Text information extraction is a growing area of research. Enormous work has been done to efficiently and robustly extract the text regions from scene text images. Various Text extractions models have been defined comprising of various stages. Amongst them text localization is an important stage and thus researchers mainly focus on this stage. This paper provides a review of various techniques of text localization. The paper also includes a comparison of the performance of these techniques on the parameters such as precision rate and recall rate.