representing all parts of the product 22 after being triggered for multiple times, then a plurality of images to be detected are obtained by extracting the line scanning images obtained every time, and all the images to be detected are displayed, so that quality inspectors can analyze the appearance defects of the product 22 according to the images to be detected.
The main implementation of the detection method proposed in the present application is a detection control device, which is assisted by the camera device 33, the light source 44 and the module. The camera device 33 is internally integrated with an internationally advanced global shutter CMOS image sensor and a large-scale field programmable gate array parallel processor, and outputs data to the detection control device through a high-speed industrial Camera Link bus, and meanwhile, the camera device 33 also has the characteristics of high speed, high sensitivity and low noise. The module can be a combination structure of a pneumatic sliding table or a motor screw rod or other structures capable of driving the product 22 to move along the length direction of the storage area 11. The camera device 33, the light source 44 and the mold are all in communication connection with the detection control device so as to control the opening and closing of the camera device 33, the light source 44 and the module through the detection control device. In addition, the detection control device can realize the trigger control of the image pickup device 33 and all the light sources 44 through the same trigger, and ensures that the image pickup device 33 and all the light sources 44 can be triggered at the same time and at the same frequency. The detection control device also prestores brightness parameters of the light sources 44, so that all the light sources 44 are adjusted to the brightness of the corresponding light sources 44 before operation, and the brightness of all the light sources 44 is ensured to be different.
The main operation flow of the above detection method will be described in detail with reference to fig. 1 and 2, and the following contents are as follows:
in implementation, the detection signal is a trigger condition when the detection control device control module drives the product 22 to start, and the detection control device controls the product 22 to move only when the detection control device obtains the detection signal; the detection signal may be a signal generated by manual triggering after the product 22 is placed in the placement area 11 by the quality testing person, for example, a trigger button electrically connected to the detection control device is arranged near the placement area 11, and when the quality testing person touches the trigger button, the detection control device receives the signal sent by the trigger button, and the signal is a detection signal; alternatively, a component such as a load cell may be provided below the storage area 11, and the presence or absence of the product 22 on the storage area 11 may be determined by detecting the weight data, and if the weight data exceeds a predetermined weight value, the detection control device may generate the detection signal.
When the detection control device obtains the detection signal, the detection control device controls the product 22 to move, and the specific moving mode of the product 22 needs to be determined according to the initial position of the product 22 on the storage area 11, which is specifically divided into the following cases, and different cases correspond to different control operations, and each case will be explained in the following with reference to fig. 3.
Case one is as follows:
the image pickup area 55 includes two image pickup boundary lines, and the step 101 of "controlling the product to move along the designated track" specifically includes:
step 1011, acquiring an initial region of the product 22, wherein the initial region refers to a position where the product 22 is located in the placement area 11 before moving;
step 1012, if there is an overlapping portion between the initial region and the image capturing region 55 and there is no overlapping portion between all image capturing boundary lines and the initial region, generating a trigger instruction, and determining the trigger instruction as a first trigger instruction;
step 1013, if the initial region does not overlap with the image capturing region 55 or there is an image capturing boundary line overlapping with the initial region, the control product 22 moves along the specified trajectory to generate a trigger instruction, and the trigger instruction is determined as a second trigger instruction.
In an implementation, the detection control device may be further electrically connected to a positioning device, the positioning device may specifically be a camera, the positioning device may capture a picture of the entire object area 11, and the detection control device establishes a two-dimensional coordinate system by receiving the position image captured by the positioning device, taking a bottom boundary line of the position image as an abscissa, taking a leftmost boundary line of the position image as an ordinate, taking an intersection point of the bottom boundary line and the leftmost boundary line as an origin (as shown in fig. 1), performs equal-interval segmentation on the position image, determines a position of the product 22 in the position image, and determines the position image as an initial area of the product 22, that is, a position of the object area 11 before the product 22 is not moved; correspondingly, the serial numbers of the four light sources in fig. 1 are 1, 2, 3 and 4 in sequence in the direction away from the origin of the module coordinate.
After the initial region of the product 22 is determined, the detection control device determines whether or not there is an overlapping portion between the initial region and the imaging region 55, specifically by: the range of the imaging region 55 in the position image is stored in the detection control device in the form of two-dimensional coordinates, and at this time, the detection control device only needs to determine the abscissa interval of the initial region, and then compares the abscissa interval corresponding to the initial region with the abscissa interval corresponding to the imaging region 55 to determine whether there is a superposed portion between the initial region and the imaging region 55.
The image pickup boundary line is a boundary line of the image pickup area 55, the length direction of the image pickup boundary line is parallel to the width direction of the object placing area 11, and the image pickup area 55 is an area enclosed by two image pickup boundary lines and two long sides of the object placing area 11; similarly, the determination method of whether the image capturing boundary line overlaps the initial region specifically includes: and determining whether the abscissa corresponding to the shooting boundary line is positioned in the abscissa interval corresponding to the initial region, and if so, indicating that the initial region is overlapped with the shooting boundary line.
The positional relationship of the initial region of the product 22 relative to the imaging region 55, as indicated by step 1012, is as shown in the first case of fig. 3, i.e., the product 22 is completely within the initial region, and there is no need to move the product 22.
Optionally, the second case is as follows:
step 1012 specifically includes:
if there is an overlapping portion between the initial region and the image pickup region 55, and there is an overlapping portion between all the image pickup boundary lines and the initial region, and the area of the initial region is equal to the area of the overlapping portion, a trigger instruction is generated, and the trigger instruction is determined as the first trigger instruction.
In implementation, the positioning image is specifically composed of a plurality of cells, and the side length of each cell is the length of a unit coordinate, so that the detection control device can determine the area of an initial region and the area of a superposed part by calculating the number of the cells; as can be seen from the diagram corresponding to the second case in fig. 3, the second case shows that the product 22 is completely located in the imaging area 55, and there is no portion located at the periphery of the imaging area 55, and in the same way, the detection control device does not need to control the product 22 to move.
Optionally, case three is as follows:
the designated track comprises a moving direction and a total moving length, the moving direction refers to the direction in which the product 22 moves through the camera area 55, and the total moving length refers to a corresponding stroke when the product 22 completely passes through the camera area 55;
step 1012 specifically includes:
if the initial region and the imaging region 55 have an overlapped portion, a first imaging boundary line having an overlapped portion with the initial region and a second imaging boundary line not overlapping with the initial region exist, the direction of the second imaging boundary line relative to the first imaging boundary line is determined as a moving direction, the maximum distance between the initial region and the first imaging boundary line is determined as the total moving length, a trigger instruction is generated, the trigger instruction is determined as a second trigger instruction, and the product 22 is controlled to move along the moving direction until the moving stroke reaches the total moving length and stop moving.
In implementation, referring to a diagram corresponding to the third case in fig. 3, the first imaging boundary line refers to an imaging boundary line where there is an overlapping portion with the initial region, and the second imaging boundary line refers to an imaging boundary line where there is no overlapping portion with the initial region; the moving direction is specifically the left direction and the right direction, the detection control device determines the moving direction by comparing the sizes of the abscissa corresponding to the second camera shooting boundary line and the first camera shooting boundary line, if the abscissa corresponding to the second camera shooting boundary line is larger than the abscissa corresponding to the first camera shooting boundary line, the moving direction is the right direction, otherwise, the moving direction is the left direction; the total length of movement refers to the shortest distance that the product 22 can completely enter and pass through the camera area 55 when the product 22 moves along the moving direction; after the moving direction and the total moving length are determined, the detection control device can control the product 22 to move along the determined moving direction, and the total moving stroke length is equal to the determined total moving length.
Optionally, the case four is as follows:
step 1012 specifically includes:
if the initial region does not overlap the imaging region 55, determining an imaging boundary line closest to the initial region as a third imaging boundary line, and determining an imaging boundary line farthest from the initial region as a fourth imaging boundary line;
and determining the direction of the fourth camera shooting boundary line relative to the third camera shooting boundary line as a moving direction, determining the maximum distance between the initial area and the third camera shooting boundary line as the total moving length, generating a trigger instruction, determining the trigger instruction as a second trigger instruction, and controlling the product 22 to move along the moving direction until the moving stroke reaches the total moving length.
In practice, as can be seen from the diagram corresponding to the fourth case in fig. 3, the product 22 in the fourth case is completely located at the periphery of the image pickup area 55, and since the image pickup area 55 can cover the whole width direction of the object area 11, the product 22 is necessarily located only at one side of the image pickup area 55, and then the detection control device determines the image pickup boundary line closest to the initial area as the third image pickup boundary line and determines the other image pickup boundary line as the fourth image pickup boundary line; the detection control device determines the moving direction by comparing the abscissa corresponding to the third photographing boundary line with the abscissa corresponding to the fourth photographing boundary line, and similarly, if the abscissa corresponding to the fourth photographing boundary line is larger than the abscissa corresponding to the third photographing boundary line, the detection control device determines the moving direction to be the right direction, otherwise, the moving direction is the left direction; the detection control means determines the maximum distance between the initial region and the third camera boundary line as the total movement length, and finally the detection control means controls the product 22 to move in the determined movement direction until the movement distance reaches the total movement length.
Optionally, case five is as follows:
step 1012 specifically includes:
if there is an overlapping portion between the initial region and the image pickup region 55, and there is an overlapping portion between all image pickup boundary lines and the initial region, and the area of the initial region is larger than that of the overlapping portion, the warning information is generated and displayed.
In implementation, as can be seen from the diagram corresponding to the fifth case in fig. 3, a part of the product 22 is located in the image capturing region 55, and parts that do not coincide with the image capturing region 55 are located on two sides of the image capturing region 55, at this time, the product 22 cannot pass through the image capturing region 55 by moving the product 22 in one direction alone, at this time, the detection control device may generate the warning information, and then the warning information is displayed by the display device connected to the detection control device in advance, and the specific content of the warning information may be "please readjust the product position".
And 102, controlling the camera device 33 and all the light sources 44 to simultaneously trigger at the same frequency based on a preset frequency, and stopping triggering until the triggering times reach the preset triggering times.
In implementation, during the movement of the product 22, the detection control device controls the camera device 33 and all the light sources 44 to be triggered at the same time and at the same frequency, and the triggering times and the triggering time are determined differently according to the above five cases, specifically, if the relative position relationship between the initial region of the product 22 and the camera region 55 is case one or case two, the detection control device generates a triggering instruction before controlling the movement of the product 22, and defines the triggering instruction as a first triggering instruction, and if the relative position relationship between the initial region of the product 22 and the camera region 55 is case three or case four, the detection control device generates a triggering instruction before controlling the movement of the product 22, and defines the triggering instruction as a second triggering instruction.
Accordingly, step 102 includes:
step 1021, if the trigger instruction is a first trigger instruction, controlling the camera device 33 and all the light sources 44 to simultaneously trigger once with the same frequency according to a preset frequency and then stop;
step 1022, if the trigger instruction is a second trigger instruction, controlling the camera device 33 and all the light sources 44 to simultaneously trigger at the same frequency according to the preset frequency, and stopping until the triggering frequency reaches the preset triggering frequency;
step 1022 specifically further includes:
if the trigger instruction is a second trigger instruction, determining the minimum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as the minimum stroke, and determining the maximum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as the maximum stroke;
determining initial triggering edge = minimum stroke/preset moving speed based on the maximum stroke and the minimum stroke, and determining total triggering times = (the maximum stroke-the minimum stroke)/a distance between two shooting boundary lines;
controlling the image pickup device 33 and all the light sources 44 to trigger until the actual trigger times of the image pickup device 33 and all the light sources 44 reach the total trigger times; the initial triggering edge refers to a corresponding time length from when the product 22 starts to move to when the camera device 33 is triggered for the first time, and the triggering time of the camera device 33 and all the light sources 44 = time when the product 22 starts to move + the initial triggering edge.
In implementation, in order to achieve the energy saving effect and ensure that a complete image of the product 22 is captured with the minimum number of triggers, the number of triggers and the trigger time may be determined by combining the above five cases, where the trigger time = the time point when the product 22 starts to move + the trigger time edge; if the trigger instruction is the first trigger instruction, it indicates that the product 22 does not need to be moved, and at this time, the detection control device only needs to control the camera device 33 and all the light sources 44 to trigger once when receiving the trigger instruction; if the trigger instruction is the second trigger instruction, at this time, the detection control device needs to move the product 22 by a certain distance and then trigger the camera device 33 and all the light sources 44, a duration corresponding to the certain distance is a trigger time edge, and at this time, the total trigger time = (the maximum stroke — the minimum stroke)/a distance between two camera boundary lines, and in addition, the preset frequency = 1/a linear distance between two camera boundary lines/a moving speed of the product 22.
103, acquiring a line scanning image, extracting pixels from the line scanning image at intervals based on the actual size of a product in the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected; the line scan image refers to an image captured by the image pickup device 33 at each trigger.
In implementation, when the detection control device triggers the image pickup device 33 and the light source 44 each time, the image pickup device 33 will shoot a line scan image, after the detection control device receives the line scan image, the detection control device may intercept a line scan image containing only a product from the line scan image according to an actual size of the product and a preset image of the placement area 11, where the actual size of the product may be length and width information pre-stored in a database of the detection control device, the image of the placement area refers to an image shot by the image pickup device when no product is placed in the image pickup area, the detection control device may compare the line scan image with the image of the placement area, determine an area where the line scan image and the image of the placement area are inconsistent, and intercept the area to form the line scan image containing only the product.
Then, the detection control device extracts 4 images to be detected from the line scanning image after the interception according to the following modes: with reference to fig. 4, in the present application, when the image capturing apparatus 33 is triggered once, the corresponding shooting length is 4w lines of pixels, the detection control device numbers each line of pixels of the 4w lines of pixels according to the numbering sequence of 1, 2, 3, and 4, and then extracts and recombines the line pixels with the same number to obtain an image to be detected, where the specification of the image to be detected is 1w line of pixels, thereby completing the extraction operation of a single line scan image; in addition, in order to obtain a complete image of the product 22, the detection control device may stitch the images to be detected extracted at all trigger times, where the stitching rule is: and splicing the images to be detected with the same number according to the moving direction of the product 22 to finally obtain four images to be detected, and finally detecting the control device.
In summary, the time-sharing exposure detection method for the line scan camera disclosed by the application supports simultaneous detection of multiple light sources 44, adopts a line sweep frequency flash technology, efficiently outputs multiple line scan images at high frequency, and can divide each line scan image into quarters and extract the quarters to obtain the image to be detected, so that the labor intensity is reduced, and the detection efficiency is improved.
The embodiment of the application also discloses a line scanning camera time-sharing exposure detection system, referring to fig. 5, the detection system includes:
the product moving module 6 is configured to receive the detection signal and control the product 22 to move along a specified track, where the specified track refers to a path corresponding to the product when the product completely passes through the image pickup area;
the trigger control module 7 is configured to control the camera device 33 and all the light sources 44 to be triggered at the same frequency based on a preset frequency, and stop triggering until the triggering frequency reaches a preset triggering frequency;
the image processing module 8 is used for acquiring a line scanning image, extracting pixels from the line scanning image at equal pixel intervals based on the pixel size of a product in the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected; here, the line scan image refers to an image captured each time the image pickup apparatus 33 is triggered.
Optionally, the image capturing region 55 includes two image capturing boundary lines;
the product moving module 6 is further configured to obtain an initial region of the product 22, where the product 22 is located in the storage area 11 before moving; the trigger instruction is further used for generating a trigger instruction when the initial region and the image pickup region 55 have overlapped parts, and all image pickup boundary lines do not have overlapped parts with the initial region, and the trigger instruction is determined as a first trigger instruction; and the control device is further configured to control the product 22 to move along the specified trajectory, generate a trigger instruction, and determine the trigger instruction as a second trigger instruction when the initial region does not coincide with the imaging region 55 or an imaging boundary line that coincides with the initial region exists.
The trigger control module 7 is further configured to control the camera device 33 and all the light sources 44 to simultaneously trigger once with the same frequency according to a preset frequency and then stop triggering when the trigger instruction is the first trigger instruction; and when the trigger instruction is a second trigger instruction, controlling the camera device 33 and all the light sources 44 to simultaneously trigger at the same frequency according to the preset frequency, and stopping triggering until the triggering frequency reaches the preset triggering frequency.
Optionally, the designated trajectory includes a moving direction and a total moving length, the moving direction refers to a direction in which the product 22 completely passes through the camera area 55, and the total moving length refers to a corresponding stroke when the product 22 completely passes through the camera area 55;
the product moving module 6 is further configured to, when there is an overlapping portion between the initial region and the image pickup region 55, and there is a first image pickup boundary line having an overlapping portion with the initial region, and there is a second image pickup boundary line that does not overlap with the initial region, determine an orientation of the second image pickup boundary line with respect to the first image pickup boundary line as a moving direction, determine a maximum distance between the initial region and the first image pickup boundary line as a total moving length, generate a trigger instruction, determine the trigger instruction as a second trigger instruction, and control the product 22 to move in the moving direction until a moving stroke reaches the total moving length, and stop moving.
Optionally, the product moving module 6 is further configured to determine, when the initial region does not coincide with the image capturing region 55, an image capturing boundary line closest to the initial region as a third image capturing boundary line, and determine an image capturing boundary line farthest from the initial region as a fourth image capturing boundary line; and the control module is further configured to determine the direction of the fourth camera shooting boundary line relative to the third camera shooting boundary line as a moving direction, determine the maximum distance between the initial region and the third camera shooting boundary line as a total moving length, generate a trigger instruction, determine the trigger instruction as a second trigger instruction, and control the product 22 to stop moving along the moving direction until a moving stroke reaches the total moving length.
Optionally, the trigger control module 7 is further configured to determine, when the trigger instruction is a second trigger instruction, a minimum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as a minimum stroke, and determine a maximum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as a maximum stroke; the system is further used for determining the initial triggering time edge = minimum travel/preset moving speed based on the maximum travel and the minimum travel, and determining the total triggering times = (maximum travel-the minimum travel)/the distance between two shooting boundary lines; the system is also used for controlling the camera device 33 and all the light sources 44 to trigger until the actual trigger times of the camera device 33 and all the light sources 44 reach the total trigger times, and stopping triggering; the initial triggering edge refers to a corresponding time length from when the product 22 starts to move to when the camera device 33 is triggered for the first time, and the triggering time of the camera device 33 and all the light sources 44 = time when the product 22 starts to move + the initial triggering edge.
Optionally, the product moving module 6 is further configured to generate a trigger instruction when there is an overlapping portion between the initial region and the image capturing region 55, and all image capturing boundary lines have overlapping portions with the initial region, and the area of the initial region is equal to the area of the overlapping portion, and determine the trigger instruction as the first trigger instruction.
Optionally, the product moving module 6 is further configured to generate and display warning information when an overlapping portion exists between the initial region and the image capturing region 55, all image capturing boundary lines have an overlapping portion with the initial region, and the area of the initial region is greater than that of the overlapping portion.
The embodiment of the application also discloses a detection control device, which comprises a memory and a processor, wherein the memory is stored with a computer program which can be loaded by the processor and can execute the time-sharing exposure detection method of the line scan camera.
An embodiment of the present application further discloses a computer-readable storage medium, which stores a computer program that can be loaded by a processor and execute the time-sharing exposure detection method of the line scan camera, where the computer-readable storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above examples are only used to illustrate the technical solutions of the present application, and do not limit the scope of protection of the application. It is to be understood that the embodiments described are only some 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 these embodiments without making any inventive step, are within the scope of the present application.
Claims (9)
1. A time-sharing exposure detection method for a line scanning camera is characterized by comprising the following steps: the method comprises the following steps: the method comprises the steps that camera equipment and a plurality of light sources are installed in advance, the brightness value of each light source is set, and a product is placed in a preset placing area, wherein the irradiation areas of all the light sources cover the placing area, and the camera area of the camera equipment is contained in the placing area; further comprising:
receiving a detection signal, and controlling the product to move along a specified track, wherein the specified track refers to a path corresponding to the product when the product completely passes through the camera shooting area;
controlling the camera equipment and all the light sources to simultaneously trigger at the same frequency based on a preset frequency, and stopping triggering until the triggering times reach the preset triggering times;
acquiring a line scanning image, extracting pixels from the line scanning image at intervals based on the actual size of a product in the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected; the line scanning image refers to an image shot by the image pickup device each time the image pickup device is triggered;
the image pickup area comprises two image pickup boundary lines; the controlling the product to move along a designated track comprises the following steps:
acquiring an initial region of the product, wherein the initial region refers to a position of the product in a storage region before the product is moved;
if the initial region and the shooting region have overlapped parts and all the shooting boundary lines do not have overlapped parts with the initial region, generating a trigger instruction and determining the trigger instruction as a first trigger instruction;
if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction;
the controlling the camera device and all the light sources to simultaneously trigger at the same frequency based on the preset frequency until the triggering frequency reaches the preset triggering frequency comprises the following steps:
if the trigger instruction is a first trigger instruction, controlling the camera equipment and all the light sources to simultaneously trigger once at the same frequency according to a preset frequency and then stopping;
and if the trigger instruction is a second trigger instruction, controlling the camera equipment and all the light sources to be simultaneously triggered at the same frequency according to a preset frequency, and stopping triggering until the triggering times reach the preset triggering times.
2. The time-sharing exposure detection method of the line scan camera according to claim 1, wherein: the appointed track comprises a moving direction and a total moving length, the moving direction refers to the direction of the product when the product moves through the shooting area, and the total moving length refers to a corresponding stroke when the product completely passes through the shooting area; if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction, wherein the method comprises the following steps of:
if the initial region and the shooting region have an overlapped part, a first shooting boundary line overlapped with the initial region and a second shooting boundary line not overlapped with the initial region exist, determining the direction of the second shooting boundary line relative to the first shooting boundary line as a moving direction, determining the maximum distance between the initial region and the first shooting boundary line as a total moving length, generating a trigger instruction, determining the trigger instruction as a second trigger instruction, and controlling the product to move along the moving direction until a moving stroke reaches the total moving length.
3. The time-sharing exposure detection method of the line scan camera according to claim 2, wherein: if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction, further comprising:
if the initial region does not coincide with the image pickup region, determining an image pickup boundary line closest to the initial region as a third image pickup boundary line, and determining an image pickup boundary line farthest from the initial region as a fourth image pickup boundary line;
and determining the direction of the fourth shooting boundary line relative to the third shooting boundary line as a moving direction, determining the maximum distance between the initial area and the third shooting boundary line as the total moving length, generating a trigger instruction, determining the trigger instruction as a second trigger instruction, and controlling the product to move along the moving direction until the moving stroke reaches the total moving length.
4. The time-sharing exposure detection method of the line scan camera according to claim 3, wherein: if the trigger instruction is a second trigger instruction, controlling the camera device and all the light sources to simultaneously trigger at the same frequency according to a preset frequency, and stopping triggering until the triggering frequency reaches the preset triggering frequency, wherein the triggering instruction comprises the following steps:
if the trigger instruction is a second trigger instruction, determining the minimum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as a minimum stroke, and determining the maximum value of the second camera shooting boundary line or the fourth camera shooting boundary line from the initial area as a maximum stroke;
determining the initial triggering edge = the minimum stroke/a preset moving speed based on the maximum stroke and the minimum stroke, and determining the total triggering times = (the maximum stroke-the minimum stroke)/the distance between two shooting boundary lines;
controlling the camera shooting equipment and all light sources to trigger until the actual triggering times of the camera shooting equipment and all light sources reach the total triggering times; the initial triggering time edge refers to a corresponding time length from the time when the product starts to move to the time when the image pickup device is triggered for the first time, and the triggering time of the image pickup device and all the light sources is = the time when the product starts to move + the initial triggering time edge.
5. The time-sharing exposure detection method of the line scan camera according to claim 1, wherein: if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction, wherein the method comprises the following steps of:
and if the initial region and the shooting region have overlapped parts, all shooting boundary lines have overlapped parts with the initial region, and the area of the initial region is equal to that of the overlapped parts, generating a trigger instruction, and determining the trigger instruction as a first trigger instruction.
6. The time-sharing exposure detection method of the line scan camera according to claim 1, wherein: if the initial area is not overlapped with the shooting area or a shooting boundary line overlapped with the initial area exists, controlling the product to move along a specified track, generating a trigger instruction, and determining the trigger instruction as a second trigger instruction, further comprising:
and if the initial region and the shooting region have overlapped parts, all shooting boundary lines and the initial region have overlapped parts, and the area of the initial region is larger than that of the overlapped parts, generating and displaying early warning information.
7. The utility model provides a line scanning camera timesharing exposure detecting system which characterized in that: the method comprises the steps that camera equipment and a plurality of light sources are installed in advance, the brightness value of each light source is set, and a product is placed in a preset placing area, wherein the irradiation areas of all the light sources cover the placing area, and the camera area of the camera equipment is contained in the placing area; the method comprises the following steps:
the product moving module (6) is used for receiving a detection signal and controlling the product to move along a specified track, wherein the specified track refers to a path corresponding to the product when the product completely passes through the camera shooting area;
the trigger control module (7) is used for controlling the camera equipment and all the light sources to be simultaneously triggered at the same frequency based on a preset frequency, and stopping triggering until the triggering frequency reaches the preset triggering frequency;
the image acquisition processing module (8) is used for acquiring a line scanning image, extracting pixels from the line scanning image at intervals based on the actual size of a product in the line scanning image, recombining the extracted pixels according to a preset recombination rule to generate a plurality of images to be detected, and displaying all the images to be detected; the line scanning image refers to an image shot by the camera equipment each time the camera equipment is triggered;
the product moving module (6) is used for acquiring an initial region of the product, wherein the initial region refers to a position of the product in the storage region before the product is moved; the device is also used for generating a trigger instruction when the initial region and the shooting region have overlapped parts and all shooting boundary lines do not have overlapped parts with the initial region, and determining the trigger instruction as a first trigger instruction; the product is also used for controlling the product to move along a specified track when the initial area and the shooting area are not overlapped or a shooting boundary line overlapped with the initial area exists, a trigger instruction is generated, and the trigger instruction is determined as a second trigger instruction;
the trigger control module (7) is used for controlling the camera equipment and all the light sources to simultaneously trigger once at the same frequency according to a preset frequency and then stop when the trigger instruction is a first trigger instruction; and when the trigger instruction is a second trigger instruction, controlling the camera device and all the light sources to simultaneously trigger at the same frequency according to a preset frequency until the triggering frequency reaches the preset triggering frequency.
8. A detection control apparatus comprising a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and that executes the method of any of claims 1 to 6.
9. A computer-readable storage medium, in which a computer program is stored which can be loaded by a processor and which executes the method of any one of claims 1 to 6.
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