3*3均值滤波的VHDL语言实现的工程，对红外图像进行有效的去噪处理。这是其中的ALU模块，专门用来测试其延迟状况的模块。-3* 3 mean filter VHDL language works effectively on the infrared image denoising. This is one of the ALU module, designed to test the status of the module delay.