This paper proposes a novel tamper detection, localization, and recovery scheme for encrypted images with Discrete Wavelet Transformation (DWT) and Compressive Sensing (CS). The original image is first transformed into DWT domain and divided into important part, that is, low-frequency part, and unimportant part, that is, high-frequency part. For low-frequency part contains the main information of image, traditional chaotic encryption is employed. Then, high-frequency part is encrypted with CS to vacate space for watermark. The scheme takes the processed original image content as watermark, from which the characteristic digest values are generated. Comparing with the existing image authentication algorithms, the proposed scheme can realize not only tamper detection and localization but also tamper recovery. Moreover, tamper recovery is based on block division and the recovery accuracy varies with the contents that are possibly tampered. If either the watermark or low-frequency part is tampered, the recovery accuracy is 100%. The experimental results show that the scheme can not only distinguish the type of tamper and find the tampered blocks but also recover the main information of the original image. With great robustness and security, the scheme can adequately meet the need of secure image transmission under unreliable conditions.
In order to overcome the shortcomings of the standard compressive sensing (CS) encryption framework, a novel fusion application scheme of CS and optical transformation technology is proposed. The proposed scheme, making full use of the feature of CS to achieve compression and encryption simultaneously, compresses and encrypts two images into one image, which not only reduces storage space and transmission bandwidth, but also improves the security performance of encryption. In the proposed scheme, the two original images are first sampled with CS, and then double random phase coding is performed to obtain two small-sized images. Meanwhile, the two original images are directly encrypted with double random phase coding to obtain the authentication information. Next, we combine two small-sized images and authentication information into one image, and finally perform double random phase coding again to obtain the final encrypted image. It should be emphasized that the proposed scheme has the function of image authentication. Experiment results validate the effectiveness and advancement of the proposed fusion application scheme.
Existing secure image acquisition works based on compressive sensing, viewing compressive sensing–based imaging system as a symmetric cryptosystem, can only achieve asymptotic spherical security denoting that the ciphertext only leaks information about the energy of plaintext. Thereby, compressive sensing–based secure image acquisition systems usually work in some scenarios of friendly attack, such as brute-force attack for the entire key space and ciphertext-only attack for the complete plaintext. In this article, a novel permutation–confusion strategy using chaos and compressive sensing is put forward to protect the privacy-crucial images from more threatening malicious attacks, including known-plaintext attack and chosen-plaintext attack. Security guarantee is provided by one-time random projection of compressive sensing, sample-level permutation, and bit-level substitution. It is noteworthy that double confidentiality is embedded in compressive sensing–based image acquisition process using the key-related measurement matrix and sparsifying basis and the randomicity is improved. Simulation experiments and security analyses suggest that the proposed framework can achieve a high-level security and the performance of image reconstruction can be distinctly improved.
Abstract. From the embodied jacquard (that is, the design layout) according to analysis from the view of modern environmental ceramic art design, summarizes its main characteristics: its three modes (public, nationality and regionality), similar to the height of the landscape design, and construction of shadow, practical and decoration closely hand in hand, making multiple ways of expressing people unremitting pursuit of material and spiritual double satisfaction.Modern environmental pottery design is a new term since the reform and opening up, but the history of pottery applied in environmental design is quite long, with the economic and social development and progress, the phenomenon that the ceramic technology being applied in environment design and application is showing the ascendant. The research on its inheritance and innovation is more and more extensive and thorough, but from the "garden metallurgy" artisans to sort out the characteristics of modern environmental art design (ie, the main features), the research papers to make an interpretation research and analysis for him, in order to adapt to and promote the rapid development of environmental pottery design and make a summary have not yet, so from this point of view, the research has the reality of the necessity. Overview of Ji Cheng "Garden Metallurgy" and Modern Environmental Ceramics Design"Garden Metallurgy" is a monograph of Chinese ancient garden design, but also the monograph of the first garden art theory in China. It was made by garden builder Ji Cheng, Wujiang County people, Suzhou, Jiangsu Province in the Ming Dynasty, which was written in Ming Chongzhen four years (AD 1631). The book discussed the principles of the construction of the house and the villa, and provided a theoretical framework and a model for the design and construction of the later garden. It reflects the achievements of the ancient Chinese garden and sums up the experience of the garden, an important work of studying ancient garden design .Modern environmental ceramic design, is using ceramic materials in accordance with the law of the aesthetics to carry out practical and decorative design for the indoor, outdoor, landscape and other large and small environmental space for, to create a livable environment of art design categories. Modern environmental ceramics is not only indoor and outdoor, scenes and other environmental practical and decorative design, but also is the practical and comprehensive environmental design of the combination of "workers" and "art" of the building along with the shape of the ceramic material. The Common View of "Garden Metallurgy" Artisans and Modern Environmental Design(1) Emphasis on the overall design and ideas before the construction and implementation "Garden metallurgy" written by Ji Cheng is also said nurturing garden, which contains garden design practice and the garden design theory the two parts. As the practical garden design, it must have a set of design-related elements, follow the relevant rules and laws of design itself. "Garden ...
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