WO2018074520A1 - Interphone system, interphone main device, interphone sub-device, and program - Google Patents

Interphone system, interphone main device, interphone sub-device, and program Download PDF

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Publication number
WO2018074520A1
WO2018074520A1 PCT/JP2017/037718 JP2017037718W WO2018074520A1 WO 2018074520 A1 WO2018074520 A1 WO 2018074520A1 JP 2017037718 W JP2017037718 W JP 2017037718W WO 2018074520 A1 WO2018074520 A1 WO 2018074520A1
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WIPO (PCT)
Prior art keywords
image
unit
distortion
correction
distortion correction
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Application number
PCT/JP2017/037718
Other languages
French (fr)
Japanese (ja)
Inventor
さつき 石田
山中　睦裕
利春 竹ノ内
Original Assignee
パナソニックＩｐマネジメント株式会社
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Priority to JP2018546384A priority Critical patent/JP6778907B2/en
Publication of WO2018074520A1 publication Critical patent/WO2018074520A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • 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
    • H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
    • H04N23/661—Transmitting camera control signals through networks, e.g. control via the Internet
    • H04N23/662—Transmitting camera control signals through networks, e.g. control via the Internet by using master/slave camera arrangements for affecting the control of camera image capture, e.g. placing the camera in a desirable condition to capture a desired image
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Definitions

  • the present invention relates to an interphone system, an interphone master device, an interphone slave device, and a program, and more particularly, to an interphone system, an interphone master device, an interphone slave device, and a program having an imaging function.
  • the intercom system described in Patent Literature 1 includes an interphone slave unit (slave unit) and an interphone master unit (parent unit) connected to the interphone slave unit via a signal transmission system.
  • the intercom handset has an image pickup unit (television camera) equipped with a wide-angle lens and a microphone that collects the voice of a visitor.
  • the interphone master unit includes a display unit (monitor TV) that displays an image from the interphone slave unit, a speaker that outputs sound from the interphone slave unit, and an image correction unit (image distortion correction unit) that corrects image distortion.
  • an image with less distortion can be obtained by correcting image distortion caused by using a wide-angle lens by an image correcting unit and projecting the corrected image on a display unit.
  • the present invention has been made in view of the above problems, and an object thereof is to provide an interphone system, an interphone master unit, an interphone slave unit, and a program that can reduce image distortion and reduce visual discomfort. .
  • the interphone system is an interphone system in which an interphone master unit and an interphone slave unit are configured to be able to communicate with each other.
  • the intercom system includes an image correction unit that performs a distortion correction process for correcting distortion of an image captured by the imaging unit of the interphone slave unit.
  • the image correction unit is configured to divide a region to be subjected to distortion correction in the image into a plurality of regions in the distortion correction processing, and perform different distortion correction on each of the plurality of regions. Yes.
  • the interphone master according to one aspect of the present invention is used in the above-described interphone system.
  • the intercom handset according to one aspect of the present invention is used in the above-described intercom system.
  • the program according to an aspect of the present invention causes a computer to function as the image processing unit in the above intercom system.
  • FIG. 1 is a block diagram of an intercom system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing an installation example of the interphone slave unit according to the embodiment of the present invention.
  • FIG. 3A is a schematic diagram of an image before distortion correction displayed on the display unit of the intercom master according to Comparative Example 1.
  • FIG. 3B is a schematic diagram of an image after distortion correction that is displayed on the display unit of the interphone master unit.
  • 4A is a schematic diagram of an image before distortion correction displayed on the display unit of the intercom master according to Comparative Example 2.
  • FIG. FIG. 4B is a schematic diagram of an image after distortion correction displayed on the display unit of the interphone master unit.
  • FIG. 5A is a schematic view of an image before distortion correction displayed on the display unit of the intercom master according to the embodiment of the present invention.
  • FIG. 5B is a schematic diagram of an image after distortion correction that is displayed on the display unit of the interphone master unit.
  • 6A to 6C are schematic diagrams illustrating an example of division of an image displayed on the display unit of the intercom master according to Modification 1 of the embodiment of the present invention.
  • FIG. 7 is a schematic diagram illustrating an installation example of the intercom slave device according to the second modification of the embodiment of the present invention.
  • the interphone system 10 of the present embodiment includes an interphone master unit 1 and an interphone slave unit 2 as shown in FIG.
  • This embodiment demonstrates as an example the case where the intercom system 10 is an intercom system for apartment houses.
  • each of the visitors 100A and 100B is referred to as “visitor 100”.
  • the intercom base unit 1 is an indoor base unit installed in a dwelling unit (indoor) of an apartment house.
  • the intercom handset 2 is a lobby intercom installed in a common space (lobby) of an apartment house.
  • the interphone master unit 1 and the interphone slave unit 2 are configured to be able to communicate with each other. Thereby, in the intercom system 10, a call can be made between the interphone master unit 1 and the interphone slave unit 2.
  • the intercom handset 2 is provided with an imaging unit 21, and the intercom base unit 1 is provided with a display unit 12. Thereby, in the intercom system 10, an image of a visitor or the like captured by the image capturing unit 21 of the interphone slave unit 2 can be displayed on the display unit 12 of the interphone master unit 1.
  • the interphone slave unit 2 includes an imaging unit 21, a slave unit communication unit 22, an image correction unit 23, a slave unit control unit 24, an operation unit 25, and a storage unit 26. ing.
  • the imaging unit 21 includes an imaging element 211 that images a specific area, and a lens 212 that can be tilted with respect to the imaging element 211.
  • the imaging unit 21 is a camera for imaging a subject such as a visitor. Therefore, the imaging area (field of view) of the imaging unit 21 is set in front of the interphone slave unit 2 so that at least the face of the visitor is reflected in the image when the visitor operates the interphone slave unit 2.
  • the imaging unit 21 is a camera that captures a moving image, but the imaging unit 21 may be a camera (still camera) that captures a still image.
  • the imaging unit 21 is a color camera that captures a color image, but the imaging unit 21 may be a monochrome camera that captures a monochrome image.
  • the common space of the apartment house is a specific area.
  • the specific area is not limited to the common space of the apartment house.
  • the entrance of each dwelling unit is the specific area.
  • the imaging element 211 is a two-dimensional image sensor such as a CCD (Charge Coupled Devices) image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) image sensor.
  • the imaging unit 21 forms an image of light from the subject on the imaging surface (light receiving surface) of the imaging device 211 by the lens 212, and converts the light from the subject into an electrical signal (image signal) by the imaging device 211. Therefore, the image captured by the imaging unit 21 is output from the imaging unit 21 as an image signal.
  • the imaging unit 21 is configured to generate a digital image signal in YUV format from the output signal of the imaging element 211 and output the digital image signal.
  • the lens 212 is a fish-eye lens (super wide angle lens) having an angle of view of, for example, 180 degrees or more, and is rotatable (tiltable) with respect to the image sensor 211 in a plane orthogonal to the left-right direction (direction perpendicular to the paper surface of FIG. ). Therefore, the optical axis P1 (see FIG. 2) of the imaging unit 21 including the imaging element 211 and the lens 212 changes according to the tilt angle ⁇ 1 (see FIG. 7) of the lens 212.
  • the slave unit communication unit 22 is a communication interface for communicating with the interphone master unit 1.
  • the slave unit communication unit 22 is electrically connected to the interphone master unit 1 via a two-wire transmission path 4 (indicated by one line in FIG. 1) made of, for example, a twisted pair line.
  • mobile_unit communication part 22 contains the transmission part 221.
  • the transmission unit 221 transmits the image signal of the image captured by the imaging unit 21 to the intercom base unit 1. Further, the slave unit communication unit 22 can communicate bidirectionally with the interphone master unit 1 so that audio signals and control signals can be transmitted bidirectionally between the interphone slave unit 2 and the interphone master unit 1. It is configured.
  • the image correction unit 23 is configured to perform distortion correction processing for correcting image distortion on the image signal output from the imaging unit 21.
  • the slave unit communication unit 22 receives an image (image signal) output from the image correction unit 23. Therefore, the transmission unit 221 transmits the image signal corrected by the image correction unit 23 to the intercom base unit 1 instead of the image signal output from the imaging unit 21.
  • the image correction unit 23 is realized by, for example, a DSP (Digital Signal Processor) or an FPGA (Field-Programmable Gate Array). The distortion correction processing of the image correction unit 23 will be described later.
  • the operation unit 25 receives an operation for calling from a visitor.
  • a predetermined operation for example, a push operation
  • the interphone handset 2 sends a control signal (call signal) for calling a resident in the residence from the handset communication unit 22 to the interphone base unit.
  • the operation unit 25 is configured to be able to input an inclination angle ⁇ 1 of the lens 212 with respect to the image sensor 211 and an inclination angle ⁇ 2 of the mounting surface 31 of the mounting base 3 (see FIG. 2) to which the interphone slave unit 2 is mounted. . These inclination angles ⁇ 1 and ⁇ 2 are input by the installer when the interphone system 10 is installed.
  • the storage unit 26 is a rewritable memory and is preferably a non-volatile memory.
  • the storage unit 26 is configured to record an image captured by the imaging unit 21.
  • a plurality of distortion correction patterns that are performed on the image captured by the imaging unit 21 are recorded in the storage unit 26 in advance.
  • a first distortion correction pattern, a second distortion correction pattern, and a third distortion correction pattern are recorded in advance in the storage unit 26 as a plurality of distortion correction patterns.
  • the first distortion correction pattern distortion correction is performed in the left-right direction (horizontal direction) of the image.
  • the second distortion correction pattern distortion correction is performed in the horizontal direction and vertical direction (vertical direction) of the image.
  • the correction strength refers to the degree of stretching in at least one of the horizontal direction and the vertical direction. For example, when the correction strength in the horizontal direction is strong, the correction is greatly extended in the horizontal direction.
  • the slave unit control unit 24 controls each component of the intercom slave unit 2.
  • the slave unit control unit 24 is composed of, for example, a microcomputer having a CPU (Central Processing Unit) and a memory as main components, and the microcomputer executes a program stored in the memory so that the microcomputer can control the slave unit. It functions as the unit 24.
  • the program executed by the CPU is recorded in advance in the memory of the microcomputer, but may be provided by being recorded on a non-temporary recording medium such as a memory card or provided through an electric communication line. Good.
  • the intercom handset 2 further includes a housing 20 as shown in FIG.
  • the casing 20 is formed in a rectangular box shape with a small thickness, and each component of the intercom slave device 2 including the imaging unit 21 and the transmission unit 221 is accommodated in the casing 20.
  • the intercom base unit 1 includes a base unit communication unit 11, a display unit 12, a base unit control unit 13, an image processing unit 14, and an operation unit 15.
  • the base unit communication unit 11 is a communication interface for communicating with the interphone handset 2.
  • the base unit communication unit 11 is electrically connected to the handset communication unit 22 of the interphone handset 2 via the transmission path 4.
  • Base unit communication unit 11 includes a reception unit 111.
  • the reception unit 111 receives the image signal transmitted from the transmission unit 221 of the intercom slave device 2.
  • the base unit communication unit 11 is bidirectional with the interphone slave unit 2 (slave unit communication unit 22) so that audio signals and control signals can be transmitted bidirectionally with the interphone base unit 1. It is configured to be able to communicate.
  • Display unit 12 displays an image based on the image signal.
  • the display unit 12 is a liquid crystal display, for example. Further, when the intercom base unit 1 includes a touch panel, the touch panel display serves as both the display unit 12 and the operation unit 15.
  • the image processing unit 14 receives the image signal output from the receiving unit 111 and performs image processing.
  • An image (image signal) output from the image processing unit 14 is input to the display unit 12. Therefore, the display unit 12 displays an image based on the image signal that has been subjected to image processing by the image processing unit 14 instead of an image based on the image signal received by the receiving unit 111.
  • the image processing unit 14 is realized by a DSP or FPGA, for example.
  • the operation unit 15 receives an operation of a resident in the dwelling unit.
  • a control signal for calling a resident from the intercom handset 2
  • a predetermined operation for example, a push operation
  • the base unit control unit 13 controls each component of the intercom base unit 1.
  • the base unit control unit 13 is composed of, for example, a microcomputer mainly composed of a CPU and a memory, and the microcomputer functions as the base unit control unit 13 when the CPU executes a program stored in the memory.
  • the program executed by the CPU is recorded in advance in the memory of the microcomputer, but may be provided by being recorded on a non-temporary recording medium such as a memory card or provided through an electric communication line. Good.
  • FIG. 2 is a schematic diagram showing an installation example of the intercom slave device 2 of the present embodiment.
  • the common space 5 of the apartment house is provided with a mounting base 3 formed in a rectangular parallelepiped shape that is long in the vertical direction (vertical direction).
  • the mounting base 3 has a mounting surface 31 to which the interphone slave unit 2 is mounted.
  • the attachment surface 31 is inclined with respect to a horizontal plane parallel to the ground, and the inclination angle is ⁇ 2. Therefore, in a state where the interphone slave unit 2 is attached to the attachment surface 31 of the mount 3, the interphone slave unit 2 (housing 20) is also inclined at the inclination angle ⁇ 2 with respect to the horizontal plane.
  • the center axis P ⁇ b> 2 of the image sensor 211 is parallel to the normal direction of the attachment surface 31. Further, in the present embodiment, in a plane orthogonal to the left-right direction (direction perpendicular to the paper surface of FIG. 2) so that the direction of the optical axis P1 of the imaging unit 21 including the imaging element 211 and the lens 212 is the horizontal direction. The lens 212 is rotated clockwise with respect to the image sensor 211. Therefore, in the present embodiment, the optical axis P1 of the imaging unit 21 and the central axis P2 of the imaging element 211 do not match.
  • the viewing angle of the imaging unit 21 in a plane orthogonal to the left-right direction is ⁇ 1 (see FIG. 2).
  • the lens 212 is tilted (rotated) so that the direction of the optical axis P1 of the imaging unit 21 is the horizontal direction, a part of the housing 20 of the intercom slave unit 2 is in the imaging area of the imaging unit 21.
  • the viewing angle ⁇ 1 of the imaging unit 21 is set so as to be included in FIG.
  • FIG. 3A and 3B are schematic diagrams of an image 121 displayed on the display unit 12 of the intercom master device 1 according to the comparative example 1.
  • FIG. 1 the lens 212 of the imaging unit 21 is a fisheye lens. Therefore, in the image 121 imaged by the imaging unit 21, so-called barrel-shaped distortion, which is distorted so that the center part swells, occurs as shown in FIG. 3A.
  • the visitor 100A Since the visitor 100A is located at the center of the image 121 as shown in FIG. 3A, there is little distortion. On the other hand, since the visitor 100B is located on the left side of the image 121, it is curved outward (leftward).
  • An automatic door 200 having two doors 200A and 200B is located behind the visitor 100A. In each of the two doors 200A and 200B, the upper boundary lines 201 and 201 are curved outward (upward). Further, the left boundary line 202 of the one door 200A (left side in FIG. 3A) and the right boundary line 202 of the other door 200B are also curved outward (leftward or rightward). Furthermore, in the example shown in FIG. 3A, a part of the housing 20 of the intercom slave device 2 is reflected in the lower part of the image 121.
  • the distortion of the image 121 is corrected as illustrated in FIG. 3B.
  • horizontal distortion correction refers to correction that extends in the horizontal direction so that distortion of a line extending in the vertical direction (vertical direction) in the image 121 is reduced.
  • the distortion of the visitor 100B located on the left side of the image 121 is reduced, and the distortion of the left or right boundary line 202 of each of the two doors 200A and 200B is reduced.
  • the distortion of the boundary line 201 on the upper side of the two doors 200A and 200B remains, and the reflection of the housing 20 remains as it is.
  • FIG. 4A and 4B are schematic diagrams of an image 121 displayed on the display unit 12 of the intercom master device 1 according to the comparative example 2.
  • FIG. 4A is the same as FIG. 3A described above, and the description of FIG. 4A is omitted here.
  • the distortion correction unit 23 performs distortion correction (two-dimensional distortion correction) in the horizontal direction (left-right direction of the image 121) and the vertical direction (up-down direction of the image 121) with respect to the image 121 (arrow in FIG. 4A) As shown in FIG. 4B, the distortion of the image 121 is corrected.
  • the two-dimensional distortion correction refers to correction that extends in the vertical direction and the horizontal direction so that distortion between a line extending in the vertical direction and a line extending in the horizontal direction in the image 121 is reduced.
  • the distortion of the upper boundary line 201 and the left or right boundary line 202 in each of the two doors 200A and 200B is reduced, and the reflection of the casing 20 of the intercom handset 2 is eliminated.
  • the housing of the interphone slave unit 2 is used. A part of the body 20 is reflected in the image 121 or becomes an unnatural image. That is, when the same distortion correction is performed on the entire image 121, it may not be possible to achieve both reduction in image distortion and reduction in visual discomfort.
  • the image correction unit 23 divides the image 121 into a plurality of regions (two in the illustrated example) (first region 1211 and second region 1212), as shown in FIGS. 5A and 5B. Different distortion corrections are performed on each of the plurality of regions.
  • the distortion correction processing of the image correction unit 23 of the present embodiment will be specifically described with reference to FIGS. 5A and 5B.
  • FIG. 5A is a schematic diagram of an image 121 imaged by the imaging unit 21 as in FIGS. 3A and 4A described above.
  • the image correction unit 23 of the present embodiment divides the region of the image 121 into two in the vertical direction (divided into two equal parts) by the center line L1 in the vertical direction of the image 121.
  • the region above (one side) the center line L1 is the first region 1211, and the region below (the other side) the center line L1 is the second region 1212.
  • the center line L1 is set so as to intersect with the center axis P2 (see FIG. 2) of the image pickup device 211 of the image pickup unit 21.
  • the image correction unit 23 selects the first distortion correction pattern from the first distortion correction pattern, the second distortion correction pattern, and the third distortion correction pattern recorded in advance in the storage unit 26. Then, distortion correction is performed on the first region 1211. That is, the image correction unit 23 performs first distortion correction on the first region 1211 to correct distortion in the horizontal direction (the left-right direction of the image 121). Thereby, in the first region 1211, the distortion of the visitor 100B located on the left side of the image 121 is reduced, and the distortion of the left or right boundary line 202 of each of the two doors 200A and 200B is reduced ( (See FIG. 5B). On the other hand, distortion remains in the upper boundary line 201 of the two doors 200A and 200B.
  • the image correction unit 23 selects the second distortion correction pattern for the second region 1212. That is, the image correction unit 23 performs second distortion correction on the second region 1212 to correct distortion in the horizontal direction and the vertical direction (up and down direction of the image 121). As a result, in the second region 1212, the distortion of the visitor 100B is reduced, and the distortion of the left or right boundary line 202 of each of the two doors 200A, 200B is reduced. Further, the second region 1212 also eliminates the reflection of the housing 20 by correcting the vertical distortion (see FIG. 5B).
  • the region of the image 121 is divided into the first region 1211 and the second region 1212, the first distortion correction is performed on the first region 1211, and the second distortion correction is performed on the second region 1212.
  • the first distortion correction is performed on the first region 1211
  • the second distortion correction is performed on the second region 1212.
  • the image correction unit 23 divides the area of the image 121 into two areas (the first area 1211 and the second area 1212), but the number of divisions of the image 121 is not limited to two.
  • the interphone slave unit 2 according to the present embodiment is attached to be inclined with respect to a horizontal plane parallel to the ground. Therefore, depending on the inclination angle ⁇ 2 of the attachment surface 31, the visitors 100A and 100B in the image 121 and The position of the automatic door 200 changes. Therefore, it is preferable that the image correction unit 23 is configured to change the number of divisions of the image 121 according to the inclination angle ⁇ ⁇ b> 2 of the attachment surface 31.
  • the inclination angle ⁇ 2 of the attachment surface 31 can be input via the operation unit 25 described above.
  • Modification 1 of the present embodiment will be specifically described with reference to FIGS. 6A to 6C.
  • the image correction unit 23 includes a plurality of (four in the illustrated example) regions (first region 1211, second region 1212, third region 1213, and first region) according to the inclination angle ⁇ 2 of the mounting surface 31. 4 regions 1214), and different distortion correction is performed on each of the plurality of regions.
  • PL1, PL2, and PL3 are dividing lines.
  • the image correction unit 23 converts the image 121 into the first region 1211, the second region 1212, and the second region by two dividing lines PL1 and PL2, as shown in FIG. 6B.
  • the area is divided into three areas 1213.
  • the image correction unit 23 corrects the distortion in the horizontal direction (the left-right direction of the image 121) for the first region 1211 that is assumed to include the face of the visitor 100. I do.
  • the image correction unit 23 corrects the distortion in the horizontal direction and the vertical direction (the vertical direction of the image 121) for the second area 1212 between the first area 1211 and the third area 1213. Correction (two-dimensional distortion correction) is performed.
  • the image correction unit 23 performs third distortion correction for correcting the distortion in the horizontal direction and the vertical direction for the third region 1213 in which the housing 20 of the intercom slave device 2 is reflected. At this time, the image correction unit 23 preferably increases the correction strength in the vertical direction compared to the second distortion correction so that the housing 20 does not appear in the third region 1213 in the third distortion correction.
  • the image correction unit 23 divides the image 121 into a first area 1211 and a second area 1212 by one dividing line PL1, as shown in FIG. 6C. To do. In this case, the image correction unit 23 performs the first distortion correction for correcting the distortion in the horizontal direction for the first region 1211 that is assumed to include the face of the visitor 100. In addition, the image correction unit 23 performs second distortion correction for correcting distortion in the horizontal direction and the vertical direction for the second region 1212 in which the housing 20 of the intercom slave device 2 is reflected.
  • the image correction unit 23 corrects the vertical direction as compared with the case where the inclination angle ⁇ 2 of the attachment surface 31 is 30 degrees. It is preferable to reduce the strength.
  • the distortion correction according to the inclination angle ⁇ 2 of the attachment surface 31 can be performed by changing the number of divisions of the image 121 (the number of divisions of the plurality of regions) according to the inclination angle ⁇ 2 of the attachment surface 31. it can.
  • the number of divisions of the image 121 is changed in accordance with the inclination angle ⁇ 2 of the mounting surface 31 to which the interphone slave unit 2 is attached.
  • the number of divisions of the image 121 may be changed.
  • Modification 2 of the present embodiment will be specifically described with reference to FIGS. 6B, 6 ⁇ / b> C, and 7.
  • FIG. 7 is a schematic diagram illustrating an installation example of the intercom slave device 2 according to the second modification of the present embodiment.
  • the intercom handset 2 is configured such that the lens 212 can be tilted with respect to the image sensor 211.
  • the optical axis P1 of the imaging unit 21 is P11.
  • the optical axis P1 of the imaging unit 21 is P12.
  • the optical axis P1 of the imaging unit 21 is P13.
  • the image correction unit 23 divides the image 121 into the first region 1211 and the second region 1212 by one dividing line PL1, as shown in FIG. 6C. In this case, the image correction unit 23 performs the first distortion correction for correcting the distortion in the horizontal direction for the first region 1211 that is assumed to include the face of the visitor 100. In addition, the image correction unit 23 performs second distortion correction for correcting distortion in the horizontal direction and the vertical direction for the second region 1212 in which the housing 20 of the intercom slave device 2 is reflected.
  • the image correction unit 23 uses the first dividing area PL1 and the second dividing line PL2, and the second area 1212. And it divides into the 3rd field 1213. In this case, the image correction unit 23 performs the first distortion correction for correcting the distortion in the horizontal direction for the first region 1211 that is assumed to include the face of the visitor 100. In addition, the image correction unit 23 performs second distortion correction (two-dimensional distortion correction) on the second area 1212 between the first area 1211 and the third area 1213 to correct horizontal and vertical distortion. )I do.
  • the image correction unit 23 performs third distortion correction for correcting the distortion in the horizontal direction and the vertical direction for the third region 1213 in which the housing 20 of the intercom slave device 2 is reflected. At this time, the image correction unit 23 preferably increases the correction strength in the vertical direction compared to the second distortion correction so that the housing 20 does not appear in the third region 1213 in the third distortion correction.
  • the distortion correction corresponding to the inclination angle ⁇ 1 of the lens 212 is performed by changing the number of divisions of the image 121 (the number of divisions of the plurality of regions) according to the inclination angle ⁇ 1 of the lens 212 with respect to the imaging element 211. be able to.
  • the function of the image correction unit 23 can be realized by a program. That is, the program according to the present embodiment is a program for causing a computer to function as the image correction unit 23 in the intercom system 10. According to this program, by causing the computer to function as the image correction unit 23, it is possible to reduce image distortion of the image 121 and to reduce visual discomfort.
  • the interphone slave unit 2 is a lobby intercom
  • the interphone slave unit 2 is, for example, a door phone slave unit or the like installed in each dwelling unit of a housing complex.
  • the intercom base unit 1 is not limited to the indoor base unit installed in the dwelling unit of the apartment house, and may be a management room base unit installed in a manager room of the apartment house, for example.
  • the application target of the interphone system 10 is not limited to an apartment house, and may be a detached house.
  • the interphone master device 1 is an indoor master device installed in a house
  • the interphone slave device 2 is a door phone slave device installed at an outer entrance of the house.
  • the application target of the intercom system 10 is not limited to a house, and may be a non-house such as a building or a factory.
  • the entire image 121 is the target of distortion correction, but the target of distortion correction may be a part of the image 121.
  • the image correction unit 23 may be configured to divide a part of the image 121 that is a distortion correction target into a plurality of areas and perform different distortion corrections on each of the plurality of areas. .
  • the image 121 when the image 121 is divided into two equal parts by the center line L1, it may be divided into two parts by a dividing line different from the center line L1. That is, the first area, which is an area above the dividing line, and the second area, which is an area below the dividing line, may have different sizes. The same applies to the case where the image 121 is divided into three or more, and each region may be divided equally or may not be divided equally.
  • the region above the center line L1 in the image 121 is the first region 1211 and the region below the second region 1212 is the first region 1211.
  • the second region 1212 may be reversed.
  • the area above the center line L1 in the image 121 may be the second area 1212
  • the area below the first line 1211 may be the first area 1211.
  • the construction worker inputs the inclination angle ⁇ 2 of the mounting surface 31 and the inclination angle ⁇ 1 of the lens 212 at the time of construction.
  • the tilt angle ⁇ 1 of the lens 212 may be automatically input by the function of tilting the lens 212 automatically.
  • the inclination angle ⁇ 2 of the attachment surface 31 may be automatically measured.
  • the interphone system 10 including the interphone master unit 1 and the interphone slave unit 2 has been described as an example. However, the above configuration is applied to a security camera or an in-vehicle camera, for example. Also good.
  • the interphone slave unit 2 includes the image correction unit 23 has been described as an example. However, even if the interphone master unit 1 includes the image correction unit. Good.
  • the indoor cordless handset installed in the dwelling unit together with the interphone master unit 1 may have a display unit, or a general-purpose portable information terminal (PDA: Personal Digital Assistant) such as a smartphone or a tablet terminal. You may have a display part.
  • PDA Personal Digital Assistant
  • the lens 212 is configured to be tiltable with respect to the image sensor 211
  • the image sensor 211 and the lens 212 can be rotated together. It may be configured.
  • the image correction unit 23 is configured to change the number of divisions of the plurality of regions in accordance with the inclination angles of the imaging element 211 and the lens 212 in the distortion correction processing.
  • the image correction unit 23 performs distortion correction performed on each of the plurality of regions in the distortion correction processing in accordance with the first distortion correction, the second distortion correction, and the first distortion correction according to the inclination angles of the imaging element 211 and the lens 212.
  • the first distortion correction is correction for correcting distortion in the horizontal direction of the image.
  • the second distortion correction is correction for correcting distortion in the horizontal direction and vertical direction of the image.
  • the third distortion correction is correction for correcting distortion in the horizontal direction and the vertical direction of the image with a correction intensity different from that of the second distortion correction.
  • the interphone system (10) of the first aspect is an interphone system in which the interphone master unit (1) and the interphone slave unit (2) are configured to be able to communicate with each other.
  • the intercom system (10) includes an image correction unit (23) that performs distortion correction processing for correcting distortion of an image captured by the imaging unit (21) of the interphone slave unit (2).
  • the image correction unit (23) is configured to divide a region for distortion correction in an image into a plurality of regions and perform different distortion correction on each of the plurality of regions in the distortion correction processing. .
  • the image correction unit (23) divides the region to be subjected to distortion correction into a plurality of regions and performs different distortion correction on each of the plurality of regions, so that the entire image is corrected. Image distortion can be reduced and visual discomfort can be reduced as compared to the case where the same distortion correction is performed.
  • the intercom system (10) is the display unit (10) that displays an image based on the image signal of the corrected image obtained by the image correction unit (23) or the image after correction in the first aspect. 12).
  • the image corrected by the image correction unit (23) can be displayed on the display unit (12).
  • the image correction unit (23) divides the plurality of areas into a first area (1211) and a second area (1212). It is configured as follows.
  • the first area (1211) is composed of one area obtained by dividing the image (121) into two in the vertical direction.
  • the second area (1212) is composed of the other area obtained by dividing the image (121) into two in the vertical direction.
  • this configuration is not an essential configuration of the intercom system (10), and may be divided into three or more regions as a plurality of regions, for example.
  • the first area (1211) and the second area (1212) are equal to each other by the center line (L1) in the vertical direction of the image (121). It is two divided areas.
  • the area is equally divided into two areas by the center line (L1)
  • the face of the visitor may be included in one area. It can. Further, by performing distortion correction only in the horizontal direction (left and right direction of the image (121)) for one region including the face, it is possible to reduce the unnatural deformation of the visitor's face. However, whether or not to adopt this configuration is arbitrary.
  • the image correction unit (23) performs the first distortion correction on the first region (1211) in the distortion correction processing, and the second distortion The correction is performed on the second region (1212).
  • the first distortion correction the distortion in the horizontal direction of the image (121) is corrected.
  • the second distortion correction distortion in the horizontal direction and vertical direction of the image (121) is corrected.
  • the reflection of the housing (20) can be reduced compared to the case where the first distortion correction is performed on the entire image, and the person is compared with the case where the second distortion correction is performed on the entire image. It is possible to reduce the unnatural deformation of the (visitor) face. That is, according to the fourth aspect, it is possible to reduce image distortion and to reduce visual discomfort compared to a case where the same distortion correction is performed on the entire image. However, whether or not to adopt this configuration is arbitrary.
  • the imaging unit (21) further includes a lens (212) that can be tilted with respect to the imaging element (211).
  • the image correction unit (23) is configured to change the number of divisions of the plurality of regions in accordance with the inclination angle ( ⁇ 1) of the lens (212) in the distortion correction processing.
  • this configuration is not an essential configuration of the intercom system (10).
  • the number of divisions of the plurality of regions may be constant regardless of the inclination angle ( ⁇ 1) of the lens (212).
  • the image correction unit (23) performs distortion correction performed on each of the plurality of regions in the distortion correction processing, by tilting the lens (212). Depending on the angle ( ⁇ 1), the first distortion correction, the second distortion correction, and the third distortion correction are selected.
  • the first distortion correction the distortion in the horizontal direction of the image (121) is corrected.
  • the second distortion correction distortion in the horizontal direction and vertical direction of the image (121) is corrected.
  • the third distortion correction distortion in the horizontal direction and the vertical direction of the image (121) is corrected with a correction intensity different from that of the second distortion correction.
  • the first distortion correction, the second distortion correction, the third distortion correction, and the distortion correction performed on each of the plurality of regions are performed according to the inclination angle ( ⁇ 1) of the lens (212). You can choose from. However, whether or not to adopt this configuration is arbitrary.
  • the interphone slave unit (2) includes a housing (1) that houses the imaging unit (21) and the transmission unit (221). 20).
  • the housing (20) has a mounting surface (31) of the mounting base (3) whose mounting surface (31) is inclined, and the central axis (P2) of the image sensor (211) is a normal line of the mounting surface (31). It is attached so as to be parallel to the direction.
  • the image correction unit (23) is configured to change the number of divisions of the plurality of regions in accordance with the inclination angle ( ⁇ 2) of the attachment surface (31) in the distortion correction processing.
  • the distortion correction process according to the inclination angle ((theta) 2) of a mounting surface (31) can be performed.
  • this configuration is not an essential configuration of the intercom system (10).
  • the number of divisions of the plurality of regions may be constant regardless of the inclination angle ( ⁇ 2) of the attachment surface (31).
  • the image correction unit (23) performs distortion correction on each of the plurality of regions in the distortion correction processing of the attachment surface (31). According to the inclination angle ( ⁇ 2), the first distortion correction, the second distortion correction, and the third distortion correction are selected.
  • the first distortion correction the distortion in the horizontal direction of the image (121) is corrected.
  • the second distortion correction distortion in the horizontal direction and vertical direction of the image (121) is corrected.
  • the third distortion correction distortion in the horizontal direction and the vertical direction of the image (121) is corrected with a correction intensity different from that of the second distortion correction.
  • the first distortion correction, the second distortion correction, and the third distortion correction are performed on each of the plurality of regions according to the inclination angle ( ⁇ 2) of the attachment surface (31). You can choose between distortion correction. However, whether or not to adopt this configuration is arbitrary.
  • the interphone base unit (1) according to the tenth aspect is used for the interphone system (10) according to any one of the first to ninth aspects.
  • the interphone base unit (1) by using the interphone base unit (1), it is possible to provide the interphone system (10) that can reduce image distortion and reduce visual discomfort.
  • the eleventh aspect of the interphone slave unit (2) is used in the intercom system (10) of any one of the first to ninth aspects.
  • the interphone slave unit (2) by using the interphone slave unit (2), it is possible to provide the interphone system (10) that can reduce image distortion and reduce visual discomfort.
  • the program of the twelfth aspect causes the computer to function as the image correction unit (23) in the intercom system (10) of any one of the first to ninth aspects.
  • the computer by causing the computer to function as the image correction unit (23), it is possible to reduce image distortion and to reduce visual discomfort.

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  • Engineering & Computer Science (AREA)
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  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Studio Devices (AREA)

Abstract

The purpose of the present invention is to reduce image distortion and also reduce visual discomfort. An interphone system (10) according to the present invention is provided with an image correction unit (23) which corrects distortion of an image captured by an image-capturing unit (21) of an interphone sub-device (2). The image correction unit (23), when correcting distortion, divides a region of an image, in which distortion is to be corrected, into a plurality of regions, and performs a different distortion correction for each of the plurality of regions.

Description

インターホンシステム、インターホン親機、インターホン子機、及びプログラムInterphone system, interphone master unit, interphone slave unit, and program
　本発明は、インターホンシステム、インターホン親機、インターホン子機、及びプログラムに関し、より詳細には、撮像機能を備えたインターホンシステム、インターホン親機、インターホン子機、及びプログラムに関する。 The present invention relates to an interphone system, an interphone master device, an interphone slave device, and a program, and more particularly, to an interphone system, an interphone master device, an interphone slave device, and a program having an imaging function.
　従来、カメラの視野範囲を広くするために広角レンズを用いたインターホンシステム（テレビインターホン）が提供されている（例えば特許文献１参照）。特許文献１に記載のインターホンシステムは、インターホン子機（子器）と、信号伝送系を介してインターホン子機に接続されるインターホン親機（親器）とを備える。インターホン子機は、広角レンズを装着した撮像部（テレビカメラ）と、来客の音声を集音するマイクロホンとを有する。インターホン親機は、インターホン子機からの画像を表示する表示部（モニターテレビ）と、インターホン子機からの音声を出力するスピーカと、画像歪みを補正する画像補正部（画像歪み補正手段）とを有する。 Conventionally, an interphone system (TV interphone) using a wide-angle lens has been provided to widen the field of view of a camera (see, for example, Patent Document 1). The intercom system described in Patent Literature 1 includes an interphone slave unit (slave unit) and an interphone master unit (parent unit) connected to the interphone slave unit via a signal transmission system. The intercom handset has an image pickup unit (television camera) equipped with a wide-angle lens and a microphone that collects the voice of a visitor. The interphone master unit includes a display unit (monitor TV) that displays an image from the interphone slave unit, a speaker that outputs sound from the interphone slave unit, and an image correction unit (image distortion correction unit) that corrects image distortion. Have.
　特許文献１に記載のインターホンシステムでは、広角レンズを用いることによって生じる画像歪みを画像補正部により補正し、補正後の映像を表示部に映し出すことにより、歪みの少ない映像を得ることができる。 In the intercom system described in Patent Document 1, an image with less distortion can be obtained by correcting image distortion caused by using a wide-angle lens by an image correcting unit and projecting the corrected image on a display unit.
　ところで、特許文献１に記載のインターホンシステムでは、インターホン子機からの映像全体に対して同じ歪み補正を行うように構成されており、そのため視覚的に違和感を生じる映像が表示部に映し出される可能性があった。 By the way, in the intercom system described in Patent Document 1, it is configured to perform the same distortion correction on the entire video from the interphone slave unit. Therefore, there is a possibility that a video that causes a visually strange feeling is projected on the display unit. was there.
特開平６－２２５３１２号公報JP-A-6-225312
　本発明は上記課題に鑑みてなされており、画像歪みを低減し、かつ視覚的な違和感を低減することができるインターホンシステム、インターホン親機、インターホン子機、及びプログラムを提供することを目的とする。 The present invention has been made in view of the above problems, and an object thereof is to provide an interphone system, an interphone master unit, an interphone slave unit, and a program that can reduce image distortion and reduce visual discomfort. .
　本発明の一態様に係るインターホンシステムは、インターホン親機及びインターホン子機が互いに通信可能に構成されたインターホンシステムである。前記インターホンシステムは、前記インターホン子機の撮像部で撮像した画像の歪みを補正する歪み補正処理を行う画像補正部を備える。前記画像補正部は、前記歪み補正処理において、前記画像における歪み補正の対象となる領域を複数の領域に分割し、前記複数の領域の各々に対して互いに異なる歪み補正を行うように構成されている。 The interphone system according to one aspect of the present invention is an interphone system in which an interphone master unit and an interphone slave unit are configured to be able to communicate with each other. The intercom system includes an image correction unit that performs a distortion correction process for correcting distortion of an image captured by the imaging unit of the interphone slave unit. The image correction unit is configured to divide a region to be subjected to distortion correction in the image into a plurality of regions in the distortion correction processing, and perform different distortion correction on each of the plurality of regions. Yes.
　本発明の一態様に係るインターホン親機は、上述のインターホンシステムに用いられる。 The interphone master according to one aspect of the present invention is used in the above-described interphone system.
　本発明の一態様に係るインターホン子機は、上述のインターホンシステムに用いられる。 The intercom handset according to one aspect of the present invention is used in the above-described intercom system.
　本発明の一態様に係るプログラムは、コンピュータを、上述のインターホンシステムにおける前記画像処理部として機能させる。 The program according to an aspect of the present invention causes a computer to function as the image processing unit in the above intercom system.
図１は、本発明の一実施形態に係るインターホンシステムのブロック図である。FIG. 1 is a block diagram of an intercom system according to an embodiment of the present invention. 図２は、本発明の一実施形態に係るインターホン子機の設置例を示す概略図である。FIG. 2 is a schematic diagram showing an installation example of the interphone slave unit according to the embodiment of the present invention. 図３Ａは、比較例１に係るインターホン親機の表示部に表示される歪み補正前の画像の概略図である。図３Ｂは、同上のインターホン親機の表示部に表示される歪み補正後の画像の概略図である。FIG. 3A is a schematic diagram of an image before distortion correction displayed on the display unit of the intercom master according to Comparative Example 1. FIG. 3B is a schematic diagram of an image after distortion correction that is displayed on the display unit of the interphone master unit. 図４Ａは、比較例２に係るインターホン親機の表示部に表示される歪み補正前の画像の概略図である。図４Ｂは、同上のインターホン親機の表示部に表示される歪み補正後の画像の概略図である。4A is a schematic diagram of an image before distortion correction displayed on the display unit of the intercom master according to Comparative Example 2. FIG. FIG. 4B is a schematic diagram of an image after distortion correction displayed on the display unit of the interphone master unit. 図５Ａは、本発明の一実施形態に係るインターホン親機の表示部に表示される歪み補正前の画像の概略図である。図５Ｂは、同上のインターホン親機の表示部に表示される歪み補正後の画像の概略図である。FIG. 5A is a schematic view of an image before distortion correction displayed on the display unit of the intercom master according to the embodiment of the present invention. FIG. 5B is a schematic diagram of an image after distortion correction that is displayed on the display unit of the interphone master unit. 図６Ａ～図６Ｃは、本発明の一実施形態の変形例１に係るインターホン親機の表示部に表示される画像の分割例を示す概略図である。6A to 6C are schematic diagrams illustrating an example of division of an image displayed on the display unit of the intercom master according to Modification 1 of the embodiment of the present invention. 図７は、本発明の一実施形態の変形例２に係るインターホン子機の設置例を示す概略図である。FIG. 7 is a schematic diagram illustrating an installation example of the intercom slave device according to the second modification of the embodiment of the present invention.
　以下、本発明の一実施形態について説明する。下記の実施形態は、本発明の様々な実施形態の一つに過ぎない。また、下記の実施形態は、本発明の目的を達成できれば、設計等に応じて種々の変更が可能である。 Hereinafter, an embodiment of the present invention will be described. The following embodiment is only one of various embodiments of the present invention. Further, the following embodiments can be variously changed according to the design or the like as long as the object of the present invention can be achieved.
　本実施形態のインターホンシステム１０は、図１に示すように、インターホン親機１と、インターホン子機２とを備えている。本実施形態では、インターホンシステム１０が、集合住宅用のインターホンシステムである場合を例として説明する。なお、以下の説明において来訪者１００Ａ，１００Ｂをとくに区別しない場合には、来訪者１００Ａ，１００Ｂの各々を「来訪者１００」という。 The interphone system 10 of the present embodiment includes an interphone master unit 1 and an interphone slave unit 2 as shown in FIG. This embodiment demonstrates as an example the case where the intercom system 10 is an intercom system for apartment houses. In the following description, when the visitors 100A and 100B are not particularly distinguished, each of the visitors 100A and 100B is referred to as “visitor 100”.
　インターホン親機１は、集合住宅の住戸内（室内）に設置される室内親機である。インターホン子機２は、集合住宅の共用スペース（ロビー）に設置されるロビーインターホンである。インターホン親機１とインターホン子機２とは互いに通信可能に構成されている。これにより、インターホンシステム１０では、インターホン親機１とインターホン子機２との間で通話可能となる。また、インターホン子機２には撮像部２１が設けられ、インターホン親機１には表示部１２が設けられている。これにより、インターホンシステム１０では、インターホン子機２の撮像部２１で撮像された来訪者等の画像をインターホン親機１の表示部１２に表示することができる。 The intercom base unit 1 is an indoor base unit installed in a dwelling unit (indoor) of an apartment house. The intercom handset 2 is a lobby intercom installed in a common space (lobby) of an apartment house. The interphone master unit 1 and the interphone slave unit 2 are configured to be able to communicate with each other. Thereby, in the intercom system 10, a call can be made between the interphone master unit 1 and the interphone slave unit 2. The intercom handset 2 is provided with an imaging unit 21, and the intercom base unit 1 is provided with a display unit 12. Thereby, in the intercom system 10, an image of a visitor or the like captured by the image capturing unit 21 of the interphone slave unit 2 can be displayed on the display unit 12 of the interphone master unit 1.
　インターホン子機２は、図１に示すように、撮像部２１と、子機通信部２２と、画像補正部２３と、子機制御部２４と、操作部２５と、記憶部２６とを有している。 As shown in FIG. 1, the interphone slave unit 2 includes an imaging unit 21, a slave unit communication unit 22, an image correction unit 23, a slave unit control unit 24, an operation unit 25, and a storage unit 26. ing.
　撮像部２１は、特定領域を撮像する撮像素子２１１と、撮像素子２１１に対して傾斜可能なレンズ２１２とを含んでいる。撮像部２１は、来訪者等の被写体を撮像するためのカメラである。そのため、来訪者がインターホン子機２を操作する際に少なくとも来訪者の顔が画像に写り込むように、撮像部２１の撮像エリア（視野）はインターホン子機２の前方に設定される。本実施形態では、撮像部２１は動画を撮像するカメラであると仮定するが、撮像部２１は静止画を撮像するカメラ（スチルカメラ）であってもよい。また、本実施形態では、撮像部２１はカラー画像を撮像するカラーカメラであると仮定するが、撮像部２１はモノクローム画像を撮像するモノクロームカメラであってもよい。ここに、本実施形態では、集合住宅の共用スペースが特定領域である。もちろん、特定領域は集合住宅の共用スペースに限らず、例えばインターホン子機２が集合住宅の各住戸の外玄関に設置されている場合には、各住戸の玄関先が特定領域となる。 The imaging unit 21 includes an imaging element 211 that images a specific area, and a lens 212 that can be tilted with respect to the imaging element 211. The imaging unit 21 is a camera for imaging a subject such as a visitor. Therefore, the imaging area (field of view) of the imaging unit 21 is set in front of the interphone slave unit 2 so that at least the face of the visitor is reflected in the image when the visitor operates the interphone slave unit 2. In the present embodiment, it is assumed that the imaging unit 21 is a camera that captures a moving image, but the imaging unit 21 may be a camera (still camera) that captures a still image. In the present embodiment, it is assumed that the imaging unit 21 is a color camera that captures a color image, but the imaging unit 21 may be a monochrome camera that captures a monochrome image. Here, in this embodiment, the common space of the apartment house is a specific area. Of course, the specific area is not limited to the common space of the apartment house. For example, when the interphone handset 2 is installed at the outer entrance of each dwelling unit of the apartment house, the entrance of each dwelling unit is the specific area.
　撮像素子２１１は、例えばＣＣＤ（Charge Coupled Devices）イメージセンサ、又はＣＭＯＳ（Complementary Metal-Oxide Semiconductor）イメージセンサ等の二次元イメージセンサである。撮像部２１は、被写体からの光をレンズ２１２によって撮像素子２１１の撮像面（受光面）上に結像させ、撮像素子２１１にて被写体からの光を電気信号（画像信号）に変換する。そのため、撮像部２１で撮像された画像は、撮像部２１から画像信号として出力される。ここでは、撮像部２１は、撮像素子２１１の出力信号からＹＵＶフォーマットのデジタルの画像信号を生成し、デジタルの画像信号を出力するように構成されている。レンズ２１２は、例えば１８０度以上の画角を有する魚眼レンズ（超広角レンズ）であり、左右方向（図２の紙面に垂直な方向）と直交する平面において撮像素子２１１に対して回転可能（傾斜可能）に構成されている。したがって、撮像素子２１１とレンズ２１２とを含む撮像部２１の光軸Ｐ１（図２参照）は、レンズ２１２の傾斜角度α１（図７参照）に応じて変化することになる。 The imaging element 211 is a two-dimensional image sensor such as a CCD (Charge Coupled Devices) image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) image sensor. The imaging unit 21 forms an image of light from the subject on the imaging surface (light receiving surface) of the imaging device 211 by the lens 212, and converts the light from the subject into an electrical signal (image signal) by the imaging device 211. Therefore, the image captured by the imaging unit 21 is output from the imaging unit 21 as an image signal. Here, the imaging unit 21 is configured to generate a digital image signal in YUV format from the output signal of the imaging element 211 and output the digital image signal. The lens 212 is a fish-eye lens (super wide angle lens) having an angle of view of, for example, 180 degrees or more, and is rotatable (tiltable) with respect to the image sensor 211 in a plane orthogonal to the left-right direction (direction perpendicular to the paper surface of FIG. ). Therefore, the optical axis P1 (see FIG. 2) of the imaging unit 21 including the imaging element 211 and the lens 212 changes according to the tilt angle α1 (see FIG. 7) of the lens 212.
　子機通信部２２は、インターホン親機１と通信するための通信インターフェースである。子機通信部２２は、例えばツイストペア線等からなる２線式の伝送路４（図１では１本の線で示す）を介して、インターホン親機１と電気的に接続されている。子機通信部２２は、送信部２２１を含んでいる。送信部２２１は、撮像部２１で撮像された画像の画像信号をインターホン親機１に送信する。さらに、インターホン子機２とインターホン親機１との間で音声信号及び制御信号が双方向に伝送可能となるよう、子機通信部２２は、インターホン親機１との間で双方向に通信可能に構成されている。 The slave unit communication unit 22 is a communication interface for communicating with the interphone master unit 1. The slave unit communication unit 22 is electrically connected to the interphone master unit 1 via a two-wire transmission path 4 (indicated by one line in FIG. 1) made of, for example, a twisted pair line. The subunit | mobile_unit communication part 22 contains the transmission part 221. FIG. The transmission unit 221 transmits the image signal of the image captured by the imaging unit 21 to the intercom base unit 1. Further, the slave unit communication unit 22 can communicate bidirectionally with the interphone master unit 1 so that audio signals and control signals can be transmitted bidirectionally between the interphone slave unit 2 and the interphone master unit 1. It is configured.
　画像補正部２３は、撮像部２１から出力される画像信号に対して、画像の歪みを補正する歪み補正処理を行うように構成されている。子機通信部２２には、画像補正部２３から出力される画像（画像信号）が入力される。そのため、送信部２２１は、撮像部２１から出力された状態の画像信号ではなく、画像補正部２３で補正された画像信号をインターホン親機１に送信することになる。画像補正部２３は、例えばＤＳＰ（Digital Signal Processor）又はＦＰＧＡ（Field-Programmable Gate Array）等で実現される。なお、画像補正部２３の歪み補正処理については後述する。 The image correction unit 23 is configured to perform distortion correction processing for correcting image distortion on the image signal output from the imaging unit 21. The slave unit communication unit 22 receives an image (image signal) output from the image correction unit 23. Therefore, the transmission unit 221 transmits the image signal corrected by the image correction unit 23 to the intercom base unit 1 instead of the image signal output from the imaging unit 21. The image correction unit 23 is realized by, for example, a DSP (Digital Signal Processor) or an FPGA (Field-Programmable Gate Array). The distortion correction processing of the image correction unit 23 will be described later.
　操作部２５は、来訪者から呼び出しのための操作を受け付ける。操作部２５に対して所定の操作（例えば押操作）がされると、インターホン子機２は、住居内の居住者を呼び出すための制御信号（呼出信号）を子機通信部２２からインターホン親機１へ送信する。また、操作部２５は、撮像素子２１１に対するレンズ２１２の傾斜角度α１、及びインターホン子機２が取り付けられる取付台３（図２参照）の取付面３１の傾斜角度θ２を入力可能に構成されている。これらの傾斜角度α１、θ２は、インターホンシステム１０の施工時において施工者によって入力される。 The operation unit 25 receives an operation for calling from a visitor. When a predetermined operation (for example, a push operation) is performed on the operation unit 25, the interphone handset 2 sends a control signal (call signal) for calling a resident in the residence from the handset communication unit 22 to the interphone base unit. Send to 1. The operation unit 25 is configured to be able to input an inclination angle α1 of the lens 212 with respect to the image sensor 211 and an inclination angle θ2 of the mounting surface 31 of the mounting base 3 (see FIG. 2) to which the interphone slave unit 2 is mounted. . These inclination angles α1 and θ2 are input by the installer when the interphone system 10 is installed.
　記憶部２６は、データを書き換え可能なメモリであって、不揮発性メモリであることが好ましい。記憶部２６は、撮像部２１で撮像された画像を記録するように構成されている。また、記憶部２６には、撮像部２１で撮像された画像に対して行われる複数の歪み補正パターンが予め記録されている。本実施形態では、複数の歪み補正パターンとして、第１歪み補正パターン、第２歪み補正パターン及び第３歪み補正パターンが予め記憶部２６に記録されている。第１歪み補正パターンでは、画像の左右方向（水平方向）に歪み補正を行う。第２歪み補正パターンでは、画像の左右方向及び上下方向（鉛直方向）に歪み補正を行う。第３歪み補正パターンでは、第２歪み補正パターンとは異なる補正強度で画像の左右方向及び上下方向に歪み補正を行う。ここに、補正強度とは、水平方向及び鉛直方向のうちの少なくとも一方向における引き延ばし度合いのことをいう。例えば、水平方向の補正強度が強い場合には、水平方向に大きく引き延ばされることになる。 The storage unit 26 is a rewritable memory and is preferably a non-volatile memory. The storage unit 26 is configured to record an image captured by the imaging unit 21. In addition, a plurality of distortion correction patterns that are performed on the image captured by the imaging unit 21 are recorded in the storage unit 26 in advance. In the present embodiment, a first distortion correction pattern, a second distortion correction pattern, and a third distortion correction pattern are recorded in advance in the storage unit 26 as a plurality of distortion correction patterns. In the first distortion correction pattern, distortion correction is performed in the left-right direction (horizontal direction) of the image. In the second distortion correction pattern, distortion correction is performed in the horizontal direction and vertical direction (vertical direction) of the image. In the third distortion correction pattern, distortion correction is performed in the horizontal direction and the vertical direction of the image with a correction intensity different from that of the second distortion correction pattern. Here, the correction strength refers to the degree of stretching in at least one of the horizontal direction and the vertical direction. For example, when the correction strength in the horizontal direction is strong, the correction is greatly extended in the horizontal direction.
　子機制御部２４は、インターホン子機２の各構成要素を制御する。子機制御部２４は、例えばＣＰＵ（Central Processing Unit）及びメモリを主構成とするマイクロコンピュータで構成されており、ＣＰＵがメモリに格納されているプログラムを実行することにより、マイクロコンピュータが子機制御部２４として機能する。ＣＰＵが実行するプログラムは、ここではマイクロコンピュータのメモリに予め記録されているが、メモリカード等の非一時的な記録媒体に記録されて提供されてもよいし、電気通信回線を通じて提供されてもよい。 The slave unit control unit 24 controls each component of the intercom slave unit 2. The slave unit control unit 24 is composed of, for example, a microcomputer having a CPU (Central Processing Unit) and a memory as main components, and the microcomputer executes a program stored in the memory so that the microcomputer can control the slave unit. It functions as the unit 24. Here, the program executed by the CPU is recorded in advance in the memory of the microcomputer, but may be provided by being recorded on a non-temporary recording medium such as a memory card or provided through an electric communication line. Good.
　インターホン子機２は、図２に示すように、筐体２０を更に有している。筐体２０は、厚みの薄い矩形箱状に形成されており、筐体２０の内部には、撮像部２１及び送信部２２１を含むインターホン子機２の各構成要素が収納されている。 The intercom handset 2 further includes a housing 20 as shown in FIG. The casing 20 is formed in a rectangular box shape with a small thickness, and each component of the intercom slave device 2 including the imaging unit 21 and the transmission unit 221 is accommodated in the casing 20.
　インターホン親機１は、図１に示すように、親機通信部１１と、表示部１２と、親機制御部１３と、画像処理部１４と、操作部１５とを有している。 As shown in FIG. 1, the intercom base unit 1 includes a base unit communication unit 11, a display unit 12, a base unit control unit 13, an image processing unit 14, and an operation unit 15.
　親機通信部１１は、インターホン子機２と通信するための通信インターフェースである。親機通信部１１は、伝送路４を介して、インターホン子機２の子機通信部２２と電気的に接続されている。親機通信部１１は、受信部１１１を含んでいる。受信部１１１は、インターホン子機２の送信部２２１から送信された画像信号を受信する。さらに、インターホン親機１との間で音声信号及び制御信号が双方向に伝送可能となるよう、親機通信部１１は、インターホン子機２（子機通信部２２）との間で双方向に通信可能に構成されている。 The base unit communication unit 11 is a communication interface for communicating with the interphone handset 2. The base unit communication unit 11 is electrically connected to the handset communication unit 22 of the interphone handset 2 via the transmission path 4. Base unit communication unit 11 includes a reception unit 111. The reception unit 111 receives the image signal transmitted from the transmission unit 221 of the intercom slave device 2. Furthermore, the base unit communication unit 11 is bidirectional with the interphone slave unit 2 (slave unit communication unit 22) so that audio signals and control signals can be transmitted bidirectionally with the interphone base unit 1. It is configured to be able to communicate.
　表示部１２は、画像信号に基づいて画像を表示する。表示部１２は、例えば液晶ディスプレイである。また、インターホン親機１がタッチパネルを備えている場合には、タッチパネルディスプレイが表示部１２と操作部１５とを兼ねることになる。 Display unit 12 displays an image based on the image signal. The display unit 12 is a liquid crystal display, for example. Further, when the intercom base unit 1 includes a touch panel, the touch panel display serves as both the display unit 12 and the operation unit 15.
　画像処理部１４は、受信部１１１から出力される画像信号を受けて、画像処理を行う。表示部１２には、画像処理部１４から出力される画像（画像信号）が入力される。そのため、表示部１２は、受信部１１１が受信した状態の画像信号に基づく画像ではなく、画像処理部１４で画像処理が施された画像信号に基づく画像を表示することになる。画像処理部１４は、例えばＤＳＰ又はＦＰＧＡ等で実現される。 The image processing unit 14 receives the image signal output from the receiving unit 111 and performs image processing. An image (image signal) output from the image processing unit 14 is input to the display unit 12. Therefore, the display unit 12 displays an image based on the image signal that has been subjected to image processing by the image processing unit 14 instead of an image based on the image signal received by the receiving unit 111. The image processing unit 14 is realized by a DSP or FPGA, for example.
　操作部１５は、住戸内の居住者の操作を受け付ける。親機通信部１１が、居住者を呼び出すための制御信号（呼出信号）をインターホン子機２から受信している状態で、操作部１５に対して所定の操作（例えば押操作）がされると、インターホン親機１とインターホン子機２との間で通話可能な状態となる。 The operation unit 15 receives an operation of a resident in the dwelling unit. When the base unit communication unit 11 receives a control signal (calling signal) for calling a resident from the intercom handset 2, a predetermined operation (for example, a push operation) is performed on the operation unit 15. The interphone master unit 1 and the interphone slave unit 2 are ready to talk.
　親機制御部１３は、インターホン親機１の各構成要素を制御する。親機制御部１３は、例えばＣＰＵ及びメモリを主構成とするマイクロコンピュータで構成されており、ＣＰＵがメモリに格納されているプログラムを実行することにより、マイクロコンピュータが親機制御部１３として機能する。ＣＰＵが実行するプログラムは、ここではマイクロコンピュータのメモリに予め記録されているが、メモリカード等の非一時的な記録媒体に記録されて提供されてもよいし、電気通信回線を通じて提供されてもよい。 The base unit control unit 13 controls each component of the intercom base unit 1. The base unit control unit 13 is composed of, for example, a microcomputer mainly composed of a CPU and a memory, and the microcomputer functions as the base unit control unit 13 when the CPU executes a program stored in the memory. . Here, the program executed by the CPU is recorded in advance in the memory of the microcomputer, but may be provided by being recorded on a non-temporary recording medium such as a memory card or provided through an electric communication line. Good.
　図２は、本実施形態のインターホン子機２の設置例を示す概略図である。集合住宅の共用スペース５には、図２に示すように、上下方向（鉛直方向）に長い直方体状に形成された取付台３が設けられている。取付台３は、インターホン子機２が取り付けられる取付面３１を有している。取付面３１は、図２に示すように、地面と平行な水平面に対して傾斜しており、その傾斜角度はθ２である。そのため、インターホン子機２を取付台３の取付面３１に取り付けた状態では、インターホン子機２（筐体２０）も、上記水平面に対して傾斜角度θ２で傾斜することになる。 FIG. 2 is a schematic diagram showing an installation example of the intercom slave device 2 of the present embodiment. As shown in FIG. 2, the common space 5 of the apartment house is provided with a mounting base 3 formed in a rectangular parallelepiped shape that is long in the vertical direction (vertical direction). The mounting base 3 has a mounting surface 31 to which the interphone slave unit 2 is mounted. As shown in FIG. 2, the attachment surface 31 is inclined with respect to a horizontal plane parallel to the ground, and the inclination angle is θ2. Therefore, in a state where the interphone slave unit 2 is attached to the attachment surface 31 of the mount 3, the interphone slave unit 2 (housing 20) is also inclined at the inclination angle θ2 with respect to the horizontal plane.
　インターホン子機２が取付台３に取り付けられた状態では、撮像素子２１１の中心軸Ｐ２は、取付面３１の法線方向と平行になっている。また、本実施形態では、撮像素子２１１とレンズ２１２とを含む撮像部２１の光軸Ｐ１の方向が水平方向となるように、左右方向（図２の紙面に垂直な方向）と直交する平面において撮像素子２１１に対してレンズ２１２を時計回りに回転させている。したがって、本実施形態では、撮像部２１の光軸Ｐ１と撮像素子２１１の中心軸Ｐ２とが一致していない。 In the state where the intercom handset 2 is attached to the mount 3, the center axis P <b> 2 of the image sensor 211 is parallel to the normal direction of the attachment surface 31. Further, in the present embodiment, in a plane orthogonal to the left-right direction (direction perpendicular to the paper surface of FIG. 2) so that the direction of the optical axis P1 of the imaging unit 21 including the imaging element 211 and the lens 212 is the horizontal direction. The lens 212 is rotated clockwise with respect to the image sensor 211. Therefore, in the present embodiment, the optical axis P1 of the imaging unit 21 and the central axis P2 of the imaging element 211 do not match.
　また、本実施形態では、レンズ２１２が魚眼レンズであることから、左右方向と直交する平面における撮像部２１の視野角はθ１となる（図２参照）。ここで、撮像部２１の光軸Ｐ１の方向が水平方向となるように、レンズ２１２を傾斜（回転）させているため、インターホン子機２の筐体２０の一部が撮像部２１の撮像エリアに含まれるように、撮像部２１の視野角θ１が設定されている。 Further, in this embodiment, since the lens 212 is a fisheye lens, the viewing angle of the imaging unit 21 in a plane orthogonal to the left-right direction is θ1 (see FIG. 2). Here, since the lens 212 is tilted (rotated) so that the direction of the optical axis P1 of the imaging unit 21 is the horizontal direction, a part of the housing 20 of the intercom slave unit 2 is in the imaging area of the imaging unit 21. The viewing angle θ1 of the imaging unit 21 is set so as to be included in FIG.
　図３Ａ及び図３Ｂは、比較例１に係るインターホン親機１の表示部１２に表示される画像１２１の概略図である。本実施形態では、上述のように、撮像部２１のレンズ２１２は魚眼レンズである。そのため、撮像部２１により撮像した画像１２１では、図３Ａに示すように、中心部が膨らむように歪む、いわゆる樽型の歪曲収差（distortion）が生じる。 3A and 3B are schematic diagrams of an image 121 displayed on the display unit 12 of the intercom master device 1 according to the comparative example 1. FIG. In the present embodiment, as described above, the lens 212 of the imaging unit 21 is a fisheye lens. Therefore, in the image 121 imaged by the imaging unit 21, so-called barrel-shaped distortion, which is distorted so that the center part swells, occurs as shown in FIG. 3A.
　来訪者１００Ａは、図３Ａに示すように、画像１２１の中央に位置しているため、歪みが少ない。一方、来訪者１００Ｂは、画像１２１の左側に位置しているため、外向き（左向き）に湾曲している。来訪者１００Ａの後方には、２枚の扉２００Ａ，２００Ｂを有する自動ドア２００が位置している。２枚の扉２００Ａ，２００Ｂの各々では、上側の境界線２０１，２０１が外向き（上向き）に湾曲している。また、一方（図３Ａにおける左側）の扉２００Ａの左側の境界線２０２、及び他方の扉２００Ｂの右側の境界線２０２についても、外向き（左向き又は右向き）に湾曲している。さらに、図３Ａに示す例では、画像１２１の下部にインターホン子機２の筐体２０の一部が写り込んでいる。 Since the visitor 100A is located at the center of the image 121 as shown in FIG. 3A, there is little distortion. On the other hand, since the visitor 100B is located on the left side of the image 121, it is curved outward (leftward). An automatic door 200 having two doors 200A and 200B is located behind the visitor 100A. In each of the two doors 200A and 200B, the upper boundary lines 201 and 201 are curved outward (upward). Further, the left boundary line 202 of the one door 200A (left side in FIG. 3A) and the right boundary line 202 of the other door 200B are also curved outward (leftward or rightward). Furthermore, in the example shown in FIG. 3A, a part of the housing 20 of the intercom slave device 2 is reflected in the lower part of the image 121.
　画像補正部２３が、画像１２１に対して水平方向（画像１２１の左右方向）のみに歪み補正を行った場合（図３Ａ中の矢印参照）、図３Ｂに示すように、画像１２１の歪みが補正される。ここで、水平方向の歪み補正とは、画像１２１内において鉛直方向（上下方向）に伸びる線の歪みが低減されるように、水平方向に引き延ばす補正のことをいう。この場合、画像１２１の左側に位置する来訪者１００Ｂの歪みが低減され、かつ２枚の扉２００Ａ，２００Ｂの各々の左側又は右側の境界線２０２の歪みが低減される。なお、この場合には、２枚の扉２００Ａ，２００Ｂの上側の境界線２０１の歪みは残ったままであり、かつ筐体２０の写り込みもそのままである。 When the image correction unit 23 performs distortion correction only in the horizontal direction (left and right direction of the image 121) with respect to the image 121 (see arrows in FIG. 3A), the distortion of the image 121 is corrected as illustrated in FIG. 3B. Is done. Here, horizontal distortion correction refers to correction that extends in the horizontal direction so that distortion of a line extending in the vertical direction (vertical direction) in the image 121 is reduced. In this case, the distortion of the visitor 100B located on the left side of the image 121 is reduced, and the distortion of the left or right boundary line 202 of each of the two doors 200A and 200B is reduced. In this case, the distortion of the boundary line 201 on the upper side of the two doors 200A and 200B remains, and the reflection of the housing 20 remains as it is.
　図４Ａ及び図４Ｂは、比較例２に係るインターホン親機１の表示部１２に表示される画像１２１の概略図である。なお、図４Ａは、上述の図３Ａと同様であり、ここでは図４Ａについては説明を省略する。 4A and 4B are schematic diagrams of an image 121 displayed on the display unit 12 of the intercom master device 1 according to the comparative example 2. FIG. 4A is the same as FIG. 3A described above, and the description of FIG. 4A is omitted here.
　画像補正部２３が、画像１２１に対して水平方向（画像１２１の左右方向）及び鉛直方向（画像１２１の上下方向）に歪み補正（２次元方向歪み補正）を行った場合（図４Ａ中の矢印参照）、図４Ｂに示すように、画像１２１の歪みが補正される。ここで、２次元方向歪み補正とは、画像１２１内において鉛直方向に伸びる線と水平方向に伸びる線との歪みが低減されるように、鉛直方向及び水平方向に引き延ばす補正のことをいう。この場合、２枚の扉２００Ａ，２００Ｂの各々における上側の境界線２０１及び左側又は右側の境界線２０２の歪みが低減され、かつインターホン子機２の筐体２０の写り込みがなくなる。ただし、この場合には、画像１２１の左側に位置する来訪者１００Ｂについて、水平方向の歪みは低減されるが、鉛直方向の歪み補正によって鉛直方向に引き延ばされてしまう。その結果、来訪者１００Ｂと来訪者１００Ｂの後方に位置する自動ドア２００との遠近感が誇張されるため、不自然な画像になる。 When the image correction unit 23 performs distortion correction (two-dimensional distortion correction) in the horizontal direction (left-right direction of the image 121) and the vertical direction (up-down direction of the image 121) with respect to the image 121 (arrow in FIG. 4A) As shown in FIG. 4B, the distortion of the image 121 is corrected. Here, the two-dimensional distortion correction refers to correction that extends in the vertical direction and the horizontal direction so that distortion between a line extending in the vertical direction and a line extending in the horizontal direction in the image 121 is reduced. In this case, the distortion of the upper boundary line 201 and the left or right boundary line 202 in each of the two doors 200A and 200B is reduced, and the reflection of the casing 20 of the intercom handset 2 is eliminated. However, in this case, for the visitor 100B located on the left side of the image 121, the horizontal distortion is reduced, but it is extended in the vertical direction by the vertical distortion correction. As a result, the perspective between the visitor 100B and the automatic door 200 located behind the visitor 100B is exaggerated, resulting in an unnatural image.
　上述のように、画像１２１の全体に対して水平方向のみに歪み補正を行ったり、水平方向及び鉛直方向に歪み補正（２次元方向歪み補正）を行った場合には、インターホン子機２の筐体２０の一部が画像１２１内に写り込んだり、不自然な画像になってしまう。すなわち、画像１２１の全体に対して同じ歪み補正を行った場合には、画像歪みの低減と視覚的な違和感の低減とを両立することができない可能性がある。 As described above, when distortion correction is performed on the entire image 121 only in the horizontal direction, or when distortion correction (two-dimensional distortion correction) is performed in the horizontal and vertical directions, the housing of the interphone slave unit 2 is used. A part of the body 20 is reflected in the image 121 or becomes an unnatural image. That is, when the same distortion correction is performed on the entire image 121, it may not be possible to achieve both reduction in image distortion and reduction in visual discomfort.
　そこで、本実施形態の画像補正部２３は、図５Ａ及び図５Ｂに示すように、画像１２１を複数（図示例では２つ）の領域（第１領域１２１１及び第２領域１２１２）に分割し、複数の領域の各々に対して互いに異なる歪み補正を行うように構成されている。以下、本実施形態の画像補正部２３の歪み補正処理について、図５Ａ及び図５Ｂを参照して具体的に説明する。 Therefore, the image correction unit 23 according to the present embodiment divides the image 121 into a plurality of regions (two in the illustrated example) (first region 1211 and second region 1212), as shown in FIGS. 5A and 5B. Different distortion corrections are performed on each of the plurality of regions. Hereinafter, the distortion correction processing of the image correction unit 23 of the present embodiment will be specifically described with reference to FIGS. 5A and 5B.
　図５Ａは、上述の図３Ａ及び図４Ａと同様に、撮像部２１によって撮像された画像１２１の概略図である。本実施形態の画像補正部２３は、図５Ａに示すように、画像１２１の上下方向における中心線Ｌ１により画像１２１の領域を上下方向に２分割（２等分）している。中心線Ｌ１よりも上側（一方）の領域は第１領域１２１１であり、中心線Ｌ１よりも下側（他方）の領域は第２領域１２１２である。本実施形態では、中心線Ｌ１は、撮像部２１の撮像素子２１１の中心軸Ｐ２（図２参照）と交わるように設定されている。 FIG. 5A is a schematic diagram of an image 121 imaged by the imaging unit 21 as in FIGS. 3A and 4A described above. As shown in FIG. 5A, the image correction unit 23 of the present embodiment divides the region of the image 121 into two in the vertical direction (divided into two equal parts) by the center line L1 in the vertical direction of the image 121. The region above (one side) the center line L1 is the first region 1211, and the region below (the other side) the center line L1 is the second region 1212. In the present embodiment, the center line L1 is set so as to intersect with the center axis P2 (see FIG. 2) of the image pickup device 211 of the image pickup unit 21.
　画像補正部２３は、図５Ａに示すように、記憶部２６に予め記録された第１歪み補正パターン、第２歪み補正パターン及び第３歪み補正パターンの中から、第１歪み補正パターンを選択し、第１領域１２１１に対して歪み補正を行う。すなわち、画像補正部２３は、第１領域１２１１に対しては、水平方向（画像１２１の左右方向）の歪みを補正する第１歪み補正を行う。これにより、第１領域１２１１では、画像１２１の左側に位置する来訪者１００Ｂの歪みが低減され、かつ２枚の扉２００Ａ，２００Ｂの各々の左側又は右側の境界線２０２の歪みが低減される（図５Ｂ参照）。一方、２枚の扉２００Ａ，２００Ｂの上側の境界線２０１については歪みが残っている。 As shown in FIG. 5A, the image correction unit 23 selects the first distortion correction pattern from the first distortion correction pattern, the second distortion correction pattern, and the third distortion correction pattern recorded in advance in the storage unit 26. Then, distortion correction is performed on the first region 1211. That is, the image correction unit 23 performs first distortion correction on the first region 1211 to correct distortion in the horizontal direction (the left-right direction of the image 121). Thereby, in the first region 1211, the distortion of the visitor 100B located on the left side of the image 121 is reduced, and the distortion of the left or right boundary line 202 of each of the two doors 200A and 200B is reduced ( (See FIG. 5B). On the other hand, distortion remains in the upper boundary line 201 of the two doors 200A and 200B.
　画像補正部２３は、第２領域１２１２に対しては第２歪み補正パターンを選択する。すなわち、画像補正部２３は、第２領域１２１２に対しては、水平方向及び鉛直方向（画像１２１の上下方向）の歪みを補正する第２歪み補正を行う。これにより、第２領域１２１２では、来訪者１００Ｂの歪みが低減され、かつ２枚の扉２００Ａ，２００Ｂの各々の左側又は右側の境界線２０２の歪みが低減される。さらに、第２領域１２１２については、鉛直方向の歪みも補正することで筐体２０の写り込みもなくなる（図５Ｂ参照）。 The image correction unit 23 selects the second distortion correction pattern for the second region 1212. That is, the image correction unit 23 performs second distortion correction on the second region 1212 to correct distortion in the horizontal direction and the vertical direction (up and down direction of the image 121). As a result, in the second region 1212, the distortion of the visitor 100B is reduced, and the distortion of the left or right boundary line 202 of each of the two doors 200A, 200B is reduced. Further, the second region 1212 also eliminates the reflection of the housing 20 by correcting the vertical distortion (see FIG. 5B).
　上述のように、画像１２１の領域を第１領域１２１１及び第２領域１２１２に分割し、第１領域１２１１に対して第１歪み補正を行い、第２領域１２１２に対して第２歪み補正を行うことにより、画像歪みの低減と視覚的な違和感の低減とを両立することができる。 As described above, the region of the image 121 is divided into the first region 1211 and the second region 1212, the first distortion correction is performed on the first region 1211, and the second distortion correction is performed on the second region 1212. As a result, it is possible to achieve both reduction in image distortion and reduction in visual discomfort.
　ところで、上述の実施形態では、画像補正部２３は、画像１２１の領域を２つの領域（第１領域１２１１及び第２領域１２１２）に分割したが、画像１２１の分割数は２つに限らない。本実施形態のインターホン子機２は、上述のように、地面と平行な水平面に対して傾斜して取り付けられるため、取付面３１の傾斜角度θ２に応じて、画像１２１における来訪者１００Ａ，１００Ｂ及び自動ドア２００の位置が変化する。そのため、画像補正部２３は、取付面３１の傾斜角度θ２に応じて画像１２１の分割数を変更するように構成されていることが好ましい。なお、取付面３１の傾斜角度θ２は、上述の操作部２５を介して入力することができる。以下、本実施形態の変形例１について図６Ａ～図６Ｃを参照して具体的に説明する。 In the above-described embodiment, the image correction unit 23 divides the area of the image 121 into two areas (the first area 1211 and the second area 1212), but the number of divisions of the image 121 is not limited to two. As described above, the interphone slave unit 2 according to the present embodiment is attached to be inclined with respect to a horizontal plane parallel to the ground. Therefore, depending on the inclination angle θ2 of the attachment surface 31, the visitors 100A and 100B in the image 121 and The position of the automatic door 200 changes. Therefore, it is preferable that the image correction unit 23 is configured to change the number of divisions of the image 121 according to the inclination angle θ <b> 2 of the attachment surface 31. The inclination angle θ2 of the attachment surface 31 can be input via the operation unit 25 described above. Hereinafter, Modification 1 of the present embodiment will be specifically described with reference to FIGS. 6A to 6C.
　画像補正部２３は、図６Ａに示すように、取付面３１の傾斜角度θ２に応じて複数（図示例では４つ）の領域（第１領域１２１１、第２領域１２１２、第３領域１２１３及び第４領域１２１４）に分割し、複数の領域の各々に対して互いに異なる歪み補正を行う。なお、図６Ａ中のＰＬ１、ＰＬ２、ＰＬ３は分割線である。 As shown in FIG. 6A, the image correction unit 23 includes a plurality of (four in the illustrated example) regions (first region 1211, second region 1212, third region 1213, and first region) according to the inclination angle θ 2 of the mounting surface 31. 4 regions 1214), and different distortion correction is performed on each of the plurality of regions. In FIG. 6A, PL1, PL2, and PL3 are dividing lines.
　例えば、取付面３１の傾斜角度θ２が３０度の場合、画像補正部２３は、図６Ｂに示すように、２つの分割線ＰＬ１、ＰＬ２によって画像１２１を第１領域１２１１、第２領域１２１２及び第３領域１２１３に分割する。この場合、画像補正部２３は、来訪者１００の顔が含まれていると想定される第１領域１２１１に対しては、水平方向（画像１２１の左右方向）の歪みを補正する第１歪み補正を行う。また、画像補正部２３は、第１領域１２１１と第３領域１２１３との間の第２領域１２１２に対しては、水平方向及び鉛直方向（画像１２１の上下方向）の歪みを補正する第２歪み補正（２次元方向歪み補正）を行う。さらに、画像補正部２３は、インターホン子機２の筐体２０の写り込みが生じている第３領域１２１３に対しては、水平方向及び鉛直方向の歪みを補正する第３歪み補正を行う。このとき、画像補正部２３は、第３歪み補正において、筐体２０が第３領域１２１３に写り込まないように、第２歪み補正に比べて鉛直方向の補正強度を強くすることが好ましい。 For example, when the inclination angle θ2 of the mounting surface 31 is 30 degrees, the image correction unit 23 converts the image 121 into the first region 1211, the second region 1212, and the second region by two dividing lines PL1 and PL2, as shown in FIG. 6B. The area is divided into three areas 1213. In this case, the image correction unit 23 corrects the distortion in the horizontal direction (the left-right direction of the image 121) for the first region 1211 that is assumed to include the face of the visitor 100. I do. In addition, the image correction unit 23 corrects the distortion in the horizontal direction and the vertical direction (the vertical direction of the image 121) for the second area 1212 between the first area 1211 and the third area 1213. Correction (two-dimensional distortion correction) is performed. Further, the image correction unit 23 performs third distortion correction for correcting the distortion in the horizontal direction and the vertical direction for the third region 1213 in which the housing 20 of the intercom slave device 2 is reflected. At this time, the image correction unit 23 preferably increases the correction strength in the vertical direction compared to the second distortion correction so that the housing 20 does not appear in the third region 1213 in the third distortion correction.
　また、取付面３１の傾斜角度θ２が４５度の場合には、画像補正部２３は、図６Ｃに示すように、１つの分割線ＰＬ１によって画像１２１を第１領域１２１１及び第２領域１２１２に分割する。この場合、画像補正部２３は、来訪者１００の顔が含まれていると想定される第１領域１２１１に対しては、水平方向の歪みを補正する第１歪み補正を行う。また、画像補正部２３は、インターホン子機２の筐体２０の写り込みが生じている第２領域１２１２に対しては、水平方向及び鉛直方向の歪みを補正する第２歪み補正を行う。ここで、取付面３１の傾斜角度が大きくなるに従って筐体２０の写り込み量は小さくなるため、画像補正部２３は、取付面３１の傾斜角度θ２が３０度の場合に比べて鉛直方向の補正強度を弱くすることが好ましい。 When the inclination angle θ2 of the mounting surface 31 is 45 degrees, the image correction unit 23 divides the image 121 into a first area 1211 and a second area 1212 by one dividing line PL1, as shown in FIG. 6C. To do. In this case, the image correction unit 23 performs the first distortion correction for correcting the distortion in the horizontal direction for the first region 1211 that is assumed to include the face of the visitor 100. In addition, the image correction unit 23 performs second distortion correction for correcting distortion in the horizontal direction and the vertical direction for the second region 1212 in which the housing 20 of the intercom slave device 2 is reflected. Here, since the amount of reflection of the housing 20 decreases as the inclination angle of the attachment surface 31 increases, the image correction unit 23 corrects the vertical direction as compared with the case where the inclination angle θ2 of the attachment surface 31 is 30 degrees. It is preferable to reduce the strength.
　上述のように、取付面３１の傾斜角度θ２に応じて画像１２１の分割数（複数の領域の分割数）を変更することにより、取付面３１の傾斜角度θ２に応じた歪み補正を行うことができる。 As described above, the distortion correction according to the inclination angle θ2 of the attachment surface 31 can be performed by changing the number of divisions of the image 121 (the number of divisions of the plurality of regions) according to the inclination angle θ2 of the attachment surface 31. it can.
　ところで、上述の変形例１では、インターホン子機２が取り付けられる取付面３１の傾斜角度θ２に応じて画像１２１の分割数を変更したが、例えば撮像素子２１１に対するレンズ２１２の傾斜角度α１に応じて画像１２１の分割数を変更してもよい。以下、本実施形態の変形例２について図６Ｂ、図６Ｃ及び図７を参照して具体的に説明する。 In the first modification, the number of divisions of the image 121 is changed in accordance with the inclination angle θ2 of the mounting surface 31 to which the interphone slave unit 2 is attached. The number of divisions of the image 121 may be changed. Hereinafter, Modification 2 of the present embodiment will be specifically described with reference to FIGS. 6B, 6 </ b> C, and 7.
　図７は、本実施形態の変形例２に係るインターホン子機２の設置例を示す概略図である。インターホン子機２は、上述のように、撮像素子２１１に対してレンズ２１２が傾斜可能に構成されている。撮像素子２１１の中心軸Ｐ２（図２参照）とレンズ２１２の中心軸とが一致する場合、撮像部２１の光軸Ｐ１はＰ１１となる。撮像素子２１１に対するレンズ２１２の傾斜角度α１をα１１とした場合、撮像部２１の光軸Ｐ１はＰ１２となる。また、撮像素子２１１に対するレンズ２１２の傾斜角度α１をα１２（α１２＞α１１）とした場合、撮像部２１の光軸Ｐ１はＰ１３となる。 FIG. 7 is a schematic diagram illustrating an installation example of the intercom slave device 2 according to the second modification of the present embodiment. As described above, the intercom handset 2 is configured such that the lens 212 can be tilted with respect to the image sensor 211. When the central axis P2 (see FIG. 2) of the image sensor 211 and the central axis of the lens 212 coincide, the optical axis P1 of the imaging unit 21 is P11. When the inclination angle α1 of the lens 212 with respect to the imaging element 211 is α11, the optical axis P1 of the imaging unit 21 is P12. In addition, when the inclination angle α1 of the lens 212 with respect to the imaging element 211 is α12 (α12> α11), the optical axis P1 of the imaging unit 21 is P13.
　例えば、レンズ２１２の傾斜角度α１がα１１の場合には、画像補正部２３は、図６Ｃに示すように、１つの分割線ＰＬ１によって画像１２１を第１領域１２１１及び第２領域１２１２に分割する。この場合、画像補正部２３は、来訪者１００の顔が含まれていると想定される第１領域１２１１に対しては、水平方向の歪みを補正する第１歪み補正を行う。また、画像補正部２３は、インターホン子機２の筐体２０の写り込みが生じている第２領域１２１２に対しては、水平方向及び鉛直方向の歪みを補正する第２歪み補正を行う。 For example, when the inclination angle α1 of the lens 212 is α11, the image correction unit 23 divides the image 121 into the first region 1211 and the second region 1212 by one dividing line PL1, as shown in FIG. 6C. In this case, the image correction unit 23 performs the first distortion correction for correcting the distortion in the horizontal direction for the first region 1211 that is assumed to include the face of the visitor 100. In addition, the image correction unit 23 performs second distortion correction for correcting distortion in the horizontal direction and the vertical direction for the second region 1212 in which the housing 20 of the intercom slave device 2 is reflected.
　また、レンズ２１２の傾斜角度α１がα１２（α１２＞α１１）の場合には、画像補正部２３は、図６Ｂに示すように、２つの分割線ＰＬ１、ＰＬ２によって第１領域１２１１、第２領域１２１２及び第３領域１２１３に分割する。この場合、画像補正部２３は、来訪者１００の顔が含まれていると想定される第１領域１２１１に対しては、水平方向の歪みを補正する第１歪み補正を行う。また、画像補正部２３は、第１領域１２１１と第３領域１２１３との間の第２領域１２１２に対しては、水平方向及び鉛直方向の歪みを補正する第２歪み補正（２次元方向歪み補正）を行う。さらに、画像補正部２３は、インターホン子機２の筐体２０の写り込みが生じている第３領域１２１３に対しては、水平方向及び鉛直方向の歪みを補正する第３歪み補正を行う。このとき、画像補正部２３は、第３歪み補正において、筐体２０が第３領域１２１３に写り込まないように、第２歪み補正に比べて鉛直方向の補正強度を強くすることが好ましい。 When the inclination angle α1 of the lens 212 is α12 (α12> α11), the image correction unit 23, as shown in FIG. 6B, uses the first dividing area PL1 and the second dividing line PL2, and the second area 1212. And it divides into the 3rd field 1213. In this case, the image correction unit 23 performs the first distortion correction for correcting the distortion in the horizontal direction for the first region 1211 that is assumed to include the face of the visitor 100. In addition, the image correction unit 23 performs second distortion correction (two-dimensional distortion correction) on the second area 1212 between the first area 1211 and the third area 1213 to correct horizontal and vertical distortion. )I do. Further, the image correction unit 23 performs third distortion correction for correcting the distortion in the horizontal direction and the vertical direction for the third region 1213 in which the housing 20 of the intercom slave device 2 is reflected. At this time, the image correction unit 23 preferably increases the correction strength in the vertical direction compared to the second distortion correction so that the housing 20 does not appear in the third region 1213 in the third distortion correction.
　上述のように、撮像素子２１１に対するレンズ２１２の傾斜角度α１に応じて画像１２１の分割数（複数の領域の分割数）を変更することにより、レンズ２１２の傾斜角度α１に応じた歪み補正を行うことができる。 As described above, the distortion correction corresponding to the inclination angle α1 of the lens 212 is performed by changing the number of divisions of the image 121 (the number of divisions of the plurality of regions) according to the inclination angle α1 of the lens 212 with respect to the imaging element 211. be able to.
　ところで、上述の実施形態及び変形例１，２のように、画像補正部２３がＤＳＰ又はＦＰＧＡを主構成とする場合、プログラムによって、画像補正部２３の機能を実現可能である。すなわち、本実施形態に係るプログラムは、コンピュータを、インターホンシステム１０における画像補正部２３として機能させるためのプログラムである。このプログラムによれば、コンピュータを画像補正部２３として機能させることで、画像１２１の画像歪みを低減し、かつ視覚的な違和感を低減することができる。 By the way, when the image correction unit 23 has a DSP or FPGA as the main configuration as in the above-described embodiment and Modifications 1 and 2, the function of the image correction unit 23 can be realized by a program. That is, the program according to the present embodiment is a program for causing a computer to function as the image correction unit 23 in the intercom system 10. According to this program, by causing the computer to function as the image correction unit 23, it is possible to reduce image distortion of the image 121 and to reduce visual discomfort.
　以下、本実施形態の他の変形例について説明する。 Hereinafter, another modification of the present embodiment will be described.
　上述の実施形態及び変形例１，２では、インターホン子機２がロビーインターホンである場合を例として説明したが、インターホン子機２は、例えば集合住宅の住戸ごとに設置されるドアホン子機等であってもよい。また、インターホン親機１は、集合住宅の住戸内に設置される室内親機に限らず、例えば集合住宅の管理人室等に設置される管理室親機であってもよい。 In the above-described embodiment and Modifications 1 and 2, the case where the interphone slave unit 2 is a lobby intercom is described as an example. However, the interphone slave unit 2 is, for example, a door phone slave unit or the like installed in each dwelling unit of a housing complex. There may be. In addition, the intercom base unit 1 is not limited to the indoor base unit installed in the dwelling unit of the apartment house, and may be a management room base unit installed in a manager room of the apartment house, for example.
　また、上述の実施形態及び変形例１，２では、インターホンシステム１０を集合住宅に適用した場合を例として説明したが、インターホンシステム１０の適用対象は集合住宅に限らず、戸建て住宅であってもよい。この場合、インターホン親機１は、住宅内に設置される室内親機であり、インターホン子機２は、住宅の外玄関に設置されるドアホン子機である。また、インターホンシステム１０の適用対象は住宅に限らず、ビル又は工場等の非住宅であってもよい。 Moreover, although the case where the interphone system 10 was applied to an apartment house was described as an example in the above-described embodiment and Modifications 1 and 2, the application target of the interphone system 10 is not limited to an apartment house, and may be a detached house. Good. In this case, the interphone master device 1 is an indoor master device installed in a house, and the interphone slave device 2 is a door phone slave device installed at an outer entrance of the house. The application target of the intercom system 10 is not limited to a house, and may be a non-house such as a building or a factory.
　また、上述の実施形態及び変形例１，２では、画像１２１の全体を歪み補正の対象としているが、歪み補正の対象は画像１２１の一部であってもよい。この場合、画像補正部２３は、歪み補正の対象である画像１２１の一部を複数の領域に分割し、複数の領域の各々に対して互いに異なる歪み補正を行うように構成されていればよい。 In the above-described embodiment and Modifications 1 and 2, the entire image 121 is the target of distortion correction, but the target of distortion correction may be a part of the image 121. In this case, the image correction unit 23 may be configured to divide a part of the image 121 that is a distortion correction target into a plurality of areas and perform different distortion corrections on each of the plurality of areas. .
　さらに、上述の実施形態及び変形例１，２では、画像１２１を２分割する際に中心線Ｌ１によって２等分したが、中心線Ｌ１とは異なる分割線によって２分割してもよい。すなわち、上記分割線よりも上側の領域である第１領域と、上記分割線よりも下側の領域である第２領域とが異なる大きさであってもよい。また、画像１２１を３つ以上に分割した場合も同様であり、各領域を均等に分割してもよいし、均等に分割していなくてもよい。 Furthermore, in the above-described embodiment and Modifications 1 and 2, when the image 121 is divided into two equal parts by the center line L1, it may be divided into two parts by a dividing line different from the center line L1. That is, the first area, which is an area above the dividing line, and the second area, which is an area below the dividing line, may have different sizes. The same applies to the case where the image 121 is divided into three or more, and each region may be divided equally or may not be divided equally.
　また、上述の実施形態及び変形例１，２では、画像１２１において中心線Ｌ１よりも上側の領域が第１領域１２１１であり、下側の領域が第２領域１２１２であるが、第１領域１２１１と第２領域１２１２とが逆であってもよい。すなわち、画像１２１において中心線Ｌ１よりも上側の領域が第２領域１２１２であり、下側の領域が第１領域１２１１であってもよい。この構成によれば、例えば撮像部２１の光軸Ｐ１が上向きに設定されており、筐体２０の上側の一部が画像１２１に写り込むような場合に、筐体２０が画像１２１に写り込まないようにすることができる。 In the above-described embodiment and Modifications 1 and 2, the region above the center line L1 in the image 121 is the first region 1211 and the region below the second region 1212 is the first region 1211. And the second region 1212 may be reversed. In other words, the area above the center line L1 in the image 121 may be the second area 1212, and the area below the first line 1211 may be the first area 1211. According to this configuration, for example, when the optical axis P <b> 1 of the imaging unit 21 is set upward and a part of the upper side of the casing 20 is reflected in the image 121, the casing 20 is reflected in the image 121. Can not be.
　さらに、上述の変形例１，２では、施工時において施工者が取付面３１の傾斜角度θ２及びレンズ２１２の傾斜角度α１を入力するように構成した。これに対して、例えばレンズ２１２を自動的に傾斜させる機能によって、レンズ２１２の傾斜角度α１が自動的に入力されるように構成されていてもよい。また、インターホン子機２を取付台３に取り付けた際に取付面３１の傾斜角度θ２を自動的に計測するように構成されていてもよい。 Furthermore, in the above-described modified examples 1 and 2, the construction worker inputs the inclination angle θ2 of the mounting surface 31 and the inclination angle α1 of the lens 212 at the time of construction. On the other hand, for example, the tilt angle α1 of the lens 212 may be automatically input by the function of tilting the lens 212 automatically. Moreover, when the intercom handset 2 is attached to the mount 3, the inclination angle θ2 of the attachment surface 31 may be automatically measured.
　また、上述の実施形態及び変形例１，２では、インターホン親機１及びインターホン子機２を備えたインターホンシステム１０を例として説明したが、例えば防犯カメラ又は車載カメラ等に上記構成を適用してもよい。 In the above-described embodiment and Modifications 1 and 2, the interphone system 10 including the interphone master unit 1 and the interphone slave unit 2 has been described as an example. However, the above configuration is applied to a security camera or an in-vehicle camera, for example. Also good.
　さらに、上述の実施形態及び変形例１，２では、インターホン子機２が画像補正部２３を有している場合を例として説明したが、インターホン親機１が画像補正部を有していてもよい。 Further, in the above-described embodiment and Modifications 1 and 2, the case where the interphone slave unit 2 includes the image correction unit 23 has been described as an example. However, even if the interphone master unit 1 includes the image correction unit. Good.
　また、上述の実施形態及び変形例１，２では、インターホン親機１が表示部１２を有している場合を例として説明した。これに対して、インターホン親機１とともに住戸内に設置される室内子機が表示部を有していてもよいし、スマートフォンやタブレット端末などの汎用の携帯情報端末（ＰＤＡ：Personal Digital Assistant）が表示部を有していてもよい。 In the above-described embodiment and Modifications 1 and 2, the case where the intercom base unit 1 has the display unit 12 has been described as an example. On the other hand, the indoor cordless handset installed in the dwelling unit together with the interphone master unit 1 may have a display unit, or a general-purpose portable information terminal (PDA: Personal Digital Assistant) such as a smartphone or a tablet terminal. You may have a display part.
　また、上述の実施形態及び変形例１，２では、撮像素子２１１に対してレンズ２１２が傾斜可能に構成されている場合を例として説明したが、撮像素子２１１及びレンズ２１２が一体に回転可能に構成されていてもよい。この場合、画像補正部２３は、歪み補正処理において、撮像素子２１１及びレンズ２１２の傾斜角度に応じて、複数の領域の分割数を変更するように構成されていることが好ましい。また、画像補正部２３は、歪み補正処理において、複数の領域の各々に対して行う歪み補正を、撮像素子２１１及びレンズ２１２の傾斜角度に応じて、第１歪み補正と第２歪み補正と第３歪み補正との中から選択して行うように構成されていてもよい。第１歪み補正は、画像の左右方向の歪みを補正する補正である。第２歪み補正は、画像の左右方向及び上下方向の歪みを補正する補正である。第３歪み補正は、第２歪み補正とは異なる補正強度で画像の左右方向及び上下方向の歪みを補正する補正である。 In the above-described embodiment and Modifications 1 and 2, the case where the lens 212 is configured to be tiltable with respect to the image sensor 211 has been described as an example. However, the image sensor 211 and the lens 212 can be rotated together. It may be configured. In this case, it is preferable that the image correction unit 23 is configured to change the number of divisions of the plurality of regions in accordance with the inclination angles of the imaging element 211 and the lens 212 in the distortion correction processing. In addition, the image correction unit 23 performs distortion correction performed on each of the plurality of regions in the distortion correction processing in accordance with the first distortion correction, the second distortion correction, and the first distortion correction according to the inclination angles of the imaging element 211 and the lens 212. You may comprise so that it may select and perform from 3 distortion correction. The first distortion correction is correction for correcting distortion in the horizontal direction of the image. The second distortion correction is correction for correcting distortion in the horizontal direction and vertical direction of the image. The third distortion correction is correction for correcting distortion in the horizontal direction and the vertical direction of the image with a correction intensity different from that of the second distortion correction.
　以上述べた実施形態から明らかなように、第１の態様のインターホンシステム（１０）は、インターホン親機（１）及びインターホン子機（２）が互いに通信可能に構成されたインターホンシステムである。インターホンシステム（１０）は、インターホン子機（２）の撮像部（２１）で撮像した画像の歪みを補正する歪み補正処理を行う画像補正部（２３）を備える。画像補正部（２３）は、歪み補正処理において、画像における歪み補正の対象となる領域を複数の領域に分割し、複数の領域の各々に対して互いに異なる歪み補正を行うように構成されている。 As is clear from the embodiment described above, the interphone system (10) of the first aspect is an interphone system in which the interphone master unit (1) and the interphone slave unit (2) are configured to be able to communicate with each other. The intercom system (10) includes an image correction unit (23) that performs distortion correction processing for correcting distortion of an image captured by the imaging unit (21) of the interphone slave unit (2). The image correction unit (23) is configured to divide a region for distortion correction in an image into a plurality of regions and perform different distortion correction on each of the plurality of regions in the distortion correction processing. .
　第１の態様によれば、画像補正部（２３）は、歪み補正の対象となる領域を複数の領域に分割し、複数の領域の各々に対して互いに異なる歪み補正を行うので、画像全体に同じ歪み補正を行う場合に比べて画像歪みを低減し、かつ視覚的な違和感を低減することができる。 According to the first aspect, the image correction unit (23) divides the region to be subjected to distortion correction into a plurality of regions and performs different distortion correction on each of the plurality of regions, so that the entire image is corrected. Image distortion can be reduced and visual discomfort can be reduced as compared to the case where the same distortion correction is performed.
　第２の態様に係るインターホンシステム（１０）は、第１の態様において、画像補正部（２３）により得られる補正後の画像、又は補正後の画像の画像信号に基づく画像を表示する表示部（１２）を備える。 The intercom system (10) according to the second aspect is the display unit (10) that displays an image based on the image signal of the corrected image obtained by the image correction unit (23) or the image after correction in the first aspect. 12).
　第２の態様によれば、画像補正部（２３）により補正した後の画像を表示部（１２）に表示することができる。 According to the second aspect, the image corrected by the image correction unit (23) can be displayed on the display unit (12).
　第３の態様のインターホンシステム（１０）では、第１又は２の態様において、画像補正部（２３）は、複数の領域として、第１領域（１２１１）と第２領域（１２１２）とに分割するように構成されている。第１領域（１２１１）は、画像（１２１）を上下方向において２分割した一方の領域からなる。第２領域（１２１２）は、画像（１２１）を上下方向において２分割した他方の領域からなる。 In the intercom system (10) of the third aspect, in the first or second aspect, the image correction unit (23) divides the plurality of areas into a first area (1211) and a second area (1212). It is configured as follows. The first area (1211) is composed of one area obtained by dividing the image (121) into two in the vertical direction. The second area (1212) is composed of the other area obtained by dividing the image (121) into two in the vertical direction.
　第３の態様によれば、第１領域（１２１１）及び第２領域（１２１２）に対して互いに異なる歪み補正を行うことにより、画像の分割数を少なくしながらも、画像歪みを低減し、かつ視覚的な違和感を低減することができる。ただし、この構成はインターホンシステム（１０）の必須の構成ではなく、例えば複数の領域として、３つ以上の領域に分割されていてもよい。 According to the third aspect, by performing different distortion correction on the first area (1211) and the second area (1212), the image distortion can be reduced while reducing the number of image divisions, and Visual discomfort can be reduced. However, this configuration is not an essential configuration of the intercom system (10), and may be divided into three or more regions as a plurality of regions, for example.
　第４の態様のインターホンシステム（１０）では、第３の態様において、第１領域（１２１１）と第２領域（１２１２）とは、画像（１２１）の上下方向における中心線（Ｌ１）により２等分された２つの領域である。 In the intercom system (10) according to the fourth aspect, in the third aspect, the first area (1211) and the second area (1212) are equal to each other by the center line (L1) in the vertical direction of the image (121). It is two divided areas.
　第４の態様によれば、中心線（Ｌ１）によって２つの領域に２等分しているので、人物（来訪者）を撮像した場合には、一方の領域に来訪者の顔を含めることができる。そして、顔を含む一方の領域に対しては水平方向（画像（１２１）の左右方向）のみに歪み補正を行うことにより、来訪者の顔が不自然に変形することを低減することができる。ただし、この構成を採用するか否かは任意である。 According to the fourth aspect, since the area is equally divided into two areas by the center line (L1), when a person (visitor) is imaged, the face of the visitor may be included in one area. it can. Further, by performing distortion correction only in the horizontal direction (left and right direction of the image (121)) for one region including the face, it is possible to reduce the unnatural deformation of the visitor's face. However, whether or not to adopt this configuration is arbitrary.
　第５の態様のインターホンシステム（１０）では、第３又は４の態様において、画像補正部（２３）は、歪み補正処理において、第１歪み補正を第１領域（１２１１）に行い、第２歪み補正を第２領域（１２１２）に行うように構成されている。第１歪み補正では、画像（１２１）の左右方向の歪みを補正する。第２歪み補正では、画像（１２１）の左右方向及び上下方向の歪みを補正する。 In the intercom system (10) of the fifth aspect, in the third or fourth aspect, the image correction unit (23) performs the first distortion correction on the first region (1211) in the distortion correction processing, and the second distortion The correction is performed on the second region (1212). In the first distortion correction, the distortion in the horizontal direction of the image (121) is corrected. In the second distortion correction, distortion in the horizontal direction and vertical direction of the image (121) is corrected.
　第５の態様によれば、画像全体に第１歪み補正を行う場合に比べて筐体（２０）の写り込みを低減することができ、画像全体に第２歪み補正を行う場合に比べて人物（来訪者）の顔が不自然に変形することを低減することができる。つまり、第４の態様によれば、画像全体に同じ歪み補正を行う場合に比べて、画像歪みを低減し、かつ視覚的な違和感を低減することができる。ただし、この構成を採用するか否かは任意である。 According to the fifth aspect, the reflection of the housing (20) can be reduced compared to the case where the first distortion correction is performed on the entire image, and the person is compared with the case where the second distortion correction is performed on the entire image. It is possible to reduce the unnatural deformation of the (visitor) face. That is, according to the fourth aspect, it is possible to reduce image distortion and to reduce visual discomfort compared to a case where the same distortion correction is performed on the entire image. However, whether or not to adopt this configuration is arbitrary.
　第６の態様のインターホンシステム（１０）では、第１又は２の態様において、撮像部（２１）は、撮像素子（２１１）に対して傾斜可能なレンズ（２１２）を更に含む。画像補正部（２３）は、歪み補正処理において、レンズ（２１２）の傾斜角度（α１）に応じて、複数の領域の分割数を変更するように構成されている。 In the intercom system (10) of the sixth aspect, in the first or second aspect, the imaging unit (21) further includes a lens (212) that can be tilted with respect to the imaging element (211). The image correction unit (23) is configured to change the number of divisions of the plurality of regions in accordance with the inclination angle (α1) of the lens (212) in the distortion correction processing.
　第６の態様によれば、レンズ（２１２）の傾斜角度（α１）に応じた歪み補正処理を行うことができる。ただし、この構成はインターホンシステム（１０）の必須の構成ではなく、例えばレンズ（２１２）の傾斜角度（α１）にかかわらず、複数の領域の分割数が一定であってもよい。 According to the sixth aspect, it is possible to perform distortion correction processing according to the tilt angle (α1) of the lens (212). However, this configuration is not an essential configuration of the intercom system (10). For example, the number of divisions of the plurality of regions may be constant regardless of the inclination angle (α1) of the lens (212).
　第７の態様のインターホンシステム（１０）では、第６の態様において、画像補正部（２３）は、歪み補正処理において、複数の領域の各々に対して行う歪み補正を、レンズ（２１２）の傾斜角度（α１）に応じて、第１歪み補正と第２歪み補正と第３歪み補正との中から選択する。第１歪み補正では、画像（１２１）の左右方向の歪みを補正する。第２歪み補正では、画像（１２１）の左右方向及び上下方向の歪みを補正する。第３歪み補正では、第２歪み補正とは異なる補正強度で画像（１２１）の左右方向及び上下方向の歪みを補正する。 In the intercom system (10) according to the seventh aspect, in the sixth aspect, the image correction unit (23) performs distortion correction performed on each of the plurality of regions in the distortion correction processing, by tilting the lens (212). Depending on the angle (α1), the first distortion correction, the second distortion correction, and the third distortion correction are selected. In the first distortion correction, the distortion in the horizontal direction of the image (121) is corrected. In the second distortion correction, distortion in the horizontal direction and vertical direction of the image (121) is corrected. In the third distortion correction, distortion in the horizontal direction and the vertical direction of the image (121) is corrected with a correction intensity different from that of the second distortion correction.
　第７の態様によれば、複数の領域の各々に対して行う歪み補正を、レンズ（２１２）の傾斜角度（α１）に応じて、第１歪み補正と第２歪み補正と第３歪み補正との中から選択することができる。ただし、この構成を採用するか否かは任意である。 According to the seventh aspect, the first distortion correction, the second distortion correction, the third distortion correction, and the distortion correction performed on each of the plurality of regions are performed according to the inclination angle (α1) of the lens (212). You can choose from. However, whether or not to adopt this configuration is arbitrary.
　第８の態様のインターホンシステム（１０）では、第１、２、６又は７の態様において、インターホン子機（２）は、撮像部（２１）及び送信部（２２１）が収納される筐体（２０）を更に有する。筐体（２０）は、取付面（３１）が傾斜している取付台（３）の取付面（３１）に、撮像素子（２１１）の中心軸（Ｐ２）が取付面（３１）の法線方向と平行になるように取り付けられる。画像補正部（２３）は、歪み補正処理において、取付面（３１）の傾斜角度（θ２）に応じて、複数の領域の分割数を変更するように構成されている。 In the intercom system (10) according to the eighth aspect, in the first, second, sixth, or seventh aspect, the interphone slave unit (2) includes a housing (1) that houses the imaging unit (21) and the transmission unit (221). 20). The housing (20) has a mounting surface (31) of the mounting base (3) whose mounting surface (31) is inclined, and the central axis (P2) of the image sensor (211) is a normal line of the mounting surface (31). It is attached so as to be parallel to the direction. The image correction unit (23) is configured to change the number of divisions of the plurality of regions in accordance with the inclination angle (θ2) of the attachment surface (31) in the distortion correction processing.
　第８の態様によれば、取付面（３１）の傾斜角度（θ２）に応じた歪み補正処理を行うことができる。ただし、この構成はインターホンシステム（１０）の必須の構成ではなく、例えば取付面（３１）の傾斜角度（θ２）にかかわらず、複数の領域の分割数が一定であってもよい。 According to the 8th aspect, the distortion correction process according to the inclination angle ((theta) 2) of a mounting surface (31) can be performed. However, this configuration is not an essential configuration of the intercom system (10). For example, the number of divisions of the plurality of regions may be constant regardless of the inclination angle (θ2) of the attachment surface (31).
　第９の態様のインターホンシステム（１０）では、第８の態様において、画像補正部（２３）は、歪み補正処理において、複数の領域の各々に対して行う歪み補正を、取付面（３１）の傾斜角度（θ２）に応じて、第１歪み補正と第２歪み補正と第３歪み補正との中から選択する。第１歪み補正では、画像（１２１）の左右方向の歪みを補正する。第２歪み補正では、画像（１２１）の左右方向及び上下方向の歪みを補正する。第３歪み補正では、第２歪み補正とは異なる補正強度で画像（１２１）の左右方向及び上下方向の歪みを補正する。 In the intercom system (10) of the ninth aspect, in the eighth aspect, the image correction unit (23) performs distortion correction on each of the plurality of regions in the distortion correction processing of the attachment surface (31). According to the inclination angle (θ2), the first distortion correction, the second distortion correction, and the third distortion correction are selected. In the first distortion correction, the distortion in the horizontal direction of the image (121) is corrected. In the second distortion correction, distortion in the horizontal direction and vertical direction of the image (121) is corrected. In the third distortion correction, distortion in the horizontal direction and the vertical direction of the image (121) is corrected with a correction intensity different from that of the second distortion correction.
　第９の態様によれば、複数の領域の各々に対して行う歪み補正を、取付面（３１）の傾斜角度（θ２）に応じて、第１歪み補正と、第２歪み補正と、第３歪み補正と、の中から選択することができる。ただし、この構成を採用するか否かは任意である。 According to the ninth aspect, the first distortion correction, the second distortion correction, and the third distortion correction are performed on each of the plurality of regions according to the inclination angle (θ2) of the attachment surface (31). You can choose between distortion correction. However, whether or not to adopt this configuration is arbitrary.
　第１０の態様のインターホン親機（１）は、第１～９のいずれかの態様のインターホンシステム（１０）に用いられる。 The interphone base unit (1) according to the tenth aspect is used for the interphone system (10) according to any one of the first to ninth aspects.
　第１０の態様によれば、インターホン親機（１）を用いることによって、画像歪みを低減し、かつ視覚的な違和感を低減することができるインターホンシステム（１０）を提供することができる。 According to the tenth aspect, by using the interphone base unit (1), it is possible to provide the interphone system (10) that can reduce image distortion and reduce visual discomfort.
　第１１の態様のインターホン子機（２）は、第１～９のいずれかの態様のインターホンシステム（１０）に用いられる。 The eleventh aspect of the interphone slave unit (2) is used in the intercom system (10) of any one of the first to ninth aspects.
　第１１の態様によれば、インターホン子機（２）を用いることによって、画像歪みを低減し、かつ視覚的な違和感を低減することができるインターホンシステム（１０）を提供することができる。 According to the eleventh aspect, by using the interphone slave unit (2), it is possible to provide the interphone system (10) that can reduce image distortion and reduce visual discomfort.
　第１２の態様のプログラムは、コンピュータを、第１～９のいずれかの態様のインターホンシステム（１０）における画像補正部（２３）として機能させる。 The program of the twelfth aspect causes the computer to function as the image correction unit (23) in the intercom system (10) of any one of the first to ninth aspects.
　第１２の態様によれば、コンピュータを画像補正部（２３）として機能させることで、画像歪みを低減し、かつ視覚的な違和感を低減することができる。 According to the twelfth aspect, by causing the computer to function as the image correction unit (23), it is possible to reduce image distortion and to reduce visual discomfort.
１　インターホン親機
２　インターホン子機
３　取付台
１０　インターホンシステム
１２　表示部
２１　撮像部
２３　画像補正部
３１　取付面
１１１　受信部
１２１　画像
２１１　撮像素子
２１２　レンズ
２２１　送信部
１２１１　第１領域
１２１２　第２領域
α１　傾斜角度
θ２　傾斜角度
Ｌ１　中心線
Ｐ２　中心軸 DESCRIPTION OF SYMBOLS 1 Interphone main unit 2 Interphone subunit | mobile_unit 3 Mounting base 10 Interphone system 12 Display part 21 Image pick-up part 23 Image correction part 31 Mounting surface 111 Reception part 121 Image 211 Image pick-up element 212 Lens 221 Transmission part 1211 1st area | region 1212 2nd area | region (alpha) 1 inclination Angle θ2 Inclination angle L1 Center line P2 Center axis

Claims (12)

  1. 　インターホン親機及びインターホン子機が互いに通信可能に構成されたインターホンシステムにおいて、
    　前記インターホン子機の撮像部で撮像した画像の歪みを補正する歪み補正処理を行う画像補正部を備え、
    　前記画像補正部は、前記歪み補正処理において、前記画像における歪み補正の対象となる領域を複数の領域に分割し、前記複数の領域の各々に対して互いに異なる歪み補正を行うように構成されている
    　ことを特徴とするインターホンシステム。     In the interphone system in which the interphone master unit and the interphone slave unit are configured to be able to communicate with each other,
    An image correction unit that performs a distortion correction process for correcting distortion of an image captured by the image capturing unit of the intercom handset;
    The image correction unit is configured to divide a region to be subjected to distortion correction in the image into a plurality of regions in the distortion correction processing, and perform different distortion correction on each of the plurality of regions. An intercom system characterized by
  2. 　前記画像補正部により得られる補正後の画像、又は前記補正後の画像の画像信号に基づく画像を表示する表示部を備える
    　ことを特徴とする請求項１に記載のインターホンシステム。     The intercom system according to claim 1, further comprising: a display unit that displays a corrected image obtained by the image correction unit or an image based on an image signal of the corrected image.
  3. 　前記画像補正部は、前記複数の領域として、前記画像を上下方向において２分割した一方の領域からなる第１領域と、他方の領域からなる第２領域と、に分割するように構成されている
    　ことを特徴とする請求項１又は２に記載のインターホンシステム。     The image correcting unit is configured to divide the image into a first region formed of one region obtained by dividing the image into two in the vertical direction and a second region formed of the other region as the plurality of regions. The intercom system according to claim 1 or 2, wherein
  4. 　前記第１領域と前記第２領域とは、前記画像の上下方向における中心線により２等分された２つの領域である
    　ことを特徴とする請求項３に記載のインターホンシステム。     The intercom system according to claim 3, wherein the first region and the second region are two regions divided into two equal parts by a center line in the vertical direction of the image.
  5. 　前記画像補正部は、前記歪み補正処理において、前記画像の左右方向の歪みを補正する第１歪み補正を前記第１領域に行い、前記画像の左右方向及び上下方向の歪みを補正する第２歪み補正を前記第２領域に行うように構成されている
    　ことを特徴とする請求項３又は４に記載のインターホンシステム。     In the distortion correction process, the image correction unit performs first distortion correction on the first region to correct distortion in the horizontal direction of the image, and corrects distortion in the horizontal direction and vertical direction of the image. The intercom system according to claim 3 or 4, wherein correction is performed on the second region.
  6. 　前記撮像部は、前記撮像素子に対して傾斜可能なレンズを更に含み、
    　前記画像補正部は、前記歪み補正処理において、前記レンズの傾斜角度に応じて、前記複数の領域の分割数を変更するように構成されている
    　ことを特徴とする請求項１又は２に記載のインターホンシステム。     The imaging unit further includes a lens that can be tilted with respect to the imaging element,
    The said image correction part is comprised so that the division | segmentation number of these several area | regions may be changed according to the inclination-angle of the said lens in the said distortion correction process. Intercom system.
  7. 　前記画像補正部は、前記歪み補正処理において、前記複数の領域の各々に対して行う歪み補正を、前記レンズの傾斜角度に応じて、前記画像の左右方向の歪みを補正する第１歪み補正と、前記画像の左右方向及び上下方向の歪みを補正する第２歪み補正と、前記第２歪み補正とは異なる補正強度で前記画像の左右方向及び上下方向の歪みを補正する第３歪み補正と、の中から選択して行うように構成されている
    　ことを特徴とする請求項６に記載のインターホンシステム。     In the distortion correction process, the image correction unit performs a distortion correction performed on each of the plurality of areas, and a first distortion correction that corrects a distortion in the horizontal direction of the image according to an inclination angle of the lens. Second distortion correction for correcting distortion in the horizontal and vertical directions of the image, and third distortion correction for correcting distortion in the horizontal and vertical directions of the image with a correction intensity different from that of the second distortion correction; The intercom system according to claim 6, wherein the interphone system is configured to be selected and performed.
  8. 　前記インターホン子機は、前記撮像部及び前記送信部が収納される筐体を更に有し、
    　前記筐体は、取付面が傾斜している取付台の前記取付面に、前記撮像素子の中心軸が前記取付面の法線方向と平行になるように取り付けられ、
    　前記画像補正部は、前記歪み補正処理において、前記取付面の傾斜角度に応じて、前記複数の領域の分割数を変更するように構成されている
    　ことを特徴とする請求項１、２、６又は７に記載のインターホンシステム。     The intercom handset further includes a housing in which the imaging unit and the transmission unit are housed,
    The housing is attached to the mounting surface of the mounting base having an inclined mounting surface so that the central axis of the imaging element is parallel to the normal direction of the mounting surface,
    The said image correction part is comprised so that the division | segmentation number of these area | regions may be changed according to the inclination angle of the said attachment surface in the said distortion correction process. Or the intercom system of 7.
  9. 　前記画像補正部は、前記歪み補正処理において、前記複数の領域の各々に対して行う歪み補正を、前記取付面の傾斜角度に応じて、前記画像の左右方向の歪みを補正する第１歪み補正と、前記画像の左右方向及び上下方向の歪みを補正する第２歪み補正と、前記第２歪み補正とは異なる補正強度で前記画像の左右方向及び上下方向の歪みを補正する第３歪み補正と、の中から選択して行うように構成されている
    　ことを特徴とする請求項８に記載のインターホンシステム。     The image correction unit performs distortion correction performed on each of the plurality of regions in the distortion correction processing, and corrects distortion in the horizontal direction of the image according to an inclination angle of the mounting surface. Second distortion correction for correcting distortion in the horizontal direction and vertical direction of the image, and third distortion correction for correcting distortion in the horizontal direction and vertical direction of the image with a correction intensity different from that of the second distortion correction. The intercom system according to claim 8, wherein the intercom system is configured to be selected and performed.
  10. 　請求項１～９のいずれか１項に記載のインターホンシステムに用いられる
    　ことを特徴とするインターホン親機。     An intercom master unit used in the intercom system according to any one of claims 1 to 9.
  11. 　請求項１～９のいずれか１項に記載のインターホンシステムに用いられる
    　ことを特徴とするインターホン子機。     An intercom slave unit used in the intercom system according to any one of claims 1 to 9.
  12. 　コンピュータを、
    　請求項１～９のいずれか１項に記載のインターホンシステムにおける前記画像補正部として機能させるためのプログラム。     Computer
    The program for functioning as the image correction unit in the intercom system according to any one of claims 1 to 9.
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CN111008947A (en) * 2019-12-09 2020-04-14 Oppo广东移动通信有限公司 Image processing method and device, terminal device and storage medium
CN111008947B (en) * 2019-12-09 2024-05-07 Oppo广东移动通信有限公司 Image processing method and device, terminal equipment and storage medium
WO2022080737A1 (en) * 2020-10-14 2022-04-21 삼성전자 주식회사 Method for correcting image distortion, and electronic device therefor

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