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Automatic focusing method and PTZ (Pan/Tilt/Zoom) camera

An automatic focus and camera technology, applied in the field of optical photography, can solve the problems of slow focusing speed and inability to achieve fast focusing

Active Publication Date: 2018-05-25
HANGZHOU HIKVISION DIGITAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this automatic focusing method has a slow focusing speed and cannot achieve fast focusing

Method used

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  • Automatic focusing method and PTZ (Pan/Tilt/Zoom) camera
  • Automatic focusing method and PTZ (Pan/Tilt/Zoom) camera
  • Automatic focusing method and PTZ (Pan/Tilt/Zoom) camera

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] Those skilled in the art can understand that, in order to monitor a wider range of scenes, a PTZ (Pan / Tilt / Zoom, pan / tilt omnidirectional) camera often needs to be rotated horizontally and vertically. However, when the PTZ camera rotates, it is necessary to re-automatically focus on the object to be photographed to obtain a clear image.

[0055]In the prior art, in order to re-automatically focus on the object to be photographed, it is often necessary t...

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Abstract

The embodiment of the invention provides an automatic focusing method and a PTZ (Pan / Tilt / Zoom) camera. The method is applied to the PTZ camera. The method comprises the steps of calculating target object distance from a lens of the PTZ camera to a monitored target monitoring plane based on a pre-established space object distance model, wherein a space plane equation of a reference monitoring plane is recorded in the space object distance model, and the reference monitoring plane is an equivalent plane of the target monitoring plane; determining position information of a focusing motor of thePTZ camera based on the target object distance, a current multiplying power of the PTZ camera and a preset relationship table, wherein a corresponding relationship among the object distance, the multiplying powers and the positions of the focusing motor is recorded in the preset relationship table when a focus of the lens of the PTZ camera falls on an image sensor of the PTZ camera; and driving the focusing motor to the position corresponding to the position information. Through application of the embodiment of the invention, the PTZ camera can be rapidly and automatically focused.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to an automatic focusing method and a PTZ camera. Background technique [0002] At present, in the process of taking pictures, in order to obtain clear images, PTZ (Pan / Tilt / Zoom, pan-tilt omnidirectional) cameras often need to automatically focus on the object to be photographed, so that the focus of the lens in the PTZ camera falls on the image sensor ( such as CMOS image sensors). Among them, the focal point refers to the converging point where the parallel rays are refracted by the lens. [0003] In the prior art, in order to achieve automatic focus, the PTZ camera needs to adjust the position of the focus motor in the lens multiple times, and use the sharpness evaluation function to evaluate and analyze the sharpness of the objects to be photographed at each position, and obtain the corresponding Sharpness value; then use the blind mountain climbing search algorithm t...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/67G03B3/10G03B13/36G02B7/30H04N23/675H04N23/673H04N23/69H04N23/695
Inventor 龚起马伟民尤灿徐鹏
Owner HANGZHOU HIKVISION DIGITAL TECH
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