For the Flexibility, the FPGA could achieve address decoding and the calculation of signal amplitude and then control the signal attenuation base on the amplitude.

Firstly,it was assumed that the interceptors knew enough information such as the mode of en/decoding,the constructing mode of address code,the transmission rate of the system,the value and quantity of wavebands,etc.

It uses permuted watermark to generate address codes, then finds the corresponding position in DCT domain blocks of host image and changes the coefficient value of the neighboring pixels according to a chaotic pseudo-random sequence.

Methods Dynamic address code design and automatic compositor algorithms were integrated into the software design,while the running out was eliminated by adopting watch dog chip.

Phase lock oscillator, address coding and intermission mode are taken to stabilize the system and to promise the target s working period longer than 10 day.

This paper introduces the main principle,system structure and software design of vidio tape image storing and archiving system which was controlled by microcomputer It also expounds the operational process of single frame image archiving by address cod