有关数字图像处理中彩色图像的介绍，以及一些常见的处理方法-Introduction of digital image processing of color images, as well as some common approach

基于平行投影和透视投影的光线跟踪算法，该算法又有DRR，SSD，MIP三种计算方法。所有代码均为原创。-Based on parallel projection and perspective projection ray tracing algorithm, which have DRR, SSD, MIP three calculation methods. All codes are original.