Apparatus and method for generating depth image
First Claim
1. An apparatus for generating a depth image, the apparatus comprising:
- an optical modulator which optically modulates reflective light which is reflected light from an object to which light modulated using a first pseudorandom (PN) sequence is irradiated, by use of second PN-sequences, each of which has a same PN sequence as the first PN-sequence, but the second PN-sequences having N different time shifts;
an optical sensor which senses the optically modulated reflective light; and
a depth image process unit which samples N intensity images from the optically modulated reflective light sensed by the optical sensor and generates a depth image of the object using the sampled N intensity images,wherein the depth image process unit individually determines respective depth extraction errors of each of a plurality of depths when the plurality of depths are determined according to a plurality of times of flight of light that are predicted using the N sampled intensity images, and selects a depth of the plurality of depths having a smallest error deviation estimate of the errors as a final depth of the depth image,wherein the depth image process unit calculates a time of flight of light that is irradiated from a light source and reaches the optical sensor based on the N sampled intensity images, andwherein when N is a number that is equal to or greater than 3, the depth image process unit determines whether an intensity image IM havin a minimum intensity among the three or more sampled intensity images is a first captured intensity image I1 or a thirdly captured intensity image I3, and calculates a depth according to the determination result.
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Abstract
An apparatus and method for generating a depth image are provided. The apparatus includes an optical modulator, an optical sensor, and a depth image processor. The optical modulator optically modulates light which is reflected from an object to which light modulated using a first pseudorandom (PN) sequence is irradiated. The optical modulator optically modulates the reflected light using second PN-sequences, where each of the second PN-sequences has a same PN sequence as the first PN-sequence, but the second PN-sequences have N different time shifts. The optical sensor senses the optically modulated reflective light. The depth image processor samples N intensity images from the optically modulated reflective light sensed by the optical sensor and generates a depth image of the object using the sampled N intensity images.
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Citations
19 Claims
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1. An apparatus for generating a depth image, the apparatus comprising:
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an optical modulator which optically modulates reflective light which is reflected light from an object to which light modulated using a first pseudorandom (PN) sequence is irradiated, by use of second PN-sequences, each of which has a same PN sequence as the first PN-sequence, but the second PN-sequences having N different time shifts; an optical sensor which senses the optically modulated reflective light; and a depth image process unit which samples N intensity images from the optically modulated reflective light sensed by the optical sensor and generates a depth image of the object using the sampled N intensity images, wherein the depth image process unit individually determines respective depth extraction errors of each of a plurality of depths when the plurality of depths are determined according to a plurality of times of flight of light that are predicted using the N sampled intensity images, and selects a depth of the plurality of depths having a smallest error deviation estimate of the errors as a final depth of the depth image, wherein the depth image process unit calculates a time of flight of light that is irradiated from a light source and reaches the optical sensor based on the N sampled intensity images, and wherein when N is a number that is equal to or greater than 3, the depth image process unit determines whether an intensity image IM havin a minimum intensity among the three or more sampled intensity images is a first captured intensity image I1 or a thirdly captured intensity image I3, and calculates a depth according to the determination result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for generating a depth image, the apparatus comprising:
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an optical modulator which optically modulates reflective light which is reflected light from an object to which light modulated using N first pseudorandom (PN) sequences having, respectively, N different time shifts is irradiated, by use of a second PN-sequence which has a same PN sequence as that of the first PN-sequences but has a time shift different from those of the first PN-sequences; an optical sensor which senses the optically modulated reflective light; and a depth image process unit which samples N intensity images from light signals sensed by the optical sensor and generates a depth image of the object using the sampled N intensity images, wherein the depth image process unit individually determines respective depth extraction errors of each of a plurality of depths when the plurality of depths are determined according to a plurality of times of flight of light that are predicted using the N sampled intensity images, and selects a depth of the plurality of depths having a smallest error deviation estimate of the errors as a final depth of the depth image, wherein the depth image process unit calculates a time of flight of light that is irradiated from a light source and reaches the optical sensor based on the N sampled intensity images, and wherein when N is a number that is equal to or greater than 3, the depth image process unit determines whether an intensity image IM havin a minimum intensity among the three or more sampled intensity images is a first captured intensity image I1 or a thirdly captured intensity image I3, and calculates a depth according to the determination result. - View Dependent Claims (15)
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16. A method of generating a depth image, the method comprising:
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performing optical modulation on reflective light which is reflected light from an object to which light modulated using a first pseudorandom (PN) sequence is irradiated, by use of a second PN-sequence which has a same PN sequence as a first PN-sequence but the second PN-sequence has N different time shifts; sensing the optically modulated reflective light using an optical sensor; sampling N intensity images obtained from the sensed optically modulated reflective light; and generating a depth image of the object using the N sampled intensity images, wherein the generating comprises individually determining respective depth extraction errors of each of a plurality of depths when the plurality of depths are determined according to a plurality of times of flight of light that are predicted using the N sampled intensity images, and selecting a depth of the plurality of depths having a smallest error deviation estimate of the errors as a final depth of the depth image, and wherein the method further comprises; calculating a time of flight of light that is irradiated from a light source and reaches the optical sensor based on the N sampled intensity images, and when N is a number that is equal to or greater than 3, determining whether an intensity inriageavin a minimum intensity among the three or more sampled intensity images is a first captured intensity image I1 or a thirdly captured intensity image I3, and calculating a depth according to the determination result. - View Dependent Claims (17)
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18. A method of generating a depth image, the method comprising:
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irradiating light modulated using a first pseudorandom (PN) sequence toward an object; optically modulating, using a plurality of second PN-sequences, light that is reflected off of the object, the second PN-sequences having a same PN-sequence as the first PN sequence; sensing the optically modulated light using an optical sensor; sampling N intensity images from the sensed optically modulated light; and generating a depth image of the object using the N sampled intensity images, wherein the second PN-sequences have N different time shifts, and wherein the generating comprises individually determining respective depth extraction errors of each of a plurality of depths when the plurality of depths are determined according to a plurality of times of flight of light that are predicted using the N sampled intensity images, and selecting a depth of the plurality of depths having a smallest error deviation estimate of the errors as a final depth of the depth image, and wherein the method further comprises; calculating a time of flight of light that is irradiated from a light source and reaches the optical sensor based on the N sampled intensity images, and wherein when N is a number that is equal to or greater than 3, determining whether an intensity image IM having a minimum intensity among the three or more sampled intensity images is a first captured intensity image I1 or a thirdly captured intensity image I3, and calculating a depth according to the determination result. - View Dependent Claims (19)
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Specification