image,image-processing,dct , Using key positions in steganography using DCT


Using key positions in steganography using DCT

Question:

Tag: image,image-processing,dct

I have a question about steganography. Once the DCT matrix's are computed and the LSB's are replaced can we assume that the location at which the data is entered in the DCT of the cover image is know at the receiver? If not then how is the image reconstructed?


Answer:

Generally speaking, the extraction method assumes the knowledge of the embedding rules so it can reverse them. Deterministic processes are hardcoded, while for stochastic processes you need to provide additional information to replicate their state.

For example:

And so on, with more complex rules.


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