Method and apparatus of measuring depth information for 3D camera
First Claim
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1. An apparatus for measuring depth information, the apparatus comprising:
- a log converting unit configured to receive a light reflected from an object, and to output a log node voltage that is proportional to a log value of an intensity of the reflected light;
a comparison outputting unit connected to an output of the log converting unit, and configured to output a comparison node voltage of a second threshold value when the log node voltage increases by at least a first threshold value after activation of a first control signal,wherein the comparison outputting unit comprises;
a comparator with a first input port and a second input port, the second input port being connected to an input port of the comparison outputting unit;
a buffer connected to the first input port of the comparator; and
a first switch disposed between the buffer and the input port of the comparison outputting unit,wherein the first switch operates based on the first control signal, andwherein the comparator outputs a comparison node voltage substantially equal to the second threshold value when a voltage of a second input port of the comparator is at least the first threshold value greater than a voltage of the first input port; and
at least one discharging unit connected to an output of the comparison outputting unit and configured to discharge, based on a predetermined rule, an output node voltage until a second control signal is activated when the output of the comparison outputting unit is equal to or greater than the second threshold value,wherein the output node voltage is charged, in advance, to a level of a source voltage,wherein the second control signal is activated when the discharging is performed during a predetermined time, andwherein each of the at least one discharging unit discharges the corresponding output node voltage at a different rate.
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Abstract
A depth information measuring method and apparatus for a three-dimensional (3D) camera may output, to an object, an optical pulse of which an intensity is higher than an intensity of an ambient light. The depth information measuring method and apparatus may generate a voltage that is proportional to a log value of an intensity of a light reflected from the object. The depth information measuring method and apparatus may use discharging units, and the discharging units may respectively include dischargers having different discharging speeds or capacitors having different capacities.
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Citations
20 Claims
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1. An apparatus for measuring depth information, the apparatus comprising:
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a log converting unit configured to receive a light reflected from an object, and to output a log node voltage that is proportional to a log value of an intensity of the reflected light; a comparison outputting unit connected to an output of the log converting unit, and configured to output a comparison node voltage of a second threshold value when the log node voltage increases by at least a first threshold value after activation of a first control signal, wherein the comparison outputting unit comprises; a comparator with a first input port and a second input port, the second input port being connected to an input port of the comparison outputting unit; a buffer connected to the first input port of the comparator; and a first switch disposed between the buffer and the input port of the comparison outputting unit, wherein the first switch operates based on the first control signal, and wherein the comparator outputs a comparison node voltage substantially equal to the second threshold value when a voltage of a second input port of the comparator is at least the first threshold value greater than a voltage of the first input port; and at least one discharging unit connected to an output of the comparison outputting unit and configured to discharge, based on a predetermined rule, an output node voltage until a second control signal is activated when the output of the comparison outputting unit is equal to or greater than the second threshold value, wherein the output node voltage is charged, in advance, to a level of a source voltage, wherein the second control signal is activated when the discharging is performed during a predetermined time, and wherein each of the at least one discharging unit discharges the corresponding output node voltage at a different rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of measuring depth information, the method comprising:
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receiving a light reflected from an object; generating a log node voltage that is proportional to a log value of an intensity of the reflected light; generating, as an output of a comparison outputting unit, a comparison node voltage of a second threshold value when the log node voltage increases by at least a first threshold value after activation of a first control signal input to the comparison outputting unit wherein the comparison outputting unit comprises; a comparator with a first input port and a second input port, the second input port being connected to an input port of the comparison outputting unit; a buffer connected to the first input port of the comparator; and a first switch disposed between the buffer and the input port of the comparison outputting unit, wherein the first switch operates based on the first control signal, and wherein the comparator outputs a comparison node voltage substantially equal to the second threshold value when a voltage of a second input port of the comparator is at least the first threshold value greater than a voltage of the first input port; and discharging, by at least one discharging unit and based on a predetermined rule, an output node voltage of each of the at least one discharging unit until a second control signal input to a corresponding discharging unit is activated when the output of the comparison outputting unit is greater than or equal to the second threshold value, wherein the output node voltage is charged, in advance, to a level of a source voltage, and wherein the second control signal is activated when the discharging is performed during a predetermined time, and wherein the discharging comprises discharging, by each of the at least one discharging unit, a corresponding output node voltage at a different rate. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of measuring depth information, the method comprising:
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generating an optical pulse toward an object; receiving a reflected optical signal resulting from the optical pulse being reflected from the object; generating a log node voltage that is proportional to a log value of an intensity of the reflected optical signal; generating, as an output of a comparison outputting unit, a comparison node voltage of a second threshold value when the log node voltage increases by at least a first threshold value after activation of a first control signal input to the comparison outputting unit, wherein the comparison outputting unit comprises; a comparator with a first input port and a second input port, the second input port being connected to an input port of the comparison outputting unit; a buffer connected to the first input port of the comparator; and a first switch disposed between the buffer and the input port of the comparison outputting unit, wherein the first switch operates based on the first control signal, and wherein the comparator outputs a comparison node voltage substantially equal to the second threshold value when a voltage of a second input port of the comparator is at least the first threshold value greater than a voltage of the first input port generating a discharge signal based on the log node voltage; and determining the depth information according to a value measured with respect to the discharge signal a predetermined time after the generation of the optical pulse, wherein the discharge signal varies as a function of time, and wherein the discharge signal is outputted at a different rate for each of at least one discharging unit.
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Specification