for patch-based texture synthesis, this paper investigates the influence of its parameters on synthesis efficiency, where the parameters are the shape and size of patches and the size of the overlap regions between neighbour patches 摘要針對塊紋理合成方法,深入分析了塊的形狀、大小以及相鄰塊間重疊區(qū)域等參數(shù)對合成效率的影響,并基于紋理的特征及其變化的周期和重疊區(qū)域的約束性等給出了衡量這些參數(shù)作用的度量方法。
thus the areas of the overlapping regions are compensated efficiently and the accuracy of measurement is highly improved . the volume of the bubbles can be estimated on the bubbles " area information, and a genetic algorithm ( ga ) based method is used to match and track bubbles in the image sequences, which solve tracking problem under complex conditions efficiently, such as some bubbles may have kinetic occlusion and crossover, some newly generated bubbles may entered into flow field and run away . a smooth kinetic locus is obtained by fitting the discrete centroids with a cubic spline function and at the same time the visual measurement is realized 根據(jù)氣泡在圖像平面中的面積估計(jì)氣泡的體積,并對流場中的所有氣泡采用遺傳算法進(jìn)行最佳的匹配跟蹤,有效地解決了氣泡群在流場中出現(xiàn)如遮擋、交又、新它‘出現(xiàn)、逃逸等復(fù)雜情況下的準(zhǔn)確跟蹤,并采用三次樣條插值方法對離散的質(zhì)心點(diǎn)軌跡進(jìn)行擬合,得到氣泡在流場中平滑的運(yùn)動軌跡,從而實(shí)現(xiàn)了摻氣水流特性的可視化測童。
the method to determine von karman's constant with the integral equations was reviewed . the variation of von karman's constant in the overlap region was also analysed . a new conclusion was driven, that von karman's constant is a function of reynolds number or karman number in the overlap region 介紹了利用積分方程確定圓管湍流中馮?卡門常數(shù)的方法,并詳細(xì)分析了重疊區(qū)域中馮?卡門常數(shù)的變化情況,提出了馮?卡門常數(shù)在重疊區(qū)域中是雷諾數(shù)或卡門數(shù)函數(shù)的新結(jié)論。
the method to determine von karman's constant with the integral equations was reviewed . the variation of von karman's constant in the overlap region was also analysed . a new conclusion was driven, that von karman's constant is a function of reynolds number or karman number in the overlap region 介紹了利用積分方程確定圓管湍流中馮?卡門常數(shù)的方法,并詳細(xì)分析了重疊區(qū)域中馮?卡門常數(shù)的變化情況,提出了馮?卡門常數(shù)在重疊區(qū)域中是雷諾數(shù)或卡門數(shù)函數(shù)的新結(jié)論。