In the multimedia safety monitoring and detecting system of coal mine

the key technology is to compress the video signals which are from the subsystem of optic-fiber industrial TV. Fractal image coding can not be used in real time coding

because this method will have a delay when the code is picked up. After analyzing the feature of industrial TV image

the image is divided into background district and motive district by means of image enhancement and edge measurement. The background district is a static image

which can be compressed by fractal image coding. After that

a method of block-based image coding and wavelet transform coding to compress the image is presented. It is a good method for fractal coding to compress the motive image. It can be used not only in coal mine industrial TV image but also in any industrial TV image which background image is still and has practical value widely. At the end of the paper

a sample of compression is given.Fractals are a modern invention

they have been recognized as useful to natural scientists only over the last 20 years. Euclidean geometry provides concise accurate descriptions of man-made objects but is inappropriate for natural shapes. Fractals provide an excellent description of many natural shapes. In general

fractals are the result of a construction procedure and algorithm that is often recursive and suited to computers. Fractal coding is a new image coding method after subband coding

model-based coding and wavelet transform. It breaks through traditional coding theory frame. In real time coding and automatic coding it will have wide research prospect.