现有的装置靠的是亮度差别，可靠性差。
The excising device is based on the brightness difference, and the reliability is bad.
他发现，他们的大脑会重组成使用不同的音阶、音调和音量——我们的视力也是用同样方式感知亮度和色彩的差别——以建立自身周围环境的图像。
He has found that their brains remodel to use variations in pitch, tone and volume - in the same way sighted people use differences in light and colour - to build up a picture of their surroundings.
在计算机图形学中，显示图象和该图像在其中显示的区域之间亮度或颜色上的差别。
In computer graphics, the difference in brightness or color between a display image and the area in which it is displayed.
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