Pose measurement method of rotating target in approaching state

The invention discloses a pose measurement method of a rotating target in an approaching state. The method comprises the steps of constructing a three-dimensional feature library of the target according to known model data and a shot target image sequence of the target, denoising and enhancing an input initial frame image, performing target positioning and profile extraction via image erosion anddilation operation, extracting ring features and corner features of the target from the second frame of the input image sequence, achieving matching between two-dimensional image corner features and three-dimensional features of a target model, obtaining more feature point locations via cross-ratio invariance interpolation, calculating a pose parameter of the target via the ring features and the corner features, and performing parameter optimization. The method reduces the area of a region to be processed in the image and improves calculating efficiency via target positioning. The calculatingprecision of the pose parameter is ensured by using the scheme that the ring features, a profile and the corner features are combined for use and more feature points are obtained by the cross-ratio invariance interpolation.