To replace on-duty staff viewing liquid level value on water level gauge

intelligent remote viewing system based on industrial PC（ IPC） and digital image processing algorithm are researched

and image recognition process of water level gauge is given. Analyze traditional P-M model anisotropic diffusion filtering（ ADF）algorithm

an improved anisotropic diffusion filtering（ IADF） algorithm is presented

combined with given image distortion correction and brighten algorithm

so that intelligent reading of liquid level value of water level gauge is realized. Experimental results show that the algorithm and the realized system have higher intelligentize degree and good real-time and higher recognition rate.