Polarization color image capture device
View Patent ↗A polarization color image capture device includes: a polarization color filter plate including a first area configured to transmit light that is polarized in a first direction and that falls within a first wavelength range, a second area configured to transmit light that is polarized in a second direction and that falls within a second wavelength range, and a third area configured to transmit incoming light at least partially; an image sensor in which a plurality of unit blocks, each including first, second and third photosensitive cells and first, second and third polarization filters that are arranged to face the first, second and third photosensitive cells, respectively, are arranged on an imaging area, the polarization transmission axis directions of the first, second and third polarization filters being different from each other; and an optical lens that produces an image on the imaging area of the image sensor.
1. A polarization color image capture device comprising:
a polarization color filter plate including a first area configured to transmit light that is polarized in a first direction and that falls within a first wavelength range, a second area configured to transmit light that is polarized in a second direction and that falls within a second wavelength range, and a third area configured to transmit incoming light at least partially;
an image sensor in which a plurality of unit blocks, each including first, second and third photosensitive cells and first, second and third polarization filters that are arranged to face the first, second and third photosensitive cells, respectively, are arranged on an imaging area, the polarization transmission axis directions of the first, second and third polarization filters being different from each other;
an optical lens that produces an image on the imaging area of the image sensor;
a signal processing section that processes a signal supplied from the image sensor;
a drive mechanism that is able to insert and remove the polarization color filter plate onto/from an optical path; and
a control section that controls the drive mechanism and the image sensor so that a first image capturing session is performed with the polarization color filter plate removed from the optical path and that a second image capturing session is performed with the polarization color filter plate inserted onto the optical path.
2. The polarization color image capture device of claim 1 , wherein the third area is configured to transmit light that is polarized in a third direction and that falls within a third wavelength range.
3. The polarization color image capture device of claim 1 , wherein the signal processing section includes an image processing section that generates a color image based on signals supplied from the first to third photosensitive cells of each said unit block.
4. The polarization color image capture device of claim 1 , wherein the polarization transmission axis directions of the first, second and third areas agree with the polarization transmission axis directions of the first, second and third polarization filters, respectively.
5. The polarization color image capture device of claim 1 , wherein each of the first, second and third areas is formed by stacking a color filter and a polarization filter one upon the other.
6. The polarization color image capture device of claim 1 , wherein the polarization transmission axis directions of the first to third areas are different from each other by 60 degrees.
7. The polarization color image capture device of claim 1 , wherein the first, second and third wavelength ranges correspond to red, green and blue rays' wavelength ranges, respectively.
8. The polarization color image capture device of claim 1 , wherein the signal processing section includes an image processing section which generates polarization information about light that has come from a subject based on signals supplied from the first to third photosensitive cells of each said unit block as a result of the first image capturing session and which also generates a color image based on signals supplied from the first to third photosensitive cells of each said unit block as a result of the second image capturing session and the polarization information.
9. A polarization color filter plate for use in the polarization color image capture device of claim 1 , the filter plate including a first area configured to transmit light that is polarized in a first direction and that falls within a first wavelength range, a second area configured to transmit light that is polarized in a second direction and that falls within a second wavelength range, and a third area configured to transmit incoming light at least partially.
10. An imaging processing device that generates an image based on signals supplied from the polarization color image capture device of claim 1 ,
wherein the imaging processing device generates a color image based on signals supplied from the first to third photosensitive cells of each said unit block of the image sensor.
11. An image processing program stored on a non-transitory computer readable medium that is designed to generate an image based on signals supplied from the polarization color image capture device of claim 1 ,
wherein the image processing program makes a computer perform the step of generating a color image based on signals supplied from the first to third photosensitive cells of each said unit block of the image sensor.