Abstract :
One of the main stages in the digital image processing is edge detection
process, with the process object with the boundary between the background can be
determined properly. Edge detection aims to improve the appearance of the
boundary line of an area or object in the image and improve and change the
image. There are many edge detection methods are currently known, in this study
the edge detection method used is the Prewitt, Sobel, Canny and Roberts.
Image analysis is a method of digital image processing. The process is
done in detecting edges starting from the original input image will then be
converted to grayscale images, threshold and method of Sobel, Prewitt, Canny and
Roberts. The parameters of comparison used is visually and from the number of
white pixels contained in the image of the edge detection. The device used in this
paper is MATLAB 7.0
Writing is about comparison of the results with different methods of edge
detection operators using Matlab. By comparison with the results of the four
methods, it can be concluded that the method of Canny gives good results
compared to the Prewitt, Sobel, and Roberts.