Rebar automatically counting on the product line

In order to realize the automation of rebar counting on the production line, this paper analyzes the advantages and the disadvantages of existing solutions. Combining their dominances, this paper presents a new solution. This solution captures the radius of normal rebar according to maximal internal tangent circle algorithm. With the radius, modified gradient Hough circle transform and a series of corresponding operators are used so as to locate rebar. In the end, this paper proposes a set of tracing and counting algorithm which is simple and effective. Hundreds of experiments proved that the failure rate of this solution is extremely low. With elaborate parameters, the failure rate of this system can be reduced to 0.01 percent while producing small diameter rebar in quick pace.