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Optical axis angle calibration, focusing method and system, and dual-camera device
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A dual-camera, calibration method technology, applied in the field of optical focusing, can solve the problems of focusing deviation, affecting the user's shooting effect and experience, and not being able to self-calibrate the optical axis angle parameters, so as to improve efficiency, avoid inaccurate focusing, and improve The effect of user experience
Active Publication Date: 2017-10-17
COOLPAD SOFTWARE TECH (SHENZHEN) CO LTD
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[0003] However, the above process is based on the ideal situation where the two optical axes are parallel. When the optical axis of the shooting equipment is shifted due to manufacturing process deviation or external force collision, determining the object distance value according to the ideal situation will cause serious focus deviation and affect the user's Shooting effect and experience
[0004] After applying the closed-loop motor technology to the dual-lens shooting technology, although it is possible to measure the lens displacement based on the Hall sensor, it cannot self-calibrate the optical axis angle parameters.
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[0124] Such as Figure 8 As shown, when one optical axis of the shooting device is deflected, and the optical axis angle parameter is α, similarly, according to the proportional relationship of similar triangles, there are equations (1) as follows:
[0125]
[0126] Among them, d is the mirror center distance, L is the object distance value, f is the equivalent focal length, x2-x1 is the difference, α is the angle between the optical axis, and Δx is the offset distance of the optical axis. Therefore, the above formula can be used to quickly obtain The object distance value L whose optical axis angle is α, the α value is obtained through the above equations, so as to realize the self-calibration of the optical axis angle, and then calculate the object distance value based on the calibrated α, and combine Table 1 and Table 2 to realize Precise focusing process.
[0127] After simplifying the equation group (1) and eliminating Δx, the calculation formula for obtaining the ang...
Embodiment 2
[0129] Such as Figure 9 As shown, when the two optical axes of the shooting device are deflected, and the angle parameters of the optical axes are α 1 and alpha 2 , the optical axis angle α=α 2 -α 1 , similarly, according to the proportional relationship of similar triangles, there are equations (2) as follows:
[0130]
[0131] Note that the above Δx1, Δx2, Δx, α1, and α2 are all signed, and may be positive or negative.
[0132] in addition,
[0133] Among them, d is the mirror center distance, L is the object distance value, f is the equivalent focal length, x2-x1 is the difference, α is the angle between the optical axes, Δx1 is the offset distance of the first optical axis, and Δx2 is the second optical axis Offset distance, therefore, the object distance value L with an optical axis angle of α can be quickly obtained through the above formula (eliminating the parameters Δx1 and Δx2), and the α value is obtained through the above equations, thereby realizing the...
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Abstract
The present invention provides a method and system for calibrating and focusing the included angle of the optical axis and a dual camera device, wherein the calibrating method includes: focusing on any feature point of the object to be photographed, and obtaining the first object distance value; determining the The first imaging point coordinate value of the feature point on the first camera; determine the second imaging point coordinate value of the feature point on the second camera; according to the first coordinate value imaging point coordinate value, The second coordinate value imaging point coordinate value, the pre-stored parameters of the dual-camera device, the first object distance value and the pre-stored optical axis angle calculation formula determine the optical axis angle of the dual-camera device . Through the technical solution of the present invention, the self-calibration focusing of the dual-camera device is realized.
Description
technical field [0001] The present invention relates to the technical field of optical focusing, in particular to a method and system for calibrating an included angle of an optical axis, a focusing method and system, and a dual-camera device. Background technique [0002] In related technologies, in order to achieve a better focusing effect during the shooting process, dual cameras are developed and applied to various shooting devices. Point imaging to form two imaging points, according to the distance between the two imaging points and the center point of the optical axis point on the imaging plane and the equivalent focal length, determine the object distance value from the object to be photographed to the lens plane, and then determine the focusing process The distance the camera moves. [0003] However, the above process is based on the ideal situation where the two optical axes are parallel. When the optical axis of the shooting equipment is shifted due to manufacturi...
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