CN104093016B - A kind of dirty detection method of camera module and system - Google Patents
A kind of dirty detection method of camera module and system Download PDFInfo
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Abstract
The invention discloses the dirty detection method of a kind of camera module, comprise the following steps: (1) connects camera module to module data acquisition module, and covers whole camera view scope with white covering plate; (2) camera module carries out IMAQ, and module data acquisition module reads shutter image and is stored to the buffer area of module data acquisition module; (3) by white shutter image transmitting to the dirty detection module internal memory of host computer; (4) the dirty detection module of host computer carries out dirty detection to white shutter image.Present invention achieves and automatically detect camera module is dirty, improve the dirty detection efficiency of camera module and accuracy rate.
Description
Technical field
The present invention relates to the dirty detection technique of optical camera, particularly the dirty detection method of a kind of camera module and system.
Background technology
The camera that the present invention is directed to mainly is applied to the built-in camera module of the digital products such as mobile phone.This kind of camera is most not to be possessed optical zoom function, structure is simple and has the darker depth of field.In actual production assembling process, the foreign matter such as dust, hair is fallen on module sensitive chip, and therefore module is before dispatching from the factory, and needs to carry out dirty detection after namely having assembled, to ensure that camera module visual field in real work does not affect by dirty point; In addition, the sensor model number of camera module is many, is compatible multiple sensors, needs to set up a kind of general image capture module and obtains image to complete dirty detection.
At present, the dirty detection of camera module is still by manually completing.Image acquisition circuit connect camera, from camera module acquisition of image data and be sent to PC end show, workman at the white shelter of cam lens protecgulum one, according to camera generate image carry out dirty differentiation.Although artificial dirty detection method can meet the production requirement of factory, also there is drawback.First, the camera module daily output is large, and workman's repeated observation white covering plate image easily produces visual fatigue.Secondly, because dirty size is little, in camera module optical imaging system, easily because the diffraction of light makes dirtyly to generate ill-defined dull areas in final digital picture, or the dirty corner being sometimes in visual field, be difficult to differentiate with dark angle, thus make some dirty naked eyes be difficult to discover at short notice, reduce the qualification rate of product.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art with not enough, the object of the present invention is to provide the dirty detection method of a kind of camera module, realizing automatically detecting camera module is dirty, improving the dirty detection efficiency of camera module and accuracy rate.
Another object of the present invention is to provide a kind of camera module dirty detection system.
Object of the present invention is achieved through the following technical solutions:
The dirty detection method of a kind of camera module, comprises the following steps:
(1) connect camera module to module data acquisition module, and cover whole camera view scope with white covering plate;
(2) camera module carries out IMAQ, and module data acquisition module reads shutter image and is stored to the buffer area of module data acquisition module;
(3) by white shutter image transmitting to the dirty detection module internal memory of host computer;
(4) the dirty detection module of host computer carries out dirty detection to white shutter image:
(4-1) background modeling is carried out to white shutter image, background modeling gained model image is carried out phase reducing with original image, obtains dim edge image;
(4-2) on dim edge image, carry out border circular areas to search;
(4-3) judge whether to exist dirty: if find border circular areas, then judge that camera module is defective; If can not find border circular areas, judge that camera module is qualified.
Step (2) described by the white shutter image reading that collects to the buffer area of module data acquisition module, be specially:
Module data acquisition module traversal module database, searches out the module parameter matched with camera module, by module parameter read-in in each register of the transducer of camera module; Module data acquisition module obtains image with constant frame per second from camera module and is stored into the buffer area of module data acquisition module.
Step (4-1) described background modeling, is specially:
Be the image slices vegetarian refreshments of 0.2 ~ 0.3 times of original image pixel sum by random specified quantity, background is considered as two-dimentional continuous function, the gray value according to pixel carries out least square method Background fitting, generation model image.
The described phase reducing of step (4-1), is specially:
The value of model image and each pixel of original image is carried out additive operation, draws the result of subtracting each other.
Described border circular areas is searched, and is specially:
Using need follow the tracks of shape as template, to region equal with template size each in image, utilize the similarity in normalized crosscorrelation calculation template and this region, by shape similarity higher than setting threshold extracted region out.
The system of the dirty detection method of camera module, comprises
Camera module, for gathering white shutter image; When gathering white shutter image, white covering plate covers whole camera view scope;
Module data acquisition module, is electrically connected with camera module; For reading and storing white shutter image;
Host computer, is connected by connecting line with module data acquisition module; For carrying out background modeling to white shutter image, background modeling gained modeled images and original image being carried out contrast difference, obtains dim edge image; By searching dim edge image carrying out border circular areas, judge that whether camera module is qualified.
Compared with prior art, the present invention has the following advantages and beneficial effect:
(1) present invention achieves and automatically detect camera module is dirty, improve the dirty detection efficiency of camera module and accuracy rate, effectively improve accuracy and the speed of the dirty detection of camera, greatly alleviate the work load of workman.
(2) the compatible Multiple Type transducer of module data acquisition module energy of the present invention, the test job for camera module provides convenient.
(3) in prior art, need repeatedly to carry out dirty detection to ensure qualification rate to camera module, application the present invention can save the number of repetition of the dirty detection of camera module, enhances productivity.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the dirty detection system of camera module that embodiments of the invention adopt.
Fig. 2 is the flow chart of the dirty detection method of camera module of embodiments of the invention.
Fig. 3 is the flow chart of the dirty testing process of embodiments of the invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the dirty detection system of camera module that the present embodiment adopts, comprises host computer 1, the dirty detection servicing unit 2 of camera module, camera module 3 and module data acquisition module 4; The dirty detection servicing unit of camera module, comprises camera module fixing device, the electrical connection of camera module interface, white shutter and relevant mechanical connection component.
Described camera module is for gathering white shutter image; When gathering white shutter image, white covering plate covers whole camera view scope, and available hand-held or machine action covers, and its placement location should as far as possible near the camera lens of camera module, to obtain the pure detected image of light scattering as far as possible; Module data acquisition module is used for reading and storing white shutter image, realizes being electrically connected with camera module by camera module electrical connection interface; Host computer, module data acquisition module is connected by connecting line; For carrying out background modeling to white shutter image, background modeling gained model image and original image being carried out contrast difference, obtains dim edge image; By searching dim edge image carrying out border circular areas, judge that whether camera module is qualified.
Host computer can be the digital system that computer, embedded system or framework are close.Host computer also comprises user input device and display device, and input equipment used comprises mouse and keyboard, and display device used comprises computer display screen, LCDs etc.
As shown in Figure 2, the dirty detection method of camera module of the present embodiment, comprises the following steps:
(1) connect camera module to module data acquisition module, and cover whole camera view scope with white covering plate;
(2) camera module carries out IMAQ, module data acquisition module reads shutter image and is stored to the buffer area of module data acquisition module, be specially: module data acquisition module traversal module database, search out the module parameter matched with camera module, by module parameter read-in in each register of the transducer of camera module; Module data acquisition module obtains image with constant frame per second from camera module and is stored into the buffer area of module data acquisition module.
(3) by white shutter image transmitting to the dirty detection module internal memory of host computer;
(4) the dirty detection module of host computer carries out dirty detection to white shutter image, and as shown in Figure 3, dirty testing process is specially:
(4-1) background modeling is carried out to white shutter image, background modeling gained model image is carried out phase reducing with original image, obtains dim edge image;
Described background modeling, is specially: by random amount be 0.2 ~ 0.3 times of original image pixel sum image slices vegetarian refreshments, background is considered as two-dimentional continuous function, and the gray value according to pixel carries out least square method Background fitting, generation model image;
Described phase reducing, is specially: the value of model image and each pixel of original image is carried out additive operation, draws the result of subtracting each other.
(4-2) on dim edge image, carry out border circular areas to search;
Described border circular areas is searched, specifically to need the shape of following the tracks of as template, to region equal with template size each in image, utilize the similarity in normalized crosscorrelation calculation template and this region, by shape similarity higher than setting threshold extracted region out.
(4-3) judge whether to exist dirty: if find border circular areas, then there is dirty some block in camera module, judge that camera module is defective, and rule of thumb data calculates dirty some position; If can not find border circular areas, judge that camera module is qualified.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. the dirty detection method of camera module, is characterized in that, comprise the following steps:
(1) connect camera module to module data acquisition module, and cover whole camera view scope with white covering plate;
(2) camera module carries out IMAQ, and module data acquisition module reads shutter image and is stored to the buffer area of module data acquisition module;
(3) by white shutter image transmitting to the dirty detection module internal memory of host computer;
(4) the dirty detection module of host computer carries out dirty detection to white shutter image:
(4-1) background modeling is carried out to white shutter image, background modeling gained model image is carried out phase reducing with original image, obtains dim edge image;
Described background modeling, is specially:
Be the image slices vegetarian refreshments of 0.2 ~ 0.3 times of original image pixel sum by random specified quantity, background is considered as two-dimentional continuous function, the gray value according to pixel carries out least square method Background fitting, generation model image;
(4-2) on dim edge image, carry out border circular areas to search; Described border circular areas is searched, and is specially:
Using need follow the tracks of shape as template, to region equal with template size each in image, utilize the similarity in normalized crosscorrelation calculation template and this region, by shape similarity higher than setting threshold extracted region out;
(4-3) judge whether to exist dirty: if find border circular areas, then judge that camera module is defective; If can not find border circular areas, judge that camera module is qualified.
2. the dirty detection method of camera module according to claim 1, is characterized in that, step (2) described by the white shutter image reading that collects to the buffer area of module data acquisition module, be specially:
Module data acquisition module traversal module database, searches out the module parameter matched with camera module, by module parameter read-in in each register of the transducer of camera module; Module data acquisition module obtains image with constant frame per second from camera module and is stored into the buffer area of module data acquisition module.
3. the dirty detection method of camera module according to claim 1, is characterized in that, the described phase reducing of step (4-1), is specially:
The value of model image and each pixel of original image is carried out additive operation, draws the result of subtracting each other.
4. realize the system of the dirty detection method of camera module according to claim 1, it is characterized in that, comprise
Camera module, for gathering white shutter image; When gathering white shutter image, white covering plate covers whole camera view scope;
Module data acquisition module, is electrically connected with camera module; For reading and storing white shutter image;
Host computer, is connected by connecting line with module data acquisition module; For carrying out background modeling to white shutter image, background modeling gained modeled images and original image being carried out contrast difference, obtains dim edge image; By searching dim edge image carrying out border circular areas, judge that whether camera module is qualified.
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