此为openmp的简单运用，主要是运用openmp将串匹配算法并行化-This is simple to use OpenMP, mainly to the use of OpenMP parallel string matching algorithm

输入24位bmp图片，根据误差扩散算法，使其变成黑白图，并尝试使用openMP并行化-input .bmp picture-24bits,according to some method, change to blank-and-white picture,used openMP to parallel