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偏振光是通过偏振滤光镜实现的。偏振滤光片只允许在滤光片偏振面上的光线通过，而抑制在 "不正确 "面上摆动的光线。因此，从偏振滤光镜出来的光线总是偏振的。

如果把光看作波，那么波的偏振就意味着电场振幅的方向；它定义了光的振荡状态。虽然在机器视觉中，偏振在大多数情况下是指线性偏振光，但也可以区分线性偏振光、圆偏振光和椭圆偏振光。

在图像采集中，偏振滤光片主要用于避免反射、增强色彩和对比度等。

使用偏振滤光片时，由于光量减少，有时会导致曝光时间延长。

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Polarization of light is achieved by means of a polarizing filter. Polarizing filters only let light that is in the polarization plane of the filter pass through, and suppress light rays that oscillate in the "incorrect" plane. As a result, the light that exits the polarizing filter is always polarized.

If light is regarded as a wave, then the polarization of a wave means the direction of the electric field's amplitude; it defines the light's oscillation state. A distinction can be made between linearly polarized, circularly polarized and elliptically polarized waves, although in machine vision, polarization refers to linearly polarized light in most cases.

In image acquisition, polarizing filters are used to avoid reflections and heighten colors and contrast, among other things.

When using polarizing filters, longer exposure times can sometimes result due to the reduced amount of light.