这是photoshop中置换滤镜的模拟代码，在photoshop中的置换图是psd文件，但这里是哟使用的是bmp图片。另外，包含了一个简单的图像反相功能，该功能是使用了指针，直接对图像数据的内存操作。-which is the replacement filter simulation code, photoshop in the replacement plan is psd file, but here is the use of yo bmp picture. Also, include

* Frequency domain filtering -1. Discrete Fourier Transform Write a C++ function for each of following: (a) Multiply the input image by (-1)x+y to center the transform for filtering. (b) Compute the two-dimensional discrete F

调用opencv的cvFindHomography函数求得H矩阵，再利用利用cvInvert求得H的逆矩阵，最后，选取图像上的像素点，利用cvMatMul(Ma, Mb, Mc)求出其结果矩阵。-The cvFindHomography call opencv function matrix H is obtained, and then use use cvInvert determined inverse matrix H, and finally, the pixels on the i