%0 Journal Article
%A GUO Lei
%A HUANG Feng-hua
%A QIU Jing
%T Method and Application of Tide Level Digitizing By MATLAB Image Processing
%D 2014
%R 10.3969/j.issn.1001-5485.2014.07.016
%J Journal of Yangtze River Scientific Research Institute
%P 86-90
%V 31
%N 7
%X MATLAB image processing together with professional photo software is employed to extract tidal level data by analyzing tidal level images. Firstly, tide level image was pre-processed by PHOTOSHOP such as image rotation, pixel increment, levels operation, key-point plotting and bitmapping. Then the image was read by MATLAB and the location of key-points could be obtained by program. The tide level data number was obtained by the relative location of tide level key-points and horizontal and vertical coordinates key-points. In addition, different approaches were specified for point-curve image and continue curve image. This method  was applied to the acquirement of tidal level data at a tide-gauge station. Application results indicate that the digitized value was very close to the measured value and the mean error was less than 1.0%。This method  could be extended to image data acquirement in similar fields. <br/><br/>
%U http://ckyyb.crsri.cn/EN/10.3969/j.issn.1001-5485.2014.07.016