An Image Tracking Method for Optical Strapdown Seeker

Abstract

The invention discloses an image tracking method of an optical strapdown seeker. The method adopts motion blurred image restoration and target tracking technology based on local features to suppress the influence caused by severe imaging blurring and degradation during missile flight. The steps are as follows: first extract the target feature template, obtain the SIFT descriptors of multi-scale Harris feature points and their local invariant feature regions, and select the feature points to be tracked; secondly, perform motion image blur restoration on subsequent frame images; thirdly, based on elastic The body attitude angle predicts the position of the gate through coordinate transformation to reduce image processing data and improve real-time performance; finally, match the SIFT descriptor vector in the gate to determine the best matching feature point and update the target template. The invention can maintain stable tracking of the target when the shaking of the missile body causes serious blurring and degradation of the target imaging.

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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