A zoom tracking method and system based on feedback adjustment of focus evaluation value

Abstract

The invention discloses a zoom tracking method based on the feedback adjustment of the focus evaluation value, which includes the following steps: S101. Automatically focus successfully before starting the zoom and read the zoom motor position and the focus motor position where the focus is successful. According to the zoom motor The position and the position of the focus motor calculate the initial object distance, and use the initial object distance as the current tracking object distance, and then perform step S102; S102, select the focusing curve corresponding to the current tracking object distance in the focusing curve group as the tracking curve, and drive the zoom motor and The focus motor performs object distance tracking according to the tracking curve; S103, fine-tune the object distance for tracking, start the zooming process from the wide-angle end to the telephoto end, and generate a focus evaluation value corresponding to the fine-tuned tracking object distance, according to the focus evaluation value Correct the current tracking object distance, use the corrected tracking object distance as the new current tracking object distance, and then return to step S102. The invention also discloses a variable magnification tracking system based on the feedback adjustment of the focus evaluation value.

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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