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In order to cope with the shortage of present image encryption algorithm, a novel image encryption algorithm based on chaotic system and fractional Fourier transform is proposed in this paper. The image encryption process includes two steps: first the image is encrypted by employing Fractional Fourier domain double random phase, then the confusion image is encrypted by using confusion matrix which...
In order to improve the security and robustness of image retrieval, a novel image hashing algorithm based on fractional Fourier transform (FRFT) for content-based image retrieval (CBIR) application is proposed in this paper. By employing FRFT and normalized Hamming distance, a robust hashing sequence is obtained by preprocessing, feature extracting and post processing. The security of proposed algorithm...
In this paper, a dual digital watermarking embedding and detecting algorithm for image is presented, which uses the robust watermark and fragile watermark embed in the fractional Fourier transform (FRFT) domain of the image, and the watermark position and the transform order are used as the encryption keys. The experiment results show that the embedded watermark is perceptually invisible and robust...
In order to improve the validity and veracity of image retrieval, an image hashing algorithm based on fractional Fourier transform (FRFT) for content-based image retrieval (CBIR) application is proposed in this paper. By employing FRFT and normalized Hamming distance, a robust hashing sequence is obtained by preprocessing, feature generation and post processing. The orders of FRFT are used as the...
In this paper, a watermarking algorithm for ROI (Regions of Interesting) authentication and tamper detection is proposed. The watermarking is embedded in the DWT (Discrete Wavelet Transform) coefficients of the ROB (Regions of Background). The algorithm uses a hashing to detect whether the ROI of image is tampered, and then uses the watermarking to reconstruct the data of ROI. The experiment results...
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