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.
Recently bag-of-words (BoW) model having been widely used in textual information processing has been extended into many tasks in visual domain such as image classification, scene analysis, image annotation and image retrieval, namely bag-of-visual-words (BoVW) model. Therefore, it is essential to create an effective visual vocabulary. Most of existing approaches create visual vocabularies from image...
Geosynchronous orbit synthetic aperture radar (GEO-SAR) has a good application prospect for its shorter repeat period and a wider swath compared to low Earth orbit SAR. Doppler characteristic of the echo is analyzed. The Doppler history varies frequently in space and approximates a high order signal. A back projection algorithm for high resolution GEO-SAR based on satellite-ground geometry model is...
In this paper, a blind steganalytic scheme is proposed to effectively detect JPEG steganography. Nine statistical models are constructed from the DCT and decompressed spatial domain for a JPEG image. By calculating the histogram characteristic function (HCF) and the center of mass (COM), we measure the energy distribution of each model as one part of our feature set. Moreover, for each model constructed...
A distributed JPEG2000 coding algorithm based on mobile agent is proposed. The network nodes in wireless sensor network (WSN) have limited calculation capability and energy. In order to realize image compression and transmission in WSN, the main contributions of our algorithm are that: (1) a distributed discrete wavelet transform (DWT) in JPEG2000 is utilized. (2) Post-compression rate-distortion...
The goal of blind steganalysis is to detect the presence of hidden data and to eventually extract them from the stego images generated by various data hiding schemes. In this paper, we construct a new blind classifier capable of detecting several steganographies for JPEG images. Thirteen statistics are collected in the DCT domain and spatial domain. By using the characteristic function and the center...
This paper proposes a lossless data hiding scheme with high embedding capacity, which can recover the original image without any distortion after the hidden data have been extracted. In this scheme, difference value of the adjacent pixels is calculated first. After adjusting the difference slightly, we can increase (decrease) it by 1 or maintain it intact to embed information into the cover image...
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.