CN111787313A - Control system for detecting mobile phone camera module - Google Patents
Control system for detecting mobile phone camera module Download PDFInfo
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- CN111787313A CN111787313A CN202010751468.XA CN202010751468A CN111787313A CN 111787313 A CN111787313 A CN 111787313A CN 202010751468 A CN202010751468 A CN 202010751468A CN 111787313 A CN111787313 A CN 111787313A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
Abstract
The invention relates to the technical field of camera detection, in particular to a control system for detecting a mobile phone camera module, which comprises: the acquisition module is used for acquiring a picture of the camera module to be detected to obtain an acquired picture; the pre-judging module is used for judging whether the acquired picture meets the requirements or not according to a preset standard; the compensation module is used for performing light compensation when the collected picture does not meet the requirement; and the judging module is used for receiving the collected picture, searching the edge profile of the camera area on the collected picture, acquiring the maximum value of the shape function gradient of the edge profile, judging that the camera is normally installed if the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value, and otherwise judging that the camera is abnormally installed. The invention can perform collection again after light compensation under the condition of detecting insufficient ambient light, and solves the technical problem that the installation condition of the camera is difficult to accurately judge under the condition of detecting insufficient ambient light in the prior art.
Description
Technical Field
The invention relates to the technical field of camera detection, in particular to a control system for detecting a mobile phone camera module.
Background
The camera module is an assembly integrating a lens and an image processing circuit and provides an interface for the intelligent terminal to transmit shot image information. At present, basically all smart phones and tablet computers have a photographing function, and the quality of a camera module directly influences the user photographing experience. Therefore, the camera module needs to detect the parameters of its components before shipping, for example, visual inspection is widely used.
Visual detection, namely, a machine is used for replacing human eyes for measurement and judgment, and a shot target is converted into an image signal through an image shooting device and transmitted to a special image processing system; then according to the information of pixel distribution, brightness and color, etc., converting them into digital signals; finally, the image system performs various operations on the signals to extract the characteristics of the target, and then controls the on-site equipment action according to the judgment result. Visual inspection can be well used to detect camera die defects and to prevent defective products from being delivered to consumers.
For example, CN106937108A discloses a visual detection method and a control device for a camera on a mobile terminal, where a visual detector is used to take pictures of a mobile terminal to be detected, and perform edge contour detection on a camera area image on the taken picture, and if the maximum value of the edge shape function gradient obtained by detection is higher than or equal to a preset maximum value of a standard gradient, it is determined that the camera is normally installed, otherwise, it is determined that the camera is absent. By the method, whether the camera on the mobile terminal is normally installed or not can be automatically detected, the labor cost is reduced, the detection time is shortened, and the missed detection probability and the false detection probability are reduced to the greatest extent.
Whether the installation of the camera is normal or not is judged in a visual detection mode, and the mobile terminal to be detected needs to be shot in a close range. It is often necessary to use a separate proximity sensor in order to perform the proximity detection function. Proximity sensor all utilizes image sensor to receive light passively, and when the state of being close, because the space is narrow and small and the gesture shadow of sensor shelters from can have local dim light environment, also detect environment light not enough, and the quality of formation of image is relatively poor for the true condition that can't reflect the detection of formation of image, thereby reduced the degree of accuracy that detects, be difficult to the installation situation of accurate judgement camera.
Disclosure of Invention
The invention provides a control system for detecting a mobile phone camera module, which solves the technical problem that the installation condition of a camera is difficult to accurately judge under the condition of insufficient detection environment light in the prior art.
The basic scheme provided by the invention is as follows: a control system for cell-phone camera module detects includes:
the acquisition module is used for acquiring a picture of the camera module to be detected to obtain an acquired picture;
the pre-judging module is used for judging whether the acquired picture meets the requirements or not according to a preset standard;
the compensation module is used for performing light compensation when the acquired picture does not meet the requirement, and sending a command of acquiring the picture again to the acquisition module after the light compensation is finished; when the collected picture meets the requirements, sending the collected picture;
and the judging module is used for receiving the collected picture, searching the edge profile of the camera area on the collected picture, acquiring the maximum value of the shape function gradient of the edge profile, judging that the camera is normally installed if the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value, and otherwise judging that the camera is abnormally installed.
The working principle and the advantages of the invention are as follows: after the picture is collected and the collected picture is obtained, whether the installation of the camera is normal is not directly judged according to the collected picture, but before the judgment, one step of pre-judgment is added, and whether the collected picture meets the requirement is judged firstly. Judging whether the camera is normally installed only when the collected picture meets the requirements; and on the contrary, if the collected picture does not meet the requirement, performing light compensation, and after the light compensation is finished, collecting the picture again until the collected picture meets the requirement. Through such a mode, under dim light environment, also under the not enough condition of detection ring border light, the quality of gathering the picture is relatively poor, also when not meeting the requirement, can gather again after the light compensation to guarantee to be used for judging whether the camera installation is normal the quality of gathering the picture and satisfy the requirement, thereby improved the accuracy of judgement.
The invention can perform collection again after light compensation when the quality of the collected picture is poor under the condition of detecting insufficient ambient light, and solves the technical problem that the installation condition of the camera is difficult to accurately judge under the condition of detecting insufficient ambient light in the prior art.
Further, the specific way of light compensation is as follows: detecting the ambient light intensity of the current environment, determining light compensation information according to the ambient light intensity, wherein a light supplementing time period of light compensation and an exposure time period of picture collection have a coincidence time period.
Has the advantages that: the light compensation information is determined according to the light intensity of the environment, so that the light compensation can be adapted to the environment as much as possible, and the acquired picture is ensured to have the best quality; the light compensation time interval of the light compensation and the exposure time interval of the image acquisition have a coincidence time interval, so that the light compensation is more effective and more targeted.
Further, the duration of the coincidence period is greater than the preset duration, and the preset duration is at least the exposure duration of one pixel point.
Has the advantages that: the duration of the coincidence time period is guaranteed to be larger than the exposure duration of one pixel point, so that the light compensation can be guaranteed to have the most basic effect, and therefore invalid light compensation is avoided.
Further, the light supplement time period completely coincides with the exposure time period.
Has the advantages that: if the light supplement time period and the exposure time period are completely overlapped, the optimal and most sufficient light supplement effect can be ensured, and the quality of the collected picture is improved.
Further, the judging module comprises:
the searching unit is used for searching the edge contour of the camera area on the collected picture;
a calculation unit for obtaining a maximum value of a shape function gradient of the edge profile;
and the judging unit is used for judging whether the camera is normally installed according to whether the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value.
Has the advantages that: geometrically, if the camera is normally installed, the edge profile shape function gradient of the camera area is inevitably larger, so that whether the camera is normally installed is judged according to whether the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value, and the method is accurate and reliable.
Further, the judging module further comprises:
the storage unit is used for pre-storing the characteristic information and the position information of the characteristic area in the standard picture and the position information of the camera area in the standard picture;
and the characteristic unit is used for determining the position information of the characteristic area on the acquired picture according to the characteristic information.
Has the advantages that: by the mode, the position information of the feature area is predetermined, so that the edge contour search of the camera area is more targeted, the accuracy is improved, and the efficiency is improved.
Further, the judging module further comprises:
the position comparison unit is used for comparing the characteristic region position information of the standard picture with the characteristic region position information of the collected picture and determining the displacement compensation amount;
and the position compensation unit is used for superposing the displacement compensation quantity and the position information of the camera area in the standard picture to obtain the corrected position information of the camera area on the acquired picture.
Has the advantages that: by the method, the position information of the camera area on the acquired picture can be corrected, so that the error of edge contour searching of the camera area is reduced.
Further, the searching unit is also used for carrying out linear search and linear edge contour detection on the camera area image, and setting the linear search and the linear edge contour detection as the finest pixels.
Has the advantages that: by the method, the edge contour shape of the camera area can be more regular as much as possible, so that the calculation difficulty of the shape function gradient is reduced.
Furthermore, the searching unit is also used for searching the edge contour from the center of the image of the camera area.
Has the advantages that: by the method, the detection of the edge contour of the search is carried out from the center of the image of the camera area, so that the search efficiency can be improved.
And further, shooting the camera module qualified through manual detection to obtain a standard picture.
Has the advantages that: the standard picture obtained in such a way is more suitable for comparison.
Drawings
Fig. 1 is a block diagram of a system structure of an embodiment of a control system for detecting a camera module of a mobile phone according to the present invention.
Detailed Description
The following is further detailed by the specific embodiments:
example 1
The embodiment of the control system for detecting the mobile phone camera module is basically as shown in the attached figure 1, and comprises the following components:
the acquisition module is used for acquiring a picture of the camera module to be detected to obtain an acquired picture;
the pre-judging module is used for judging whether the acquired picture meets the requirements or not according to a preset standard;
the compensation module is used for performing light compensation when the acquired picture does not meet the requirement, and sending a command of acquiring the picture again to the acquisition module after the light compensation is finished; when the collected picture meets the requirements, sending the collected picture;
and the judging module is used for receiving the collected picture, searching the edge profile of the camera area on the collected picture, acquiring the maximum value of the shape function gradient of the edge profile, judging that the camera is normally installed if the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value, and otherwise judging that the camera is abnormally installed.
In this embodiment, the acquisition module, the pre-judgment module, the compensation module, and the judgment module are implemented by hardware, a program, or a program cooperated with hardware.
Firstly, the acquisition module acquires a picture of the camera module to be detected.
In this embodiment, the camera module is installed on mobile terminal, for example cell-phone, panel computer, and collection module is the visual detection machine, carries out the picture through the visual detection machine to the camera module and shoots. In the specific operation, the mobile terminal is usually moved into the sensing range of a sensor installed in the visual inspection machine, so that a camera on the visual inspection machine is automatically triggered to shoot pictures for the camera module, and the collected pictures are obtained.
Then, the prejudging module judges whether the acquired picture meets the requirements or not according to a preset standard.
And after the acquired picture is obtained, the prejudging module judges whether the acquired picture meets the requirement or not according to a preset standard. Specifically, the pre-judging module is a server and is loaded with picture analysis software, and the software can analyze the acquired picture and mainly analyze the brightness of the acquired picture. In this embodiment, the preset standard that the collected picture meets the requirement is that, among the pixel points of the collected picture, the luminance value of the pixel point with the minimum luminance value is greater than the luminance threshold value. By the mode, whether the acquired picture meets the requirements or not can be judged.
Then, when the collected picture does not meet the requirement, the compensation module carries out light compensation, and after the light compensation is finished, a command of collecting the picture again is sent to the collection module; and when the acquired picture meets the requirements, transmitting the acquired picture.
Specifically, the specific way of light compensation is as follows: first step, detect the current environment, also detect the ambient light intensity of camera module, can adopt dedicated ambient light sensor to carry out ambient light intensity and detect. And secondly, determining light compensation information according to the ambient light intensity, wherein the light compensation information comprises picture brightness adjustment information or a target brightness value to be adjusted, and the ambient light can be compensated through the light compensation information so as to meet the ambient light intensity requirement of the collected picture. And thirdly, performing light compensation according to the light compensation information, wherein a coincidence time interval exists between the light compensation time interval of the light compensation and the exposure time interval of the image acquisition. Therefore, light compensation information is determined according to the light intensity of the environment, so that the light compensation can be adapted to the environment as much as possible, and the acquired picture has the best quality. In this embodiment, to avoid invalid light compensation, the duration of the coincidence period is greater than the preset duration, the preset duration is at least the exposure duration of one pixel point, and the light supplement period completely coincides with the exposure period. By the mode, when the collected picture does not meet the requirement, light compensation is carried out, and after the light compensation is finished, picture collection is carried out again, so that the collected picture is guaranteed to be sent to be judged in the next step when the collected picture meets the requirement.
And finally, the judging module receives the collected picture, searches the edge profile of the camera area on the collected picture, acquires the maximum value of the shape function gradient of the edge profile, judges that the camera is normally installed if the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value, and otherwise judges that the camera is abnormally installed.
In this embodiment, the determining module includes a searching unit, a calculating unit, and a determining unit, the determining module is a server, and the searching unit, the calculating unit, and the determining unit all use existing software or programs, such as MATLAB software, that can implement their functions. When the collected picture is received, the collected picture meets the requirement, and the next judgment can be carried out. Specifically, in the first step, an edge contour of a camera area on the captured picture is searched, for example, the edge contour is searched from the center of the camera area image, a linear search and a linear edge contour detection are performed on the camera area image, and the linear search and the linear edge contour detection are set as the finest pixels. Therefore, the edge contour shape of the camera area can be more regular as much as possible, and the searching efficiency can be improved. In a second step, the maximum value of the shape function gradient of the edge profile is obtained, which can be achieved by the MATLAB-owned function. Thirdly, whether the camera is normally installed or not is quite obvious in difference, whether the camera is normally installed or not can be quickly judged according to whether the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value or not, and judgment results are output, for example, the camera is normally installed, Yes is output, the camera is abnormally installed, and No is output.
Example 2
The difference from the embodiment 1 is only that the judging module further includes: storage units, such as solid state drives; feature cells, such as MATLAB software; the position comparing unit and the position compensating unit are implemented, for example, by using related program codes in the prior art. The camera module qualified through manual detection is shot to obtain a standard picture, and then the characteristic information and the position information of the characteristic region in the standard picture and the position information of the camera region in the standard picture are stored in advance. In order to make the edge contour search of the camera area more targeted, before searching the edge contour of the camera area, the position information of the feature area on the acquired picture is determined according to the feature information. After the determination, in order to reduce the error of the edge contour search of the camera area, the position information of the camera area on the captured picture needs to be corrected. Specifically, the feature region position information of the standard picture is compared with the feature region position information of the acquired picture, the displacement compensation amount is determined, and then the displacement compensation amount is superposed with the camera region position information in the standard picture, so that the corrected camera region position information on the acquired picture can be obtained.
Example 3
Compared with the embodiment 2, the device is different only in that the device further comprises a picture acquisition mechanism, a picture identification module, an illumination mechanism and an adjusting mechanism. Before detecting the camera module, carry out light compensation and adjust the position of camera module on the revolving stage according to actual conditions, guarantee that the camera module does not deviate its station. Meanwhile, the embodiment is implemented based on the existing turntable mechanism, that is, the multistation mobile phone camera module detector disclosed in document CN 205377994U.
Particularly, the station of camera module on the revolving stage is located the radial of revolving stage, and photosensitive sensor has been placed to the camera module on the station of revolving stage, and the camera module is just placed on photosensitive sensor. If the position of the camera module on the rotating table does not deviate from the station, namely the camera module is positioned at a normal station, the camera module can just press and block the photosensitive sensor; on the contrary, if the position of the camera module on the rotating platform deviates from the station, the photosensitive sensor is exposed.
The picture acquisition mechanism comprises a camera and a bracket, the camera is fixed on the bracket, the bracket is welded on the rotating table, and the camera is positioned right above the camera module; the lighting mechanism comprises an LED lamp and a lamp holder, the LED lamp is fixed on the lamp holder, the lamp holder is welded on the rotating table, and the LED lamp is positioned right above the camera module; the image recognition module is specifically image recognition software, and the adjustment mechanism includes controller and two cylinders, and two cylinders are located the circumference of revolving stage, and are located the both sides of camera module respectively.
The camera collects the picture of the position of the camera module on the rotating platform, the picture is sent to the picture identification module after collection is finished, and after the picture collected by the camera is received, the picture is identified, and whether black clusters appear in the picture is judged. The black group is also the black part of lacquer in the picture, and this black part of lacquer is because the skew has appeared in the position that the camera module was placed on the revolving stage for the camera module has blocked partial light, thereby the shade that appears.
If appear black group in the picture, show that the skew has appeared in the position that the camera module was placed on the revolving stage, need carry out light compensation, remove the position of camera module simultaneously. When black clusters appear in the picture, the control module controls to switch on a power switch of the LED lamp, and light compensation is carried out on the camera module through light of the LED lamp; and the LED lamp is controlled to illuminate in a half-power state and then in a full-power state, so that the service life of the LED lamp is prolonged. Meanwhile, because the camera module deviates from the station on the rotating table, the photosensitive sensor is exposed, the light of the LED lamp irradiates on the photosensitive sensor, the photosensitive sensor receives the light and sends a signal to the controller, and the controller controls the cylinder to push the camera module to move until the camera module blocks the photosensitive sensor, namely the camera module recovers to the normal station.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A control system for cell-phone camera module detects, its characterized in that includes:
the acquisition module is used for acquiring a picture of the camera module to be detected to obtain an acquired picture;
the pre-judging module is used for judging whether the acquired picture meets the requirements or not according to a preset standard;
the compensation module is used for performing light compensation when the acquired picture does not meet the requirement, and sending a command of acquiring the picture again to the acquisition module after the light compensation is finished; when the collected picture meets the requirements, sending the collected picture;
and the judging module is used for receiving the collected picture, searching the edge profile of the camera area on the collected picture, acquiring the maximum value of the shape function gradient of the edge profile, judging that the camera is normally installed if the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value, and otherwise judging that the camera is abnormally installed.
2. The control system for detecting the camera module of the mobile phone according to claim 1, wherein the light compensation is performed by: detecting the ambient light intensity of the current environment, determining light compensation information according to the ambient light intensity, wherein a light supplementing time period of light compensation and an exposure time period of picture collection have a coincidence time period.
3. The control system for detecting the camera module of the mobile phone according to claim 2, wherein the duration of the coincidence period is longer than a preset duration, and the preset duration is at least an exposure duration of one pixel.
4. The control system for handset camera module detection as claimed in claim 3, wherein the fill-in period completely coincides with the exposure period.
5. The control system for handset camera module detection as claimed in claim 4, wherein the determining module comprises:
the searching unit is used for searching the edge contour of the camera area on the collected picture;
a calculation unit for obtaining a maximum value of a shape function gradient of the edge profile;
and the judging unit is used for judging whether the camera is normally installed according to whether the maximum value of the edge shape function gradient exceeds the preset standard gradient maximum value.
6. The control system for handset camera module detection as claimed in claim 5, wherein the determining module further comprises:
the storage unit is used for pre-storing the characteristic information and the position information of the characteristic area in the standard picture and the position information of the camera area in the standard picture;
and the characteristic unit is used for determining the position information of the characteristic area on the acquired picture according to the characteristic information.
7. The control system for handset camera module detection as claimed in claim 6, wherein the determining module further comprises:
the position comparison unit is used for comparing the characteristic region position information of the standard picture with the characteristic region position information of the collected picture and determining the displacement compensation amount;
and the position compensation unit is used for superposing the displacement compensation quantity and the position information of the camera area in the standard picture to obtain the corrected position information of the camera area on the acquired picture.
8. The control system for handset camera module detection as recited in claim 7, wherein the searching unit is further configured to perform linear search and linear edge contour detection on the camera area image, and set the linear search and linear edge contour detection as the finest pixels.
9. The control system for handset camera module detection as claimed in claim 8, wherein the search unit is further configured to search for edge contours starting from a center of the camera area image.
10. The control system for handset camera module inspection as claimed in claim 9, wherein the standard picture is obtained by taking a camera module that is qualified by manual inspection.
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