Edge detection of license plate using Sobel operator

Edge detection is one of the important operations in image processing and computer vision. It is the process that is used to locate the boundaries of objects or textures depicted in an image. To know the positions of these boundaries is a critical task in the process of image enhancement, recognition, restoration and compression. The edges of image are considered to be the most important attributes of image that provide valuable information for human image perception. As the data of edge detection is very large, therefore the speed of image processing becomes a difficult problem. The sobel operator is used for edge detection. In the edge function, the Sobel method uses the derivative approximation to find edges of the image. So, it returns edges at those points where the gradient of the considered image is maximum. The horizontal and vertical gradient matrices are used for the Sobel method whose dimensions are 3×3 in the edge detection operations. It has been proven by the results we have obtained, that the edge detection mathematical method by simulation using MATLAB software is very good method for the analyzing the image. After reading the pixels of an image the algorithm is applied in VERILOG. The entire simulation of the above process is done VERILOG using “XILINX-14.1”. And to display input and output image MATLAB is used. This paper focuses on software used to detect edges of image employing mainly the MATLAB program for solving this problem.