Figure 9
From: Traceable Quantum Steganography Scheme Based on Pixel Value Differencing
An illustration of the data embedding. The gray values of a sample two-pixel block are assumed to be (40, 27). The difference value is 13, which is in the range of 8 through 15. Therefore, the difference value is in the range of R1, which means that three qubits are embedded in cover image, that is, the value of \(|{S}_{YX}^{1}{S}_{YX}^{01}\rangle \) and operator information qubit is \(|01\rangle \) and \(|0\rangle \), respectively. It is added to the lower bound value 8 of R2, resulting in a new difference value 10. Next, the new pixel values (38, 28) are obtained by the operational criterion in Eq. (7).
