Imaging device and imaging method

The invention provides an imaging device and an imaging method. The imaging device comprises: a polarized light generator, at least one optical unit, a drive circuit, a non-polarized light battery of lens, and an image acquisition unit. The polarized light generator is used for converting an incident light into a polarized light with a single polarization direction. The at least one optical unit comprises at least one electrically controlled polarized light rotating device and at least one polarized light lens. The at least one electrically controlled polarized light rotating device changes the polarization direction of the polarized light on the basis of drive signals provided by the drive circuit. The non-polarized light battery of lens is arranged at one side, away from the polarized light generator, of the at least one optical unit. The image acquisition unit is used for collecting the polarized light which is modulated by the electrically controlled polarized light rotating device and passes through the non-polarized light battery of lens to generate images. By use of the imaging device and the imaging method, the polarization direction of the incident polarized light can be quickly switched over so that continuous images under different focusing conditions can be quickly obtained.