Fringe using optical fiber which is from Young′s double hole interference theory and by formation of Mach-Zender interferometer are projected. At the same time, the deformed fringe images is taken by a high speed CMOS camera. By means of computer vision, automated high-speed fringe image processing with the help of open source computer vision (OpenCV) is achieved. Rotating rectangular algorithm is proposed to the automated selection of Fourier filtering window. A variety of phase-unwrapping algorithm is discussed. The overall time complexity of the algorithm for the measurement is O(nlg n) and the measurement time is less than 200 ms. By visual calibration, RMS error is 0.2 mm.