In television, an unwanted component in the picturesignal output from a camera, caused by the scattering of light in the optical system.
电视中来自摄象机的图象信号输出中不希望出现的组成部分，它是由光学系统中光散射引起的。
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Light striking this detector liberates electrons from some of the silicon atoms, producing an electrical signal that is converted by the chip's electronics into a picture.