So far information hiding algorithm based on DCT domain is the most extensive one in all transformation domain algorithm applications Its most serious disadvantage is the low capacity for information hiding The reason why only small capacity information can be hidden in DCT domain of an image is analyzed

and a high capacity blind information hiding algorithm based on DCT domain is proposed In our algorithm

the uniform spectrum processing is first applied to the original image Then

a global DCT transformation of the image is finished Finally

the information

which is to be hidden

is embedded into the low frequency coefficients in DCT domain Moreover

the information hiding is implemented by using segment quantification method

extracting the hidden information without using the original image Experiment shows that our algorithm has a high capacity of information hiding and good imperceptibility