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