A method and a device for determining a field angle of a dome camera

Abstract

The invention relates to the technical field of image processing, and discloses a method and a device for determining a field angle of a dome camera, which are used for realizing automatic determination of the field angle of the dome camera, reducing the labor cost, and being simple in realization process, high in efficiency and suitable for large-area popularization. The method comprises the steps that a first image shot by a dome camera and a second image shot after the dome camera rotates by a preset angle are obtained, and when the dome camera shoots the first image and the second image, the T coordinate or the P coordinate of the dome camera is unchanged; obtaining the value range of the field angle of the dome camera, counting the matching error between the overlapped pixel points ofthe first image and the second image under different field angles in the value range, and obtaining the target field angle of the dome camera according to the field angle corresponding to the matching error with the minimum value.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and device for determining the viewing angle of a dome camera. Background technique [0002] The dome camera can also be called a dome camera, which integrates multiple functions such as an integrated camera, pan / tilt, decoder, and protective cover, and can be applied to the monitoring of open areas. The dome camera is a camera with variable magnification. Each magnification has a field of view, and the size of the field of view and the movement of the movement is not a simple linear relationship. In order to meet the requirements of fine control, it is necessary to complete the field of view calibration at each magnification. [0003] In the prior art, the field of view of the dome camera is mainly calibrated manually, for example, first assuming a field of view, and then looking at the positive and negative characteristics of the 3D positioning error,...

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Problems solved by technology

[0003] In the prior art, the field of view of the dome camera is mainly calibrated manually, for example, first assuming a field of view, and then looking at the positive and negative characteristics of the 3D positioning error, and increasing or decreasing the field of view accordingly, Until the accuracy meets the requirements, it can be seen that in the prior art, the process of determining the field of view angle of the dome camera requires high labor costs, the process is complicated and cumbersome, and is not suitable for large-scale promotion

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