Three aspects are mainly discussed in this paper . first part , the fundamental theory of digital image processing . this part introduces the fundamental theory of image processing that related to the subject , including image digitalization ( quantization and sampling ) ; image enhancement and smoothness , introduce histogram enhancement , grayscale transformations , filtration and sharpening ; image segmentation and edge detection ; image geometric transformations ; image properties and understanding 本论文主要阐述了以下三个方面的内容:第一数字图像处理的基本理论部分,该部分主要介绍了与本课题有关的几种图像处理理论知识:图像数字化,包括量化和采样;图像增强和平滑,介绍了直方图增强、灰度变换、滤波和锐化;图像分割和边缘检测;图像的几何变换;图像的特征和理解。