1. An image processing apparatus, comprising: an image sensor configured to generate an electrical signal in response to light incident on pixel elements; and a polarizing unit configured to transmit the light to the pixel elements, the polarizing unit comprising a first polarization region configured and arranged to transmit light polarized in a first direction onto a first plurality of the pixel elements including more than four pixel elements of 2×2, a second polarization region configured and arranged to transmit light polarized in a second direction, which is different than the first direction, onto a second plurality of the pixel elements including more than four pixel elements of 2×2, and a transmission region configured and arranged to transmit light polarized in all directions onto a third plurality of the pixel elements.