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.