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Practical Algorithms For Image Compression And Surface Estimation, Matthew Y Au
Practical Algorithms For Image Compression And Surface Estimation, Matthew Y Au
UNLV Retrospective Theses & Dissertations
Practical Algorithms for Image Compression and Surface Estimation describes three algorithms for image compression and one algorithm for surface estimation that incorporates kriging and parametric cubic splines. Two of the image compression algorithms are innovative extensions of the Run Length Encoding image compression algorithm and the third is an image compression technique based on kriging. In general the modified Run Length Encoding algorithms yield a better compression ratio by a factor of two while retaining fast decompression of the image. The algorithm based on kriging achieves a compression ratio up to 250:1 and is unique in that the compressed image …
Estimation Of Leakage Between The Shallow And Principal Aquifers In The Las Vegas Valley Water District's Main Well Field, Las Vegas, Nevada, Alan Joseph Bernholtz
Estimation Of Leakage Between The Shallow And Principal Aquifers In The Las Vegas Valley Water District's Main Well Field, Las Vegas, Nevada, Alan Joseph Bernholtz
UNLV Retrospective Theses & Dissertations
Under natural conditions in Las Vegas Valley the shallow aquifer was recharged by upward leakage of ground water from the principal aquifer. Presently recharge to the shallow aquifer is infiltration from over-irrigation which poses a potential threat to the quality of the principal aquifer. To evaluate this contamination potential, water levels from monitoring wells in both aquifers were collected, a three dimensional finite difference ground-water flow model (MODFLOW) was developed to estimate volume and velocity of potential leakage, and water quality samples were collected; Water levels collected in the shallow aquifer show a dependency on potentiometric head in the principal …
A Cubic And Bicubic Method For Curve And Surface Estimation, Niki M Anagnostopoulou
A Cubic And Bicubic Method For Curve And Surface Estimation, Niki M Anagnostopoulou
UNLV Retrospective Theses & Dissertations
A deterministic cubic and bicubic method for curve and surface estimation is presented. The method presented, does not assume that the surface to be estimated, based on a given set of data in the three dimensional space, has a continuous first or second derivatives. The given data does not have to be equidistant. Also, since the method leads to parametric equations for the patches of the surface, the estimating surface does not need to be a function. Parameters {dollar}h\sb{i,j}{dollar} are used for continuity and stress.