Visual inspection in ships is an important task to identify its integrity and this task can be done with underwater digital cameras. Linear filtering techniques can be used to identify edges. This paper shows an implementation of a code to process digital image using Sobel filter, adjusted by two parameters and the results show the code highlights points of corrosion or deformation being an important support tool for the inspection of the ship's structure conditions.

Keywords : Image Processing; Filter; Convolution; Sobel Filter; Edge Detection.