The image of PCA fusion has the pixel average value, which is the most proximal one to the ideal value, and the highest spatial correlation. PCA fusion approach can be applied to two or more bands.
PCA变换融合结果图像的灰度均值最接近理想值，空间相关程度最高，PCA变换可以对2个或2个以上多光谱波段进行融合，是一种使用范围较广的融合方法。
参考来源 - 基于像素层的SPOT5全色与多光谱影像融合研究Chaotic sequence has the extreme sensitivity of the initial values and parameters, so that we can get large number of them. Meanwhile, with the length’s increase, chaotic sequences’ autocorrelation and cross-correlation function can be closer to the ideal value statistically.
混沌序列对初始值和参数的极端敏感性,使其数目众多;同时,随着序列长度的增加,混沌序列的自相关和互相关函数的统计值可以接近于理想值;混沌序列具有伪随机特性。
参考来源 - 基于混沌扩频的水声通信技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
And the average rank reaches ideal value.
并且平均水平达到了理想值。
An ideal value would be zero log pages read while seeing a good number of log pages written.
理想情况下，“log pages read”的值应为0，而“log pages written”的值应很大。
The concepts have an ideal value; they have no real value, or at least we do not know whether they have a real value.
的概念有一个理想的价值；他们没有真正的价值，或者至少，我们不知道他们是否有真正的价值。
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