An Evaluation of Graffiti Removal with Water-jet Method by Using Image Analysis = Mermer Yüzeylerindeki Duvar Yazılarının (Graffiti) Su Jeti Đle Temizleme Đleminin Görüntü Analizi Đle Değerlendirilmesi

In this study, possible usage of waterjet technique for graffiti removing applications is investigated. As a test stone of the study, Carrara marble was selected and used because it has been widely used for historical and cultural monuments in Italy where graffiti is very common. The stone samples were painted, then divided into different areas and then cleaned with the waterjet machine within different operational conditions which are travel speed of nozzle, water pressure level and inter distances of passing lines. After the removing applications, image processing methods were used in order to evaluate the different cleaned areas. Roughness test was also applied to investigate the surface features of the stones. Finally, it is concluded that waterjet machine can be used for graffiti removal in certain operational conditions.