The remarkable development of the medical imagery is due to the large use of telecommunications and information technologies in the medical domain. However, since the telemedicine is a medical act that must answer to ...
详细信息
ISBN:
(纸本)9781538608524
The remarkable development of the medical imagery is due to the large use of telecommunications and information technologies in the medical domain. However, since the telemedicine is a medical act that must answer to stern rules, and follow the easiness that is offered by the informatics sciences to violate the confidentiality and authenticity of medical data. To resolve this problem, a lot of methods combining compression and encryption have been developed in the literature to secure the transmission and the storage of medical images. In this paper, we propose a new approach of partial encryption based on the Discrete Wavelet Transform (DWT) and compatible with the norm JPEG2000 in order to assure an optimal and a secure transmission and storage of medical images. This approach is, on one hand, faster since it permits a very important gain in the encryption-decryption processing time (only 6.25% of the DWT matrix coefficients will be encrypted), and on the other hand more efficient because it permits to get an encrypted medical image.
In the algorithms of content-based image retrieval, color has been used widely as the most important visual character. Three key factors for the image retrieval when using color characters are: color expression, color...
详细信息
ISBN:
(纸本)0819442798
In the algorithms of content-based image retrieval, color has been used widely as the most important visual character. Three key factors for the image retrieval when using color characters are: color expression, color abstraction, and color similarity treasure. In this paper, authors develop a sub-block method based on the color characters to retrieve images. It is found that the image retrieval accuracy of the sub-block histogram method is superior to that of the conventional single global histogram method, but its image retrieval speed is slightly slower than that of the single global histogram method.
This paper presents a new fast license plate location method based on gray-scale image. According to the vertical edge features of the characters on Chinese license plate, it applies the threshold iteration to realize...
详细信息
ISBN:
(纸本)0819442798
This paper presents a new fast license plate location method based on gray-scale image. According to the vertical edge features of the characters on Chinese license plate, it applies the threshold iteration to realize license plate location in complicated background. The algorithm satisfies the requirements of a real-time system and has a good robustness. The precision of segmentation has been closed to 98%.
This paper represents a new spatial domain digital watermarking method, which can trade off between spatial domain and frequency domain approaches. This technique produces a watermarked image that closely retains the ...
详细信息
ISBN:
(纸本)0819442798
This paper represents a new spatial domain digital watermarking method, which can trade off between spatial domain and frequency domain approaches. This technique produces a watermarked image that closely retains the quality of the original host image while concurrently surviving various image processing operations such as lowpass/highpass filtering, lossy JPEG compression, and cropping. This image watermarking algorithm takes full advantage of permutation and 2-D barcode, which is PDF417 coding. The actual watermark embedding in spatial domain is followed using permutated image for improving the resistance to image cropping. Much higher robustness of watermark is obtainable via forward error correction (FEC) technique, which is the main feature of PDF417 codes. Additional features of this technique include the easy determination of the existence of the watermark and that the watermark verification procedure does not need the original host image.
In this letter an approach for double imageencryption practicing Double Random Phase Encoding (DRPE) technique that is based on Walsh lIadamard transform (WIIT) and fractional Fourier transform (FRT) is proposed. The...
详细信息
ISBN:
(纸本)9781538606278
In this letter an approach for double imageencryption practicing Double Random Phase Encoding (DRPE) technique that is based on Walsh lIadamard transform (WIIT) and fractional Fourier transform (FRT) is proposed. The encryption scheme incorporates Radial Hilbert Mask (RHM), Random Phase Mask (RPM) and fractional order as the keys. Using the 4-f system of DRPE twice in both the WHT and FRT domain, each image is encoded independently with the presented scheme. Matlab simulation tests demonstrate the increase in security level of the classical DRPE technique by the designed optical cryptosystem, and it has a superior insusceptibility to noise also. The efficiency and sensitivity of the presented scheme is tested by calculating MSE and PSNR. The histogram shows that the energy is conserved by using Walsh Hadamard transform and shows that the encrypted image is much easy to transfer due to the compression property of WHT.
Currently, research is focused on selective encryption to protect movies against attacks transmitted over a public network This choice is taken to ensure the security of compressed data without adding an important sup...
详细信息
ISBN:
(纸本)9781479948888
Currently, research is focused on selective encryption to protect movies against attacks transmitted over a public network This choice is taken to ensure the security of compressed data without adding an important supplemental computational time for the encryption. So the encryption module is inserted into the video compression chain. In this paper we present an encryption method based chaos inserted in the H.264/AVC chain specially for the motion vectors signs. The results will be deducted according to the values of PSNR (Peak Signal to Noise Ratio), SSIM (Structural SIMilarity) and the encryption rate. Motion vectors signs encryption (MVSE) seems being interesting to lose the visual quality of the video for Inter predicted frames since movies are sensible to the motion sign.
作者：
Li, QQHu, QWWuhan Univ
Sch Remote Sensing & Informat Engn Wuhan 430079 Peoples R China
Bit compression is processed to increase the compression ratio and remove correlation based on 4-neighboring pixels decomposition and integer orthogonal wavelet transformation is done combining the contour feature of ...
详细信息
ISBN:
(纸本)0819442798
Bit compression is processed to increase the compression ratio and remove correlation based on 4-neighboring pixels decomposition and integer orthogonal wavelet transformation is done combining the contour feature of multiple spectrum images. An image restoration based on the theory of modulation transfer function (MTF) is given to improve the image quality, The test of SPOT remote sensing images shows that the compression ratio is over 8,the average Fidelity reached 0.99 and peak value signal-noise ratio (PSNR) is over 42.
The local features are as important as global features for content-based trademark image retrieval. This paper gives a trademark image retrieval method based on the features of sub-images together with global image in...
详细信息
ISBN:
(纸本)0819442798
The local features are as important as global features for content-based trademark image retrieval. This paper gives a trademark image retrieval method based on the features of sub-images together with global image information. We extract the sub-images for each candidate, and take the image for the sub-image of itself, and then use the features of sub-images for retrieval. We have tested our method on an image database containing 3000 binary trademark images and use PVR-component as the evaluation measure, experiments show that using local information together with the global information, the retrieval performance of our method is better than that of retrieval method based only on global features, and the retrieval result can fit the people's visual feelings well.
The atomic functions-based image processing system (AFIPS) is based on discrete atomic transform (DAT). It provides a combination of imageencryption and compression features with a machine learning-oriented data form...
详细信息
ISBN:
(纸本)9783031614149;9783031614156
The atomic functions-based image processing system (AFIPS) is based on discrete atomic transform (DAT). It provides a combination of imageencryption and compression features with a machine learning-oriented data format. Taking into account the current data processing and analysis trends, applying AFIPS is promising. In this paper, a problem of its complexity reduction is considered. The new coding scheme, which ensures a significant decrease in the number of arithmetic operations, is proposed, and its efficiency exploration is given in terms of different indicators. In particular, it is shown that the proposed modification of AFIPS provides a higher compression ratio and, hence, greater memory savings when applying this algorithm with three modes of the DAT procedure: classic, block-splitting, and chroma-subsampling. Also, the suggested improvement reduces the time complexity that is illustrated by processing a satellite image dataset. In addition, the practical aspects of the further applications, including UAV image processing and analysis, are discussed.
compression and encryption are two major aspects of cryptanalysis. compression reduces the large bandwidth requirement while encryption provides security against differential unethical attacks during transmission of i...
详细信息
暂无评论