中文说明：
将图像分为16*16的分块进行计算,稀疏矩阵采用DCT矩阵，观测矩阵采用高斯随机矩阵，重构采用OMP算法,对256*256大小的8bit灰度lena图像进行仿真。
English Description：
The image is divided into 16 * 16 blocks for calculation, DCT matrix is used for sparse matrix, Gaussian random matrix is used for observation matrix, OMP algorithm is used for reconstruction, and 256 * 256 8 bit gray Lena image is simulated.