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Distortion calibration method, system and device for lens module and storage medium

A distortion calibration and lens module technology, applied in image analysis, instrumentation, computing, etc., can solve the problem of not being able to take into account the needs of large-scale mass production and high efficiency and high precision, and achieve the effect of taking into account the effect of distortion correction and production efficiency.

Active Publication Date: 2021-03-09
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the distortion calibration of the lens module in the prior art cannot take into account the needs of large-scale mass production and high efficiency and high precision, and provides Distortion calibration method, system, device and storage medium for lens module

Method used

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  • Distortion calibration method, system and device for lens module and storage medium
  • Distortion calibration method, system and device for lens module and storage medium
  • Distortion calibration method, system and device for lens module and storage medium

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A method for calibrating distortion of a lens module, such as figure 1 As shown, the distortion calibration method includes:

[0057] Step 10. Select a preset number of target modules; in practical applications, in order to ensure more accurate calibration parameters, the selected number of target modules is generally not less than 200.

[0058] Step 20, calculate the distortion deviation of each target module, and then perform step 30; the distortion deviation is used to characterize the deviation between the distortion correction mapping grid of each target module and the average distortion correction mapping grid of all target modules ;

[0059] Among them, such as figure 2 As shown, step 20 specifically includes:

[0060] Step 201, calibrate each target module to obtain distortion calibration parameters;

[0061] In this embodiment, the calibration result of the ultra-wide-angle module includes: the camera internal parameter matrix and the distortion coefficient:...

Embodiment 2

[0086] This embodiment is a further improvement on the basis of Embodiment 1. The radial distortion is caused by the design of the optical lens. Its characteristic is that the optical center is the circle point and the distortion becomes more and more serious along the radial direction, while the tangential distortion coefficient is Due to the manufacturing process, such distortion is usually small for modules with better quality. It can be seen that whether the position of the optical center is accurate has a significant impact on the distortion correction effect. If the position of the optical center is inaccurate, establish a The coordinate mapping of will no longer be accurate. When applying distortion correction parameters to any other module for distortion correction, in order to obtain a more ideal distortion correction effect, it is necessary to correct the deviation of the optical center.

[0087] In this embodiment, the distortion calibration parameters of each target...

Embodiment 3

[0097] A distortion calibration system for lens modules, such as Figure 5 As shown, the distortion calibration system includes:

[0098] The target selection module 1 is used to select a preset number of target modules; in practical applications, in order to ensure more accurate calibration parameters, the selected number of target modules is generally not less than 200.

[0099]The distortion deviation calculation module 2 is used to calculate the distortion deviation of each target module, and the distortion deviation is used to characterize the deviation between the distortion correction mapping grid of each target module and the average distortion correction mapping grid of all target modules ;

[0100] The elimination module 3 is used to eliminate the modules whose distortion deviation is greater than the preset threshold, and call the distortion deviation calculation module 2 to calculate the update distortion deviation of each target module in the eliminated target mo...

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Abstract

The invention discloses a distortion calibration method, system and device for a lens module, and a storage medium. The distortion calibration method comprises the steps: selecting a preset number oftarget modules; calculating the distortion deviation of each target module, wherein the distortion deviation is used for representing the deviation between the distortion correction mapping grid of each target module and the average distortion correction mapping grid of all the target modules; removing modules with distortion deviations greater than a preset threshold, returning to the step of calculating the distortion deviation of each target module, and calculating the updated distortion deviation of each target module in the removed target modules; selecting a target module corresponding to the minimum update distortion deviation as a typical module; taking the distortion calibration parameter of the typical module as a distortion correction parameter; wherein the distortion correctionparameters are used for carrying out distortion correction on any lens module. Typical modules are screened out based on small-batch calibration, calibration parameters of the typical modules are applied to other modules, a production line one-by-one calibration task is omitted, and meanwhile the production efficiency and the distortion correction effect are both considered.

Description

technical field [0001] The invention belongs to the field of distortion calibration of lens modules, and in particular relates to a distortion calibration method, system, equipment and storage medium of lens modules. Background technique [0002] In recent years, with the rise of the application of ultra-wide-angle lenses in smartphones, the demand for ultra-wide-angle modules has also increased day by day. Due to external factors such as the production of module factories, the performance of each module may have certain differences. Modules usually use OTP (one-time password) to calibrate these differences. [0003] OTP is a small piece of storage space reserved by sensor (sensor) manufacturers to store some static data. The usage depends on the downstream manufacturers who use the sensor to develop products. For example, the production line of mobile phone camera camera modules will make Calibration or correction of some parameters, such as AWB, LSC, AF, etc., usually wri...

Claims

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Application Information

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IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 霍星蔡进
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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