图像增强实例，包括对比度扩散、直方图均匀化、阈值滤波、均值滤波、中值滤波、低通模板滤波、高通模板滤波、BUTTERWORTH低通滤波、BUTTERWORTH高通滤波、指数高通滤波、KIRSCH锐化、LAPLACE锐化、PREWITT锐化、ROBERTS锐化、SOBEL锐化等。-Examples include image enhancement, contrast diffusion, histogram equalization, threshold filtering, mean filte