A high-frequency image can be acquired at low computational cost at high speed.
A polarization optical unit 20 separates incident light into first polarized light and second polarized light to perform optical low-pass filter processing on the first polarized light and combines the first polarized light subjected to the optical low-pass filter processing and the second polarized light not subjected to the optical low-pass filter processing to generate combined light. A polarization image acquisition unit 30 includes a first polarizing pixel that generates pixel information on the first polarization image and a second polarizing pixel that generates pixel information on the second polarization image on the basis of the combined light. An image processing unit 40 performs a difference computation between the first polarization image and the second polarization image acquired by the polarization image acquisition unit 30 to generates the high-frequency image.