Zooming tracking method and system based on focusing evaluation value feedback regulation

Abstract

The invention discloses a zooming tracking method based on focusing evaluation value feedback regulation. The zooming tracking method comprises the following steps that S101, the automatic focusing is realized before the zooming starting, in addition, the position of a zooming motor with the focusing success and the position of a focusing motor with the focusing success are read, an initial object distance is worked out according to the position of the zooming motor and the position of the focusing motor, the initial object distance is used as the current track object distance, and then, the step S102 is executed; S102, a focusing curve corresponding to the current tracking object distance in a focusing curve group is selected as a tracking curve, and the zooming motor and the focusing motor are driven to carry out object distance tracking according to the tracking curve; S103, the tracked object distance is finely regulated, a zooming amplification process from a wide-angle end to a long-focus end is started, in addition, a focusing evaluation value corresponding to the finely regulated tracking object distance is generated, the current tracking object distance is modified according to the focusing evaluation value, the modified tracking object distance is used as the new current tracking object distance, and then, the operation returns to the step S102. The invention also discloses a zooming tracking system based on focusing evaluation value feedback regulation.

Description

technical field [0001] The present invention relates to the technical field of video image acquisition control, in particular to a zoom tracking method and system based on feedback adjustment of focus evaluation value. Background technique [0002] As security monitoring, TV recording and other technical fields have higher and higher requirements for the quality of video acquisition, correspondingly higher requirements are also required for the flexibility of image acquisition by imaging equipment. Therefore, in addition to the rigid requirements for related video parameters such as resolution and color, technologies such as flexible camera zoom and auto focus have become more and more popular applications, especially in the fields of security monitoring and TV photography. [0003] With the maturity of electric zoom and automatic focus technology, how to keep the image clear during the zoom process has become a key technology, which is directly related to the quality of vid...

AI Technical Summary

Problems solved by technology

[0006] 1. In the field of security, the speed ball, pan-tilt, all-in-one camera and other variable-magnification cameras in the process of optical zooming and zooming in to obtain and identify the target object do not zoom in and track, and they are blurred during the zooming process. If Focus after the zoom is completed, the target may have changed, which may easily cause monitoring loopholes

[0007] 2. When the variable-magnification camera is in the process of automatic inspection, the camera may be in frequent zoom and rotation at this time. Without zoom tracking, the video will be in a blurry state most of the time, losing the meaning of inspection

[0008] 3. During the recording of TV and movies, the far and near switching of the scene is normal, so the camera is often in the process of zooming. Without zoom tracking, the process will be blurred, and a good visual experience cannot be obtained.

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