null space 中文意思是什麼
null space
解釋
零空間-
The minimum size of the character buffer in characters. this value does not include space for a null terminator
這個我看了，還是不懂，既然說最小長度，那就有個比較的過程吧，這個比較的過程我不懂。 -
Or the space character, and characters that might cause problems, such as the null character
）或空格，以及可能造成問題的字元，如空字元。 -
But the standard mc has some shortcomings : firstly, the standard mc picks up isosurfaces by threshold, however, threshold segmentation is invalid for picking up tissues or organs from some medical images ; secondly, the standard mc pocesses cubes one by one, that is to say, all the cubes will be checked, and the algorithm spents 30 % - 70 % of time to check the null units, so we need a reasonable data structure to travel the space data and accelerate the checking or filting of null units ; thirdly, the standard mc has a large scale of triangles, normally, the tissue or organ reconstructed includes hundreds of thousands so much as millions of triangles, this means it hardly to execute real - time rendering or interaction ; lastly, the standard mc can not get the very smoothly surface mesh, and there will be some unexpected accidented cases, especially in the case of big errors in oringinal data
但是標準mc演算法存在較大的問題:標準mc演算法實質上是通過閾值分割來提取等值面，閾值分割對某些醫學圖像的組織或器官的提取難以得到較好的效果;標準mc演算法是逐個移動立方體來進行處理，就是說對所有的立方體都要進行一次檢測，演算法執行中30 % ~ 70 %的時間用在對空單元的檢測上，因此需要有一種合理的數據結構對空間數據進行有效的遍歷，以加速對空單元的檢測和過濾;標準mc演算法產生了大量的三角面片，一般重建的組織或器官包含數十萬甚至上百萬的三角面片，難以實現實時的繪制和交互操作;標準mc演算法得到的表面網格並不光滑，會有一些不期望的凹凸，特別是在原始數據有較大誤差的情況下尤其突出。 -
It redefines the between - class scatter by adding a weight function according to the between - class distance. therefore, it can separate the classes as much as possible. at the same time, it projects the between - class scatter into the null space of the within - class scatter that contains the most discriminant information
新方法重新定義了樣本類間離散度矩陣，在原始定義的基礎上增加一個由類間距離決定的可變權函數，使得在選擇投影方向時，能夠更好地分開各個類的樣本。 -
This value may be null unspecified if swap space is not distinguished from page files
如果交換空間不區分頁面文件，則該值可以為null （未指定） 。 -
Is not null, the common language runtime allocates space in which to return the signature
非空，則公共語言運行庫將分配用於返回簽名的空間。 -
First, we do not know what kind of bifurcation will happen in advance, it is difficult to choose what kind of regular extended system for detecting them. second, if there are higher order singularities, even the multi - dimensional null space, one parameter is not enough for establishing a regular extended system
首先考慮單參數非線性問題，如果參數的個數足夠多，在延拓過程中通過求解各種正則的擴展系統可以求出方程解枝上存在的各種高階奇異點，例如高階折疊點、橫截式分歧點、音叉式分歧點等。
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