CN114157857A - Camera module qualification detection method based on full depth of field - Google Patents
Camera module qualification detection method based on full depth of field Download PDFInfo
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- CN114157857A CN114157857A CN202111283689.XA CN202111283689A CN114157857A CN 114157857 A CN114157857 A CN 114157857A CN 202111283689 A CN202111283689 A CN 202111283689A CN 114157857 A CN114157857 A CN 114157857A
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000012797 qualification Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000012956 testing procedure Methods 0.000 claims description 3
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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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Abstract
The invention discloses a camera module qualification detection method based on full depth of field, which comprises the steps of detecting the definition of a nearest clear point and the definition of a farthest clear point in the range of the depth of field of a camera module, comparing the detected definitions with standard definitions, judging that the camera module is qualified when the detected definitions are greater than the standard definitions, and judging that the camera module is unqualified if the detected definitions are not greater than the standard definitions. According to the method, the end points at two sides of the panoramic depth range of the camera module and the definition of the image acquired at the focus are detected and analyzed, if one definition does not meet the requirement, the camera module is judged to be unqualified, so that the qualification rate of the delivered product is ensured, the method is simple in testing steps, high in efficiency and accurate and reliable in testing result, and 100% of the focus of the camera module qualified through testing can be ensured to be free of problems.
Description
Technical Field
The invention belongs to the technical field of camera shooting, and particularly relates to a camera shooting module qualification detection method based on full depth of field.
Background
The testing process of the camera module comprises the steps of focusing at a specified distance, dispensing and curing, and detecting the resolution and definition of the module at the original focusing distance to judge whether the module is OK or not.
Disclosure of Invention
The invention provides a camera module qualification detection method based on full depth of field, which has the advantages of simple test steps, high test efficiency and high test result accuracy, and ensures that the focus of a camera module subjected to focusing and curing is accurate and error-free.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a camera module qualification detection method based on full depth of field is characterized in that the definition of the nearest clear point and the definition of the farthest clear point in the range of the depth of field of the camera module are detected, the detected definitions are compared with the standard definition respectively, when the detected definitions are larger than the standard definition, the camera module is judged to be qualified, and otherwise, the camera module is judged to be unqualified.
Further, the method also comprises the steps of detecting the definition of the focus in the range of the depth of field of the camera module, comparing the definition of the focus with the standard definition, and judging the focus to be qualified when the detected definition is larger than the standard definition, or judging the focus to be unqualified.
A camera module qualification detection method based on full depth of field comprises the following steps:
s1, connecting the camera module with the detection equipment, fixing the camera module and arranging a test drawing with an adjustable position on one side of a lens of the camera module;
s2, calculating a depth of field range according to the characteristics of the camera module, wherein the depth of field is a distance range within which the camera module can acquire clear images, a clear point closest to a lens is set as A, a focus is set as B, a clear point farthest from the lens is set as C, the depth of field is AC, and B is located between the AC;
s3, adjusting the position of the test drawing to an opposite focus B, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is larger than the standard definition, judging the definition to be qualified, continuing the next step, otherwise, judging the definition to be unqualified;
s4, adjusting the position of the test drawing to the nearest clear focus A, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is greater than the standard definition, judging that the test drawing is qualified, continuing the next step, and otherwise, judging that the test drawing is unqualified;
s5, adjusting the position of the test drawing to the farthest clear focus C, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is larger than the standard definition, judging that the test drawing is qualified, continuing the next step, and otherwise, judging that the test drawing is unqualified;
s6, judging that the camera module is qualified, and entering other testing procedures or entering a packaging procedure;
further, when the camera module is determined to be unqualified in the step S3, the step S4 or the step S5, the camera module enters a repair process, the repaired camera module repeats the tests in the steps S3 to S5, and if the camera module is determined to be unqualified in the steps S3 to S5, the camera module is continuously repaired or directly scrapped.
Furthermore, if the number of times of repairing the camera module after entering the repairing process reaches 2 to 3 times, the camera module is rejected if the camera module is judged to be still unqualified in the steps S3 to S5.
Furthermore, the detection equipment is a computer for storing test software, the computer is connected with the camera module, images shot by the camera module are sequentially obtained according to the test software, the definition of the images is obtained through built-in definition measuring software, the definition is compared with the preset standard definition, and a comparison result is given.
Furthermore, the position-adjustable test drawing means that the test drawing is fixed on a position adjusting mechanism, the adjusting mechanism comprises a rack, a screw and nut mechanism fixedly mounted on the rack, and a screw driving motor, and the test drawing is fixed on a nut through a drawing frame.
Preferably, the driving motor is a stepping motor.
Preferably, the stepping motor is controlled by a computer, and the computer is used for detecting the camera module.
Preferably, the camera module is fixed on the frame through the module fixing frame, a dimension line is arranged on the frame, and the test drawing is located at the position of 0 on the right side of the dimension line when the camera module is started.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the method, the end points at two sides of the panoramic depth range of the camera module and the definition of the image acquired at the focus are detected and analyzed, if one definition does not meet the requirement, the camera module is judged to be unqualified, so that the qualification rate of the delivered product is ensured, the method is simple in testing steps, high in efficiency and accurate and reliable in testing result, and 100% of the focus of the camera module qualified through testing can be ensured to be free of problems.
Drawings
FIG. 1 is a schematic diagram of the camera module adjustment of the present invention;
FIG. 2 is a schematic structural diagram of a testing apparatus according to the present invention;
wherein: 1. the camera module 2, size line, 3, frame, 4, driving motor, 5, test drawing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a method for detecting a finished product camera module, which can be used for detecting the definition of the full depth of field of the camera module, and easily judging whether a focus of the camera module is correct after focusing and solidifying, thereby judging whether the module is qualified.
Examples
For a camera module with a fixed focal length, the field depth range is also fixed, and the nearest clear point and the farthest clear point in the field depth range are also fixed. Therefore, the method of the invention detects the definition of the nearest clear point and the definition of the farthest clear point in the field depth range of the camera module, compares the detected definitions with the standard definitions respectively, and judges as qualified when the detected definitions are all larger than the standard definitions, or judges as unqualified.
In order to ensure that the definition in the panoramic depth range is not problematic and the focus is accurate, the method further comprises the steps of detecting the definition of the focus in the depth range of the camera module, comparing the definition of the focus with the standard definition, and judging that the focus is qualified when the detected definition is greater than the standard definition, or judging that the focus is unqualified.
Based on the method, the invention comprises the following steps:
s1, connecting the camera module with the detection equipment, fixing the camera module and arranging a test drawing with an adjustable position on one side of a lens of the camera module;
s2, calculating a depth of field range according to the characteristics of the camera module, wherein the depth of field is a distance range within which the camera module can acquire clear images, a clear point closest to a lens is set as A, a focus is set as B, a clear point farthest from the lens is set as C, the depth of field is AC, and B is located between the AC; the focusing schematic diagram of the camera shooting module is shown in fig. 1, the camera shooting module performs focusing by taking a point B as a focusing distance during actual focusing, and the point B is a focus during testing.
S3, adjusting the position of the test drawing to an opposite focus B, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is larger than the standard definition, judging the definition to be qualified, continuing the next step, otherwise, judging the definition to be unqualified;
s4, adjusting the position of the test drawing to the nearest clear focus A, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is greater than the standard definition, judging that the test drawing is qualified, continuing the next step, and otherwise, judging that the test drawing is unqualified;
s5, adjusting the position of the test drawing to the farthest clear focus C, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is larger than the standard definition, judging that the test drawing is qualified, continuing the next step, and otherwise, judging that the test drawing is unqualified;
s6, judging that the camera module is qualified, and entering other testing procedures or entering a packaging procedure;
in the above steps, when the camera module is determined to be unqualified in step S3 or step S4 or step S5, the camera module enters a repair process, the repaired camera module repeats the tests in steps S3-S5, and if the camera module is determined to be unqualified in steps S3-S5, the camera module continues to be repaired or is directly scrapped.
In order to prevent the camera module from being repeatedly repaired due to disqualification caused by the structure, the device and the like, if the number of times of repairing the camera module after entering the repairing process reaches 2 to 3 times and the camera module is judged to be still not qualified in the steps S3 to S5, the camera module is scrapped.
For the invention, in order to realize automatic testing and improve testing efficiency, the detection equipment is a computer storing testing software, the computer is connected with the camera module, images shot by the camera module are sequentially obtained according to the testing software, the definition of the images is obtained through built-in definition measuring software, and is compared with the preset standard definition, and a comparison result is given.
The position-adjustable test drawing is that a test drawing 5 is fixed on a position adjusting mechanism, the adjusting mechanism comprises a rack 3, a screw rod nut mechanism fixedly mounted on the rack and a screw rod driving motor 4, and the test drawing is fixed on a nut through a drawing rack.
In a preferred embodiment of the present invention, the driving motor is a stepping motor.
In a preferred embodiment of the present invention, the stepping motor is controlled by a computer, and the computer is a computer for detecting the camera module.
As a preferred embodiment of the present invention, the camera module 1 is fixed on the frame 3 through a module fixing frame, the frame is provided with a dimension line 2, and the test drawing is located at the position 0 on the right side of the dimension line at the beginning.
Because during testing, a batch of modules with the same model are generally tested, after the equipment is debugged, the test can be carried out all the time without readjusting and setting parameters, and the test efficiency is high.
Claims (10)
1. A camera module qualification detection method based on full depth of field is characterized in that: the method comprises the steps of detecting the definition of the nearest clear point and the definition of the farthest clear point in the field depth range of the camera module, comparing the detected definitions with standard definitions, judging that the definition is qualified when the detected definitions are larger than the standard definitions, and judging that the definition is unqualified when the detected definitions are not larger than the standard definitions.
2. The camera module qualification detection method based on the full depth of field according to claim 1, characterized in that: the method further comprises the steps of detecting the definition of the focus in the range of the depth of field of the camera module, comparing the definition of the focus with the standard definition, judging the focus to be qualified when the detected definition is larger than the standard definition, and otherwise judging the focus to be unqualified.
3. The full-depth-of-field-based camera module qualification detection method according to claim 2, comprising the following steps:
s1, connecting the camera module with the detection equipment, fixing the camera module and arranging a test drawing with an adjustable position on one side of a lens of the camera module;
s2, calculating a depth of field range according to the characteristics of the camera module, wherein the depth of field is a distance range within which the camera module can acquire clear images, a clear point closest to a lens is set as A, a focus is set as B, a clear point farthest from the lens is set as C, the depth of field is AC, and B is located between the AC;
s3, adjusting the position of the test drawing to an opposite focus B, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is larger than the standard definition, judging the definition to be qualified, continuing the next step, otherwise, judging the definition to be unqualified;
s4, adjusting the position of the test drawing to the nearest clear focus A, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is greater than the standard definition, judging that the test drawing is qualified, continuing the next step, and otherwise, judging that the test drawing is unqualified;
s5, adjusting the position of the test drawing to the farthest clear focus C, obtaining the definition of the test drawing, comparing the definition with the standard definition, if the definition is larger than the standard definition, judging that the test drawing is qualified, continuing the next step, and otherwise, judging that the test drawing is unqualified;
and S6, judging that the camera module is qualified, and entering other testing procedures or entering a packaging procedure.
4. The camera module qualification detection method based on the full depth of field according to claim 3, characterized in that: and when the camera module is judged to be unqualified in the step S3 or the step S4 or the step S5, the camera module enters a repairing process, the repaired camera module repeats the tests in the steps S3-S5, and if the camera module is judged to be unqualified in the steps S3-S5, the camera module is continuously repaired or directly scrapped.
5. The camera module qualification detection method based on the full depth of field according to claim 4, characterized in that: if the number of times of repairing the camera module after entering the repairing process reaches 2-3 times, the camera module is rejected if the camera module is judged to be still unqualified in the steps S3-S5.
6. The camera module qualification detection method based on full depth of field according to any one of claims 3 to 5, characterized in that: the detection equipment is a computer for storing test software, the computer is connected with the camera module, images shot by the camera module are sequentially obtained according to the test software, the definition of the images is obtained through built-in definition measuring software, the definition is compared with the preset standard definition, and a comparison result is given.
7. The camera module qualification detection method based on the full depth of field according to claim 6, characterized in that: the position-adjustable test drawing is that the test drawing is fixed on a position adjusting mechanism, the adjusting mechanism comprises a rack, a screw rod nut mechanism and a screw rod driving motor, the screw rod nut mechanism is fixedly installed on the rack, and the test drawing is fixed on a nut through a drawing frame.
8. The camera module qualification detection method based on the full depth of field according to claim 1, characterized in that: the driving motor is a stepping motor.
9. The camera module qualification detection method based on the full depth of field according to claim 1, characterized in that: the stepping motor is controlled by a computer, and the computer is used for detecting the camera module.
10. The camera module qualification detection method based on the full depth of field according to claim 1, characterized in that: the camera module is fixed on the frame through the module fixing frame, the frame is provided with a dimension line, and the test drawing is located at the position 0 on the right side of the dimension line in the beginning.
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| CN202111283689.XA CN114157857A (en) | 2021-11-01 | 2021-11-01 | Camera module qualification detection method based on full depth of field |
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