In detecting the edge of digital im

In detecting the edge of digital imagery, the Robinson operator had the following stages: 1. Read the value of the pixels of RGB image converted into grayscale image 2. Doing convolution between every pixel in the image to the eight mask of Robinson operator that already determined as in Figure 1. 3. In image, not all pixels can do convolution, that rows and columns which is located on the edge of the image have a neighbor is not complete. In this case, create additional rows and columns at edge is filled with a value of 0 so that the process convolution can be implemented. 4. In convolution, there are two possibilities if found, solved in the following manner,namely,: a. If the value result of convolution is negative, the value is made 0. b. If the value result of convolution is bigger than maximum grayscale degree (>255), the value is converted to the maximum grayscale degree. 5. Take the maximum value from eight convolution result. 6. Output image is the result of the convolution value.