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An autofocus lens calibration method, electronic device, and storage medium

A calibration method and focal lens technology, applied in TV, electrical components, color TV, etc., can solve the problems of poor real-time performance of clear imaging and high processing cost, and achieve the effect of improving real-time performance

Active Publication Date: 2022-08-02
GUANGZHOU LANGO ELECTRONICS TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the error within the range, it is necessary to use high-precision production instruments and equipment, and the processing cost is high, or to search for the clearest focus position in real time during the camera's autofocus process, but this takes too long and the real-time performance of clear imaging is poor

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  • An autofocus lens calibration method, electronic device, and storage medium
  • An autofocus lens calibration method, electronic device, and storage medium

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Embodiment Construction

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new embodiments. .

[0029] The autofocus lens is driven by a motor (such as a stepping motor) to drive the zoom and focus lens modules to move back and forth to achieve accurate focusing. For example, common autofocus security surveillance camera lenses contain at least two stepping motors to drive the micro-axis, which in turn drives the The front and rear movement of the lens. In order to achieve clear imaging, the lens manufacturer will provide the position coordinate curve of the two stepper motors, and each point (x, y) on the curve corresponds to the position of the two stepper motors that can be clearly imaged. However, due to the above errors, the focusing curve from the lens manufacturer become...

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Abstract

The present invention provides a method for calibrating an autofocus lens, which includes the following steps: setting a stroke range, setting a zoom motor stroke range and a focus motor stroke range; For each coordinate position in the camera, drive the focus motor within the range of the focus motor stroke, search and record the coordinate point with the clearest image, and generate the focus curve corresponding to the preset object distance through all the coordinate points found; Find the focus position corresponding to the current position of the zoom motor on the focus curve corresponding to different preset object distances, and search for the most clearly imaged coordinate point corresponding to the current position of the zoom motor within the range of the found focus position. The present invention relates to an electronic device and a storage medium for implementing an autofocus lens calibration method. By calibrating the focusing curve of the lens, the present invention improves the real-time performance of automatic focusing without increasing the production cost.

Description

technical field [0001] The invention relates to the technical field of security monitoring, and in particular, to an automatic focusing lens calibration method, an electronic device and a storage medium. Background technique [0002] The distance between the plane of the lens mount in the camera and the plane of the exposure window of the image sensor is called the flange back focal length. In security surveillance cameras, there are strict control requirements for the error of this focal length, usually not more than one hundredth of a millimeter, otherwise the automatic The focusing process takes a long time and the real-time performance is poor. In order to meet the above error requirements, there are strict requirements on the production process. [0003] The above errors will inevitably be exceeded during the production of lens modules and cameras. In order to control the error within the range, it is necessary to use high-precision production instruments and equipmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N7/18
CPCH04N7/18H04N23/67H04N23/675
Inventor 陈龙彭观振
Owner GUANGZHOU LANGO ELECTRONICS TECH CO LTD