The binarization , dilation and thinning of interference pattern are stressed . computing the excursion of interference pattern based on fourier transform is based on the fact that interference pattern has different phase at different position , the signal extraction of interference pattern and phase unwrapping algorithm are mainly discussed . computing the excursion of the interference pattern based on the interference pattern intensity distribution is to position the fringe according to the intensity distribution characteristic 基于图像处理计算干涉条纹漂移量，目的是抽取干涉条纹的骨架，通过条纹骨架的定位实现对条纹的定位，重点讨论了条纹图像的二值化、膨胀和细化；基于傅里叶变换计算干涉条纹的漂移量，是基于条纹不同位置处的相位不同这一事实，重点讨论了干涉条纹信号的提取和干涉条纹相位去包裹算法；基于条纹亮度分布计算条纹漂移量，是根据条纹自身亮度分布的特点对条纹进行定位。
Under the interference of flat earth effect , the interferogram fringes tend to be over intensive which results in the difficulty of phase unwrapping . so the flat earth effect must be eliminated . and also the phase noises could affect the quality of interferogram so that they should be filtered after the removal of the flat earth effect 初始生成的干涉相位图,由于受到平地效应的影响,干涉条纹过密而增加相位解缠的难度,因此需要去除平地效应, “去平”还需要对相位图进行滤波降噪。
The author digs into various phase unwrapping algorithms and gives a thoroughly compare through analyses and simulation . these algorithms involve branch - cut algorithm , region - growing algorithm , minimum discontinuity approach algorithm , least - squares algorithm , minimum lp - norm algorithm and network - flow algorithm 对二维相位展开问题进行全面和详细的论述，重点分析了分支截断算法、区域增长算法、最小不连续性算法、最小均方算法、最小l ~ p范数算法和网络流算法的原理与实际应用。
Chapter four illustrates the problems of two dimensional phase unwrapping of single and multi - baseline , and again proves the importance of filtering in improving the quality of interferometric phase images and the unwrapping result through comparing the corresponding noisy and filtering phase unwrapping results 第四章研究了单、多基线二维相位解缠问题,通过滤波前后干涉相位图的解缠结果对比和精度分析,再次证明了滤波对于提高干涉相位图质量和改善相位解缠结果的重要性。
