| CPC H04N 13/254 (2018.05) [H04N 13/243 (2018.05); H04N 13/296 (2018.05); H04N 23/11 (2023.01); H04N 25/50 (2023.01)] | 6 Claims |
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1. A three-dimensional video imaging device comprising:
a light source unit configured to irradiate a subject with infrared light;
a three-chip imaging element unit on which reflected light of the infrared light emitted by the light source unit and reflected by the subject and reflected light of visible light from the subject are incident; and
a processing unit configured to perform control of the light source unit and the three-chip imaging element unit and processing of a signal output from the three-chip imaging element unit,
wherein the three-chip imaging element unit includes
a first prism on which the infrared light and the visible light from the subject are incident,
a reflection dichroic film configured to reflect the visible light and transmit the infrared light out of the infrared light and the visible light that have been incident on the first prism,
a first imaging element configured to receive the visible light reflected by the reflection dichroic film,
a second prism on which the infrared light transmitted by the reflection dichroic film is incident,
a half mirror configured to reflect a part of the infrared light that has been incident on the second prism and transmit a remainder of the infrared light that has been incident on the second prism,
a third prism on which the infrared light transmitted by the half mirror is incident,
one of a second imaging element and a third imaging element configured to receive the infrared light transmitted by the half mirror, and
the other one of the second imaging element and the third imaging element configured to receive the infrared light reflected by the half mirror,
the second imaging element is a short-range time-of-flight (TOF) sensor used to measure a short range, which is a distance range from a short-distance minimum value to a short-distance maximum value,
the third imaging element is a long-range TOF sensor used to measure a long range, which is a distance range that is further than the short range and is a distance range from a long-distance minimum value to a long-distance maximum value,
the second imaging element includes
a first part configured to accumulate an electric charge at a first exposure timing of the second imaging element, which is an exposure timing of the second imaging element, at least most of a light emission period of the light source unit being included in an exposure period of the second imaging element, and
a second part configured to accumulate an electric charge at a second exposure timing of the second imaging element, which is an exposure timing of the second imaging element, the exposure period of the second imaging element starting after the light emission period of the light source unit ends,
a third imaging element includes
a first part configured to accumulate an electric charge at a first exposure timing of the third imaging element, which is an exposure timing of the third imaging element, at least a part of the exposure period of the light source unit being included in an exposure period of the third imaging element, and
a second part configured to accumulate an electric charge at a second exposure timing of the third imaging element, which is an exposure timing of the third imaging element, the exposure period of the third imaging element starting after the light emission period of the light source unit ends,
the processing unit includes
an emission control unit configured to perform light emission control of the light source unit,
a second imaging element control unit configured to control the exposure timing of the second imaging element,
a third imaging element control unit configured to control the exposure timing of the third imaging element,
a first distance data calculation unit configured to calculate first distance data indicating a distance between the three-dimensional video imaging device and the subject on the basis of at least the electric charge accumulated in the first part of the second imaging element and the electric charge accumulated in the second part of the second imaging element,
a second distance data calculation unit configured to calculate second distance data indicating the distance between the three-dimensional video imaging device and the subject on the basis of at least the electric charge accumulated in the first part of the third imaging element and the electric charge accumulated in the second part of the third imaging element,
a measurement range determination unit configured to determine at least which of the short range and the long range the distance between the three-dimensional video imaging device and the subject measured by the three-dimensional video imaging device is included in on the basis of at least a signal indicating the electric charge accumulated in the first part of the second imaging element, a signal indicating the electric charge accumulated in the second part of the second imaging element, a signal indicating the electric charge accumulated in the first part of the third imaging element, a signal indicating the electric charge accumulated in the second part of the third imaging element, and a preset determination rule, and
a distance data output switching unit configured to output the first distance data calculated by the first distance data calculation unit in a case where the measurement range determination unit determines that the distance between the three-dimensional video imaging device and the subject measured by the three-dimensional video imaging device is included in the short range and output the second distance data calculated by the second distance data calculation unit in a case where the measurement range determination unit determines that the distance between the three-dimensional video imaging device and the subject measured by the three-dimensional video imaging device is included in the long range.
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