chapter-5

Harris角点检测，关于角点的应用在图像处理上比较广泛，如图像匹配(FPM特征点匹配)、相机标定等。网上也有很多博客对Harris角点检测原理进行描述，但基本上只是描述了算法流程，而其中相关细节并未作出解释，这里我想对有些地方做出补充说明，正所谓知其然知其所以然，如有不对，还望指正。(Harris corner detection)

Retinex理论的基础理论是物体的颜色是由物体对长波（红色）、中波（绿色）、短波（蓝色）光线的反射能力来决定的，而不是由反射光强度的绝对值来决定的，物体的色彩不受光照非均匀性的影响，具有一致性，即retinex是以色感一致性（颜色恒常性）为基础的。不同于传统的线性、非线性的只能增强图像某一类特征的方法，Retinex可以在动态范围压缩、边缘增强和颜色恒常三个方面打到平衡，因此可以对各种不同类型的图像进行自适应的增强。(The basic theory of Retinex theory is the color of the object by object for the long wavelength (red), medium (green), short wave (blue) light reflection ability to decide, rather than by the intensity of reflected light of the absolute value to decide, the color of the object under illumination nonuniformity effects, consistent with the Retinex, that is based on color constancy (color constancy based). Different from the traditional linear, nonlinear image enhancement method of only one kind of features, Retinex can be in dynamic range compression, edge enhancement and three aspects of color constancy hit the balance, thus enhancing adaptive to a variety of different types of images can be.)

基于分片重排列技术的维数约简方法，用于特征提取。(Patch Alignment for Dimensionality Reduction，IEEETrans.，2009.)

能计算图像的灰度直方图，及其对应的灰度均值(calculate means ，variance，bins)

HuGO隐写算法，目前最流行的隐写算法之一(HUGO，Highly Undetectable Steganography Algorithm)

说明：  图像融合，实现两幅图像合成一张宽视野的广角图(Image fusion, the two images are combined into a wide field of view)

本算法一种基于量子遗传算法的图像增强方法，包含多个m子文件。使用量子旋转门(The algorithm based on quantum genetic algorithm of image enhancement methods, contains more than one m subfolders. The use of quantum revolving door)

说明：  用于基本的envi熟悉认知，步骤清晰，亲历亲为，切实可用(It is used for basic envi, familiar with cognition, clear steps, personal experience and practical use)

水下图像的matlab程序，FCM水下图像聚类及图像增强matlab代码，非常有用(Underwater image matlab procedures, FCM underwater image clustering and image enhancement matlab code, very useful)

解决一些图像处理的小问题，具体的划分和问题，文件里有提到(Solve some small problems in image processing)