亮度标度[梯级];
In scene matching, false matching occurs due to brightness, contrast, scale, noise, and rotation difference between real-time target image and standard target image.
景象匹配中,实时目标图与基准目标图之间的亮度、对比度、噪声水平以及旋转等差异是造成误匹配的重要原因。
Since our eyes judge brightness on a logarithmic scale, reducing the Sun's brightness to a third of its normal value will be seen as a slight dimming; certainly not "blotting it out."
由于我们的眼睛是以对数形式衡量光的亮度,因而把阳光亮度减弱到三分之一在肉眼看来只是有一点点暗淡,完全达不到“完全遮蔽”的效果。
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