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.
Key words
MATLAB /
image processing /
bitmapped /
tide level /
digitizing /
PHOTOSHOP
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 涂望明,魏友国,施少敏. MATLAB在数字图像处理中的应用[J].微计算机信息,2007,23(2/3): 299-301.(TU Wang-ming, WEI You-guo, SHI Shao-min. Application of MATLAB to Digital Image Processing[J]. Microcomputer Information, 2007, 23(2/3): 299-301. (in Chinese))
[2] 秦襄培,郑贤中. MATLAB图像处理宝典[M].北京:电子工业出版社,2011. (QIN Xiang-pei, ZHENG Xian-zhong. MATLAB Image Processing Guide[M]. Beijing: Publishing House of Electronics Industry, 2011. (in Chinese))
[3] 何希平,张琼华. 基于MATLAB的图像处理与分析[J].重庆工商大学学报(自然科学版),2003,(6):22-26. (HE Xi-ping, ZHANG Qiong-hua. Image Processing and Analysis Based on MATLAB[J]. Journal of CTBU(Natural Science), 2003, (6): 22-26. (in Chinese))
[4] GONZALEZ R C. Digital Image Processing Using MATLAB[M]. UK: Pearson Prentice Hall, 2009.
[5] KONG J F, DIMITROV M. Accelerating MATLAB Image Processing Toolbox functions on GPUs[C]∥Proceedings of the 3rd Workshop on General-Purpose Computation on Graphics Processing, Pittsburgh, USA, March 14, 2010: 75-85.
[6] 周广芬,李 鹏,杨久义,利用MATLAB图像处理工具箱进行图形数字化的研究[J].河北科技大学学报,2005, 26(4): 309-312. (ZHOU Guang-fen, LI Peng, YANG Jiu-yi. Study of Using the Image Processing Toolbox of MATLAB to Digitize Graph[J]. Journal of Hebei University of Science and Technology, 2005, 26(4): 309-312. (in Chinese))
[7] DENG Wei, DING Wei-min, ZHANG Hao. Application of MATLAB in Figure Image Processing and Analysis[J]. Journal of Agricultural Mechanization Research, 2006,(6):194-198.
[8] CHAIRA T, RAY A K. Fuzzy Image Processing and Applications with MATLAB[M]. US: CRC Press, 2009.
[9] 彭慧俐.PHOTOSHOP图像处理技巧分析[J].信息与电脑,2010,(6):64-65. (PENG Hui-li. Technical Analysis of Image Processing by PHOTOSHOP[J]. China Computer & Communication, 2010, (6): 64-65. (in Chinese))
PDF(1517 KB)
