CN113766213A - Method for improving AF burning parameter detection efficiency of camera module - Google Patents
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- H—ELECTRICITY
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- 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 method for improving the detection efficiency of AF burning parameters of a camera module, which takes an AF burning value compensated by offset as an initial search value, detects and acquires AF detection parameters and compares the AF burning parameters to determine whether the AF burning parameters are correct, wherein the offset compensation value is a threshold value required by a customer, the threshold value required by the customer is an absolute value of the maximum +/-allowable difference, and the +/-allowable difference refers to the difference of the AF burning parameters relative to the AF detection parameters. According to the method, offset compensation is carried out on the read AF burning value by using the threshold value required by a client, the AF detection parameter is obtained again by using the compensated value as the initial search value, the time for collecting data (obtaining the optimal focusing position) in the early stage can be greatly reduced, the situation that the initial search value exceeds the burning value and further causes that a clear point of a negative direction stroke cannot be searched and returns to re-search is avoided, the detection efficiency is greatly improved, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of camera shooting, and particularly relates to a method for improving the detection efficiency of AF burning parameters of a camera shooting module.
Background
The camera is used as an image input device, is widely applied to the fields of camera shooting, mobile phone video, security monitoring and the like, and obtains people in the thousands of worlds, and information such as scenery is obtained by the camera module. The automatic focusing function meets the requirement that consumers pursue clear image quality and focusing speed at different distances, and then the normal realization and use of the function need to burn code (current) values corresponding to far, medium and close scenes and the like before the camera module factory leaves a factory, and then the burning parameters are judged once at the final detection stage of shipment. The current detection stage method is to collect and store the code values of the inside long shot in the early burning stage, then to set the average value of all burned long shot code values as the initial search value of the detection section, because of the slight difference of different shooting modules in the aspects of process and the like, the focusing time can be accelerated to a certain extent by using the average value as the initial search value, but the collected data can increase a certain time, and meanwhile, the condition that the initial search value is greater than the burning value is difficult to avoid by using the average value as the initial search value, the clear point of the negative direction stroke can not be searched due to the condition that the initial search value is greater than the burning value, and finally the clear point needs to be returned for searching again, if the consistency of the shooting modules is not good, the final detection efficiency can be greatly reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for shortening the detection time and improving the detection efficiency of the AF burning parameters of the camera module, so that the return re-search which cannot be searched by the clear point of the negative direction stroke is avoided, and the detection efficiency is greatly improved.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a method for improving the AF burning parameter detection efficiency of a camera module comprises the following steps: the AF burning value compensated by the offset is used as an initial search value, the AF detection parameter is detected and obtained and compared with the AF burning parameter to determine whether the AF burning parameter is correct, the offset compensation value is a threshold value required by a customer, the threshold value required by the customer is an absolute value of the maximum +/-allowed difference, and the +/-allowed difference refers to the difference of the AF burning parameter relative to the AF detection parameter.
The method comprises the following steps:
s1, reading a code value OTP _ code of the AF burning parameters of the current camera module;
s2, performing offset compensation on the read code value, and taking the compensated code value as an initial search value Star _ code;
s3, re-acquiring the AF detection parameters of the current camera module by the method for acquiring the AF burning parameters, and finally obtaining a code value Test _ code corresponding to the AF detection parameters;
and S4, calculating the difference between the Test _ code and the OTP _ code, and when the absolute value of the difference is less than or equal to the threshold required by the client, indicating that the AF burning parameters of the camera module are correct, otherwise, indicating that the AF burning parameters are incorrect.
Further, the method further includes step S5, when the AF burning parameters are incorrect, burning the AF detection parameters obtained in step S3 into the current camera module, and repeating steps S1-S4.
Further, the number of times of repeating the steps S1-S4 in the step S5 is not more than 2, and when the number of times of repeating the steps S1-S4 reaches 2 times and the AF recording parameters are still incorrect, the current camera module is returned to the production assembly process for refurbishment.
Further, the AF burning parameters include a long-range focusing position parameter, a middle-range focusing position parameter, and a short-range focusing position parameter, and the long-range focusing position parameter, the middle-range focusing position parameter, and the short-range focusing position parameter are all burned in the memory of the camera module in the form of code values.
Preferably, the code value OTP _ code read in step S1 is a long-range code value of the current camera module, and corresponds to the long-range focusing position parameter; the start search value Star _ code in step S2 is a Star _ code-OTP _ code threshold.
Preferably, the code value OTP _ code read in step S1 is a middle view code value of the current camera module, and corresponds to a middle view focus position parameter; the start search value Star _ code in step S2 is a Star _ code OTP _ code threshold or a Star _ code OTP _ code + threshold.
Preferably, the code value OTP _ code read in step S1 is a close-range code value of the current camera module, and corresponds to a close-range focusing position parameter; the start search value Star _ code in the step S2 is Star _ code — OTP _ code + threshold.
Further, when the AF detection parameters are acquired again in Step S3, focus tests are performed successively according to the focus movement Step _ code on the basis of the start search value Star _ code to acquire the optimal focus position, and then Test _ code is acquired.
Preferably, the focus movement Step distance Step _ code is much smaller than a threshold value.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the method, offset compensation is carried out on the read AF burning value by using the threshold value required by a client, the AF detection parameter is obtained again by using the compensated value as the initial search value, the time for collecting data (obtaining the optimal focusing position) in the early stage can be greatly reduced, the situation that the initial search value exceeds the burning value and further causes that a clear point of a negative direction stroke cannot be searched and returns to re-search is avoided, the detection efficiency is greatly improved, and the cost is saved.
Detailed Description
The invention is described in further detail below with reference to examples:
the invention relates to a method for detecting AF burning parameters of a camera module before leaving a factory, in particular to a method for detecting AF burning parameters with improved detection efficiency. The method eliminates the situation that the prior clear point of the negative direction travel cannot be searched but returns to re-search due to the fact that the average value is taken as the initial search point, and greatly improves the detection efficiency.
The AF burning parameter detection method comprises the following steps: the AF burning value compensated by offset is used as an initial search value, the AF detection parameter and the AF burning parameter are detected and obtained to be compared, whether the AF burning parameter is correct or not is determined, the offset compensation value is a threshold value required by a customer, the threshold value required by the customer is an absolute value of the maximum +/-allowed difference, the +/-allowed difference refers to the difference of the AF burning parameter relative to the AF detection parameter, and the judgment standard for the correctness of the AF burning parameter is whether the difference of the AF detection parameter and the AF burning parameter is within the threshold value range required by the customer or not.
Example (b):
the method comprises the following steps:
s1, reading a code value OTP _ code of the AF burning parameters of the current camera module; the AF burning parameters comprise a long-range focusing position parameter, a middle-range focusing position parameter and a short-range focusing position parameter, and the long-range focusing position parameter, the middle-range focusing position parameter and the short-range focusing position parameter are burnt in a memory of the camera module in a code value mode.
S2, performing offset compensation on the read code value, and taking the compensated code value as an initial search value Star _ code;
s3, taking the initial search value Star _ code in the step 2 as an initial search point, searching for AF parameters by a method for obtaining AF burning parameters, obtaining AF detection parameters of the current camera module again, and finally obtaining a code value Test _ code corresponding to the AF detection parameters after conversion;
s4, calculating the difference between the Test _ code and the OTP _ code, and when the absolute value of the difference is less than or equal to the threshold required by the client, namely | Test _ code-OTP _ code | is less than or equal to the threshold, indicating that the AF burning parameters of the camera module are correct, otherwise, the AF burning parameters are incorrect.
In practical application, after the AF burning parameters of the camera module are judged, if the AF burning parameters are correct, a subsequent packaging procedure can be entered. If the AF burning parameters are incorrect, the camera module is processed according to a normal procedure to reduce the rejection rate of the camera module, for the invention, after the judgment is finished, the step S5 is entered, when the AF burning parameters are incorrect, the AF detection parameters obtained in the step S3 are burned into the current camera module, and the steps S1-S4 are repeated, namely, burning and detecting are carried out again. If the recording and detection are not qualified, the camera module may have other hardware or assembly problems and needs to be returned for refurbishment. For the invention, in order to prevent the erroneous judgment caused by inaccurate detection, the number of times of repeating the steps S1-S4 in the step S5 is not more than 2, and when the number of times of repeating the steps S1-S4 reaches 2 and the AF burning parameters are still incorrect, the current camera module is returned to the production assembly process for renovation.
During the detection of the actual AF burning parameters, the recorded long-range focusing position parameters, middle-range focusing position parameters, close-range focusing position parameters and the like are detected in the detection stage, and the parameters are detected by adopting the method in the invention. When detecting the long-range view parameter, the code value OTP _ code read in the step S1 is the long-range view code value of the current camera module, and corresponds to the long-range view focus position parameter; the initial search value Star _ code in step S2 is the Star _ code-OTP _ code threshold, because the long-range code value corresponds to a code value with a large value in the focus range, and if the threshold is added, the code value will exceed the burning value, so the threshold subtraction calculation method of the above formula is adopted.
When detecting the long-range view parameter, the code value OTP _ code read in the step S1 is the middle-range view code value of the current camera module, and corresponds to the middle-range focus position parameter; the start search value Star _ code in step S2 may be an Star _ code — OTP _ code threshold, or an Star _ code — OTP _ code + threshold, and no matter which start search value Star _ code is used, the start search value does not exceed the burning value, so that the situation of returning to re-search due to the fact that the clear point of the negative direction trip cannot be searched is avoided.
When detecting the close-range parameter, the code value OTP _ code read in the step S1 is the close-range code value of the current camera module, and corresponds to the close-range focusing position parameter; the initial search value Star _ code in step S2 is Star _ code ═ OTP _ code + threshold value, because the near field code value corresponds to a code value with a smaller value in the focus range, and if a threshold value is decreased, the code value will exceed the burning value, so the threshold value adding calculation method of the above formula is adopted.
Such as: if the threshold value required by the client is 30 (the code value corresponding to the maximum stroke of the voice coil motor is 1 to 1024, which may be other values), the long-range start search value Star _ code is OTP _ code-30, the medium-range start search value Star _ code is OTP _ code-30, or the Star _ code is OTP _ code +30, and the near-range start search value Star _ code is OTP _ code + 30.
The threshold is the accuracy requirement of a client on the focusing parameter of the camera module, is given by the client and is related to the client requirement, but does not depart from the development and progress direction of the technology, and the accuracy is certainly relatively high.
When the long-range focus position parameter, the middle-range focus position parameter, and the short-range focus position parameter are detected, the recorded long-range code, middle-range code, and short-range code are read and the initial search value Star _ code is calculated, and the initial search value is used to search for the long-range code, middle-range code, and short-range code, but multiple times of focus tests are required to obtain the best focus position, so when the AF detection parameter is obtained again in Step S3, the best focus position is obtained by performing focus tests in sequence according to the focus movement Step distance stepcode on the basis of the initial search value Star _ code, and then the Test _ code is obtained. Wherein the focus movement Step distance Step _ code is far smaller than a threshold value. The minimum focus movement Step _ code may be 1, or may be 2, 4, 5, 8, or other steps, and the Step may be selected and determined according to the code value (for example, 1 to 1024) of the focus range (the maximum stroke of the voice coil motor), and is defined by the engineer according to the specific situation, and is not limited specifically.
Claims (10)
1. A method for improving the AF burning parameter detection efficiency of a camera module comprises the following steps: the AF burning value compensated by the offset is used as an initial search value, the AF detection parameter is detected and obtained and compared with the AF burning parameter to determine whether the AF burning parameter is correct, the offset compensation value is a threshold value required by a customer, the threshold value required by the customer is an absolute value of the maximum +/-allowed difference, and the +/-allowed difference refers to the difference of the AF burning parameter relative to the AF detection parameter.
2. The method for improving the detection efficiency of the AF burning parameters of the camera module as claimed in claim 1, comprising the steps of:
s1, reading a code value OTP _ code of the AF burning parameters of the current camera module;
s2, performing offset compensation on the read code value, and taking the compensated code value as an initial search value Star _ code;
s3, re-acquiring the AF detection parameters of the current camera module by the method for acquiring the AF burning parameters, and finally obtaining a code value Test _ code corresponding to the AF detection parameters;
and S4, calculating the difference between the Test _ code and the OTP _ code, and when the absolute value of the difference is less than or equal to the threshold required by the client, indicating that the AF burning parameters of the camera module are correct, otherwise, indicating that the AF burning parameters are incorrect.
3. The method as claimed in claim 2, further comprising step S5, when the AF burning parameters are incorrect, burning the AF detection parameters obtained in step S3 into the current camera module, and repeating steps S1-S4.
4. The method of claim 3, wherein the method comprises the following steps: and in the step S5, the times of repeating the steps S1-S4 are not more than 2, and when the steps S1-S4 are repeated for 2 times and the AF burning parameters are still incorrect, the current camera module is returned to the production assembly process for renovation.
5. The method for improving the detection efficiency of the AF burning parameters of the camera module according to any one of claims 1 to 4, wherein: the AF burning parameters comprise a long-range focusing position parameter, a middle-range focusing position parameter and a short-range focusing position parameter, and the long-range focusing position parameter, the middle-range focusing position parameter and the short-range focusing position parameter are burnt in a memory of the camera module in a code value mode.
6. The method for improving the detection efficiency of the AF burning parameters of the camera module according to any one of claims 2 to 4, wherein: the code value OTP _ code read in step S1 is a long-range code value of the current camera module, and corresponds to a long-range focus position parameter; the start search value Star _ code in said step S2 is Star _ code = OTP _ code-threshold.
7. The method for improving the detection efficiency of the AF burning parameters of the camera module according to any one of claims 2 to 4, wherein: the code value OTP _ code read in step S1 is the middle view code value of the current camera module, and corresponds to the middle view focus position parameter; the start search value Star _ code in the step S2 is Star _ code = OTP _ code-threshold or Star _ code = OTP _ code + threshold.
8. The method for improving the detection efficiency of the AF burning parameters of the camera module according to any one of claims 2 to 4, wherein: the code value OTP _ code read in step S1 is the close-range code value of the current camera module, and corresponds to the close-range focusing position parameter; the start search value Star _ code in the step S2 is Star _ code = OTP _ code + threshold.
9. The method for improving the detection efficiency of the AF burning parameters of the camera module according to any one of claims 2 to 4, wherein: when the AF detection parameters are acquired again in Step S3, focus tests are performed successively according to the focus movement Step size Step _ code on the basis of the initial search value Star _ code to acquire the optimal focus position, and then Test _ code is acquired.
10. The method of claim 9, wherein the method comprises the following steps: the focus movement Step size Step _ code is much smaller than a threshold value.
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