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。
In television, an unwanted component in the picture signal output from a camera, caused by the scattering of light in the optical system.
假定图象信号的数学期望为零，证明了相关器输出的基本性质。
Suppose the mathematical expectation of image signal is zero, the basic properties of the correlator output are given.
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