Image acquisition method and image acquisition equipment

Abstract

The embodiment of the invention provides an image acquisition method and image acquisition equipment. The image acquisition method is applied to variable-focus image acquisition equipment comprising aplurality of variable-focus lenses, wherein each lens has different zoom ranges, and an overlapped focal length interval exists between two adjacent zoom ranges; the overlapped focal length intervalto which the current focal length belongs is determined by acquiring the current focal length of the image acquisition equipment; by judging whether the current focal length is smaller than a preset switching focal length in the overlapped focal length interval or not, if the overlapping focal length interval is smaller than the preset overlapping focal length interval, it is determined that the short-focus zoom lens is a main lens for zooming according to zoom parameters received by the image acquisition equipment and acquiring images from two lenses corresponding to two zoom ranges with theoverlapping focal length interval, and the long-focus zoom lens is a slave lens for zooming along with the main lens; and an image acquired by the main lens is acquired. By superposing the zoom rangesof the plurality of zoom lenses, the focal length range of the zoom image acquisition equipment is expanded on the premise of not increasing the volume of a single lens.

Description

technical field [0001] The invention relates to the technical field of video monitoring, in particular to an image acquisition method and an image acquisition device. Background technique [0002] With the development of computer, network and image processing technology, video surveillance technology has been widely used. Since video surveillance has diverse image acquisition requirements, such as panoramic image acquisition and key target close-up acquisition, in order to meet the diverse image acquisition requirements, cameras used for video surveillance often require a wide range of focal lengths. [0003] In order to expand the focal length range of the camera, in the corresponding technology, methods such as increasing the lens length of the camera or the number of optical lenses in the lens are usually adopted. However, the above method has the problems of extremely high hardware cost, very large lens volume, and low yield rate of large-volume lenses. Contents of th...

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Problems solved by technology

However, the above method has the problems of extremely high hardware cost, very large lens volume and low yield rate of larger lens production.

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