4th International Conference on Signal Processing and Pattern Recognition (SIPR 2018) is a forum for presenting new advances and research results in the fields of Digital Processing and Pattern Recognition. The conference will bring together leading researchers, engineers and scientists in the domain of interest from around the world. Authors are solicited to contribute to the conference by submitting articles that illustrate research results, projects, surveying works and industrial experiences. Topics of interest include, but are not limited to, the following: