To analyse the color image of driver s face taken by CCD camera under obscure conditions,the image noise jamming is eliminated first by erosion in combination with dilation operation,and the threshold processing is used for the grey level differences in the image to select preliminarily the threshold value of grey level.
该方法可以在昏暗光线下,定位人脸区域,有效去除干扰。
For rapidly rotating stars, the effect of gravity darkening on the equivalent width (EW)of spectral lines is very small, even when the rotation velocity is close to the critical velocity.
对于快速自转的恒星，谱线的等值宽度（ＥＷ）受引力昏暗效应的影响，即使自转速度达到临界也是很小的；而谱线半宽（ＦＷＨＭ）受引力昏暗效应影响相对较大，在（ω≈０。
The twilight of the room prevented her father from seeing the despondent misery of her face.
屋子里的昏暗光线使她父亲无法看到她沮丧、痛苦的面容。
the dusky light inside the cave
山洞内昏暗的光线.
I harmed my eyes by reading in dim light.
我在昏暗的光线下阅读，伤害了眼睛。
Reading in dim light does harm to the eyes.
在昏暗的光线下看书对 眼睛有害.
The grey light of a late summer's evening lowered a damp sky.
深夏夜晚的天空在昏暗的光线里显得很低。
Her face looked sallow and swollen in the dreary light.
在昏暗的光线中看上去她那蜡黄的脸有些浮肿。
Jacob lifted his head and he saw that the light had declined and the evening was upon him.
雅各抬起头来，看见光线渐暗，黄昏来临了。
The old building was a labyrinth of dark corridors.
那古老建筑是一座长廊纵横光线昏暗的迷宫.
The old building was a labyrinth with dark corridors.
那座古老建筑是一座长廊纵横光线昏暗的迷宫。
a dusky winter evening
一个昏暗的冬天的傍晚gloomy指因光线受到阻碍或荫蔽而阴暗的, 如:
There was gloom above and darkness below, with the rays of the sun and the moon completely shut out.
天昏地暗，日月无光。
"The sun and the moon have become dark, and the stars keep back their shining."
日月昏暗，星宿无光。
He felt a thrill the moment he got into the little, shabby, ill-lit theatre.
当他走进那狭小破旧的，光线昏暗的剧场时，顿时感到了一阵激动。
a dull colour, glow, thud
暗淡的颜色、 昏暗的光、 沉闷的响声
A temporary or permanent dimming or cutting off of light.
遮蔽，晦暗暂时或永久的昏暗或无光
The soft, subdued light seen at dusk or dawn or in dimly lit interiors.
半强度的光通常在黄昏、破晓或室内光照弱的时候出现的柔和灰暗的光线
Reading in a poor light may bring on a headache.
在昏暗的灯光下看书会引起头疼。
This is a dimly lit room.
这是一个灯光昏暗的房间。