Abstract: In this paper,according to the requirements of automatic rectification control system for winding molding of heat insulation of solid rocket motor, images of rubber tape edge were captured with industrial camera in real-time, and the images were processed based on image processing algorithm to realize the position detection of rubber tape. Firstly, image preprocessing technology was used for image denoising, the double thresholds of Canny algorithm were determined by the maximum inter-class variance method, and rubber tape edge was extracted. Then the rubber tape edge curve was obtained by cubic polynomial fitting according to the extracted edge pixel point set, and the actual position of the rubber tape edge in the winding molding process was obtained. Finally, the deviation of the rubber tape was obtained by comparing the detected actual position of rubber tape with the reference position of rubber tape according to the current winding angle, according to the rectification control algorithms, deviation was converted into the corresponding control variable to control the actuator for rectification. This position detection method is applied to automatic rectification control system in winding molding of heat insulation of solid rocket motor with excellent effect.

Key words: heat insulation, winding molding, position detection of rubber tape, image processing, Canny algorithm, composites