CN110446023B - Method and system for detecting electronic ink screen - Google Patents
Method and system for detecting electronic ink screen Download PDFInfo
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- CN110446023B CN110446023B CN201810418389.XA CN201810418389A CN110446023B CN 110446023 B CN110446023 B CN 110446023B CN 201810418389 A CN201810418389 A CN 201810418389A CN 110446023 B CN110446023 B CN 110446023B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
Abstract
The embodiment of the invention discloses a method and a system for detecting an electronic ink screen, which are used for improving the efficiency of detecting the electronic ink screen. The method provided by the embodiment of the invention comprises the following steps: acquiring at least two detection images, wherein the detection images are obtained by shooting a display surface of an electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions; performing data fusion on the at least two detection images to obtain quality data, wherein the quality data represents the quality characteristics of the electronic ink screen; and analyzing to obtain a detection result according to the quality data, wherein the detection result is a quality detection result of the electronic ink screen. Therefore, the quality of the electronic ink screen can be automatically detected by analyzing the detection image obtained by shooting the electronic ink screen, and the detection efficiency is improved.
Description
Technical Field
The invention relates to the field of equipment detection, in particular to a method and a system for detecting an electronic ink screen.
Background
Electronic ink screens are devices that use electronic ink, which is typically made in the form of a thin film, to implement a display. The electronic ink screen has the obvious advantages of low power consumption, ultra-thinness, visibility under strong light, no flicker, large visual angle, flexibility and the like, so that in recent years, the electronic ink screen is widely applied to the fields of mobile phones, wearable equipment, electronic tags and the like.
In the production and manufacturing process of the electronic ink screen, the quality of the electronic ink screen is not satisfactory due to poor conditions of uneven electronic ink coating, local missing of an ink layer, damage of an electrode plate, impurity incorporation and the like. For this reason, the electronic ink screen needs to be inspected. The existing detection mode is mainly manual detection, namely the electronic ink screen is driven to be in different display states, and then whether the display effect of the electronic ink screen meets the requirement or not is judged manually, so that the defective electronic ink screen is screened out.
The mode of manually detecting the defective electronic ink screen has low detection efficiency and is easy to have misjudgment.
Disclosure of Invention
The embodiment of the invention provides a method and a system for detecting an electronic ink screen, which are used for improving the efficiency of detecting the electronic ink screen.
In a first aspect, an embodiment of the present invention provides a method for detecting an electronic ink screen, where the method includes: and acquiring at least two detection images, wherein the detection images are images obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions. The electronic ink screen is to be detected, and the electronic ink screen can not emit light, so that a detection image needs to be shot when the electronic ink screen is irradiated by a light source in order to obtain an image beneficial to detection. And then, carrying out data fusion on at least two detection images to obtain quality data, wherein the quality data represents the quality characteristics of the electronic ink screen. Therefore, according to the quality data, a detection result is obtained through analysis, and the detection result is a quality detection result of the electronic ink screen.
Therefore, different detection images are obtained by shooting the electronic ink screen under different test conditions, so that when the data of the at least two detection images are fused, the difference generated by the detection images due to different test conditions can be utilized, and the quality data representing the quality characteristics of the electronic ink screen can be obtained. Therefore, the detection result can be obtained through analysis according to the quality data, and the quality detection of the electronic ink screen is realized. Through the analysis of the detection image obtained by shooting the electronic ink screen, the quality of the electronic ink screen can be automatically detected, and the detection efficiency is improved.
With reference to the first aspect of the embodiment of the present invention, in a first implementation manner of the first aspect of the embodiment of the present invention, acquiring at least two detection images includes: when the electronic ink screen is irradiated by the first light source and is in a preset display state, controlling a camera to shoot a display surface of the electronic ink screen to obtain a detection image; when the electronic ink screen is irradiated by the second light source and is in a preset display state, the camera is controlled to shoot the display surface of the electronic ink screen to obtain a detection image. The angles of the first light source and the second light source irradiating the electronic ink screen are different. The test conditions corresponding to the obtained detection image are light sources, and the irradiation angles of the electronic ink screen irradiated by different light sources are different. These different inspection images may be used to perform quality inspection on the electronic ink screen being photographed, for example, to inspect the spatial depth of the display surface of the electronic ink screen.
With reference to the first aspect of the embodiment of the present invention, in a second implementation manner of the first aspect of the embodiment of the present invention, acquiring at least two detection images includes: when the electronic ink screen is irradiated by the light source and is in a preset display state, the camera is controlled to shoot the display surface of the electronic ink screen so as to obtain a detection image. The preset display state comprises a display state of the electronic ink screen when the voltage is preset, the preset voltage comprises a first driving voltage and a second driving voltage, and the first driving voltage is greater than the second driving voltage. Under the drive of different voltages, the display states of the electronic ink screens are different, the electronic ink screens in different display states are shot to obtain detection images, the electronic ink screens recorded by the detection images are the same electronic ink screen and are irradiated by the same light source, but the drive voltages are different, so that the display states are different. The different detection images can be used for quality detection of the shot electronic ink screen, for example, detection of the display effect of the display surface of the electronic ink screen.
With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a third implementation manner of the first aspect of the embodiment of the present invention, after acquiring at least two detection images, the method of this implementation manner further includes: and determining at least two first detection images from the at least two detection images, wherein the electronic ink screens recorded by different first detection images are in the same display state and are irradiated by light sources with different irradiation angles.
Correspondingly, data fusion is carried out on at least two detection images to obtain quality data, and the quality data comprises the following steps: and analyzing the at least two first detection images to obtain spatial quality data, wherein the spatial quality data represents three-dimensional information of a display surface of the electronic ink screen. The spatial quality data is used for analysis, and whether the spatial depth quality of the display surface of the detected electronic ink screen meets the requirement or not can be determined, namely the detection result is the three-dimensional detection result of the display surface of the electronic ink screen. For example, whether the electronic ink screen has a dent or a scratch or the like is detected.
With reference to the second implementation manner of the first aspect of the embodiment of the present invention, in a fourth implementation manner of the first aspect of the embodiment of the present invention, after acquiring at least two detection images, the method of this implementation manner further includes: and determining at least two second detection images from the at least two detection images, wherein the electronic ink screens recorded by the different second detection images are in different display states and are irradiated by the same light source.
Correspondingly, data fusion is carried out on at least two detection images to obtain quality data, and the quality data comprises the following steps: and analyzing the at least two second detection images to obtain reflectivity data, wherein the reflectivity data represents the variable quantity of the reflectivity of the electronic ink screen to the light when the electronic ink screen is in two different display states. And analyzing by using the reflectivity data, so that the quality of the display effect of the detected electronic ink screen can be determined, and the obtained detection result is the detection result of the surface brightness consistency of the electronic ink screen.
With reference to the first aspect of the embodiment of the present invention, in a fifth implementation manner of the first aspect of the embodiment of the present invention, analyzing, according to the quality data, to obtain a detection result includes: and determining pixel point data according to the quality data, wherein the pixel point data represents the quality characteristics of the electronic ink screen which are represented by taking pixel points as units. Thereby, the quality data can be subjected to detailed analysis. And when the pixel point data does not meet the preset quality requirement, determining the pixel point data as dead point data, wherein the dead point data represents that the quality characteristic of the electronic ink screen represented by the pixel point data does not meet the requirement. When the quantity of the bad point data is larger than the preset quantity threshold value, the area where the quality of the detected electronic ink screen does not meet the requirement can be determined to be larger, the use of a user is influenced, and therefore the electronic ink screen can be determined to be the electronic ink screen with the quality defect. Therefore, the electronic ink screen can be detected more carefully, and the false detection of the electronic ink screen meeting the use requirement is avoided.
In a second aspect, an embodiment of the present invention provides a detection system, which has a function of executing the above method. The functions may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In one possible implementation, the detection system includes:
the electronic ink screen comprises an acquisition module, a detection module and a display module, wherein the acquisition module is used for acquiring at least two detection images, the detection images are obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions;
the processing module is used for carrying out data fusion on at least two detection images to obtain quality data, and the quality data represents the quality characteristics of the electronic ink screen;
and the analysis module is used for analyzing to obtain a detection result according to the quality data, and the detection result is a quality detection result of the electronic ink screen.
In another possible implementation, the detection system includes:
a transceiver, a processor;
the transceiver performs the following actions: acquiring at least two detection images, wherein the detection images are obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions;
the processor performs the following acts: performing data fusion on at least two detection images to obtain quality data, wherein the quality data represents the quality characteristics of the electronic ink screen;
the processor also performs the following acts: and analyzing to obtain a detection result according to the quality data, wherein the detection result is a quality detection result of the electronic ink screen.
In a third aspect, an embodiment of the present invention provides a computer storage medium, where a program code is stored, and the program code is used to instruct to execute the method of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where instructions are stored, and when the instructions are executed on a computer, the computer is caused to execute the method according to the first aspect and the implementation manner of the first aspect.
In a fifth aspect, an embodiment of the present invention provides a computer program product containing instructions, which when run on a computer, cause the computer to perform the method according to the first aspect and the implementation manner of the first aspect.
In a sixth aspect, an embodiment of the present invention provides a detection system, including: a processor and a memory;
by calling the operation instructions stored in the memory, the processor causes the detection system to perform the method according to the first aspect and the implementation manners of the first aspect.
According to the technical scheme, the embodiment of the invention has the following advantages:
and acquiring at least two detection images, wherein the detection images are images obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is irradiated by the light source. And then, carrying out data fusion on at least two detection images to obtain quality data. Because different detection images are obtained by shooting the electronic ink screen under different test conditions, when the data of the at least two detection images are fused, the difference generated by the detection images can be caused by different test conditions, and the quality data representing the quality characteristics of the electronic ink screen can be obtained. Therefore, the detection result can be obtained through analysis according to the quality data, and the detection result is the quality detection result of the electronic ink screen. Therefore, the quality of the electronic ink screen can be automatically detected by analyzing the detection image obtained by shooting the electronic ink screen, and the detection efficiency is improved.
Drawings
Fig. 1 is a schematic hardware structure diagram of a detection system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an electronic ink screen membrane system according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a bistable property of electronic ink according to another embodiment of the present invention;
FIG. 4 is a flowchart of a method for detecting an electronic ink screen according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a detection system according to another embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a system for detecting an electronic ink screen, which are used for improving the efficiency of detecting the quality of the electronic ink screen.
Fig. 1 is a schematic diagram of a hardware structure of a detection system according to an embodiment of the present invention. Referring to fig. 1, the detection system of the embodiment of the invention includes a controller, a light source, and a camera. The detection system can be used for detecting the quality defect of the electronic ink screen. The controller is respectively connected with the light source, the camera and the electronic ink screen, and can be in wired connection or wireless connection, so that the controller can control the light source, the camera and the electronic ink screen.
The number of the light sources of the embodiment of the present invention may be one or more, and in the example of fig. 1, the number of the light sources is plural. The light source is used for irradiating the electronic ink screen, and the angles of the different light sources for irradiating the electronic ink screen are different, namely the incident angles of the light rays emitted by the different light sources relative to the electronic ink screen are different. The controller can control the use of the light source, including controlling the on-off of the light source, the irradiation duration and the like.
The electronic ink screen is a device for realizing display by using electronic ink. Electronic ink screens are made up of a number of electronic inks, which are typically formed into thin films for use in electronic displays. The structure of the electronic ink screen membrane system is shown in fig. 2. The electronic ink is similar to a capsule structure, and liquid charges are arranged in the electronic ink, wherein positive charges can be dyed white, and negative charges can be dyed black. When positive and negative voltages are applied to one side of the electronic ink, the liquid with charges can be respectively attracted and repelled to be reflected on the electronic ink screen, and white or black can be displayed for pixel points.
In embodiments of the present invention, the controller may be used to drive the display of the electronic ink screen. For example, a plurality of positive voltages are set between zero and a predetermined positive voltage, and the controller can drive the electronic ink screen to display at the plurality of positive voltages respectively. And setting a plurality of negative voltages between zero and a preset negative voltage, wherein the controller can drive the electronic ink screen to display at the plurality of negative voltages respectively.
As shown in fig. 2, the electronic ink screen is controlled to gradually change from black to white or from white to black by changing the voltage between the substrates. The electronic ink has a bistable characteristic, and as shown in fig. 3, the horizontal axis represents voltage, the vertical axis represents gradation, and the vertical axis represents white as it goes to the positive direction and black as it goes to the negative direction. With such an effect, a positive voltage is supplied to the lower substrate of the electronic ink panel shown in fig. 2, and the positive voltage is gradually increased from 0 to B, and the state of the display of the electronic ink panel is gradually increased from a point a in fig. 3 to display white to the user. When the electronic ink screen is powered off, the electronic ink screen maintains the current display state. On the contrary, a negative voltage from 0 to D is applied to the electronic ink panel, and the state of the display of the electronic ink panel is lowered from C to display black to the user.
The camera is used for photographing, and includes an optical lens, a Charge-coupled Device (CCD), a Complementary Metal Oxide Semiconductor (cmos), or other related devices. When the electronic ink screen is illuminated by the light source, the camera may capture the electronic ink screen, obtain an image, and then transmit the obtained image to the controller. In the embodiment of the present invention, the controller may control a photographing action of the camera.
The controller can comprise a central processing unit and other components, and can control the light source, the electronic ink screen and the camera to acquire images of the electronic ink screen under the irradiation of the light source, and perform calculation analysis on the images to realize quality detection on the electronic ink screen and judge whether the electronic ink screen is a defective electronic ink screen.
In the production and manufacturing process of the electronic ink screen, the quality of the electronic ink screen is not satisfactory due to poor conditions of uneven electronic ink coating, local missing of an ink layer, damage of an electrode plate, impurity incorporation and the like. For example, electronic ink screen membranes appear: concave-convex, foreign matter, white point, dead point, gray scale point, dead line, color difference, pockmark, abnormal driving, flash point, aluminum foil scratch, pinhole, stripe, dead point, orange peel, lack coating, scratch, black point, glue scratch, aluminum foil break, edge, brushing dead hole, crease, cleaning, indentation, bubble, foreign matter, puncture wound, fault, water inlet, dead position abnormity, cleaning dead hole, protective film wound, half cut defect, warping, burr, pulling dead hole, gravure, dislocation and the like.
The detection system provided by the embodiment of the invention can detect the quality of the electronic ink screen and identify the electronic ink screen which meets the quality requirement and does not meet the quality requirement.
It is understood that the structure of the detection system shown in fig. 1 is only an exemplary illustration, and does not specifically limit the inspection system according to the embodiment of the present invention, and the detection system according to the embodiment of the present invention has other structural forms.
Fig. 4 is a flowchart of a method for detecting an electronic ink screen according to an embodiment of the present invention, where the method can be applied to the detection system shown in fig. 1.
Referring to fig. 4, the method for detecting an electronic ink screen according to an embodiment of the present invention includes:
step 401: at least two inspection images are acquired.
The detection image is an image obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is irradiated by the light source. Different detection images are obtained by shooting the electronic ink screen under different test conditions.
The detection system acquires at least two detection images, and the detection images record information of the display surface of the electronic ink screen, so that quality detection can be carried out on the electronic ink screen based on the detection images.
The electronic ink screens recorded by different detection images in the at least two detection images are under different detection conditions, and the electronic ink screens recorded by the different detection images are the same electronic ink screen. Therefore, the quality of the electronic ink screen can be detected according to the information difference generated by the detection image under different detection conditions.
Detection conditions include, but are not limited to: the voltage for driving the electronic ink screen, the type of the light source irradiating the electronic ink screen, the incident angle of the light emitted by the light source irradiating the electronic ink screen relative to the electronic ink screen, and the like. By changing the detection conditions while the electronic ink screen is being photographed, different detection images are captured.
Regarding the specific implementation manner of step 401, referring to the embodiment shown in fig. 1, when a specific light source irradiates the electronic ink screen, the controller controls the camera to shoot the display surface of the electronic ink screen, so as to obtain the detection image. Then, a detection condition is changed, and the controller controls the camera to shoot the display surface of the electronic ink screen, so that another detection image is obtained.
It is to be understood that in other embodiments of the present invention, the controller may acquire the at least two inspection images from other devices, which have the inspection images pre-stored therein.
Regarding the specific implementation of step 401, two specific examples are given below:
image acquisition example one:
when the detection condition is that the angle at which the light source irradiates the electronic ink screen is different, in a specific example, step 401 specifically includes: when the electronic ink screen is irradiated by the first light source and is in a preset display state, controlling a camera to shoot a display surface of the electronic ink screen to obtain a detection image; and when the electronic ink screen is irradiated by the second light source and is in a preset display state, controlling the camera to shoot the display surface of the electronic ink screen to obtain a detection image.
The angles of the first light source and the second light source irradiating the electronic ink screen are different.
In this way, the electronic ink panels for different detected image recordings are in the same display state, but the irradiation angles of the light sources irradiating the electronic ink panels are different. The different detection images obtained by the way of example one can be used for analyzing the three-dimensional information of the display surface of the electronic ink screen to determine the surface depth quality of the display surface of the electronic ink screen.
For example, in the detection system shown in FIG. 1, the first light source and the second light source illuminate the electronic ink screen at different angles. The controller controls the electronic ink screen to be in a target voltage, the electronic ink screen is driven to be in a target display state, then the controller controls the first light source to be turned on, and the second light source is turned off, so that the electronic ink screen is irradiated by the first light source. And then, the controller controls the camera to shoot the electronic ink screen to obtain a detection image. And then, when the electronic ink screen keeps the target display state, the controller controls the second light source to be started, the first light source to be closed, and when the electronic ink screen is irradiated by the second light source, the controller controls the camera to shoot the display surface of the electronic ink screen to obtain another detection image.
It will be appreciated that in example one, two light sources may be involved, and that there may be more light sources for illuminating the electronic ink screen, with the different light sources illuminating the electronic ink screen at different angles. When the electronic ink screen is shot by the camera, one light source may illuminate the electronic ink screen, or a plurality of light sources may illuminate the electronic ink screen, which is not specifically limited in the embodiment of the present invention.
Image acquisition example two:
in a specific example, when the detection condition is that the display states of the electronic ink screens are different, step 401 specifically includes: when the electronic ink screen is irradiated by the light source and is in a preset display state, the camera is controlled to shoot the display surface of the electronic ink screen so as to obtain a detection image.
The preset display state comprises a display state of the electronic ink screen when the voltage is preset, the preset voltage comprises a first driving voltage and a second driving voltage, and the first driving voltage is greater than the second driving voltage. For example, the preset voltages include at least two voltages from zero voltage to a preset positive voltage and at least two voltages from zero voltage to a preset negative voltage.
Because the preset voltage is a plurality of different voltages, the electronic ink screen is in different display states under different voltage driving, as shown in fig. 3. And when the light source irradiating the electronic ink screen is kept unchanged and the electronic ink screen is in a specific display state, the camera shoots the electronic ink screen to obtain a detection image. The electronic ink screen can be shot by the camera to obtain detection images under different display states, so that different detection images can record different display states of the electronic ink screen.
For example, in the detection system shown in FIG. 1, the controller may control the voltage that drives the electronic ink screen. The voltage between zero voltage and the preset positive voltage is divided into N0 levels to obtain N0 voltages, and the voltage between zero voltage and the preset negative voltage is divided into N1 levels to obtain N1 voltages. And then the controller respectively provides the N0 voltages and the N1 voltages for the electronic ink screen, drives the electronic ink screen to display a plurality of display states, and can control the camera to shoot the display surface of the electronic ink screen to obtain a plurality of detection images in each display state.
It is understood that, in some embodiments, as shown in fig. 3, when N0 positive voltages are applied to the electronic ink screen, the display state of the electronic ink screen is controlled to be located from point a to point BMAXBetween points; when N1 negative voltages are supplied to the electronic ink screen, the display state of the electronic ink screen is controlled to be located from point C to point DMINBetween the points. Thus, the display state difference of the electronic ink screen is large.
Image acquisition example three
It is understood that the manner of the above example one and example two may be combined into a specific embodiment in some embodiments of the invention.
For example, when the electronic ink screen is illuminated by the first light source and the electronic ink screen is in a preset display state, the camera is controlled to shoot the display surface of the electronic ink screen to obtain a detection image. And when the electronic ink screen is irradiated by the second light source and is in a preset display state, controlling the camera to shoot the display surface of the electronic ink screen to obtain a detection image. The angles of the first light source and the second light source irradiating the electronic ink screen are different, the preset display state comprises a display state of the electronic ink screen when the preset voltage is applied, the preset voltage comprises a first driving voltage and a second driving voltage, and the first driving voltage is greater than the second driving voltage. Different detection images acquired in this way can correspond to different light sources or different display states, so that different detection images can be obtained by shooting the electronic ink screen under different test conditions.
It can be understood that, in the embodiment of the present invention, the display state is a state that is expressed when the display surface of the electronic ink screen is displayed. For example, in a black-and-white electronic ink screen, the display state represents the shade of the gray scale displayed by the electronic ink screen.
Step 402: and performing data fusion on the at least two detection images to obtain quality data.
Wherein the quality data is indicative of a quality characteristic of the electronic ink screen. For example, the quality data may be a new image obtained by fusing the detected images, and the new image may reflect the quality characteristics of the detected electronic ink screen.
After the detection images are obtained, because the electronic ink screens recorded by different detection images are under different test conditions, the information recorded by different detection images may have difference, the detection system performs data fusion on different detection images, namely, integrates the information of different detection images to obtain required quality data, and the quality data can represent the quality characteristics of the electronic ink screens, so that the quality of the electronic ink screens can be analyzed based on the quality data.
Step 403: and analyzing to obtain a detection result according to the quality data.
And the detection result is the quality detection result of the electronic ink screen.
After the quality data are obtained through calculation, the quality data represent the quality characteristics of the electronic ink screen, so that the detection system can perform calculation analysis on the quality data to obtain a detection result, and whether the display surface of the electronic ink screen recorded by the detection image meets the quality requirement is determined.
Because the quality requirements of the electronic ink screen are various, different inspection results can be correspondingly obtained in step 403 according to different quality data obtained in step 402.
The following are examples:
example one: in the above-mentioned "image acquisition example one", after step 401, the method of the embodiment of the present invention further includes: and determining at least two first detection images from the at least two detection images, wherein the electronic ink screens recorded by different first detection images are in the same display state and are irradiated by light sources with different irradiation angles. Thus, step 402 specifically includes: and analyzing the at least two first detection images to obtain spatial quality data, wherein the spatial quality data represents three-dimensional information of a display surface of the electronic ink screen. And analyzing to obtain a detection result according to the space quality data, wherein the detection result is a three-dimensional detection result of the display surface of the electronic ink screen.
In this example, the first detected image may be analyzed by a three-dimensional reconstruction technique to obtain spatial quality data, which may be an image with depth information. Specific three-dimensional reconstruction techniques may be, for example, a shadow-restoration shape method, a stereo vision method, and the like.
Example two: in the above-mentioned "image acquisition example two", after step 401, the method of the embodiment of the present invention further includes: and determining at least two second detection images from the at least two detection images, wherein the electronic ink screens recorded by the different second detection images are in different display states and are irradiated by the same light source. Thus, step 402 specifically includes: and analyzing the at least two second detection images to obtain reflectivity data, wherein the reflectivity data represents the variable quantity of the reflectivity of the electronic ink screen to the light when the electronic ink screen is in two different display states. According to the reflectivity data, a detection result can be obtained through analysis, and the detection result is a surface brightness consistency detection result of the electronic ink screen.
There are various specific implementations of step 403, for example, the quality data can be directly used for analysis, so as to obtain the detection result. Or after processing the quality data, analyzing to obtain a detection result, which is exemplified as follows:
optionally, step 403 specifically includes steps a 1-A3.
Step A1: and determining pixel point data according to the quality data, wherein the pixel point data represents the quality characteristics of the electronic ink screen which are represented by taking the pixel points as units.
Step A2: and when the pixel point data does not meet the preset quality requirement, determining the pixel point data as dead point data. The preset quality requirement can be a quality requirement set by a user, and the bad point data is pixel point data of which the reflected quality does not meet the requirement.
Step A3: and when the quantity of the bad point data is greater than a preset quantity threshold value, determining that the electronic ink screen is the electronic ink screen with quality defects. Wherein, the preset data threshold value can be set by the user.
After the dead pixel data is determined, the number of the dead pixel data can be calculated, and when the number of the dead pixel data is larger than a preset number threshold, the defect area of the electronic ink screen is large and does not meet the quality requirement, so that the electronic ink screen is determined to be the electronic ink screen with the quality defect. When the quantity of the bad point data is smaller than or equal to the preset quantity threshold value, the electronic ink screen has no quality defect, or the area with the quality defect does not influence the use of a user, so that the electronic ink screen can be determined to be good.
In summary, at least two detection images are obtained, where the detection images are images obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is illuminated by the light source. And then, carrying out data fusion on at least two detection images to obtain quality data. Because different detection images are obtained by shooting the electronic ink screen under different test conditions, when the data of the at least two detection images are fused, the difference generated by the detection images can be caused by different test conditions, and the quality data representing the quality characteristics of the electronic ink screen can be obtained. Therefore, the detection result can be obtained through analysis according to the quality data, and the detection result is the quality detection result of the electronic ink screen. Therefore, the quality of the electronic ink screen can be automatically detected by analyzing the detection image obtained by shooting the electronic ink screen, and the detection efficiency is improved.
In order to more intuitively understand the method of the embodiment of the present invention, the following describes the method of detecting an electronic ink screen according to the embodiment of the present invention with a specific use scenario. The following were used:
in the coil material and the manufacturing process of the actual production of the electronic ink screen, the poor states of uneven coating of the electronic ink, local ink layer loss, electrode plate damage, impurity incorporation and the like are often accompanied, so that the quality defect of the electronic ink screen is directly or indirectly caused. For this reason, quality inspection of the electronic ink screen is required.
The apparatus for detection may be a detection system as shown in fig. 1. The electronic ink screen to be detected is placed at the detection position of the detection system shown in fig. 1 to detect the electronic ink screen. Specifically, the detection can be performed on the detection system after the electronic ink screen is replaced each time.
As shown in FIG. 3, the controller controls the driving voltage of the electronic ink screen to change the display state of the electronic ink screen from A to BMAXDividing the display state into N0 levels, wherein the display state A is the display state when the electronic ink screen is driven by zero voltage, and the display state BMAXThe display state of the electronic ink screen is the display state when the electronic ink screen is driven by the voltage B, the voltage B is less than or equal to the maximum rated voltage of the electronic ink screen, and the obtained display states are numbered as (0,0), (0,1), …, (0, p), … and (0, N0); and driving the electronic ink screen to change the display state of the electronic ink screen from C to DMINThe state is divided into N1 levels, wherein, the display state C is the display state when the electronic ink screen is driven by zero voltage, and the display state DMINThe display state when the electronic ink panel is driven by the voltage D, the voltage D is greater than or equal to the minimum rated voltage of the electronic ink panel, and the obtained display states are numbered as (1,0), (1,1), …, (1, p), …, and (1, N1). Thus, the display state in which the electronic ink panel is driven is represented as D (k, p), where k is 0,0 ≦ p ≦ N0, or k is 1,0 ≦ p ≦ N1. This may be accomplished by controlling the voltage supplied to the electronic ink screen. For example, the voltage supplied to the electronic ink panel is classified into N0 levels from 0 to B, and the voltage supplied to the electronic ink panel is classified into N1 levels from 0 to D. Meanwhile, when the electronic ink screen displays a specific display state, different light sources are respectively used for irradiating the electronic ink screen, if m different light sources are provided for respectively irradiating the electronic ink screen, the angles of the m different light sources irradiating the electronic ink screen are different, and when the electronic ink screen displays a specific display state and is irradiated by a specific light source, the camera is controlled to shoot the electronic ink screenIn this way, the controller drives the electronic ink screen to display different display states in turn, different light sources are used for irradiating each display state in turn, each time the electronic ink screen determines one display state and is irradiated by one light source, the controller controls the camera to shoot the display surface of the electronic ink screen, so that (N0 × M + N1 × M) detection images can be obtained, and the electronic ink screen recorded by the detection images is in different test conditions, wherein N0, N1, p and M are all natural numbers.
After the display state of the electronic ink screen and the irradiation of the light sources with different angles are continuously switched, the detection images of the light with m angles in each display state D (k, p) of the electronic ink screen are obtained. The detected image is marked as I (k, p, I), wherein k is 0, p is not less than 0 and not more than N0, I is not less than 0 and not more than m or k is 1, p is not less than 0 and not more than N1, and I is not less than 0 and not more than m. i is a natural number. And fusing the image set into different image data according to a specific mode to obtain quality data representing the quality characteristics of the electronic ink screen so as to realize different defect detections.
The specific fusion mode is as follows:
in one example, this is achieved by means of fusion into spatial quality data. In this implementation, from among the above-acquired inspection images, inspection images having the same display state but different irradiation light sources are determined. At this time, the controller may determine an inspection image of K-K and P-P, K being 0 or 1, and P being any one of values between 0 and N0 or 0 and N1, for a plurality of detection images I (K, P, I). And the electronic ink screen recorded by the determined detection image is respectively irradiated by m light sources with different angles, so that an image set I (K, P, I) of the detection image is obtained, wherein I is more than or equal to 0 and less than or equal to m. Then, the image set I (K, P, I) is analyzed by a photometric stereo (photometric stereo) method to obtain spatial quality data Ips (K, P) of the surface of the electronic ink screen, wherein the spatial quality data Ips (K, P) represents three-dimensional stereo information of the electronic ink screen. The method of the present example utilizes photometric stereo techniques, calculates the normal vector of the object surface by analyzing the image, and recovers the three-dimensional surface information from the normal vector of the surface. The space quality data Ips (K, P) can be used to realize three-dimensional defect detection such as concave-convex, crease, gravure, and the like.
In another example, by fusion into reflectance data. In this implementation, from the acquired inspection images, inspection images with different display states of the electronic ink screen but the same irradiation light source are determined. At this time, the controller may determine an image corresponding to a specific light source I for a plurality of detection images I (k, p, I), where I denotes the number of the light source, and I is equal to I. The electronic ink screen has a bistable characteristic, so that the display state with an upward trend and the display state with a downward trend shown in fig. 3 can be respectively processed. Specifically, after an image with a light source I equal to I is determined, a set I (0, p, I) of detection images in N0 states of the electronic ink panel is determined with an electronic ink panel state k equal to 0, and p is 0 ≦ p ≦ N0, and the image set is subjected to log processing IL (0, p, I) ═ log2(I (0, p, I)), log2(I (0, p, I)) indicates that log processing is performed, and IL (0, p, I) indicates the result of the log processing. Then, the logarithm of two adjacent stages is determined from the logarithm of the image set, and the difference between the logarithms of two adjacent stages is calculated to eliminate the influence of the light source, so that the reflectance change Δ IL (0, p, I-1) ═ IL (0, p, I) -IL (0, p, I-1) of the surface of the electronic ink screen between two adjacent stages can be extracted. (I-1) represents another light source. The same method is used to process the image set I (0, p, I) of the detection images in N1 states of the electronic ink panel under the light source I ═ I and the electronic ink panel state k ═ 1, where 0 ≦ p ≦ N1, to obtain the reflectance change. The reflectivity change is mainly used for detecting the defect of inconsistent surface brightness of the electronic ink screen.
After the quality data is obtained in the above manner, for example, Ips (K, P) and Δ IL (0, P, I-1) are obtained, the detection result, which is the quality detection result of the electronic ink screen, can be calculated by using the manner of step 403 for these data.
For example, the above steps A1-A3 are used to find the detection result, and the following are exemplified:
example one: the quality data reflects the overall quality of the display surface of the electronic ink screen. And dividing the quality data into data taking pixel points as units to obtain pixel point data. Comparing each pixel point data with the first threshold value, and when one pixel point data is larger than the first threshold value, the pixel point is dead point data. The first threshold is a threshold preset by a worker, or a threshold determined according to the full image information, for example, when the quality data is spatial quality data, the first threshold is a threshold calculated by using a method such as a maximum inter-class variance threshold and a minimum error threshold.
Example two: pixel point data is determined from the quality data. And determining a target pixel point data from the plurality of pixel point data, and estimating partial quality data by using mean filtering and Gaussian filtering by taking the target pixel point data as a center to obtain background image data. And calculating the difference value delta (x, y) between the target pixel point data and the background image data, wherein (x, y) is the number of the pixel point. And comparing the difference value delta (x, y) with a second threshold value or a third threshold value, and determining the pixel data as bad pixel data when the difference value is greater than the second threshold value or the difference value is smaller than the third threshold value. Wherein the second threshold is a positive number, the third threshold is a negative number, and the second threshold and the third threshold can be preset by a user.
And when the quantity of the bad point data is greater than a preset quantity threshold value, the defect area of the electronic ink screen to be detected is greater than an acceptable degree, and therefore the electronic ink screen is determined to be a defective electronic ink screen. And when the number of the bad point data is smaller than the preset number threshold, the defect area of the electronic ink screen to be detected does not influence the use of a user, so that the electronic ink screen to be detected is determined to be a defect-free electronic ink screen. Therefore, the method for detecting the defective electronic ink screen can distinguish the good electronic ink screen from the defective electronic ink screen.
Therefore, by the method provided by the embodiment of the invention, whether the electronic ink screen has defects or not is detected by carrying out multi-dimensional image fusion on the detection images, and the separation of good products and defective products is realized. Moreover, the labor cost is reduced while the production efficiency is improved, the uniformity of detection standards is ensured, and the factory yield of the electronic ink screen can be well controlled.
Fig. 5 is a schematic structural diagram of a detection system according to an embodiment of the present invention, where the detection system can be applied to the detection system shown in fig. 1, and the detection system can be used to perform the method for detecting an electronic ink screen according to the embodiment shown in fig. 4.
As shown in fig. 5, the detection system of the embodiment of the present invention includes:
the acquiring module 501 is configured to acquire at least two detection images, where the detection images are obtained by shooting a display surface of an electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions;
the processing module 502 is configured to perform data fusion on at least two detection images to obtain quality data, where the quality data represents quality characteristics of an electronic ink screen;
and the analysis module 503 is configured to analyze the quality data to obtain a detection result, where the detection result is a quality detection result of the electronic ink screen.
Optionally, the obtaining module 501 is further configured to, when the electronic ink screen is illuminated by the first light source and the electronic ink screen is in a preset display state, control the camera to shoot a display surface of the electronic ink screen to obtain a detection image; when the electronic ink screen is irradiated by the second light source and is in a preset display state, controlling a camera to shoot a display surface of the electronic ink screen to obtain a detection image; the angles of the first light source and the second light source irradiating the electronic ink screen are different.
Optionally, the obtaining module 501 is further configured to control the camera to shoot the display surface of the electronic ink screen to obtain a detection image when the electronic ink screen is irradiated by the light source and the electronic ink screen is in a preset display state;
the preset display state comprises a display state of the electronic ink screen when the voltage is preset, the preset voltage comprises a first driving voltage and a second driving voltage, and the first driving voltage is greater than the second driving voltage.
Optionally, the detection system further comprises:
a determining module 504, configured to determine at least two first detection images from the at least two detection images, where electronic ink screens recorded in different first detection images are in the same display state and are illuminated by light sources with different illumination angles;
the processing module 502 is further configured to analyze the at least two first detection images to obtain spatial quality data, where the spatial quality data represents three-dimensional information of a display surface of the electronic ink screen;
and the detection result is a three-dimensional detection result of the display surface of the electronic ink screen.
Optionally, the detection system further comprises:
a determining module 504, configured to determine at least two second detection images from the at least two detection images, where electronic ink screens recorded in different second detection images are in different display states and are illuminated by the same light source;
the processing module 502 is further configured to analyze the at least two second detection images to obtain reflectivity data, where the reflectivity data represents a variation of reflectivity of the electronic ink screen to light when the electronic ink screen is in two different display states;
and the detection result is the surface brightness consistency detection result of the electronic ink screen.
Optionally, the analyzing module 503 is further configured to determine pixel point data according to the quality data, where the pixel point data represents quality characteristics of the electronic ink screen expressed in units of pixel points; when the pixel point data does not meet the preset quality requirement, determining the pixel point data as dead point data; and when the quantity of the bad point data is larger than a preset quantity threshold value, determining that the electronic ink screen is the electronic ink screen with quality defects.
In summary, the obtaining module 501 obtains at least two detection images, where the detection images are images obtained by shooting the display surface of the electronic ink screen when the electronic ink screen is illuminated by the light source. Then, the processing module 502 performs data fusion on at least two detection images to obtain quality data. Because different detection images are obtained by shooting the electronic ink screen under different test conditions, when the data of the at least two detection images are fused, the difference generated by the detection images can be caused by different test conditions, and the quality data representing the quality characteristics of the electronic ink screen can be obtained. Therefore, the analysis module 503 can analyze the quality data to obtain a detection result, where the detection result is a quality detection result of the electronic ink screen. Therefore, the quality of the electronic ink screen can be automatically detected by analyzing the detection image obtained by shooting the electronic ink screen, and the detection efficiency is improved.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program executes the method shown in fig. 4 when running.
An embodiment of the present invention provides an apparatus, where the apparatus includes a processor, a memory, and a program stored in the memory and capable of being executed on the processor, and the processor implements the method shown in fig. 4 when executing the program.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A method of detecting an electronic ink screen, comprising:
acquiring at least two detection images, wherein the detection images are obtained by shooting a display surface of an electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions;
performing data fusion on the at least two detection images to obtain quality data, wherein the quality data represents the quality characteristics of the electronic ink screen;
analyzing to obtain a detection result according to the quality data, wherein the detection result is a quality detection result of the electronic ink screen;
the acquiring of the at least two detection images includes:
when the electronic ink screen is irradiated by a light source and is in a preset display state, controlling a camera to shoot a display surface of the electronic ink screen to obtain a detection image;
the preset display state comprises a display state of the electronic ink screen at a preset voltage, the preset voltage comprises a first driving voltage and a second driving voltage, and the first driving voltage is greater than the second driving voltage;
after the acquiring of the at least two detection images, the method further comprises:
determining at least two second detection images from the at least two detection images, wherein the electronic ink screens recorded by the different second detection images are in different display states and are irradiated by the same light source;
the data fusion of the at least two detection images to obtain quality data comprises:
analyzing the at least two second detection images to obtain reflectivity data, wherein the reflectivity data represents the variable quantity of the reflectivity of the light when the electronic ink screen is in two different display states;
and the detection result is the surface brightness consistency detection result of the electronic ink screen.
2. The method of claim 1,
analyzing to obtain a detection result according to the quality data, wherein the detection result comprises the following steps:
determining pixel point data according to the quality data, wherein the pixel point data represents the quality characteristics of the electronic ink screen which are represented by taking pixel points as units;
when the pixel point data does not meet the preset quality requirement, determining the pixel point data as dead point data;
and when the quantity of the bad point data is greater than a preset quantity threshold value, determining that the electronic ink screen is the electronic ink screen with quality defects.
3. A detection system, comprising:
the electronic ink screen comprises an acquisition module, a detection module and a display module, wherein the acquisition module is used for acquiring at least two detection images, the detection images are obtained by shooting a display surface of the electronic ink screen when the electronic ink screen is irradiated by a light source, and different detection images are obtained by shooting the electronic ink screen under different test conditions;
the processing module is used for carrying out data fusion on the at least two detection images to obtain quality data, and the quality data represents the quality characteristics of the electronic ink screen;
the analysis module is used for analyzing to obtain a detection result according to the quality data, and the detection result is a quality detection result of the electronic ink screen;
the acquisition module is further used for controlling a camera to shoot a display surface of the electronic ink screen to obtain a detection image when the electronic ink screen is irradiated by a light source and is in a preset display state;
the preset display state comprises a display state of the electronic ink screen at a preset voltage, the preset voltage comprises a first driving voltage and a second driving voltage, and the first driving voltage is greater than the second driving voltage;
the detection system further comprises:
the determining module is used for determining at least two second detection images from the at least two detection images, and the electronic ink screens recorded by the different second detection images are in different display states and are irradiated by the same light source;
the processing module is further configured to analyze the at least two second detection images to obtain reflectivity data, where the reflectivity data represents the variation of the reflectivity of the light when the electronic ink screen is in two different display states;
and the detection result is the surface brightness consistency detection result of the electronic ink screen.
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