Rotation angle detection algorithm using Active Contour Boundary based on Sobel edge for rotation invariant system

In this paper, ACB (Active Contour Boundary) algorithm could be corrected rotated image for various real time image recognition system is proposed. We used Sobel edge for important features of simple expression as an inputted image. The angle of rotated image can be implemented the filtering process within a specific range. Additively, our proposed ACB is possible to apply rotation variant system by verifying rotation angle for infinitesimal shift of rotation axis.