图像的频域变换，包括对数变换，使用填充和不使用填充的滤波，空间域滤波和频域滤波的比较，增强水平，垂直边缘等变换。 -Frequency domain transform images, including logarithmic transformation, using the fill and without using a filler filter, compare the spatial domain and frequency domain filtering filtering, enhanced horizontal and vertical edges transform.