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This book offers various schemes related to watermarking techniques for quantum images in spatial and frequency domains. The book includes 7 chapters. Chapter 1 is an introductory part, which describes the research background, the significance of topics, literature review and research methods. Chapter 2 is the basis of knowledge, which provides the techniques of the field of quantum computation, such as quantum bit, quantum gate, and quantum circuit. Chapters 3, 4, 5, 6, 7 are on various quantum watermarking schemes. We present new quantum watermarking algorithms for binary images, grayscale...