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Full-Text Articles in Engineering
New Solution For Frequency And Pixel Domain Coding Using Convex Sets, Pete Santago, Sarah A. Rajala
New Solution For Frequency And Pixel Domain Coding Using Convex Sets, Pete Santago, Sarah A. Rajala
Sarah A. Rajala
This paper describes a new algorithm for combining spatial and frequency domain information about an image in order to improve coding. The algorithm utilizes successive projections onto two non-intersecting sets in order to determine the optimal frequency domain coefficients to transmit given some known spatial information. This technique is best suited to fixed block size transform coders and builds on the techniques used in previous work.
Detection Of Maneuvering Target Tracks, Mary L. Padgett, Sarah A. Rajala, Wesley E. Snyder, W. Howard Ruedger
Detection Of Maneuvering Target Tracks, Mary L. Padgett, Sarah A. Rajala, Wesley E. Snyder, W. Howard Ruedger
Sarah A. Rajala
This paper presents a new technique for the detection of moving target tracks, where those tracks are linear paths or segments of circles[1,2]. The images used as input represent a time-varying sequence of noisy satellite images of terrain and a moving target(s). Preprocessing of the image sequence involves use of third order differencing to remove stationary points and produce a sequence of intermediate images containing only the target track(s) and noise from various sources[3]. The new procedure described in this paper begins by selection of a window from the preprocessed image sequence. A generalized Hough transform technique is then employed …
Pressure Dissociation Of Solid Nitrogen Under 1 Mbar, A. K. Mcmahan, Richard Alan Lesar
Pressure Dissociation Of Solid Nitrogen Under 1 Mbar, A. K. Mcmahan, Richard Alan Lesar
Richard Alan Lesar
The zero-temperature transition pressure from molecular to monatomic nitrogen is predicted to be less than about 1 Mbar, and should be observable in diamond-anvil cells. This estimate is obtained from total-energy calculations in which compressed molecular nitrogen is found to dissociate into a simple cubic monatomic structure, slight distortions of which are common to other group-V elements. The calculated 35% volume change raises the possibility of a large barrier to dissociation and extensive regions of metastability.