JP2015028562A - Projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection device that easily acquires contrast information.SOLUTION: A projection device 1 includes a projection unit 20 that projects an image through a projection optical system 21, an imaging unit 10 that photographs a projection surface on which an image is projected by the projection unit 20, a distance measuring unit 13 that acquires information on the distance to the projection surface on the basis of contrast information obtained from an image of the projection surface photographed by the imaging unit 10 during the projection of a predetermined image by the projection unit 20, and an image determination unit 60 that determines the predetermined image on the basis of the image of the projection surface photographed by the imaging unit 10.

Description

  The present invention relates to a projection apparatus.

  A technique is known that automatically adjusts the focus of a projection lens while photographing a projection image by a projection device with a camera (see Patent Document 1).

Japanese Patent Laid-Open No. 2005-283952

  In the prior art, since the focus adjustment of the camera photographing lens and the focus adjustment of the projection lens are performed repeatedly, it is difficult to obtain contrast information.

  A projection device according to the present invention includes a projection unit that projects an image via a projection optical system, an imaging unit that captures a projection plane by the projection unit, and a projection plane that is captured by the imaging unit while the projection unit projects a predetermined image A distance measuring unit that obtains distance information to the projection plane based on contrast information obtained from the image of the image, and an image determination unit that determines a predetermined image based on the image of the projection plane captured by the imaging unit. It is characterized by that.

  In the projection apparatus according to the present invention, contrast information can be easily obtained.

It is a figure which illustrates the external appearance of the projector mounting camera by one embodiment of this invention. FIG. 2 is a block diagram illustrating a configuration of a projector-mounted camera in FIG. 1. FIG. 3A is a diagram illustrating a state in which the slit is retracted out of the projection optical path, and FIG. 3B is a diagram illustrating a state in which the slit is moved onto the projection optical path. It is a figure which illustrates a striped projection image. It is a flowchart which illustrates the flow of the autofocus process of the projection image which CPU performs. FIG. 6A is a diagram illustrating the signal value of each color component of the environment information, and FIG. 6B is a diagram in which the signal value of each color component is replaced. FIG. 7A is a diagram illustrating the signal value of each color component of the cyan image, and FIG. 7B is a diagram in which the signal value of each color component is replaced.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating the appearance of a projector-mounted camera 1 according to an embodiment of the invention. In FIG. 1, a photographing optical system 11, a projection optical system 21, and a slide lever 100 are provided in front of the projector-mounted camera 1. An operation member 80 is provided on the upper surface of the projector-mounted camera 1.

  The projector-equipped camera 1 has a projection function for projecting information such as an image from the projection optical system 21 onto a projection surface such as a screen, in addition to a photographing function for capturing a subject image through the photographing optical system 11.

  FIG. 2 is a block diagram illustrating the configuration of the projector-equipped camera 1 of FIG. The projector-equipped camera 1 includes a camera unit 10, a projector unit 20, an LCD monitor 30, a RAM 40, a flash memory 50, a CPU 60, a memory card interface (I / F) 70, and an operation member 80. . A removable memory card 90 is attached to the memory card interface (I / F) 70.

<Camera unit 10>
The camera unit 10 includes a photographing optical system 11, an image pickup device 12, an image pickup control unit 13, and an optical system driving unit 14. As the image sensor 12, a CMOS image sensor or the like is used. In response to an instruction from the CPU 60, the imaging control unit 13 controls driving of the imaging device 12 and the optical system driving unit 14 and performs predetermined image processing on the image signal read from the imaging device 12. Image processing includes gamma processing, interpolation processing, white balance adjustment processing, and the like.

  The imaging optical system 11 forms a subject image on the imaging surface of the imaging element 12. The imaging control unit 13 causes the imaging device 12 to start imaging in response to an imaging start instruction, and reads an image signal from the imaging device 12 after the imaging is completed. The imaging control unit 13 further performs image processing on the read image signal and sends the image data after the image processing to the CPU 60.

  The optical system driving unit 14 drives a focus lens (not shown) constituting the photographing optical system 11 forward and backward in the optical axis direction based on the focus adjustment signal output from the imaging control unit 13. Further, the optical system driving unit 14 advances and retracts a zoom lens (not shown) constituting the photographing optical system 11 in the optical axis direction (tele side or wide side) based on the zoom adjustment signal output from the imaging control unit 13. To drive.

<Focus adjustment>
The focus adjustment of the camera unit 10 is performed by moving a focus lens constituting the photographing optical system 11 in the optical axis direction. The imaging control unit 13 that performs autofocus adjustment includes an integrated value (a so-called value) of high frequency components included in an image signal corresponding to a predetermined focus detection area (for example, the center of the shooting screen) among the image signals captured by the image sensor 12. A focus adjustment signal is sent to the optical system drive unit 14 so as to maximize the focus evaluation value. The position of the focus lens that maximizes the focus evaluation value is a focus position that eliminates blurring of the edge of the subject image captured by the image sensor 12 and maximizes the contrast of the image.

  An example of focus evaluation value calculation (contrast detection) calculation performed during autofocus adjustment will be described. The imaging control unit 13 reads out, for each row, image signals corresponding to the focus detection area among the image signals captured by the imaging element 12, and calculates a difference between adjacent color components in the row. For example, in the case where R (red), G (green), and B (blue) color filters are Bayer-arranged on the imaging surface of the image sensor 12, the signals read for a given row are R1, G1, R2, G2, R3, G3, R4, G4, and so on. The imaging control unit 13 calculates the difference for the signal R1 = R1-R2, the difference for the signal R2 = R2-R3, the difference for the signal R3 = R3-R4,..., And the difference for the signal G1 = G1-G2 , The difference for the signal G2 = G2-G3, the difference for the signal G3 = G3-G4,.

  Further, the signals read for the rows adjacent to the predetermined row are denoted by g1, B1, g2, B2, g3, B3, g4, B4,. The imaging control unit 13 calculates the difference for the signal g1 = g1-g2, the difference for the signal g2 = g2-g3, the difference for the signal g3 = g3-g4,..., And the difference for the signal B1 = B1-B2 , The difference for the signal B2 = B2-B3, the difference for the signal B3 = B3-B4,. The imaging control unit 13 integrates the sum of all the differences calculated as described above, and defines this integrated value as contrast information.

<Zoom adjustment>
The zoom adjustment of the camera unit 10 is performed by moving the zoom lens constituting the photographing optical system 11 in the optical axis direction. The imaging control unit 13 that performs zoom adjustment sends a zoom adjustment signal to the optical system drive unit 14 in accordance with a zoom operation signal sent from a zoom switch (not shown) constituting the operation member 80 via the CPU 60.

<Projector unit 20>
The projector unit 20 includes a projection optical system 21, a liquid crystal panel 22, an LED light source 23, an optical system driving unit 24, a projection control unit 25, and a slit 26. The projection control unit 25 supplies a drive current to the LED light source 23 in response to a projection instruction from the CPU 60. The LED light source 23 illuminates the liquid crystal panel 22 with brightness according to the supplied current.

  The projection control unit 25 further generates a liquid crystal panel drive signal according to the image data sent from the CPU 60, and drives the liquid crystal panel 22 with the generated drive signal. Specifically, a voltage corresponding to the image signal is applied to the liquid crystal layer for each pixel. In the liquid crystal layer to which a voltage is applied, the arrangement of liquid crystal molecules changes, and the light transmittance of the liquid crystal layer changes. Thus, the liquid crystal panel 22 generates an optical image by modulating the light from the LED light source 23 in accordance with the image signal.

  Note that a configuration may be adopted in which a light image is generated by using a DMD (Digital Micromirror Device) as a modulation element instead of the liquid crystal panel 22. When the DMD is used, the DMD is illuminated in a time-sharing manner with R-color illumination light, G-color illumination light, and B-color illumination light. In the DMD, movable micro mirror surfaces (micro mirrors) corresponding to the pixels are two-dimensionally arranged. By driving the electrode provided on the micromirror, a state in which the illumination light is reflected toward the projection optical system 21 and a state in which the illumination light is reflected toward the internal absorber are switched. By individually driving each micromirror, the reflection of illumination light is controlled for each display pixel.

  As image data used for projection, image data read from the memory card 90, image data read from the flash memory 50, image data output from the camera unit 10, and the like can be used.

  The projection optical system 21 projects the light image emitted from the liquid crystal panel 22 onto a screen or the like. The optical system driving unit 24 drives the projection optical system 21 to advance and retreat in a direction orthogonal to the optical axis based on the offset adjustment signal output from the projection control unit 25. Further, the optical system driving unit 24 drives a focus lens (not shown) constituting the projection optical system 21 to advance and retreat in the optical axis direction based on the focus adjustment signal output from the projection control unit 25. The optical system drive unit 24 further drives the zoom lens (not shown) constituting the projection optical system 21 to advance and retreat in the optical axis direction based on the zoom adjustment signal output from the projection control unit 25.

  The slit 26 moves between a position on the projection optical path A of the projector unit 20 and a position outside the projection optical path A in conjunction with the operation of the slide lever 100 provided in front of the projector-mounted camera 1. The slide lever 100 is an operation member for moving the slit 26.

  If a grip member is provided at the lower part of the projection optical system 21 provided in front of the projector-equipped camera 1 so that the user can easily hold the projector-equipped camera 1, the grip member can be slid. The grip may also serve as a slide lever 100 for moving the slit 26.

  3A and 3B are diagrams for explaining the slide lever 100 and the slit 26. FIG. 3A is a diagram showing a state in which the slit 26 is retracted from the projection optical path A, and FIG. It is a figure which shows the state which moved to the top. The normal positions of the slide lever 100 and the slit 26 are the positions illustrated in FIG. When the user slides the slide lever 100 upward, the slit 26 connected to the slide lever 100 in the housing of the projector-equipped camera 1 moves upward and is inserted into the projection optical path A (FIG. 3 ( b)). When the slide lever 100 is slid downward by the user, the slit 26 also moves downward and retracts out of the projection optical path A (FIG. 3A).

<Offset of projected image>
The offset adjustment of the projection image is performed by shifting the projection optical system 21 in a direction orthogonal to the optical axis. By shifting the projection optical system 21, the emission direction of the light beam emitted from the projector unit 20 changes, and the projection image is offset. The offset of the projection image may be performed by shifting the projection optical system 21 and shifting the liquid crystal panel 22 and the LED light source 23 in the direction perpendicular to the optical axis.

<Keystone correction of projected images>
When a part of the projection optical system 21, the liquid crystal panel 22, and the LED light source 23 is shifted in the direction perpendicular to the optical axis, keystone correction is performed on the data to be projected in accordance with the shift amount. Since the projection image changes to a trapezoidal shape only by giving the offset to the projection image, the projection control unit 25 performs keystone correction by image processing to correct the projection image from the trapezoidal shape to the rectangular shape. The memory in the projection control unit 25 stores an initial correction value for correcting the projected image into a square shape in advance. The projection control unit 25 reads an initial correction value corresponding to the offset adjustment amount, performs a keystone correction process on the image data to be projected based on the read initial correction value, and based on the image data after the keystone correction process, the liquid crystal panel 22. Drive.

<Focus adjustment of projected image>
The focus adjustment of the projector unit 20 is performed by shifting the focus lens constituting the projection optical system 21 in the optical axis direction. The projection control unit 25 sends a focus adjustment signal to the optical system driving unit 24 in accordance with an instruction from the CPU 60. Details of the autofocus adjustment of the projected image will be described later.

<Zoom adjustment of projected image>
Zoom adjustment of the projector unit 20 is performed by moving the zoom lens constituting the projection optical system 21 in the optical axis direction. The projection control unit 25 that performs zoom adjustment sends a zoom adjustment signal to the optical system drive unit 24 in accordance with a zoom operation signal sent from the zoom switch (not shown) constituting the operation member 80 via the CPU 60.

  The LCD monitor 30 is constituted by a liquid crystal display panel, and displays an image, an operation menu screen, and the like according to an instruction from the CPU 60. The RAM 40 is used as a work memory for the CPU 60. The flash memory 50 stores a program to be executed by the CPU 60 and the like. The CPU 60 controls the operation of the projector-equipped camera 1 by executing a program stored in the flash memory 50.

  The memory card interface 70 has a connector (not shown), and the memory card 90 is connected to the connector. The memory card interface 70 writes data to the connected memory card 90 and reads data from the memory card 90. The memory card 90 is configured by a nonvolatile memory such as a flash memory.

  The operation member 80 includes a release button, a projection button, a mode switch, a zoom switch for the camera unit 10, a zoom switch for the projector unit 20, and the like. The operation member 80 sends an operation signal corresponding to each operation such as a release operation, a projection operation, and a mode switching operation to the CPU 60.

<Auto-focus adjustment of projected image>
For the autofocus adjustment of the projected image, first, as shown in FIG. 4, a slit image with an edge is projected from the projector unit 20, and the camera unit 10 that captures the slit image captures the autofocus of the photographing optical system 11. To do. Then, based on the distance information to the screen (or the wall) acquired by the auto focus adjustment of the camera unit 10, the focus lens constituting the projection optical system 21 is moved to a position corresponding to the distance information, so that the projector The unit 20 automatically focuses the projected image.

<Description of flowchart>
The flow of processing executed by the CPU 60 for adjusting the autofocus of the projected image by the projector unit 20 will be described with reference to the flowchart illustrated in FIG. The CPU 60 activates the process shown in FIG. 5 when the projector-mounted camera 1 is first switched to the projection mode after the power is turned on, for example. Switching to the projection mode is performed by operating a mode switch that constitutes the operation member 80. When the projector-mounted camera 1 is re-installed, the process shown in FIG. 5 may be started as appropriate to adjust the autofocus of the projected image.

  In step S <b> 101 of FIG. 5, the CPU 60 acquires environment information based on image data acquired by the camera unit 10. In this description, luminance information and color information of the screen (or wall) at the time of non-projection are referred to as environment information. The CPU 60 sends an instruction to the imaging control unit 13 of the camera unit 10 to repeatedly perform imaging of a screen (or wall) at a predetermined frame rate (for example, 60 fps), and based on image data sequentially output from the camera unit 10. The luminance information and color information of the screen (or wall) that is the projection destination of the projector unit 20 are acquired. Note that since the focus of the camera unit 10 when acquiring the environmental information may be rough, the position of the focus lens constituting the photographing optical system 11 is the initial position (for example, a position where the screen (or wall) is 3 m away from the focus). )

  In general, the brightness and color of the image projected by the projector unit 20 are easily affected by the brightness and color of the projection screen (or wall). For example, even if a white projection image is projected on a white screen, it is not noticeable, and even if a blue projection image is projected on a blue wall, it is not noticeable. The reason why the environment information is acquired in step S101 is to determine a focus adjustment image with brightness and hue that are conspicuous on the screen (or wall) of the projection destination.

  In step S102, the CPU 60 determines a projection image for focus adjustment. In the present embodiment, an image having uniform brightness and color within the projection screen is used as the focus adjustment image, and projection is performed through the slit 26 described above. As a result, as illustrated in FIG. 4, a striped projection image with an edge is obtained. In the example of FIG. 4, the focus adjustment image is configured with a uniform white color, and the portion blocked by the slit 26 is represented in black.

  The CPU 60 determines the brightness and color of the focus adjustment image based on the environmental information acquired in step S101 so that the fringes of the projected image are clear. In general, the image pickup device 12 is often configured such that R (red), G (green), and B (blue) color filters are Bayer arranged on the image pickup surface. Therefore, the signal value of the projection image for focus adjustment is determined for each of these color components. To make the projected image stripe clear, the difference between the luminance of the portion blocked by the slit 26 (that is, the screen (or wall) when not projected) and the luminance of the focus adjustment image, or the portion blocked by the slit 26. This corresponds to determining the brightness and color for increasing the difference between the color of the screen (or the screen (or wall) when not projected) and the color of the focus adjustment image. In this way, it is possible to project a focus adjustment image having a color and brightness different from those of the screen (or wall).

<Example focusing on luminance>
It can be said that the saturation is low when the ratio of the R component, G component, and B component of the image (environment information) acquired in step S101 is approximately 1: 1: 1. The CPU 60 may determine the focus adjustment image by paying attention to the luminance of the image (environment information) when the saturation is low. For example, when the signal value of an image is represented by 8 bits, the upper limit value of the signal value is 255 and the lower limit value is 0. When the signal value of each color component of the image (environment information) acquired in step S101 is larger than the intermediate value 127 between the upper limit value and the lower limit value, the CPU 60 adjusts the focus by replacing the signal value of that color component with the lower limit value 0. Image. When the above-described DMD is used as the modulation element in the projector unit 20, it is not necessary to drive the micromirror corresponding to the color component in which the signal value is replaced with the lower limit value 0 (that is, the color component that is not projected). Can be suppressed.

  On the contrary, when the signal value of each color component of the image (environment information) acquired in step S101 is smaller than the intermediate value 127 between the upper limit value and the lower limit value as illustrated in FIG. An image obtained by replacing the value with the upper limit value 255 is set as a focus adjustment image. FIG. 6B is a diagram illustrating a case where the signal values of the R component, the G component, and the B component are each replaced with the upper limit value 255. FIG. 4 is a diagram corresponding to a case where a high-luminance white image corresponding to FIG. 6B is projected as a focus adjustment image. When a white image with high luminance is projected onto a gray and low luminance screen (or wall), a luminance difference tends to appear between the screen (or wall) and the focus adjustment image (white image). That is, the contribution to the above-described focus evaluation value calculation (contrast detection) calculation can be increased.

<Example focusing on color>
It can be said that the saturation is high when the ratio of the R component, G component, and B component of the image (environment information) acquired in step S101 does not become approximately 1: 1: 1. The CPU 60 may determine the focus adjustment image by paying attention to the color of the image (environment information) when the saturation is high. Specifically, as illustrated in FIG. 7A, when the image (environment information) acquired in step S101 is a cyan image represented by a B component and a G component larger than the intermediate value 127, these B components The signal value of the G component is replaced with the lower limit value 0, and the signal value of the R component smaller than the intermediate value 127 in the image (environment information) acquired in step S101 is replaced with the upper limit value 255. Thereby, as illustrated in FIG. 7B, a focus adjustment image including only the R component is determined.

  Even if a cyan image is projected onto a cyan screen (or wall), the difference between the screen (or wall) and the focus adjustment image (R image) hardly appears. ) Small contribution to computation. Therefore, if an R image is projected without projecting the B component and the G component, a color difference tends to appear between the screen (or the wall) and the focus adjustment image (R image). That is, the contribution to the above-described focus evaluation value calculation (contrast detection) calculation can be increased. When the above-described DMD is used as the modulation element in the projector unit 20, it is not necessary to drive the micromirror corresponding to the color component in which the signal value is replaced with the lower limit value 0 (that is, the color component that is not projected), thereby saving power. .

  Further, as described above, in the imaging element 12 in which the color filters are arranged in the Bayer array, the number of G pixels is larger than that of the R pixels and the B pixels. For this reason, the G component should be included in the focus adjustment image as much as possible. For example, when the saturation of the screen (or wall) is low (the RGB component ratio is approximately 1: 1: 1), a color difference is likely to appear between the screen (or wall) and the focus adjustment image. May be determined as a focus adjustment image composed of only the R component, may be determined as a focus adjustment image composed of only the G component, or may be determined for focus adjustment composed of only the B component. The image may be determined. In the present embodiment, the G image in which the G component signal value is the upper limit value 255 and the R component and B component signal values are represented by the lower limit value 0 is the focus adjustment image. Accordingly, it is possible to easily detect a color difference between the screen (or the wall) and the focus adjustment image (G image) in the image sensor 12 having a large number of G pixels. That is, the contribution to the above-described focus evaluation value calculation (contrast detection) calculation can be increased. When the above-described DMD is used as the modulation element in the projector unit 20, it is not necessary to drive the micromirror corresponding to the color component in which the signal value is replaced with the lower limit value 0 (that is, the color component that is not projected), thereby saving power. . When the CPU 60 determines the signal value of the projection image for focus adjustment in this way, the process proceeds to step S103.

  In step S103, the CPU 60 sends an instruction to the projection control unit 25 of the projector unit 20, starts projection of the projection image for focus adjustment, and proceeds to step S104. In step S <b> 104, the CPU 60 determines whether the slit 26 has moved based on the image data acquired by the camera unit 10. If the stripe is detected based on the image data, the CPU 60 makes a positive determination in step S104 and proceeds to step S105. If the stripe is not detected based on the image data, the CPU 60 makes a negative determination in step S104. Wait for the slit 26 to move.

  In step S105, the CPU 60 sends an instruction to the imaging control unit 13 of the camera unit 10, performs contrast AF processing, and proceeds to step S106. Thereby, the focus lens of the photographing optical system 11 is moved to the in-focus position that maximizes the contrast of the image of the striped projection image acquired by the camera unit 10.

  In step S106, the CPU 60 calculates the subject distance from the projector-equipped camera 1 to the screen (or wall) based on the position of the focus lens of the photographing optical system 11, and proceeds to step S107. Data indicating the relationship between the position of the focus lens of the photographing optical system 11 and the subject distance to the screen (or wall) is stored in the flash memory 50 in advance.

  In step S107, the CPU 60 sends an instruction to the projection control unit 25 of the projector unit 20, moves the position of the focus lens constituting the projection optical system 21 to a position corresponding to the subject distance, and proceeds to step S108. Data indicating the relationship between the position of the focus lens of the projection optical system 21 and the subject distance is stored in the flash memory 50 in advance.

  In step S108, the CPU 60 sends an instruction to the projection control unit 25 of the projector unit 20, ends the projection of the projection image for focus adjustment, and ends the processing in FIG. The CPU 60 sends an instruction to the imaging control unit 13 of the camera unit 10 and ends imaging at the frame rate (for example, 60 fps). The CPU 60 performs a predetermined projection process after the process of FIG.

According to the embodiment described above, the following operational effects can be obtained.
(1) The projector-equipped camera 1 includes a projector unit 20 that projects an image via the projection optical system 21, a camera unit 10 that captures a projection surface of the projector unit 20, and the projector unit 20 that is projecting an image for focus adjustment. Based on the focus evaluation value obtained from the image of the projection plane imaged by the camera unit 10, the imaging control unit 13 that acquires subject distance information to the projection plane, and the image of the projection plane imaged by the camera unit 10 On the basis of this, the CPU 60 for determining the focus adjustment image is provided, so that contrast information can be obtained more easily than in the prior art.

(2) Since the CPU 60 determines the focus adjustment image based on the image of the projection plane captured by the camera unit 10 when the projector unit 20 is not projecting the focus adjustment image, the brightness of the screen (or wall) is determined. Alternatively, a focus adjustment image corresponding to the color can be determined.

(3) Since the CPU 60 that causes the projector unit 20 to adjust the focus of the projection optical system 21 based on the subject distance information acquired by the imaging control unit 13 is provided, the focus adjustment of the projection optical system 21 is performed as in the prior art. There is no need to repeat the focus adjustment time.

(4) The CPU 60 displays the color information of the image of the projection plane captured by the camera unit 10 during non-projection and the image of the projection plane acquired by the camera unit 10 when the projector unit 20 projects the focus adjustment image. Since the color or brightness of the focus adjustment image is determined so that the difference from the color information becomes large, the focus evaluation value can be acquired based on high contrast. As a result, the accuracy of the obtained subject distance information is increased, so that the accuracy of focus adjustment is improved. In addition, since the focus evaluation value acquisition time in the camera unit 10 is shortened, the overall focus adjustment time can also be shortened.

(5) The CPU 60 replaces the image signal value with the lower limit value when the image signal value is larger than the intermediate value between the upper limit value and the lower limit value for each color component of the image of the projection plane captured by the camera unit 10 during non-projection. Since the image signal value is replaced with the upper limit value when the image signal value is smaller than the intermediate value, the contrast necessary for obtaining the focus evaluation value in the camera unit 10 can be appropriately increased.

(6) Since the slit 26 for dividing the focus adjustment image projected by the projector unit 20 is provided in a striped pattern, a slit image with an edge is projected before the focus adjustment of the projection optical system 21 is performed. be able to.

(7) The imaging control unit 13 is based on the focus evaluation value obtained from the image of the projection plane imaged by the camera unit 10 when the focus adjustment image projected from the projector unit 20 is divided by the slit 26. The object distance information to the projection plane was acquired. Since the slit image with the raised edge has a contrast suitable for obtaining the focus evaluation value, the subject distance information can be appropriately obtained.

(8) Since the slit 26 is configured to be movable between the projection light path A and the outside of the projection light path A by the projector unit 20, a case where a slit image with an edge raised is projected and a normal projection are performed. The case can be switched with a simple configuration.

(Modification 1)
In the above description, the case where the image sensor 12 is provided with a primary color filter is described, but the present invention can also be applied to the case where a complementary color filter is provided on the image sensor 12.

(Modification 2)
In the above description, the projector-mounted camera 1 has been described as an example. However, as long as the camera function and the projector function are provided, other electronic devices perform automatic focus adjustment of the projection optical system as in the present embodiment. be able to.

(Modification 3)
The movement of the slit 26 may be configured to move using an actuator instead of interlocking with the movement of the slide lever 100 described above.

  The above description is merely an example, and is not limited to the configuration of the above embodiment.

DESCRIPTION OF SYMBOLS 1 ... Projector mounted camera 10 ... Camera unit 11 ... Shooting optical system 13 ... Imaging control part 20 ... Projector unit 21 ... Projection optical system 25 ... Projection control part 26 ... Slit 60 ... CPU
80 ... Operation member 100 ... Slide lever

Claims (8)

A projection unit that projects an image via a projection optical system;
An imaging unit for imaging a projection plane by the projection unit;
A distance measuring unit that acquires distance information to the projection surface based on contrast information obtained from an image of the projection surface captured by the imaging unit while the projection unit projects a predetermined image;
An image determination unit that determines the predetermined image based on an image of the projection plane captured by the imaging unit;
A projection apparatus comprising: The projection device according to claim 1,
The projection apparatus, wherein the image determination unit determines the predetermined image based on an image of the projection plane captured by the imaging unit when the projection unit is not projecting the predetermined image. The projection apparatus according to claim 2, wherein
A projection apparatus comprising: a control unit that performs focus adjustment of the projection optical system based on the distance information acquired by the distance measuring unit. The projection device according to claim 2 or 3,
The image determination unit includes color information of an image of the projection plane captured by the imaging unit when the projection unit is not projecting the predetermined image, and the image capturing unit while the projection unit is projecting the predetermined image. A projection apparatus, wherein the color or brightness of the predetermined image is determined so that a difference from the color information of the image of the projection plane captured by a unit becomes large. In the projection apparatus as described in any one of Claims 2-4,
The image determination unit has an image signal value that is an intermediate value between an upper limit value and a lower limit value for each color component of the image of the projection plane captured by the imaging unit when the projection unit is not projecting the predetermined image. The projection apparatus, wherein when larger, the image signal value is replaced with the lower limit value, and when the image signal value is smaller than the intermediate value, the image signal value is replaced with the upper limit value. In the projection apparatus as described in any one of Claims 2-5,
A projection apparatus comprising: a slit member that divides the predetermined image projected by the projection unit into stripes. The projection apparatus according to claim 6, wherein
The ranging unit is configured to project the projection based on contrast information obtained from an image of the projection plane captured by the imaging unit when the predetermined image projected from the projection unit is divided by the slit member. A projection apparatus characterized by acquiring distance information to a surface. The projection device according to claim 6 or 7,
The projection apparatus, wherein the slit member is configured to be movable between a projection optical path by the projection unit and outside the projection optical path.

Images