Anagylphic stereoscopic image capture device

Patent metadata

Field	Value
Publication number	US-9247233-B2
Application number	US-201213714476-A
Country	US
Kind code	B2
Filing date	Dec 14, 2012
Priority date	Dec 15, 2011
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

The device comprises an aperture stop disc divided into a plurality of mutually exclusive filtering segments comprising a first, a second and a third filtering segment ; the third filtering segment is adapted to pass a third portion of the spectrum which is included in the portion of the spectrum passing the first and second filtering segments. Due to third filtering segment, the aperture assigned to the color component corresponding to the third portion of the spectrum—preferably blue—is larger than the aperture assigned to the color component corresponding to the portion of the spectrum passing the first and second filtering segments.

First claim

The invention claimed is:

1. Anaglyphic stereoscopic image capture device comprising:
an imaging light sensor,
a lens adapted to image on said imaging light sensor a 3D-scene illuminated by rays having wavelengths distributed over a spectrum, said lens having an optical axis and an aperture stop,
an aperture stop disc comprised in a surface of the aperture stop, centered on said optical axis, and divided into a plurality of mutually exclusive filtering segments comprising a first filtering segment, a second filtering segment, and a third filtering segment, wherein the first filtering segment and the second filtering segment are mutually symmetrical with respect to a symmetry axis passing through the center of said aperture stop disc, wherein the first filtering segment is adapted to pass a first portion of the spectrum, wherein the second filtering segment is adapted to pass a second portion of the spectrum which is different from the first portion,
wherein the first portion of the spectrum and the second portion of the spectrum comprise a common portion of the spectrum, wherein the third filtering segment is symmetrical with said symmetry axis and is adapted to pass a third portion of the spectrum included in said common portion of the spectrum, and
wherein the third filtering segment is adapted not to pass part of the first portion of the spectrum which is out of said common portion and not to pass part of the second portion of the spectrum which is out of said common portion.

2. Anaglyphic stereoscopic image capture device according to claim 1 ,
wherein rays emanating from illumination of said scene and imaging said scene through said lens on said imaging light sensor are divided at said aperture stop disc into a first group of rays in the first portion of the spectrum, a second group of rays in the second portion of the spectrum and a third group of rays in the third portion of the spectrum, and
wherein rays of the first, second and third groups converge to form an anaglyphic composite image of said scene on a photosensitive surface of said imaging light sensor.

3. Anaglyphic stereoscopic image capture device according to claim 1 , wherein the third filtering segment fills up the surface of the aperture stop disc except the surface corresponding to the first filtering segment and to the second filtering segment.

4. Anaglyphic stereoscopic image capture device according to claim 1 , wherein:
the first portion of the spectrum is defined such as to give a magenta hue to a polychromatic white light beam passing the first filtering segment,
the second portion of the spectrum is defined such as to give a cyan hue to the polychromatic white light beam passing the second filtering segment, and
the third portion of the spectrum is defined such as to give a blue hue to the polychromatic white light beam passing the third filtering segment.

5. Anaglyphic stereoscopic image capture device according to claim 1 , wherein:
the first filtering segment is defined in order not to transmit significantly wavelengths comprised between 480 nm and 580 nm and in order to transmit significantly wavelengths inferior to 460 nm and wavelengths superior to 600 nm;
the second filtering segment is defined in order not to transmit significantly wavelengths superior to 580 nm and in order to transmit significantly wavelengths inferior to 560 nm; and
the third filtering segment is defined in order not to transmit significantly wavelengths superior to 480 nm and in order to transmit significantly wavelengths inferior to 460 nm.

6. Anaglyphic stereoscopic image capture device according to claim 1 , wherein the aperture stop disc is made of an overlay of two plane color filters, each having a hole or a notch a shape of which corresponds to one of the symmetrical first and second filtering segment, the two color filters being shifted in 180° rotation to position the hole or notch of each filter in symmetry one with the other one with respect to an axis parallel to these filters and passing through a common center of these filters, a material of the first filter being chosen such as to transmit wavelengths as the first filtering segment, and the material of the second filter being chosen such as to transmit wavelengths as the second filtering segment.

7. Anaglyphic stereoscopic image capture device according to claim 1 , wherein the lens comprises an iris which is centered on the optical axis of the lens and positioned immediately adjacent or in a vicinity of the aperture stop disc.

8. Anaglyphic stereoscopic image capture device according to claim 7 , wherein the aperture stop disc is divided into four sectors around its center : a first sector corresponding to the first filtering segment, a second sector corresponding to the second filtering segment which is symmetrical of the first one with respect to said symmetry axis, a third sector corresponding to a first sub-segment of the third filtering segment and a fourth sector corresponding to a second sub-segment of the third filtering segment, the first sub-segment and the second sub-segment being each located on a different side of a line which is perpendicular to said symmetry axis and passes through the center of the disc, and making together the third filtering segment.

9. Anaglyphic stereoscopic image capture device according to claim 8 , wherein, any circle being defined as centered on the center of the aperture stop disc, as covering this aperture stop disc, and being divided in at least four arcs, a first arc covering the first filtering segment, a second arc covering the second filtering segment, a third arc covering the first sub-segment of the third filtering segment, and a fourth arc covering the second sub-segment of the third filtering segment, geometry of the three filtering segments is defined such that a length of each of these arcs increases monotonously in function of a radius of said circle.

10. A method of capturing an anaglyphic stereoscopic image, the method comprising:
imaging, using a lens, a 3D-scene on an imaging light sensor, the 3D-scene being illuminated by rays having wavelengths distributed over a spectrum, said lens having an optical axis and an aperture stop disc, the aperture stop disc comprising a surface centered on said optical axis and divided into a plurality of mutually exclusive filtering segments comprising a first filtering segment, a second filtering segment, and a third filtering segment, the first filtering segment and the second filtering segment being mutually symmetrical with respect to a symmetry axis passing through a center of said aperture stop disc;
passing, using the first filtering segment, a first portion of the spectrum;
passing, using the second filtering segment, a second portion of the spectrum which is different from the first portion, the first portion of the spectrum and the second portion of the spectrum comprising a common portion of the spectrum, the third filtering segment being symmetrical with said symmetry axis;
passing, using the third filtering segment, a third portion of the spectrum included in said common portion of the spectrum; and
preventing, using the third filtering segment, part of the first portion of the spectrum, which is out of said common portion, from passing; and
preventing, using the third filtering segment, part of the second portion of the spectrum, which is out of said common portion, from passing.

11. The method according to claim 10 ,
wherein rays emanating from illumination of said scene and imaging said scene through said lens on said imaging light sensor are divided at said aperture stop disc into a first group of rays in the first portion of the spectrum, a second group o

Assignees

• Thomson Licensing

Inventors

• Sacre Jean-Jacques
• Drazic Valter

Classifications

• H04N13/0203 Primary

  Electricity · mapped topic

• H04N13/0422

  Electricity · mapped topic

• H04N13/0214

  Electricity · mapped topic

• H04N13/214 Primary

  using spectral multiplexing · CPC title

• H04N13/204 Primary

  using stereoscopic image cameras (stereoscopic photography G03B35/00) · CPC title