IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0796358
(2013-03-12)
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등록번호 |
US-8896750
(2014-11-25)
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우선권정보 |
JP-2012-078677 (2012-03-30) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Greenblum & Bernstein, P.L.C.
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인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
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A photographing device includes a photographing optical system having an image sensor, a polarizing filter which rotates about an optical axis of the photographing optical system and is positioned in an optical path thereof, a rotation driver which preliminarily rotates the polarizing filter at a pr
A photographing device includes a photographing optical system having an image sensor, a polarizing filter which rotates about an optical axis of the photographing optical system and is positioned in an optical path thereof, a rotation driver which preliminarily rotates the polarizing filter at a predetermined cycle pattern, a detector which detects an object luminance signal of object-emanating light transmitting through the polarizing filter and captured by the image sensor when the polarizing filter preliminarily rotates the polarizing filter at the predetermined cycle pattern, a signal generator which generates a rotation control signal by eliminating any frequency component of a cycle pattern that is different from the predetermined cycle pattern from the object luminance signal, and a controller which controls a rotational angle position of the polarizing filter based on the rotation control signal generated by the signal generator.
대표청구항
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1. A photographing device comprising: a photographing optical system provided with an image sensor;a polarizing filter that rotates about an optical axis of said photographing optical system and is positioned in an optical path of said photographing optical system;a rotation driver that preliminaril
1. A photographing device comprising: a photographing optical system provided with an image sensor;a polarizing filter that rotates about an optical axis of said photographing optical system and is positioned in an optical path of said photographing optical system;a rotation driver that preliminarily rotates said polarizing filter at a predetermined cycle pattern;a detector that detects an object luminance signal of object-emanating light transmitting through said polarizing filter and captured by said image sensor when said rotation driver preliminarily rotates said polarizing filter at said predetermined cycle pattern;a signal generator that generates a rotation control signal by eliminating any frequency component of cycle pattern that is different from said predetermined cycle pattern from said object luminance signal detected by said detector; anda controller that controls a rotational angle position of said polarizing filter based on said rotation control signal generated by said signal generator,wherein said signal generator generates said rotation control signal, from said object luminance signal detected by said detector, in which any frequency component having a cycle or phase that differs from a cycle or phase of a luminance signal corresponding to a polarized state when said polarizing filter is rotated preliminarily at said predetermined cycle pattern has been eliminated. 2. The photographing device according to claim 1, wherein said rotation driver rotates said polarizing filter at an inconstant velocity. 3. The photographing device according to claim 2, wherein said rotation driver rotates said polarizing filter at said inconstant velocity by rotating said polarizing filter by 90 degrees at a first rotational speed, and thereafter rotating said polarizing filter by a further 90 degrees at a second rotational speed that is a double that speed of said first rotational speed. 4. The photographing device according to claim 1, wherein said rotation driver rotates said polarizing filter at a constant velocity. 5. A method of controlling a rotational-angle position of a polarizing filter, wherein the polarizing filter rotates about an optical axis of a photographing optical system, provided with an image sensor, and is positioned in an optical path of the photographing optical system, the method comprising: preliminarily rotating the polarizing filter at a predetermined cycle pattern;detecting an object luminance signal, of object-emanating light which transmits through the polarizing filter and is captured by the image sensor, when the polarizing filter preliminarily rotates at the predetermined cycle pattern;generating a rotation control signal by eliminating any frequency component of a cycle pattern that is different from the predetermined cycle pattern from the detected object luminance signal; andcontrolling a rotational angle position of the polarizing filter based on the generated rotation control signal,wherein the rotation control signal is generated by eliminating, from the detected object luminance signal, any frequency component having a cycle or phase that differs from a cycle or phase of a luminance signal corresponding to a polarized state when the polarizing filter is rotated preliminarily at the predetermined cycle pattern. 6. The method of controlling the rotational-angle position of polarizing filter according to claim 5, wherein the polarizing filter is rotated at an inconstant velocity during the preliminarily rotating of the polarizing filter. 7. The method of controlling the rotational-angle position of polarizing filter according to claim 6, wherein, during the preliminarily rotating of the polarizing filter at the inconstant velocity, the polarizing filter rotates by 90 degrees at a first rotational speed and thereafter rotates by a further 90 degrees at a second rotational speed that is a double speed of the first rotational speed. 8. The method of controlling the rotational-angle position of polarizing filter according to claim 5, wherein the polarizing filter is rotated at a constant velocity during the preliminary rotating of the polarizing filter. 9. A photographing device comprising: a photographing optical system provided with an image sensor;a polarizing filter that rotates about an optical axis of said photographing optical system and is positioned in an optical path of said photographing optical system;a rotation driver that preliminarily rotates said polarizing filter at a predetermined cycle pattern;a detector that detects an object luminance signal of object-emanating light transmitting through said polarizing filter and captured by said image sensor when said rotation driver preliminarily rotates said polarizing filter at said predetermined cycle pattern;a signal generator that generates a rotation control signal by eliminating any frequency component of cycle pattern that is different from said predetermined cycle pattern from said object luminance signal detected by said detector; anda controller that controls a rotational angle position of said polarizing filter based on said rotation control signal generated by said signal generator,wherein said rotation driver rotates said polarizing filter at an inconstant velocity, andwherein said rotation driver rotates said polarizing filter at said inconstant velocity by rotating said polarizing filter by 90 degrees at a first rotational speed, and thereafter rotating said polarizing filter by a further 90 degrees at a second rotational speed that is a double speed of said first rotational speed. 10. A method of controlling a rotational-angle position of a polarizing filter, wherein the polarizing filter rotates about an optical axis of a photographing optical system, provided with an image sensor, and is positioned in an optical path of the photographing optical system, the method comprising: preliminarily rotating the polarizing filter at a predetermined cycle pattern;detecting an object luminance signal, of object-emanating light which transmits through the polarizing filter and is captured by the image sensor, when the polarizing filter preliminarily rotates at the predetermined cycle pattern;generating a rotation control signal by eliminating any frequency component of a cycle pattern that is different from the predetermined cycle pattern from the object luminance signal; andcontrolling a rotational angle position of the polarizing filter based on the generated rotation control signal,wherein the polarizing filter is rotated at an inconstant velocity during the preliminarily rotating of the polarizing filter, andwherein, during the preliminarily rotating of the polarizing filter at the inconstant velocity, the polarizing filter rotates by 90 degrees at a first rotational speed and thereafter rotates by a further 90 degrees at a second rotational speed that is a double speed of the first rotational speed.
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