根据城市规划遥感监测的特点，提出了采用面向对象的变化检测、信息提取和分类方法。
Based on the urban planning remote sensing monitoring characteristics, the object-oriented change detection, information extraction and classification methods are put forward.
文字检测是文字信息提取系统中最重要的环节。
Text detection plays an important role in the system of text information extraction.
本文从系统模型的角度研究了信息隐藏与检测的问题，提出了用参数估计理论来衡量信息提取算法的优劣。
The problem of information hiding and extracting is studied in the perspective of system model in this paper.
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