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A method for tracking and positioning a zoom camera during zooming

A tracking and positioning, camera technology, applied in the field of intelligent robots, can solve problems such as incomplete positioning accuracy and positioning frame drift.

Active Publication Date: 2021-06-04
YIJIAHE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this method is that it can only locate a single target object, and in practice, it is found that due to a certain amount of drift in the position of the optical center of the camera, the positioning frame also drifts accordingly, making the positioning not completely accurate

Method used

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  • A method for tracking and positioning a zoom camera during zooming
  • A method for tracking and positioning a zoom camera during zooming
  • A method for tracking and positioning a zoom camera during zooming

Examples

Experimental program
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Effect test

Embodiment 1

[0069] An embodiment of the present invention is a method for tracking and positioning a variable magnification camera during the variable magnification process. Specifically, the positioning frame under the second magnification is obtained through the following steps.

[0070] 1-1), positioning is performed at a certain magnification a (first magnification).

[0071] Positioning algorithms include template matching, neural network models, etc., which are relatively mature algorithms. Assume that when the magnification is a, (ax, ay) represents the obtained center of the positioning frame of the camera.

[0072] 1-2), obtain the field angle at the target magnification b (second magnification), and calculate the focal length corresponding to magnification a and magnification b according to the field angle.

[0073] 1-2-1) Obtain the field of view angle at the target magnification b.

[0074] Calculate the angle of view at several discrete magnifications, and obtain the angle...

Embodiment 2

[0101] In another embodiment of the present invention, its working principle is basically the same as that of Embodiment 1, and the steps of obtaining the center of the positioning frame and the position of the optical center of the camera at the first magnification are basically the same as in Embodiment 1. The main difference is to obtain the first magnification. Steps for positioning the center of the frame at double magnification. Specifically, the positioning frame at the second magnification is obtained by simplifying the imaging model in Embodiment 1.

[0102] In practice, it is found that if the center of the region of interest is adjusted to coincide with the optical center position of the camera at that magnification, then when the magnification is changed to other magnifications during the zooming process of the camera, the center of the region of interest The center and the optical center position of the camera under the new magnification always coincide. Therefor...

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Abstract

The invention discloses a fast algorithm for tracking and locating a variable magnification camera during the variable magnification process, and belongs to the technical field of intelligent robots. The present invention includes: including: positioning at the first magnification, and obtaining the center of the positioning frame at the first magnification; obtaining the field angles at the first magnification and the second magnification, and calculating the first magnification and the second magnification according to the field angles The step of the focal length corresponding to the second magnification; the step of obtaining the optical center position of the camera under the first magnification and the second magnification; the step of calculating the positioning frame of the camera under the second magnification. A fast algorithm for tracking and positioning a variable magnification camera in the present invention enables the camera to quickly and accurately mark the object area of ​​interest during the magnification change process, and when there are multiple objects of interest under the first magnification Multiple object regions of interest under the second magnification of the camera can be annotated at the same time.

Description

technical field [0001] The invention belongs to the technical field of intelligent robots, and in particular relates to a method for tracking and positioning a zoom camera during zooming. Background technique [0002] The zoom cameras used in surveillance equipment on the market today usually have the requirement to locate the target of interest at different magnifications, so that the observation of the target of interest from the whole to the details can be obtained. [0003] There are two methods used by existing cameras. One method is to position the zoom cameras separately at different magnifications, so templates at different magnifications are required. There are two ways to obtain the template, one is to re-acquire at different magnifications, and the workload of collecting templates in this way is relatively large; the other is to zoom in on the template at a certain magnification, but if the zoom ratio is too high, the template will Not very clear. Another probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/80G06K9/32H04N5/232
CPCG06T7/80G06V10/25H04N23/67
Inventor 毛成林王锋项导程敏
Owner YIJIAHE TECH CO LTD
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