Camera distance measuring method and system

Abstract

The invention discloses a camera distance measuring method and system. The system comprises an image sensor unit, a lens unit, a lens driving device unit, an automatic focusing unit and a gyroscope unit. The method mainly comprises the following steps: 1, calibrating a codon value-object distance table, namely, calibrating the codon value (input parameter of the lens driving device unit)-object distance table under three groups of different postures (horizontal posture, overlook posture and elevation posture) as requirement; 2, automatically focusing a target object to obtain the codon value of the current lens driving device unit; 3, acquiring the overlook angle and the elevation angle measured by the gyroscope unit; and 4, calculating the actual distance to the target object based on thecodon value, the overlook angle and the elevation angle of the lens driving device unit. The method and the system can be compatible to various smart devices, such as a smart phone, a laptop and thelike; in addition, the gyroscope unit is introduced, so that the problem that different measuring postures lead to different measuring values can be solved, as a result, the result accuracy is improved.

Description

technical field [0001] The invention relates to the field of electronic information systems, in particular to a camera distance measuring method and system. Background technique [0002] Judging the distance between the current position and the target object is a requirement that is often encountered in daily life. Common handheld ranging devices are generally equipped with a signal transmitting device and a receiving device, which measure the interval between the signal transmitting time and the reflected signal receiving time. Estimate the distance between it and the target object. The common signals are ultrasonic, infrared, laser, etc. At present, this kind of handheld device is generally used in professional fields, and its cost is high, so it is difficult to promote it in daily life. [0003] With the popularization of smart devices such as smartphones and tablet computers, it is more and more convenient for people to obtain information, and the functions of smart devi...

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Problems solved by technology

[0005] In order to solve the problems of inaccurate estimation of optical parameters in the current monocular camera distance measurement, and the measurement results are greatly affected by the measurement attitude, the present invention proposes a camera distance measurement method and system, which is different from other monocular camera distance measurement methods. The system does not need to accurately know the specific parameters of the camera lens. It only needs to obtain three sets of codeword values ​​(input parameters of the lens driver unit) under different attitudes (horizontal, overlooking and looking up) by means of calibration. When the focus is successful, the actual distance to the target object can be calculated by combining the lens driver codeword value and the pitch angle measured by the gyroscope; at the same time, this method introduces the gyroscope unit, and solves the problem by introducing the calculation of the pitch angle. Different attitudes during measurement lead to different measurement values, making the results more accurate

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