WO2020032485A1 - 카메라 - Google Patents
카메라 Download PDFInfo
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- WO2020032485A1 WO2020032485A1 PCT/KR2019/009645 KR2019009645W WO2020032485A1 WO 2020032485 A1 WO2020032485 A1 WO 2020032485A1 KR 2019009645 W KR2019009645 W KR 2019009645W WO 2020032485 A1 WO2020032485 A1 WO 2020032485A1
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- control mode
- light
- subject
- input
- module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/271—Image signal generators wherein the generated image signals comprise depth maps or disparity maps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
- G01S17/894—Three-dimensional [3D] imaging with simultaneous measurement of time-of-flight at a two-dimensional [2D] array of receiver pixels, e.g. time-of-flight cameras or flash lidar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4808—Evaluating distance, position or velocity data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
- H04N13/239—Image signal generators using stereoscopic image cameras using two two-dimensional [2D] image sensors having a relative position equal to or related to the interocular distance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
- H04N13/254—Image signal generators using stereoscopic image cameras in combination with electromagnetic radiation sources for illuminating objects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/667—Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes
Definitions
- An embodiment relates to a camera.
- Depth map is required to obtain a 3D image.
- Depth information is information representing a distance in space and represents perspective information of another point with respect to one point of the 2D image.
- One method of obtaining depth information is a method of projecting IR (Infrared) structured light onto an object and extracting depth information by analyzing light reflected from the object. According to the IR structured light method, it is difficult to obtain a desired depth resolution for a moving object.
- IR structured light method it is difficult to obtain a desired depth resolution for a moving object.
- the Time of Flight (TOF) method As a technology to replace the IR structured light method, the Time of Flight (TOF) method has attracted attention.
- the distance to an object is calculated by measuring a flight time, that is, a time when light is reflected by shooting.
- the embodiment relates to a camera, and to provide a camera capable of providing a method of driving a TOF camera optimized for a subject photographing situation.
- the camera is a light emitting module for outputting an output light according to a set control mode, a light receiving module for receiving an input light corresponding to the output light according to the control mode, the presence of the subject based on the input light And detecting at least one of a distance from the subject, resetting the control mode according to a detection result, controlling an output of the light emitting module and an input of the light receiving module according to the reset control mode, and the reset control. And a control module configured to generate a depth map of the subject based on input light input according to a mode.
- the control mode includes a first control mode and a second control mode, wherein the first control mode and the second control mode include an optical exposure time of the light emitting module, a frame rate of the light receiving module, and At least one of the number of pixels to be activated may be set differently.
- the light emitting module When the camera operation signal is input, the light emitting module outputs a first output light according to the preset first control mode, and the light receiving module corresponds to the first output light according to the first control mode. Input light can be received.
- the control module detects the presence of the subject based on the first input light, and when the subject is detected, reset to the second control mode, and the light emitting module outputs a second output according to the second control mode.
- the light may be output and the light receiving module may receive the second input light reflected by the subject.
- the control mode may include third to fifth control modes, and in the third to fifth control modes, at least one of an optical exposure time and a modulation frequency of the light emitting module may be set differently. .
- the modulation frequency is set to a first frequency
- the modulation frequency is set to a second frequency having a value greater than the first frequency
- the fifth control mode may be set to the first frequency and the second frequency.
- the light emitting module outputs a third output light according to the third control mode when the camera operation signal is input, and the light receiving module outputs a third input light corresponding to the third output light according to the third control mode. Can be input.
- the control module detects the presence of the subject based on the third input light. When the subject is detected, the control module calculates a distance from the subject based on the third input light. If not, reconfigure to change to the fifth control mode, and according to the reset fifth control mode, the light emitting module outputs a fifth output light to the subject, and the light receiving module receives the fifth input light reflected by the subject. Can be input.
- the control module resets the third control mode so that the third control mode is maintained when the distance to the subject is greater than or equal to a threshold value, and the light emitting module sends a third output light to the subject according to the reset third control mode. Outputs and receives the third input light reflected by the light receiving module to the subject, and when the distance to the subject is smaller than the threshold value, resets to change to the fourth control mode, and resets the fourth control mode.
- the light emitting module may output the fourth output light to the subject, and the light receiving module may receive the fourth input light reflected by the subject.
- the control module generates a depth map for the subject based on one of the third to fifth input lights reflected by the subject, and based on the third input light or the fifth input light reflected by the subject.
- the depth map having a higher resolution than the depth map based on the fourth input light may be generated through super resolution.
- the control module may calculate the size of the subject based on the generated depth information of the depth map and transmit the calculated size of the subject to the connected application.
- FIG. 1 is a block diagram of a camera according to an embodiment of the present invention.
- FIG. 2 is a flowchart illustrating a first embodiment of a camera control method according to an embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a second embodiment of a camera control method according to an embodiment of the present invention.
- FIG. 4 is a flowchart illustrating a third embodiment of a camera control method according to an embodiment of the present invention.
- FIG. 5 is a view for explaining a control mode according to an embodiment of the present invention.
- FIG. 6 is a diagram for describing a fifth control mode according to an exemplary embodiment of the present invention.
- FIG. 7 is a view for explaining an optimized camera operation according to an embodiment of the present invention.
- the technical idea of the present invention is not limited to some embodiments described, but may be embodied in different forms, and within the technical idea of the present invention, one or more of the components may be selectively selected between the embodiments. Can be combined and substituted.
- first, second, A, B, (a), and (b) may be used.
- a component when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only connected, coupled or connected directly to the other component, It may also include the case of 'connected', 'coupled' or 'connected' due to another component between the other components.
- top (bottom) or the bottom (bottom) is not only when two components are in direct contact with each other, but also one. It also includes a case where the above-described further components are formed or disposed between two components.
- up (up) or down (down) may include the meaning of the down direction as well as the up direction based on one component.
- FIG. 1 is a block diagram of a camera according to an embodiment of the present invention.
- the camera 100 includes a light emitting module 110, a light receiving module 120, and a control module 130.
- the light emitting module 110 outputs output light according to the set control mode.
- the light emitting module 110 may include a light source unit and a light modulator to output output light.
- the light source generates light.
- the light generated by the light source unit may be infrared rays having a wavelength of 770 to 3000 nm, and may be visible light having a wavelength of 380 to 770 nm.
- the light source unit may be implemented through a light emitting diode (LED), and a plurality of light emitting diodes may be arranged in a predetermined pattern.
- the light source unit may include an organic light emitting diode (OLED) or a laser diode (LD).
- OLED organic light emitting diode
- LD laser diode
- the light source unit repeatedly outputs a pulse wave or continuous wave output light by repeatedly turning on / off at predetermined time intervals. All of the plurality of light emitting diodes may repeat blinking at the same time interval.
- all of the plurality of light emitting diodes may repeat blinking at different time intervals during some of the light exposure time.
- the first set of light emitting diodes and the second set of light emitting diodes among the plurality of light emitting diodes may be repeated at different time intervals.
- the light modulator controls the blinking of the light source unit according to the control mode.
- the light modulator may control the blinking of the light source unit to output output light having a modulation frequency according to the control mode through frequency modulation or pulse modulation. Also.
- the light modulator may control the blinking of the light source unit to output the output light during the light exposure time according to the control mode.
- the light receiving module 120 receives input light corresponding to the output light according to the control mode.
- the light receiving module 120 may include a lens unit and an image sensor unit to receive input light.
- the lens unit collects the input light and transmits the light to the image sensor unit.
- the lens unit may include a lens, a lens barrel, a lens holder and an IR filter.
- the lens may be configured in plural, or may be composed of one.
- each lens may be aligned with respect to the central axis to form an optical system.
- the central axis may be the same as the optical axis of the optical system.
- the lens barrel is coupled to the lens holder and may have a space for accommodating the lens therein.
- the lens barrel may be rotationally coupled with one or more lenses, but this is exemplary and may be coupled in other ways, such as by using an adhesive (eg, an adhesive resin such as epoxy).
- the lens holder may be coupled to the lens barrel to support the lens barrel, and may be coupled to a printed circuit board on which the image sensor is mounted.
- the lens holder may include a space in which the IR filter may be attached to the lower part of the lens barrel.
- a spiral pattern is formed on the inner circumferential surface of the lens holder, and similarly, the lens barrel can be rotatably coupled to the lens barrel on which the helical pattern is formed.
- the lens holder may be divided into an upper holder coupled to the lens barrel and a lower holder coupled to a printed circuit board on which an image sensor is mounted.
- the upper holder and the lower holder may be formed in one piece or formed in a structure separated from each other. May be combined. At this time, the diameter of the upper holder may be formed smaller than the diameter of the lower holder.
- the lens holder may be mixed with the housing.
- the image sensor unit absorbs the collected input light to generate an electrical signal.
- the image sensor unit may absorb the input light in synchronization with the blinking period of the light source unit.
- the image sensor unit may absorb the input light in the in phase and the out phase with the output light, respectively. That is, the image sensor unit may repeatedly perform the step of absorbing the input light at the time when the light source is turned on and the step of absorbing the input light at the time when the light source is turned off.
- the image sensor unit may generate an electrical signal corresponding to each reference signal using a plurality of reference signals having different phase differences.
- the frequency of the reference signal may be set equal to the frequency of the output light. Therefore, when output light is output at a plurality of frequencies, the image sensor unit generates an electrical signal using a plurality of reference signals corresponding to each frequency.
- the electrical signal may include information about the amount of charge or voltage corresponding to each reference signal.
- each reference signal C 1 to C 4 may have the same frequency as the output light, but may have a phase difference of 90 degrees.
- One of the four reference signals C 1 may have the same phase as the output light.
- the input light is delayed in phase by a distance from which the output light is reflected and then returned to the object.
- the image sensor unit may mix the input light and each reference signal to generate an electrical signal for each reference signal.
- the image sensor unit absorbs the input light according to the plurality of frequencies. For example, it is assumed that output light is generated at frequencies f 1 and f 2 , and the plurality of reference signals have a phase difference of 90 degrees. Then, the input light, so too have the frequencies f 1 and f 2, the frequency can be generated with four electrical signals from the four reference signals corresponding to the input light is f 1. Four electrical signals may be generated through input light having a frequency f 2 and four reference signals corresponding thereto. Thus, a total of eight electrical signals can be generated.
- the image sensor unit may be implemented as an image sensor in which a plurality of photodiodes are arranged in a grid.
- the image sensor may be a complementary metal oxide semiconductor (CMOS) image sensor, or may be a charge coupled device (CCD) image sensor.
- CMOS complementary metal oxide semiconductor
- CCD charge coupled device
- the light emitting module 110 and the light receiving module 120 may be implemented in plural in the camera.
- the first light emitting module 110 and the corresponding first light receiving module 120 may be disposed on the front of the smartphone
- the second light emitting module 110 and the second light receiving module 120 corresponding to the second light emitting module 110 may be disposed at the rear of the smartphone.
- control module 130 detects at least one of the presence of the subject and the distance to the subject based on the input light.
- the control module 130 may detect at least one of the presence of the subject and the distance to the subject through the depth map generated through the input light.
- the control module 130 may generate a depth map through an electrical signal corresponding to the input light.
- the distance to the subject may be detected using Equation 1 below.
- f means the frequency of the output light
- c means the speed of light
- ⁇ means the phase difference between the output light and the corresponding input light.
- phase difference between the output light and the corresponding input light may be calculated through Equation 2 below.
- Q 1 to Q 4 are charge charge amounts of each of the four electrical signals.
- Q 1 is the amount of charge of the electric signal corresponding to the reference signal of the same phase as the incident light signal.
- Q 2 is the amount of charge in the electrical signal corresponding to the reference signal 180 degrees slower than the incident light signal.
- Q 3 is the amount of charge of the electrical signal corresponding to the reference signal 90 degrees slower than the incident light signal.
- Q 4 is the amount of charge of the electrical signal corresponding to the reference signal 270 degrees slower than the incident light signal.
- the control module 130 resets the control mode according to a detection result of at least one of the existence of the subject and the distance from the subject.
- control module 130 when the presence of the subject is detected, the control module 130 resets the set first control mode to the second control mode. On the other hand, if the presence of the subject is not detected, the control module 130 resets to maintain the set first control mode.
- the preset third control mode is reset to be maintained. If the presence of the subject is detected and the distance to the subject is greater than or equal to the threshold value, the control module 130 may reset the set third control mode to change to the fourth control mode. On the other hand, if the presence of the subject is not detected, the control module 130 resets the set third control mode to change to the fifth control mode.
- the control module 130 controls the output of the light emitting module 110 and the input of the light receiving module 120 according to the reset control mode.
- the control module 130 generates a depth map of the subject based on the input light input according to the reset control mode.
- the process of generating the depth map is the same as that described through the above equation, and thus a detailed description thereof will be omitted.
- the control module 130 when generating the depth map based on the third input light or the fifth input light reflected on the subject, the control module 130 has a higher resolution than the depth map based on the fourth input light through super resolution.
- a depth map having a resolution may be generated.
- the depth map based on the fourth input light has a resolution of QVGA (320x240) level
- the depth map based on the third input light or the fifth input light may have a resolution of VGA (640x480) level.
- the super resolution method that is, the super resolution (SR) method
- SR super resolution
- the SR technique means a technique for estimating x by applying an inverse function of the resolution degradation factors estimated to y k .
- the SR technique can be largely divided into a statistical method and a multiframe method, and the multiframe method can be divided into a spatial partitioning method and a time partitioning method.
- the control module 130 may transmit the depth map of the subject to the connected application.
- the control module 130 may detect the size of the subject through the depth map of the subject, and transmit the detected size information to the connected application.
- FIG. 2 is a flowchart illustrating a first embodiment of a camera control method according to an embodiment of the present invention.
- the light emitting module when the camera operation signal is input, the light emitting module outputs the first output light according to the set first control mode (S205).
- the light receiving module 120 receives the first input light corresponding to the first output light according to the set first control mode (S210).
- control module 130 detects the presence of the subject based on the first input light (S215).
- control module 130 When the presence of the subject is detected, the control module 130 resets the set first control mode to change to the second control mode (S220).
- the light emitting module 110 outputs the second output light and the light receiving module 120 receives the second input light reflected from the subject (S225).
- control module 130 generates a depth map for the subject based on the second input light (S230).
- step S205 if the existence of the subject is not detected, the process proceeds again from step S205 after resetting the first control mode to be maintained. If the subject is not detected for a predetermined number of times, the process may end.
- FIG. 3 is a flowchart illustrating a second embodiment of a camera control method according to an embodiment of the present invention.
- the light emitting module 110 When the camera operation signal is input, the light emitting module 110 outputs the third output light according to the preset third control mode (S305).
- the light receiving module 120 receives the third input light corresponding to the third output light according to the set third control mode (S310).
- control module 130 detects the presence of the subject based on the third input light (S315).
- control module 130 calculates a distance from the subject based on the third input light, and compares the calculated distance with the subject and a threshold value (S320).
- the control module 130 resets to maintain the third control mode (S325).
- the light emitting module 110 outputs the third output light to the subject, and the light receiving module 120 receives the third input light reflected on the subject (S330).
- the control module 130 If the distance to the subject is smaller than the threshold value, the control module 130 resets the set third control mode to be changed to the fourth control mode (S335). According to the reset fourth control mode, the light emitting module 110 outputs the fourth output light to the subject, and the light receiving module 120 receives the fourth input light reflected by the subject (S340).
- the control module 130 resets the preset third control mode to change to the fifth control mode (S345).
- the light emitting module 110 outputs the fifth output light to the subject, and the light receiving module 120 receives the fifth input light reflected by the subject (S350).
- the control module 130 generates a depth map for the projectile based on any one of the third to fifth input light (S355).
- the process of generating the depth map is the same as that described through the above equation, and thus a detailed description thereof will be omitted.
- the control module 130 is based on the fourth input light reflected on the subject through super resolution. A depth map having a higher resolution than the depth map may be generated.
- the control module 130 may calculate the size of the subject based on the depth information of the generated depth map (S360), and transmit the size of the subject to the connected application (S365).
- the connected application may be an application inputting a camera operation signal of step S305.
- FIG. 4 is a flowchart illustrating a third embodiment of a camera control method according to an embodiment of the present invention.
- the camera control method illustrated in FIG. 3 and the camera control method illustrated in FIG. 4 may be implemented together.
- the control module 130 determines the type of the camera operation signal (S410). In this case, the control module 130 may operate the first light emitting module 110 and the first light receiving module 120 or may operate the second light emitting module 110 and the second light receiving module 120 according to the type of the camera operation signal. It can work.
- the control module 130 may operate the first light emitting module 110 and the first light receiving module 120. Then, the control module 130 performs camera control according to the camera control method shown in FIG. For example, when a user inputs a first camera operation signal through a button input or a motion input for 3D face recognition, the control module 130 may include the first light emitting module 110 and the first light receiving module 120. The camera control may be performed according to steps S205 to S230 of FIG. 2.
- the control module 130 may operate the second light emitting module 110 and the second light receiving module 120. Then, the control module 130 performs camera control according to the camera control method shown in FIG. For example, when a user inputs a second camera operation signal through an application to detect the size of an object, the control module 130 operates the second light emitting module 110 and the second light receiving module 120 to Camera control may be performed according to steps S305 to S365.
- Steps S205 to S230 and steps 305 to S355 are described above with reference to FIGS. 2 and 3, and thus detailed descriptions thereof will be omitted.
- FIG. 5 is a view for explaining a control mode according to an embodiment of the present invention.
- a control mode may include first to fifth control modes, may be grouped into first and second control modes, and may be grouped into third to fifth control modes. Can be.
- the camera according to the embodiment of the present invention may be controlled according to any one of the first control mode and the second control mode according to the camera operation signal.
- the first control mode may be a control mode for searching for a subject
- the second control mode may be a control mode for precisely measuring the subject.
- the first control mode may be a control mode for detecting the presence of a face (subject)
- the second control mode is a control mode for generating a depth map for the face (subject). Can be.
- Table 1 below shows the characteristics of the first control mode and the second control mode.
- the light exposure time of the light emitting module 110 in the first control mode may be set shorter than the light exposure time of the second control mode.
- the light exposure time of the first control mode may be set shorter than 0.1 ms
- the light exposure time of the second control mode may be set longer than 0.7 ms.
- the frame rate of the light receiving module 120 in the first control mode may be set smaller than the frame rate of the second control mode.
- the frame rate of the first control mode may be set to 1 fps
- the frame rate of the second control mode may be set to greater than 15 fps.
- the frame rate of the light receiving module 120 may be set to 1 fps to generate only one frame.
- the number of pixels activated of the light receiving module 120 in the first control mode may be set smaller than the number of pixels activated in the second control mode. That is, the angle of view of the light receiving module 120 in the first control mode may be set smaller than the angle of view of the light receiving module 120 in the second control mode.
- 112x86 pixels may be activated to set the angle of view of the light receiving module 120 to be 40 °.
- 224x172 pixels may be activated to enable the angle of view of the light receiving module 120. Can be set to be 80 °.
- the camera according to the embodiment of the present invention operates according to the first control mode, although the depth accuracy is lower than that of the second control mode, a farther subject can be measured with less power. That is, after detecting the presence of the subject with a small power, if it is determined that the subject exists, since the precise photographing is performed according to the second control mode, the power consumption of the camera can be reduced.
- the camera according to the embodiment of the present invention may be controlled according to any one of the third to fifth control mode according to the camera operation signal.
- Table 2 below shows the characteristics of the third to fifth control modes.
- the light exposure time and the modulation frequency of the light emitting module 110 may be set differently.
- the light exposure time of the light emitting module 110 in the fourth control mode may be set smaller than the light exposure time of the third control mode and the fifth control mode.
- the light exposure time of the fourth control mode may be set smaller than 1.5 ms
- the light exposure time of the third control mode and the fifth control mode may be set larger than 1.5 ms. Since the fourth control mode is a control mode for photographing a subject located within 1 m or less, even if the light exposure time is shorter than that of the third and fifth control modes, the light receiving module 120 generates a sufficient amount of light to generate a depth map. It can be secured.
- the modulation frequency is set to the first frequency
- the modulation frequency in the fourth control mode, is set to the second frequency having a value greater than the first frequency
- the modulation frequency in the fifth control mode, is set to the first frequency and It may be set to a second frequency, that is, a combination of two frequencies.
- the third control mode may be set to a modulation frequency of 60MHz
- the fourth control mode may be set to a modulation frequency of 80MHz
- the fifth control mode may be set to a modulation frequency of 60MHz and 80MHz.
- the camera according to the embodiment of the present invention controls the light emitting module 110 and the light receiving module 120 differently according to the distance to the subject through the third to fifth control modes. That is, since the camera is operated by the control module 130 optimized according to the distance to the subject, the camera has an advantage of reducing power consumption.
- FIG. 6 is a diagram for describing a fifth control mode according to an exemplary embodiment of the present invention.
- FIG. 6 shows a process of combining two modulation frequencies. For example, assume that the first frequency is 60 MHz and the second frequency is 80 MHz.
- the maximum distance at which the subject can be measured is determined by the frequency of the output light.
- the output light according to the first frequency of 60 MHz can measure a subject located at a maximum of 1.8657 m, and the output light according to the second frequency of 80 MHz. You can measure a subject located up to 2.4876m. As such, the larger the frequency, the greater the maximum distance at which the subject can be measured. However, in order to increase the frequency, it is necessary to control the blinking cycle of the light emitting module 110 quickly, thereby increasing power consumption.
- the first and second frequencies may be output at the same time to increase the measurement distance of the subject.
- the first frequency and the second frequency have waveforms formed at different periods, and the phases of the two frequencies are different. Overlap may occur.
- two frequencies are output at the same time, it is possible to see a period up to a portion where two frequency phases overlap. That is, when simultaneously outputting a frequency of 60MHz and 80MHz can be regarded as one output light having a frequency of 240MHz. In this case, compared to outputting the output light having a frequency of 240MHz has the advantage that can significantly reduce the power consumption.
- FIG. 7 is a view for explaining an optimized camera operation according to an embodiment of the present invention.
- FIG. 7 illustrates an example for describing a camera operation according to the camera control method of FIG. 3.
- the control module 130 when photographing a small subject such as a ring, a bolt, or a food shown in (a) to (c), the user places the camera close to the subject and photographs the subject.
- the control module 130 generates a depth map by photographing the subject in the fourth control mode based on the presence of the subject in the third control mode and distance information with the subject.
- the control module 130 When photographing a relatively large subject such as a sofa or curtain shown in (d) and (e), the user takes a picture after positioning the camera at a distance or more away from the subject.
- the control module 130 generates a depth map by photographing the subject according to the third control mode.
- control module 130 when shooting for indoor positioning as shown in (f), the user is to shoot after placing the camera at a position far away from the subject.
- the control module 130 generates a depth map by photographing the subject according to the fifth control mode based on the presence information of the subject according to the third control mode.
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Abstract
Description
| 모드 | 거리 범위 | 깊이 정확도 | 수광 모듈 화각 | 광 노출 시간 | 프레임 레이트 | 수광부 및 |
| 제1 제어 모드 | ~100cm | <10% | 40°~60° | <0.1ms | 1 fps | <20mW |
| 제2 제어 모드 | ~60cm | <1% | 80° | >0.7ms | >15 fps | >150mW |
| 모드 | 거리 범위 | 해상도 | 광 노출 시간 | 변조 주파수 | 소비 전력 |
| 제3 제어 모드 | ~2m | VGA | >1.5ms | 60MHz | >50mW |
| 제4 제어 모드 | ~1m | QVGA | <1.5ms | 80MHz | >25mW |
| 제5 제어 모드 | 4m~ | VGA | >1.5ms | 80MHz+60MHz | >100mW |
Claims (10)
- 설정된 제어 모드에 따라 출력광을 출력하는 발광 모듈,상기 제어 모드에 따라 상기 출력광에 대응하는 입력광을 입력받는 수광 모듈,상기 입력광에 기초하여 피사체의 존재 및 상기 피사체와의 거리 중 적어도 하나를 검출하고, 검출 결과에 따라 상기 제어 모드를 재설정하며, 재설정된 상기 제어 모드에 따라 상기 발광 모듈의 출력 및 상기 수광 모듈의 입력을 제어하고, 재설정된 상기 제어 모드에 따라 입력된 입력광에 기초하여 상기 피사체에 대한 깊이맵을 생성하는 제어 모듈을 포함하는 카메라.
- 제1항에 있어서,상기 제어 모드는,제1 제어 모드 및 제2 제어 모드를 포함하고,상기 제1 제어 모드 및 상기 제2 제어 모드는,상기 발광 모듈의 광 노출 시간, 상기 수광 모듈의 프레임 레이트(frame rate) 및 활성화되는 픽셀 수 중 적어도 하나가 서로 다르게 설정되는 카메라.
- 제2항에 있어서,상기 발광 모듈은, 카메라 작동 신호가 입력되면 기 설정된 상기 제1 제어 모드에 따라 제1 출력광을 출력하고,상기 수광 모듈은, 상기 제1 제어 모드에 따라 상기 제1 출력광에 대응하는 제1 입력광을 입력받는 카메라.
- 제3항에 있어서,상기 제어 모듈은,상기 제1 입력광에 기초하여 피사체의 존재를 검출한 결과, 상기 피사체가 검출되면, 상기 제2 제어 모드로 재설정하고, 상기 제2 제어 모드에 따라 상기 발광 모듈이 제2 출력광을 출력하고 상기 수광 모듈이 피사체에 반사된 제2 입력광을 입력받는 카메라.
- 제1항에 있어서,상기 제어 모드는,제3 제어 모드 내지 제5 제어 모드를 포함하고,상기 제3 제어 모드 내지 제5 제어 모드는,상기 발광 모듈의 광 노출 시간 및 변조 주파수 중 적어도 하나가 서로 다르게 설정되는 카메라.
- 제5항에 있어서,상기 제3 제어 모드는, 상기 변조 주파수가 제1 주파수로 설정되고,상기 제4 제어 모드는, 상기 변조 주파수가 상기 제1 주파수보다 큰 값을 가지는 제2 주파수로 설정되고,상기 제5 제어 모드는, 상기 변조 주파수가 상기 제1 주파수 및 상기 제2 주파수로 설정되는 카메라.
- 제6항에 있어서,상기 발광 모듈은, 카메라 작동 신호가 입력되면 상기 제3 제어 모드에 따라 제3 출력광을 출력하고,상기 수광 모듈은, 상기 제3 제어 모드에 따라 제3 출력광에 대응하는 제3 입력광을 입력받는 카메라.
- 제7항에 있어서,상기 제어 모듈은,상기 제3 입력광에 기초하여 피사체의 존재를 검출한 결과,상기 피사체가 검출되면, 상기 제3 입력광에 기초하여 상기 피사체와의 거리를 산출하고,검출 결과 상기 피사체가 검출되지 않으면, 상기 제5 제어 모드로 변경되도록 재설정하며, 재설정된 상기 제5 제어 모드에 따라 상기 발광 모듈이 상기 피사체로 제5 출력광을 출력하고 상기 수광 모듈이 피사체에 반사된 제5 입력광을 입력받는 카메라.
- 제8항에 있어서,상기 제어 모듈은,상기 피사체와의 거리가 임계값보다 크거나 같으면, 상기 제3 제어 모드가 유지되도록 재설정하며, 재설정된 상기 제3 제어 모드에 따라 상기 발광 모듈이 상기 피사체로 제3 출력광을 출력하고 상기 수광 모듈이 상기 피사체에 반사된 제3 입력광을 입력받으며,상기 피사체와의 거리가 상기 임계값보다 작으면, 상기 제4 제어 모드로 변경되도록 재설정하며, 재설정된 상기 제4 제어 모드에 따라 상기 발광 모듈이 상기 피사체로 제4 출력광을 출력하고 상기 수광 모듈이 상기 피사체에 반사된 제4 입력광을 입력받는 카메라.
- 제9항에 있어서,상기 제어 모듈은,상기 피사체에 반사된 제3 내지 제5 입력광 중 하나에 기초하여 상기 피사체에 대한 깊이맵을 생성하되,상기 피사체에 반사된 제3 입력광 또는 제5 입력광에 기초하여 상기 깊이맵을 생성하는 경우, 초고해상기법(super resolution)을 통해 상기 제4 입력광에 기초한 깊이맵보다 높은 해상도를 가지는 상기 깊이맵을 생성하는 카메라.
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| US17/266,411 US11659155B2 (en) | 2018-08-07 | 2019-08-02 | Camera |
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| KR1020180091898A KR102469944B1 (ko) | 2018-08-07 | 2018-08-07 | 카메라 |
| KR10-2018-0091898 | 2018-08-07 |
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| JP2020134464A (ja) * | 2019-02-25 | 2020-08-31 | ソニーセミコンダクタソリューションズ株式会社 | 測距装置、測距方法、並びにプログラム |
| US11888289B2 (en) | 2020-03-30 | 2024-01-30 | Namuga, Co., Ltd. | Light source module allowing differential control according to distance to subject and method for controlling the same |
| KR102476951B1 (ko) * | 2020-03-30 | 2022-12-14 | 주식회사 나무가 | 광 출력장치의 광 출력 최적화 방법 |
| KR20230049902A (ko) * | 2021-10-07 | 2023-04-14 | 삼성전자주식회사 | 거리 센서를 포함하는 전자 장치 및 거리 측정 방법 |
| JP2025106739A (ja) * | 2024-01-04 | 2025-07-16 | キヤノン株式会社 | 情報処理装置、制御方法、プログラム及び撮像システム |
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Also Published As
| Publication number | Publication date |
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| KR102469944B1 (ko) | 2022-11-23 |
| CN112585961A (zh) | 2021-03-30 |
| CN112585961B (zh) | 2024-11-15 |
| KR20200016604A (ko) | 2020-02-17 |
| US11659155B2 (en) | 2023-05-23 |
| US20210329218A1 (en) | 2021-10-21 |
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