Research On Quantum Indexed Image Representations And Information Hiding Methods

At present,a large number of theoretical results have emerged in the field of quantum image processing.Quantum image information hiding is an important branch of quantum image processing and an important application in quantum confidential communication.It can provide more protection for national security,commercial information and personal privacy and has important practical significance.In order to solve the problem of indexed image representation storage and information hiding on quantum computer,two quantum indexed image representation models are proposed according to the existing quantum image representation model,and two quantum indexed image information hiding methods are proposed based on the models.The specific research results of the thesis are as follows.First,two quantum indexed image representation models are proposed.The indexed image contains two parts: a data matrix and a palette matrix.To represent and store the indexed image on quantum computer,these two parts need to be represented and stored separately.The data matrices of the two proposed models are based on the novel enhanced quantum image representation(NEQR),the pixel position information and color values are both represented by a sequence of qubits;the palette matrix of the first model is based on the NEQR model,24 qubits are used to represent the color value of the pixel;the palette matrix of the second representation model is based on the quantum representation of multi wavelength images(QRMW),the three RGB components of the pixel color value are expressed and stored separately.Second,based on the above two quantum indexed image representation models,two quantum indexed image information hiding methods are proposed.The information hiding method based on Ez Stego is to sort the color values in the palette matrix according to the brightness,and embed the secret information according to the sorting result.The original carrier image is required to extract the secret information,which is not a blind extraction method.The information hiding method based on the sum of components(So C)is to match the color values in the palette matrix according to the closest distance and opposite parity rules,and embed the secret information according to the color-pair obtained after the matching is completed.The extraction of secret information does not require the participation of the original carrier image,which is a blind extraction method.Through visual quality,embedding capacity,robustness and safety,the feasibility and effectiveness of the two methods are verified.The proposal of the quantum indexed image representation models provide a theoretical basis for the representation and storage of indexed images on quantum computers,and the information hiding methods based on quantum indexed images broaden the field of quantum information security research.