JP6510767B2 - Lighting information measuring device - Google Patents

Description

  The present invention relates to an illumination information measurement apparatus.

  For example, in the video production field such as television program production and movie production, video processing and synthesis utilizing digital technology are frequently performed. In particular, in the production of VFX (Visual Effects) that performs advanced CG (Computer Graphics) composition and multiple composition, illumination information is important to generate natural images.

  Conventionally, when synthesizing a real shot image of the foreground with CG of the background, the amount of illumination of the background CG is grasped, the illumination position and the amount of illumination for the real shot of the foreground are determined, and the determined illumination position and amount of illumination are obtained. There is known a composite video generation system in which light from a lighting device (for example, a projector) is indexed to control the amount of illumination of the foreground (for example, see Patent Document 1). According to this synthetic video generation system, it is possible to match the amount of illumination of the background and the amount of illumination of the foreground, so that it is possible to generate a composite video without discomfort with the CG of the background and the video of the subject to be the foreground. Become.

  On the other hand, when synthesizing CG with a live-action image, in many cases, it is performed to adjust CG lighting with an impression of appearance and fit it in a sense. Recently, a spherical mirror or a gray-painted sphere is brought to the shooting site, placed at the position of the subject, photographed with a digital camera, and the photographed image is used as a reference for later post production. Method is also taken.

  In the field of architecture, when designing a building, CAD (Computer Aided Design) is used to simulate the lighting environment such as the type and arrangement of lighting fixtures, and after completion of the building, the lighting condition is measured using a luminometer or the like Then, it is performed to obtain lighting information and to evaluate the lighting environment of the completed building.

JP, 2010-268285, A

  However, in the video production field, it is difficult to produce a high-quality video by adjusting CG lighting with reference to visual impressions and images taken with a digital camera, and CG incorpo- rating CG into live-action videos And the efficiency is poor. In particular, in the field of recent video production, remarkable development of digital technology makes it possible to produce fine CG that can not be photographed in real shooting, so natural CG without such discomfort in real shooting video It is more difficult and time consuming to synthesize as.

  In addition, in the field of construction, it is desirable to quantitatively evaluate whether lighting construction as designed can be performed after the completion of a building, and whether a desired lighting environment is obtained. If such illumination information can be easily acquired and accumulated, it will not only be effectively used as know-how at the time of design, but also a great effect can be expected in realizing efficient work. However, because the illumination information measured using a luminometer or the like is partial, in order to obtain illumination information of the entire surrounding environment, it is necessary to measure the illumination state at a plurality of locations, making the measurement troublesome and time It takes.

  Therefore, it is an object of the present invention made in view of such a point of view to provide an illumination information measuring device capable of easily acquiring accurate illumination information.

An illumination information measuring device according to the present invention for achieving the above object is
And soil over arm-like member,
A rotating portion for rotating the dome-shaped member about a rotation axis passing through the dome surface;
And a measurement unit configured to measure illumination information of illumination light emitted to the dome-like member,
The dome-shaped member has a plurality of light receiving holes formed such that the rotation trajectories by the rotating portion do not intersect with each other, and has a mirror surface on the surface,
The measurement unit receives light incident from each of the plurality of light receiving holes on the rotation circumferential surface of the dome-shaped member by the rotation unit to measure the illumination information, and the measurement unit captures the mirror surface It further comprises a digital camera.

The measurement unit
A plurality of optical fibers each having an incident end coupled to the plurality of light receiving holes and guiding light incident from the corresponding light receiving holes;
A light selection unit that sequentially selects light guided from a plurality of the optical fibers;
And a light sensor for receiving the light selected by the light selection unit.

The plurality of optical fibers are held by the dome-shaped member, with the emission end portions of the plurality of optical fibers being arranged on the same circumference around the rotation axis of the dome-shaped member,
The light selection unit
A light shielding plate having a light selection hole;
The light shielding plate may be rotated about the rotation axis of the dome-shaped member, and a light shielding plate rotation unit may be provided to sequentially emit light guided from the plurality of optical fibers from the light selection hole.

The measurement unit
A plurality of light sensors held by the dome-shaped member may be provided to receive light respectively incident from the plurality of light receiving holes.

  The rotating unit may rotate the dome-shaped member by an ultrasonic motor.

  The light shielding plate rotation unit may rotate the light shielding plate by an ultrasonic motor.

  The measurement unit may further include an information processing control unit that correlates the illumination information with the image information of the mirror surface imaged by the digital camera.

  The measurement unit may further include a distance measurement sensor that measures the distance from the dome-shaped member to the subject.

  The information processing control unit may correlate image information of the mirror surface imaged by the digital camera, the illumination information, and distance measurement information measured by the distance measurement sensor.

  According to the present invention, it is possible to provide an illumination information measurement device capable of easily acquiring accurate illumination information.

It is a side view showing a schematic structure of an important section of a lighting information measuring device concerning a 1st embodiment. It is a top view of the dome-shaped member of FIG. It is a top view of the bottom member of FIG. It is a top view of the light-shielding plate of FIG. It is a figure which shows schematic structure of the optical sensor of FIG. It is a functional block diagram which shows the circuit structure of the illumination information measuring device of FIG. It is a figure which shows schematic structure of the principal part of the illumination information measuring device which concerns on 2nd Embodiment. It is a functional block diagram which shows the circuit structure of the illumination information measuring device of FIG. It is a side view which shows schematic structure of the principal part of the illumination information measuring device which concerns on 3rd Embodiment. It is a figure for demonstrating the usage example of the information acquired by the illumination information measuring device of FIG. It is a side view which shows schematic structure of the principal part of the illumination information measuring device which concerns on 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a side view showing a schematic configuration of a main part of the illumination information measuring device according to the first embodiment. The illumination information measurement device 10 includes a dome shaped member 20. The dome-shaped member 20 is formed in a hemispherical shape, for example, of a transparent or opaque plastic or the like, and is rotatable about a rotation axis C passing through the apex. The dome-shaped member 20 is formed with a plurality of light receiving holes 21 each serving as a measurement position of illumination light. The plurality of light receiving holes 21 are formed such that the rotation trajectories of the dome-shaped members 20 do not intersect with each other. In the present embodiment, as shown also in FIG. 2 as a plan view of the dome-like member 20, a case where ten light receiving holes 21 are formed in a spiral shape is illustrated. The plurality of light receiving holes 21 may be formed along one or a plurality of meridians without being limited to the spiral shape. Further, the number of the light receiving holes 21 is not limited to ten, and can be appropriately set according to the size of the dome-like member 20 and the like. As the number of the light receiving holes 21 increases, illumination information can be acquired more finely.

  The incident end 31 a of the optical fiber 30 for guiding the illumination light incident from the light receiving hole 21 is coupled to each light receiving hole 21 on the inner surface side of the dome-shaped member 20. In addition, in FIG. 1, in order to make a figure clear, the one part optical fiber 30 and the entrance end 31a are shown. The incident end 31 a may be provided with a lens for adjusting the illumination area to be emitted from the corresponding light receiving hole 21. The emission end 31 b of each optical fiber 30 is held by the bottom surface member 22 of the dome-shaped member 20. The bottom surface member 22 is made of, for example, opaque metal or the like, and a plurality of optical fibers corresponding to the number of optical fibers 30 on the same circumference centering on the rotation axis C of the dome shaped member 20 as shown in FIG. The openings 23 are formed, and the emission end 31 b of the optical fiber 30 is coupled to each of the openings 23.

  The dome-shaped member 20 is rotated about the rotation axis C by the ultrasonic motor 40. The ultrasonic motor 40 constitutes a rotating portion, and has a ring-shaped rotor 41 and a ring-shaped stator 42 facing each other. The bottom member 22 of the dome-shaped member 20 is coupled to the rotor 41. The stator 42 is supported by the upper surface 51 of the housing 50 via the cylindrical support member 43. The inner diameters of the rotor 41 and the stator 42 are such that all the openings 23 formed in the bottom surface member 22 of the dome-shaped member 20 enter the inner diameters of the rotor 41 and the stator 42.

  In the support member 43, between the upper surface 51 of the housing 50 and the ultrasonic motor 40, the light shielding plate 60 and the ultrasonic motor 70 that constitute the light selection unit are disposed. The ultrasonic motor 70 constitutes a light shielding plate rotating portion for rotating the light shielding plate 60, includes a ring-shaped rotor 71 and a ring-shaped stator 72, and is disposed concentrically with the ultrasonic motor 40. Ru. The light shielding plate 60 is supported by the rotor 71, and the stator 72 is supported by the upper surface 51 of the housing 50. The inner diameters of the rotor 71 and the stator 72 have the size that all the openings 23 formed in the bottom surface member 22 of the dome-shaped member 20 enter the inner diameters of the rotor 71 and the stator 72, similarly to the ultrasonic motor 40. doing.

  One light selection hole 61 is formed in the light shielding plate 60 as shown in a plan view of FIG. The light selection hole 61 has substantially the same size as the opening 23 formed in the bottom surface member 22 of the dome-shaped member 20, and is formed at the same distance from the rotation axis C of the dome-shaped member 20 as the opening 23. Thus, when the light shielding plate 60 is rotated about the rotation axis C of the dome-shaped member 20 by the ultrasonic motor 70, the light selection holes 61 sequentially face the plurality of openings 23 of the bottom surface member 22 of the dome-shaped member 20. The illumination light guided from each optical fiber 30 is sequentially selected from the light selection holes 61 and emitted.

  An opening 52 for passing illumination light emitted through the light selection hole 61 of the light shielding plate 60 is formed on the upper surface 51 of the housing 50, and one of the interiors receiving the illumination light incident thereon via the opening 52 is formed. An optical sensor 80 is disposed. In addition, on the inner peripheral side of the stator 72 of the ultrasonic motor 70, a light deflection member 90 such as a reflection mirror or a prism for guiding the illumination light transmitted through the light selection hole 61 of the light shielding plate 60 to the light sensor 80 as necessary. Be placed. A lens may be attached to the light selection hole 61 of the light shielding plate 60 to condense the illumination light incident through the opening 23 on the light sensor 80.

  FIG. 5 is a view showing a schematic configuration of the light sensor 80. As shown in FIG. The optical sensor 80 includes a white filter 81, a lens group 82, a beam splitter 83, a light receiving element 84, a spectroscope 85, and a signal processing unit 86. The optical sensor 80 causes the incident illumination light to be incident on the beam splitter 83 through the white filter 81 and the lens group 82 and split it into transmitted light and reflected light, and the transmitted light is received by the light receiving element 84 to disperse the reflected light. The light is incident on the

  The outputs of the light receiving element 84 and the spectroscope 85 are input to the signal processing unit 86, respectively. The signal processing unit 86 measures the brightness (illuminance) of the incident illumination light based on the output of the light receiving element 84, and the color of the illumination light (based on the spectrum output for each wavelength component of the illumination light obtained from the spectroscope 85). Measure the color temperature).

  In the illumination information measuring device 10 shown in FIG. 1, the light shielding process is appropriately performed so that only the illumination light collected from each light receiving hole 21 of the dome-shaped member 20 is incident on the light sensor 80.

  FIG. 6 is a functional block diagram showing a circuit configuration of the illumination information measuring device 10 according to the present embodiment. The illumination information measurement device 10 includes a motor control unit 101 that controls the drive of the ultrasonic motor 40, a motor control unit 102 that controls the drive of the ultrasonic motor 70, an interface (IF) circuit 103 of the optical sensor 80, and the whole. And an information processing control unit 104 that controls the operation of The information processing control unit 104 can be configured as software executed on a PC using, for example, a personal computer (PC), or can be configured by a dedicated processor (for example, a DSP (digital signal processor)).

The information processing control unit 104 drives and controls the ultrasonic motor 40 by the motor control unit 101 so as to intermittently rotate the dome-shaped member 20 at predetermined angles, for example, every 10 degrees, and thereby the dome-shaped member 20 is Rotate. Further, the information processing control unit 104 drives and controls the ultrasonic motor 70 by the motor control unit 102 so as to rotate the light shielding plate 60 once at each intermittent rotation stop position of the dome-shaped member 20 by the ultrasonic motor 40. . Thereby, the illumination light guided from the plurality of optical fibers 30 is sequentially selected and incident on the light sensor 80. The information processing control unit 104, as the light selective hole 61 of the light shielding plate 60 is sequentially opposed to the plurality of openings 23 on the same circumference which is formed on the bottom member 22 of the dome-shaped member 20, the ultrasonic motor 70 May be intermittently rotated or may be rotated continuously.

  In addition, the information processing control unit 104 receives illumination light from each optical fiber 30 obtained from the optical sensor 80, that is, luminance data and color data of the illumination light corresponding to each measurement position through the IF circuit 103, and incorporates the built-in memory. Store in a portable external memory such as an SD memory card. Alternatively, it is transmitted from the information processing control unit 104 to a predetermined server via the network and stored.

  As described above, the information processing control unit 104 rotates the dome-shaped member 20 intermittently at a predetermined angle and makes one rotation, and rotates the light shielding plate 60 one rotation at each intermittent rotation stop position. It is possible to obtain information of illumination light from each direction on the rotational circumferential surface of the bar-like member 20. Therefore, in the present embodiment, the measurement unit is configured to include the optical fiber 30, the light shielding plate 60, the ultrasonic motor 70, the light sensor 80, and the information processing control unit 104.

  The illumination information measurement device 10 according to the present embodiment is installed, for example, at a subject position or in the vicinity thereof at a shooting site such as television program production or movie production. This makes it possible to easily obtain accurate illumination information around the subject in real space. Therefore, when performing CG synthesis in post production, it becomes possible to set the illumination condition irradiated to the object on the CG software in the same way as in the real space based on the illumination information acquired by the illumination information measurement device 10, VFX In video production and the like, CG can be synthesized efficiently and precisely as a natural video in a short time, without making a CG look like a real shot video. Therefore, since the quality of the generated video can be remarkably improved, it becomes possible to produce effective video in various programs such as drama programs, information programs, and news programs, making the program attractive to viewers. Can contribute significantly to

  It can also be applied to the evaluation of the lighting environment in the field of architecture. For example, by arranging the illumination information measuring device 10 in a desired space in the building after the building is completed and the lighting construction is completed, accurate ambient illumination information can be obtained. In this way, it is possible to quantitatively evaluate, for example, whether the lighting construction as designed can be performed or whether the desired lighting environment is obtained. In addition, by storing the design data of the building and the illumination information measured after completion in association, the accumulated information can be effectively used as know-how at the next design, which contributes to the realization of efficient work. be able to.

Second Embodiment
FIGS. 7 (a), (b) and (c) are a front view, a plan view and a right side view showing a schematic configuration of the main part of the illumination information measuring apparatus according to the second embodiment. The differences from the first embodiment will be mainly described below. In the illumination information measurement device 11 according to the present embodiment, the dome-like member 20 is formed in an arch shape by a plurality of plate-like members 24 and a semicircular member 25 supporting them. FIG. 7 illustrates the case where six plate members 24 are provided. Each plate-like member 24 is provided with a light receiving hole 21 and a light sensor 80 for receiving illumination light transmitted through the light receiving hole 21. As in the case of the first embodiment, the light receiving holes 21 are formed such that the rotation loci of the dome-shaped members 20 do not intersect with each other. Moreover, the illumination area light-collected from each light-collection hole 21 can be adjusted with the lens group 82 (refer FIG. 5) of each corresponding optical sensor 80. FIG.

  The dome-like member 20 is supported by the rotor 41 of the ultrasonic motor 40 via the support member 26. The stator 42 of the ultrasonic motor 40 is fixed to the base 110.

  FIG. 8 is a functional block diagram showing a circuit configuration of the illumination information measuring device 11 according to the present embodiment. The plurality of light sensors 80 are connected to the information processing control unit 104 via the IF circuit 103. Further, the driving of the ultrasonic motor 40 is controlled by the information processing control unit 104 via the motor control unit 101. Therefore, in the present embodiment, the measurement unit is configured to include the plurality of light sensors 80 and the information processing control unit 104.

The illumination information measurement device 11 according to the present embodiment makes one turn while intermittently rotating the dome-like member 20 every predetermined angle, for example, every 10 degrees. Then, at each intermittent rotation stop position, the illumination information of the brightness and color of the illumination light incident from the corresponding light receiving holes 21 is simultaneously measured by the plurality of light sensors 80, and the measurement data thereof is taken into the information processing control unit 104. . Therefore, according to this embodiment, in addition to the effects of the first embodiment, it is possible to obtain the Ri迅 speed by the information of the illumination light from each direction on the rotational circumference of the dome-shaped member 20.

Third Embodiment
FIG. 9 is a side view showing a schematic configuration of a main part of the illumination information measuring device according to the third embodiment. In the illumination information measurement apparatus 10 according to the first embodiment, the illumination information measurement apparatus 12 according to the present embodiment forms the surface of the dome-like member 20 as the mirror surface 27 and the ambient image reflected on the mirror surface 27 is the dome Images are taken by the digital camera 120 from above the rod-like member 20. The digital camera 120 is supported by the housing 50 via the stay member 121.

  The digital camera 120 has a photographing operation controlled by the information processing control unit 104 illustrated in FIG. 6, and image information of a captured image is taken into the information processing control unit 104. Therefore, in the present embodiment, the measurement unit is configured to include the digital camera 120. The other configuration and operation are the same as those of the first embodiment, and thus the description thereof is omitted.

  The illumination information measurement device 12 according to the present embodiment captures an ambient image captured on the surface of the dome-like member 20 with the digital camera 120 according to the measurement time of the illumination information by the optical sensor 80, and obtains illumination information and image information. And correlate with. In this way, based on the image information, it is possible to grasp the environment around the subject in the real space and the position of the illumination light source in the time corresponding to the measurement time of the illumination information. Although the daylighting hole 21 formed in the dome-like member 20 is exaggerated and shown to have a large diameter in the figure, since it is actually a small diameter, there is no hindrance in determining the surrounding environment, and the position of the illumination light source It is possible to identify correctly.

  Therefore, when performing CG synthesis in post production, assuming that the origin in the real space is the installation position of the illumination information measuring device 10, the position of the illumination light source is an azimuth angle in the polar coordinate system xyz as shown in FIG. It can be expressed by the position P of θ, elevation angle φ. Further, as shown in FIG. 10 (b), if the origin of the illumination light source in the virtual space xyz is made to coincide with the origin in the real space as shown in FIG. Represented by position P. As a result, it becomes possible to set the illumination condition applied to the object on the CG software in the same way as in the real space based on the illumination information acquired by the illumination information measurement device 12, and in VFX video production etc. CG can be synthesized as a more natural and more natural image.

Fourth Embodiment
FIG. 11 is a side view showing a schematic configuration of a main part of the illumination information measuring device according to the fourth embodiment. The illumination information measurement device 13 according to the present embodiment is installed at a position away from the subject 130 (for example, the position of a television camera), and the illumination information measurement device 12 according to the third embodiment has a dome shape. It further includes a distance measuring sensor 140 that measures the distance from the member 20 to the subject 130. The distance measuring sensor 140 may be of a known configuration such as an optical type or an ultrasonic type, and is installed at a position that does not interfere with photographing of the dome-shaped member 20 by the digital camera 120. FIG. 11 illustrates the case where the distance measurement sensor 140 is installed on the support member 43 that supports the dome-like member 20.

  The distance measurement sensor 140 has its measurement operation controlled by the information processing control unit 104 shown in FIG. 6, and the measured distance measurement information is taken into the information processing control unit 104. Therefore, in the present embodiment, the measurement unit is configured to include the distance measurement sensor 140. The other configuration and operation are the same as those of the third embodiment, and thus the description thereof is omitted.

  The illumination information measurement device 13 according to the present embodiment captures an ambient image captured on the surface of the dome-shaped member 20 with the digital camera 120 according to the measurement time of the illumination information by the optical sensor 80, and also uses the distance measurement sensor 140. The distance to the subject 130 is measured, and the illumination information, the image information, and the distance measurement data are correlated. In this way, accurate illumination information in the real space around the installation position can be easily obtained from the light sensor 80, and the surrounding environment and the position of the illumination light source 150 can be grasped from the image information by the digital camera 120. . Further, it is possible to obtain distance measurement information (depth information) of a distance D from the measurement point (installation position) to the object 130 at a time corresponding to the measurement time of the illumination information and the acquisition time of the image information from the distance measurement sensor 140 it can.

  Therefore, when performing CG synthesis in post production, if the height H of the main illumination light source 150 is separately measured and input to CG software in advance as a conversion coefficient, the measurement point and the target point (the position of the object 130) The illumination information can be determined by calculation even when the distance. Thereby, the same effect as that of the first embodiment can be obtained. Further, since the illumination information measurement device 13 according to the present embodiment has the distance measurement sensor 140, it can be installed at an arbitrary position, and there is also an advantage that the freedom of installation can be improved.

  The present invention is not limited to the above embodiment, and many modifications and variations are possible. For example, the illumination information measured by the light sensor 80 may be only luminance or only color. Moreover, you may comprise the rotation part which rotates the dome-shaped member 20 using not only the ultrasonic wave motor 40 but an electrostatic motor and an electromagnetic motor. For example, a gear may be provided on the bottom outer periphery of the dome-shaped member 20, and the pinion gear attached to the output shaft of the electromagnetic motor may be engaged with this gear to rotate the dome-shaped member 20. The same applies to the light shielding plate rotating portion that rotates the light shielding plate 60. Further, in the second embodiment, the dome-shaped member 20 may be coupled to the rotation shaft of the electromagnetic motor. Further, the illumination information and the image information acquired in the third embodiment, and the illumination information, the image information and the distance measurement information acquired in the fourth embodiment do not necessarily have to be correlated on the illumination information measuring device side. By correlating each information with the acquired time information, correlation may be made on CG software.

DESCRIPTION OF SYMBOLS 10, 11, 12, 13 Illumination information measurement apparatus 20 Dome-like member 21 Daylighting hole 27 Mirror surface 30 Optical fiber 40 Ultrasonic motor 60 Shading plate 61 Light selection hole 70 Ultrasonic motor 80 Optical sensor 104 Information processing control part 120 Digital camera 140 Range sensor

Claims (9)

A dome-shaped member,
A rotating portion for rotating the dome-shaped member about a rotation axis passing through the dome surface;
And a measurement unit configured to measure illumination information of illumination light emitted to the dome-like member,
The dome-shaped member has a plurality of light receiving holes formed such that the rotation trajectories by the rotating portion do not intersect with each other, and has a mirror surface on the surface,
The measurement unit receives light incident from each of the plurality of light receiving holes on the rotation circumferential surface of the dome-shaped member by the rotation unit to measure the illumination information, and the measurement unit captures the mirror surface Further comprising a digital camera
Lighting information measuring device. In the illumination information measurement device according to claim 1 ,
The illumination information measurement device according to claim 1, wherein the measurement unit further includes an information processing control unit that correlates the illumination information with the image information of the mirror surface imaged by the digital camera. In the illumination information measurement device according to claim 2 ,
The said measurement part is further provided with the ranging sensor which measures the distance from the said dome-shaped member to a to-be-photographed object, The illumination information measuring device characterized by the above-mentioned. In the illumination information measurement device according to claim 3 ,
The information processing control unit correlates the image information of the mirror surface imaged by the digital camera, the illumination information, and the distance measurement information measured by the distance measurement sensor. Measuring device. The illumination information measuring device according to any one of claims 1 to 4 .
The measurement unit
A plurality of optical fibers each having an incident end coupled to the plurality of light receiving holes and guiding light incident from the corresponding light receiving holes;
A light selection unit that sequentially selects light guided from a plurality of the optical fibers;
And a light sensor for receiving the light selected by the light selection unit. In the illumination information measurement device according to claim 5 ,
The plurality of optical fibers are held by the dome-shaped member, with the emission end portions of the plurality of optical fibers being arranged on the same circumference around the rotation axis of the dome-shaped member,
The light selection unit
A light shielding plate having a light selection hole;
And a light shielding plate rotation unit configured to rotate the light shielding plate about the rotation axis of the dome-shaped member to sequentially emit light guided from the plurality of optical fibers from the light selection hole. Lighting information measuring device characterized by. The illumination information measuring device according to any one of claims 1 to 4 .
The measurement unit
An illumination information measuring apparatus comprising: a plurality of light sensors held by the dome-shaped member so as to receive light respectively incident from a plurality of the light receiving holes. In the illumination information measuring device according to any one of claims 1 to 7 ,
The said rotation part rotates the said dome shaped member by an ultrasonic motor, The illumination information measuring device characterized by the above-mentioned. In the illumination information measurement device according to claim 6 ,
The illumination information measuring device according to claim 1, wherein the light shielding plate rotating unit rotates the light shielding plate by an ultrasonic motor.

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