Multiple Moving Objects Detection Using General Hough Transform
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
For detecting the speed and direction of objects in images, the following procedure is proposed: a) Take three images I0, I1, and I2 of an image sequence captured at times t0, t0+Wt, and t0+2Wt. Assuming uniform (non-accelerated) movements only, Wt should be sufficiently small, e.g., 40 milliseconds, such that for every object the displacement vector between I0 and I1 is approximately equal to the displacement vector between I1 and I2 . Preprocessing: b) Calculate difference images I01 = I0 - I1 and I12 = I1 - I2 . c) Perform threshold operation on I01 and I12 to obtain binary images T01 and T12 of the moving regions. d) Apply a gradient operator (Sobel or similar) to T01 and T12 to represent regions by boundaries G01 and G12 . Main Process: e) Apply a general Hough transform to G01 and G12 .