Onboard video image stabilizing method

An airborne video and image stabilization technology, which is used in TV, color TV, image communication, etc., and can solve the problems of poor stabilization accuracy, long processing time, and poor image processing effect.

Inactive Publication Date: 2012-09-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0003] However, the structure of the inertial stabilized platform is complex and the stability accuracy is poor
The amount of data processed directly by electronic image stabilization is huge, and the processing time is long, which is not conducive to real-time requirements, and some electronic image stabilization algorithms (such as gray-scale projection algorithms) are not effective for image processing with large rotation changes
This seriously affects the image stabilization effect and still causes a lot of visual trouble to the observer

Method used

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Embodiment Construction

[0045] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0046] The hardware environment used for implementation is: Lenovo computer, 1GB memory, 256M graphics card, and the running software environment is: Matlab2008a and Windows XP. We have realized the method that the present invention proposes with MATLAB software.

[0047] The present invention is specifically implemented as follows:

[0048] 1. Establishment of the inertial stable platform: design a control system consisting of three loops: current loop (current feedback system), velocity loop (speed feedback system) and position loop (position feedback system).

[0049] where the transfer function of the current loop is The transfer function of the velocity loop is The transfer function of the position loop is exp means to take the exponent. The inertial stabilization system is controlled by a PI controller combining proportional control (P), integral co...

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Abstract

The invention relates to an onboard video image stabilizing method. The method is characterized in that firstly, primary stabilization is performed by means of an inertial platform to eliminate shake interferences with rotation angles larger than five degrees, and secondly, secondary precision stabilization is performed by the aid of electronic image stabilization. Local motion vectors are estimated by the grayscale projection algorithm in the secondary precision stabilization, and compensation is realized by reversely rotating and translating current images on the basis of translation and rotation quantity of affine transformation model estimation frames. Using the onboard video image stabilizing method can effectively eliminate interferences such as rotation and shake of onboard videos, and compared with a traditional single-mode stabilizing method, the onboard video image stabilizing method has the advantages that operation time can be reduced, image stabilizing efficiency is improved, and the requirement on timeliness can be better met.

Description

technical field [0001] The invention relates to an airborne video image stabilization method based on a dual-mode stabilization mechanism of inertial stabilization and electronic image stabilization, which can be applied to various military or civilian airborne image stabilization processing systems. Background technique [0002] In aerial photography, due to interference from factors such as engine and airflow fluctuations, the camera is always in severe vibration and swing, which will cause a lot of rotation shake and other effects in the images captured by the imaging system, the clarity will decrease, and it may even be impossible to watch. Most of the traditional image stabilization methods are single-mode image stabilization, that is, using an inertial stabilization platform or directly performing electronic image stabilization. [0003] However, the structure of the inertial stabilized platform is complex and the stability accuracy is poor. If electronic image stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21H04N5/14
Inventor 郭雷任波赵天云
Owner NORTHWESTERN POLYTECHNICAL UNIV
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