This paper presents a {language-independent) method of locating rectangular text regions in natural scene images. The method consists in two steps that can be applied in succession or independently: the frequency of edge pixels across vertical and horizontal scan lines, and the fundamental frequency in the Fourier domain. The frequency feature of text images is highly intuitive, and thus appealing as much. This is the focus of the research. Also addressed is the detection of rectangles using Rough transform. Since texts that is meaningful to many viewers usually appear in rectangles of colours of high contrast to the background. Hence it is natural to assume the detection rectangles may be helpful for locating desired texts correctly in natural outdoor scene images.