The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper is concerned with the image encryption scheme based on image complexity, which can satisfy the need of multi-level quality of service. Firstly, each subband of DWT (Discrete Wavelet Transform) coefficient is analyzed. Then, image is cut into blocks. Variances of DWT coefficients are considered as parameters to evaluate complexity of each block. Finally, as to accomplish a controllable visual...
In this paper a multiple frequency domain steganography is proposed; it uses DWT (discrete wavelets transform) with DCT (discrete cosine transform) techniques, which are applied sequentially on the cover image. Embedding the secret message is done in the high frequency coefficients to provide a high imperceptibility; as it is the most important property of any steganography system. For secret message...
Digital video is one of the popular multimedia data exchanged in the internet. Due to their perfectly replicable nature many illegal copies of the original video can be made. Methods are needed to protect copyrights of the owner and prevent illegal copying. A video can also undergo several intentional attacks like frame dropping, averaging, cropping and median filtering and unintentional attacks like...
This paper addresses image compression and fault tolerant encryption of continuous video streams such as digital endoscopy and computer tomography for secure transmission and lower data traffic. Block cipher algorithms may experience multiple pixel defects due to single bit error in an encrypted message. The proposed fault tolerant scheme addresses this error avalanche effect exploiting a three-dimensional...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.