Image tracking method for strapdown optical seeker

Abstract

The invention discloses an image tracking method for a strapdown optical seeker. According to the method, influence caused by severe blurring and degradation of imaging in a missile flying process is inhibited by adopting motion-blurred image restoration and a local characteristic based target tracking technology. The method comprises steps as follows: a target characteristic template is extracted firstly, a multi-scale Harris characteristic point and an SIFT descriptor of a local invariant characteristic area of the characteristic point are acquired, and a to-be-tracked characteristic point is selected; secondly, a follow-up frame of image is subjected to motion-blurred image restoration; thirdly, a gate position is predicated through transformation of coordinates on the basis of a missile attitude angle, so that image processing data is reduced, and real-time performance is improved; finally, vector matching of the SIFT descriptor is performed in a gate, and the optimal matching characteristic point is determined, and a target template is updated. According to the method, a target can be tracked stably when the target imaging is severely blurred and degraded due to missile jittering.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image tracking method applied to an optical strapdown seeker. Background technique [0002] The optical strapdown seeker cancels the gimbal and servo system, and rigidly fixes the optical imaging component on the projectile, which can greatly reduce the cost, reduce the mass, volume and launch overload of the projectile, and improve the reliability of the system , is one of the important development directions of precision guidance technology in the future. However, since there is no gimbal to isolate the missile's shaking and attitude movement, the external disturbance, the shaking of the missile body and the attitude movement information are directly coupled to the image formed by the seeker, that is, the target imaging composite of the optical strapdown seeker. Various motion information of the missile carrier in the directions of azimuth, pitch, and roll are capt...

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Problems solved by technology

[0004] However, research has found that the optical strapdown seeker image tracking method in the prior art is based on image grayscale, and does not consider the influence of target imaging blur and degradation caused by projectile shaking, while the optical strapdown seeker has no universal direction. Bracket, the shaking of the projectile during the flight will cause serious blurring and degradation of the target image, which will reduce the target positioning accuracy and template optimization effect based on the gray correlation algorithm, and even lose the target

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