背景亮度 meaning in Chinese

background brightness
background luminance

Sensors rotate the display from portrait to landscape as required , turn off the display to conserve power when a user lifts the phone to his ear and adjusts its brightness according to the light
传感器按需轮换屏幕背景，从肖像画到风景图，简单易行；在用户接听电话时关闭背景以节约用电；并且根据周围光线调整背景亮度。
Infrared and visible image sequences of vehicles and airplanes are used for tracking experiments under the situation of that the object is partially blocked by a momentary obstacle , or the illumination and contrast changes , or a big change of the scale and orientation of the object is happened
使用红外和可见光条件下飞机和车辆等图像序列，在存在部分遮挡、目标和背景亮度变化、较大的目标尺度和角度变化等情况下进行了跟踪实验。