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Zoom lens focusing curve calibration system and method thereof

A zoom lens and calibration system technology, applied in the camera field, can solve the problems of low calibration accuracy, not the clearest image, and a large number of manual participation, etc., to achieve high-precision results

Pending Publication Date: 2021-10-08
深圳亿嘉和科技研发有限公司
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Problems solved by technology

At present, zoom camera manufacturers use manual calibration of several points, and use high-order equations to fit the focus curve to calibrate the lens, but the calibration accuracy of this method is not high, and it also requires a lot of manual participation. Move the focus group according to the focus curve calibrated by the traditional method , the resulting image is not the sharpest

Method used

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  • Zoom lens focusing curve calibration system and method thereof
  • Zoom lens focusing curve calibration system and method thereof
  • Zoom lens focusing curve calibration system and method thereof

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Embodiment Construction

[0035] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0036] figure 1 It is the structural diagram of the zoom lens focusing curve calibration system of the present invention, as figure 1 As shown, the zoom lens focus curve calibration system of the present invention includes a guide rail 1, a calibration plate 2, a motor 3, a camera 4, and a host computer 5, wherein the calibration plate 2 is slidably mounted on the guide rail 1, and one end of the guide rail 1 is provided with a drive The motor 3 that the calibration plate 2 slides on the guide rail 1 is provided with an encoder for collecting the rotation angle of the motor; the camera 4 is set at the position where the calibration plate 2 can be seen in its field of view, and it is loaded with a positive calibration The zoom lens of board 2 is provided with a zoom group and a focus group whose movements are controlled by stepping motors respe...

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Abstract

The invention discloses a zoom lens focusing curve calibration system and method thereof. The system comprises: a calibration piece; a camera which directly faces the calibration piece, is internally provided with a zooming group and a focusing group, and is used for collecting calibration piece images at different focusing distances under different zooming multiples; and an upper computer which is used for acquiring the calibration part image acquired by the camera and calculating the corresponding image definition to obtain the focusing distance when the image definition is maximum under the corresponding focal multiple so as to obtain a focusing curve table. According to the method, the position of the zoom lens focusing group under each distance and magnification is calibrated step by step, so that the purpose of generating the high-precision focusing curve table is achieved, the precision higher than that of fitting and estimation by adopting a high-order equation is achieved, and high automation is achieved.

Description

technical field [0001] The invention relates to the technical field of cameras, in particular to a zoom lens focusing curve calibration system and method thereof. Background technique [0002] Camera electric zoom lens is a lens with built-in motor and variable focal length. When the lens is sold, the manufacturer will provide the focus curve table calculated by the lens optical theory to guide the focus. However, due to the limitation of the production process, the lens will be different from the theory after production There is a certain deviation in the focus curve table on the camera. If the focus group is moved to the corresponding position according to the theoretical focus curve table, the focus will not be clear. The focusing curves provided by the manufacturer are usually calculated at intervals of 0.5 meters or 1 meter. In scenarios requiring fast focusing such as power inspections, each lens must be calibrated again to obtain centimeter-level focusing curves with...

Claims

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Application Information

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IPC IPC(8): G06T7/80H04N5/232
CPCG06T7/80H04N23/673
Inventor 程敏岑兴设
Owner 深圳亿嘉和科技研发有限公司
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