Control device, projection device, and projection system

Abstract

The present invention provides a control device, projection device, and projection system that can effectively remove speckle noise while reducing power consumption. [Solution] The control device 7 controls a light source unit 2 that emits laser light, a display unit 6 that receives the laser light emitted from the light source unit 2, displays an image G, and projects a projection image corresponding to the image G onto a projection surface, and a rotating diffusion unit 3 that performs a despeckle operation to remove speckle noise from the projection image. The control device 7 includes an image data acquisition unit 7a that acquires image data D of the projection image, and an adjustment unit 7c that adjusts the intensity of the despeckle operation according to the image data D acquired by the image data acquisition unit 7a.

Description

Technical Field

[0001] The present disclosure relates to a control device, a projection device, and a projection system.

Background Art

[0002] The projector described in Patent Document 1 includes a light diffusion member provided on a laser optical path and a motor that rotates a light diffusion plate so as to temporally change the diffusion state of the laser light. Thus, since the light diffusion plate is rotated by the motor, speckle noise is reduced by multiplexing of the laser light.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration described in Patent Document 1 above, although the power consumption of the motor can be suppressed by reducing the rotation speed of the light diffusion plate, there is a possibility that the removal of speckle noise is not sufficient. On the other hand, although speckle noise can be easily removed by increasing the rotation speed of the light diffusion plate, the power consumption of the motor increases.

[0005] The present disclosure has been made in view of the above actual situation, and an object thereof is to provide a control device, a projection device, and a projection system that can effectively remove speckle noise while suppressing power consumption.

Means for Solving the Problems

[0006] To achieve the above object, a control device according to a first aspect of the present disclosure is A control device for controlling a light source unit that emits laser light, a display unit that receives the laser light emitted from the light source unit, displays an image, and projects a projection image corresponding to the image onto a projection surface, and a despeckle means that performs a despeckle operation to remove speckle noise from the projection image, A video data acquisition unit acquires video data of the projected image, The system includes an adjustment unit that adjusts the intensity of the despeckle operation according to the video data acquired by the video data acquisition unit.

[0007] To achieve the above objectives, the control device relating to the second aspect of this disclosure is: A control device for controlling a light source unit that emits laser light, a display unit that receives the laser light emitted from the light source unit, displays an image, and projects a projection image corresponding to the image onto a projection surface, and a despeckle means that performs a despeckle operation to remove speckle noise from the projection image, The system includes an adjustment unit that adjusts the intensity of the despeckle operation according to the image displayed on the display unit.

[0008] To achieve the above objectives, the projection device relating to the third aspect of this disclosure is A projection device that projects a projected image onto a projection surface, The control device and, The light source unit, The display unit and, The device comprises the aforementioned despeckling means.

[0009] To achieve the above objectives, the projection system relating to the fourth aspect of this disclosure is: The projection device mounted on the vehicle, The system includes a camera that captures the projected image and outputs the video data.

[0010] To achieve the above objectives, the control device relating to the fifth aspect of this disclosure is: A control device that controls a light source unit that emits laser light, a display unit that receives the laser light emitted from the light source unit, displays an image, and projects a projection image corresponding to the image onto a projection surface that can replace the projection image, and a despeckle unit that performs a despeckle operation to remove the speckle noise of the projection image. An acquisition unit that acquires projection surface information representing the current state of the projection surface. It includes an adjustment unit that adjusts the intensity of the despeckle operation according to the projection surface information.

Advantages of the Invention

[0011] According to the present disclosure, speckle noise can be effectively removed while suppressing power consumption.

Brief Description of the Drawings

[0012] [Figure 1] It is a schematic diagram of a vehicle according to the first embodiment of the present disclosure. [Figure 2] It is a schematic diagram of a projection device according to the first embodiment of the present disclosure. [Figure 3] It is a schematic diagram of a projection image including speckle noise according to the first embodiment of the present disclosure. [Figure 4] It is a graph showing the change in the video signal level in the X direction of a part of the video according to the first embodiment of the present disclosure. [Figure 5] It is a schematic diagram of a projection image without speckle noise according to the first embodiment of the present disclosure. [Figure 6] It is a flowchart of the despeckle process according to the first embodiment of the present disclosure. [Figure 7] It is a graph showing the temporal change in the rotation speed of the rotating diffuser plate according to the first embodiment of the present disclosure. [Figure 8] It is a schematic diagram of a vehicle according to the second embodiment of the present disclosure. [Figure 9] It is a schematic diagram of a data table showing the optimal rotation speed corresponding to the type of screen and the type of display image according to the second embodiment of the present disclosure.

Modes for Carrying Out the Invention

[0013] (First Embodiment) A control device, a projection device, and a projection system according to a first embodiment of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, a projection system 8 is mounted on a vehicle 200. The projection system 8 includes a projection device 1 and a camera 9 that captures a projected image Pi.

[0014] The projection device 1 projects a projected image Pi onto a projection surface C by irradiating the projection surface C with display light L. The projection surface C is an object outside the vehicle 200, for example, a road surface or a wall surface. Note that the projection surface C is not limited to an object outside the vehicle 200, and may be a vehicle body, a vehicle interior, a screen, a windshield, or a combiner. When the projection surface C is a windshield or a combiner, the projection device 1 is configured as a head-up display device.

[0015] The camera 9 captures the projected image Pi projected by the projection device 1 under the control of the control device 7 and outputs the captured video data D to the control device 7 by being synchronized with the projection device 1.

[0016] As shown in FIG. 2, the projection device 1 includes a light source unit 2, a rotary diffusion unit 3, a lens group 4, a diffusion plate 5, a display unit 6, and a control device 7.

[0017] The light source unit 2 includes a laser light source 2a that emits laser light (red laser light R, green laser light G, blue laser light B) and a light combining unit 2b that combines each laser light R, G, B from the light source unit 2. The light combining unit 2b is composed of a plurality of dichroic mirrors.

[0018] The rotary diffusion unit 3 is a despeckle means that performs a despeckle operation for removing speckle noise of the projected image Pi. The rotary diffusion unit 3 includes a disk-shaped rotary diffusion plate 31 and a motor 32 that rotates the rotary diffusion plate 31 about the center of the circle of the rotary diffusion plate 31 as a rotation axis. The motor 32 is driven under the control of the control device 7, causing the rotating diffuser plate 31 to rotate around its axis of rotation.

[0019] The rotating diffuser plate 31 is provided on the optical path of the laser light between the light source unit 2 and the lens group 4. The rotating diffuser plate 31 has an incident surface into which the combined laser light R, G, B from the light source unit 2 is incident, and an exit surface into which the laser light R, G, B incident from the incident surface is emitted. At least one of the incident surface and the exit surface of the rotating diffuser plate 31 has an uneven pattern formed thereon, which includes numerous bumps and dips.

[0020] When the rotating diffuser plate 31 is rotating by the motor 32, the laser light is multiplexed, resulting in a reduction of speckle noise. Furthermore, increasing the rotation speed of the rotating diffuser plate 31 per unit time (hereinafter simply referred to as the rotation speed of the rotating diffuser plate 31) increases the number of times the laser light crosses the irregularities, thereby increasing the number of multiplexing operations and enhancing the speckle noise reduction effect. Increasing the rotation speed of the rotating diffuser plate 31 increases the intensity of the despeckle action as a despeckle means, while decreasing the rotation speed of the rotating diffuser plate 31 decreases the intensity of the despeckle action as a despeckle means.

[0021] Lens group 4 is positioned in the laser beam path between the rotating diffuser plate 31 and the diffuser plate 5, and refracts the laser beam that has passed through the rotating diffuser plate 31 to align with the display unit 6. Lens group 4 comprises a collimating lens 41, a fly-eye lens 42, a condenser lens 43, and a field lens 44. Note that the configuration of lens group 4 is not limited to this combination and can be changed as appropriate.

[0022] The diffuser plate 5 is located in the laser beam path between the lens group 4 and the display unit 6, and diffuses the laser beam that has passed through the lens group 4.

[0023] The display unit 6 displays an image G corresponding to the projected image Pi under the control of the control device 7. When displaying the image G, the display unit 6 emits display light L when it receives laser light that has passed through the diffuser plate 5 as a backlight. The display unit 6 is a TFT (Thin Film Transistor) type liquid crystal panel. Furthermore, the display unit 6 is not limited to using a liquid crystal panel, as long as it is configured to receive laser light and emit display light L, it may also use a MEMS (Micro Electro Mechanical System) method using a micromirror device, an LCOS (Registered Trademark: Liquid Crystal On Silicon) method using a reflective liquid crystal panel, or a scanning method using a galvanometer mirror.

[0024] The control device 7 controls the projection system 8. The control device 7 consists of a CPU (Central Processing Unit), a GDC (Graphics Display Controller), ROM (Read Only Memory), RAM (Random Access Memory), and other components.

[0025] The control device 7 comprises, as functional blocks, a video data acquisition unit 7a, a speckle extraction unit 7b, an adjustment unit 7c, and a display processing unit 7d. The video data acquisition unit 7a acquires video data D from the camera 9. The display processing unit 7d performs the process of displaying the image G on the display unit 6.

[0026] The speckle extraction unit 7b extracts speckle contrast from the acquired video data D. The speckle contrast extraction method is described below. First, as shown in Figures 3 and 4, the speckle extraction unit 7b acquires the video signal level in a predetermined direction (X direction) in a portion Pd of the acquired video data D, and calculates the standard deviation σ as the degree of variation in this video signal level. Part Pd of the image is a portion of the projected image Pi captured by camera 9, and is the background portion of the projected image Pi, not the displayed content itself. The background portion has speckle noise superimposed on a constant brightness. Part Pd of the image is, for example, a portion corresponding to a corner of the projected image Pi.

[0027] Furthermore, the speckle extraction unit 7b acquires the average signal level Ave of a portion Pe (see Figure 5) of the original image corresponding to the video of the video data D from which the video signal level has been acquired. The portion Pe of the original image corresponds to a region Pd of the video, and in this portion Pe, no display content is shown, the brightness is constant, and no speckle noise is superimposed. Then, the speckle extraction unit 7b extracts the speckle contrast Cs from the acquired average signal level Ave and standard deviation σ using the following formula. Cs = σ / Ave The smaller the speckle contrast Cs, the less speckle noise there is. Conversely, the larger the speckle contrast Cs, the more speckle noise there is.

[0028] The adjustment unit 7c increases or decreases the rotational speed of the motor 32, i.e., the rotational speed of the rotating diffuser plate 31, in order to adjust the intensity of the despeckling action. The adjustment unit 7c sets the rotational speed of the motor 32 to the desired rotational speed by performing feedback control over the rotational speed of the motor 32.

[0029] The despeckle processing performed by the control device 7 will be explained with reference to the flowchart in Figure 6. This despeckle processing is performed when the projection of the projected image Pi by the projection device 1 begins. First, the adjustment unit 7c increases the rotation speed of the rotating diffuser plate 31 via the motor 32, targeting a preset lower limit rotation speed Rmin, as shown in the startup period T1 in Figure 7 (step S1).

[0030] Next, the video data acquisition unit 7a acquires video data D from the camera 9 after the rotation speed of the rotating diffuser plate 31 reaches the lower limit rotation speed Rmin (step S2). Then, as described above, the speckle extraction unit 7b extracts the speckle contrast Cs based on the video data D (step S3). The adjustment unit 7c determines whether the extracted speckle contrast Cs is less than the threshold Th (step S4). The threshold Th is set, for example, to 4-10%, which is the target reduction level for the speckle contrast Cs. If the adjustment unit 7c determines that the speckle contrast Cs exceeds the threshold Th (step S4; NO), it determines that the despeckle intensity is insufficient and increases the rotation speed of the rotating diffuser plate 31 as shown at time t1 in Figure 7 (step S5). If the adjustment unit 7c determines that the speckle contrast Cs is less than the threshold Th (step S4; YES), it determines that the despeckle intensity is excessive and reduces the rotation speed of the rotating diffuser plate 31 as shown at time t2 in Figure 7 (step S6).

[0031] After step S5 or S6 described above, the adjustment unit 7c determines whether the rotational speed of the rotating diffuser plate 31 has reached the upper limit rotational speed Rmax or the lower limit rotational speed Rmin (step S7). If the adjustment unit 7c determines that the rotational speed of the rotating diffuser plate 31 has not reached the upper limit rotational speed Rmax or the lower limit rotational speed Rmin (step S7; NO), it returns to the process of step S2. When the rotational speed of the rotating diffuser plate 31 is between the upper limit rotational speed Rmax and the lower limit rotational speed Rmin, steps S2 to S7 are repeated to maintain the rotational speed of the rotating diffuser plate 31 near the optimal rotational speed Rh (see Figure 7) corresponding to the threshold Th.

[0032] When the adjustment unit 7c determines that the rotational speed of the rotating diffuser plate 31 has reached the upper limit rotational speed Rmax or the lower limit rotational speed Rmin (step S7; YES), it terminates the despeckle process while maintaining the rotational speed of the rotating diffuser plate 31 at the upper limit rotational speed Rmax or the lower limit rotational speed Rmin. The lower limit rotational speed Rmin is set to the minimum value within the range in which the speckle contrast Cs can be changed by increasing or decreasing the rotational speed of the rotating diffuser plate 31. In other words, at rotational speeds below the lower limit rotational speed Rmin, the speckle contrast Cs does not change even if the rotational speed is changed. The upper limit rotational speed Rmax is the rotational speed at which the maximum speckle noise among the expected speckle noises can be removed. The above despeckle processing can be modified as appropriate. For example, the adjustment unit 7c may maintain the rotation speed of the rotating diffuser plate 31 when the speckle contrast Cs is within the normal range including the threshold Th, decrease the rotation speed of the rotating diffuser plate 31 when the speckle contrast Cs is below the normal range, and increase the rotation speed of the rotating diffuser plate 31 when the speckle contrast Cs is above the normal range. The normal range is set to, for example, 4 to 10%. Furthermore, the upper limit rotational speed Rmax or the lower limit rotational speed Rmin may be omitted.

[0033] (effect) The first embodiment described above provides the following effects. (1) The control device 7 controls a light source unit 2 that emits laser light, a display unit 6 that receives the laser light emitted from the light source unit 2, displays an image G, and projects a projected image Pi corresponding to the image G onto a projection surface C, and a rotating diffusion unit 3 which is an example of a despeckle means that performs a despeckle operation to remove speckle noise from the projected image Pi. The control device 7 includes an image data acquisition unit 7a that acquires image data D of the projected image Pi, and an adjustment unit 7c that adjusts the intensity of the despeckle operation according to the image data D acquired by the image data acquisition unit 7a. With this configuration, the intensity of the despeckle operation is adjusted by the adjustment unit 7c, so any excess or deficiency in the intensity of the despeckle operation is reduced, and speckle noise can be effectively removed while suppressing power consumption.

[0034] (2) The adjustment unit 7c maintains the rotation speed of the rotating diffuser plate 31 at an intensity equal to or greater than the lower limit rotation speed Rmin, which is an example of the lower limit of the range in which speckle noise can be reduced. This configuration allows for quick adjustment of the intensity of the despeckle movement by the adjustment unit 7c.

[0035] (3) The rotating diffusion unit 3 comprises a rotating diffusion plate 31 and a motor 32, which is an example of a drive unit for rotating the rotating diffusion plate 31. The intensity of the despeckle action is the number of rotations per unit time of the rotating diffusion plate 31. The higher the rotation speed, the stronger the despeckle action. This configuration allows for effective removal of speckle noise while keeping power consumption low.

[0036] (4) The projection device 1 that projects the projected image Pi onto the projection surface C comprises a control device 7, a light source unit 2, a display unit 6, and a rotating diffusion unit 3. This configuration allows for effective removal of speckle noise while keeping power consumption low.

[0037] (5) The projection device 1 is mounted on a vehicle 200, which is an example of a mobile body, and projects a projection image Pi onto a projection surface C, which is part of an object outside the vehicle 200. In this configuration, the projection plane C changes depending on the position of the vehicle 200, so the state of the projection plane C is not always the same. Even in this case, the intensity of the despeckle action can always be adjusted to match the shape of the projection plane C.

[0038] (6) The projection system 8 comprises a projection device 1 mounted on the vehicle 200 and a camera 9 that captures the projected image Pi and outputs video data D. This configuration allows for effective removal of speckle noise while keeping power consumption low.

[0039] (Second Embodiment) A control device, projection device, and projection system according to the second embodiment of this disclosure will be described with reference to the drawings. This embodiment differs from the first embodiment in that a camera is omitted and speckle contrast is not extracted based on video data. In this embodiment, as shown in Figure 8, the rotation speed of the rotating diffuser plate 31 corresponding to the speckle contrast Cs is obtained based on the data Dt stored in the memory 7m of the control device 7, and the rotation speed of the rotating diffuser plate 31 is adjusted to the obtained rotation speed.

[0040] As shown in Figure 9, data Dt is a data table that associates the optimal rotation speeds c1, c2, etc. of the rotating diffuser plate 31 with the types a1, a2, etc. of the screen (projection surface C) and the types b1, b2, etc. of the displayed image G. The optimal rotation speeds c1, c2, etc. of the rotating diffuser plate 31 are set between the upper limit rotation speed Rmax and the lower limit rotation speed Rmin. Data Dt is created by experiment or simulation. The types of screens (projection surface C) a1 and a2 are the road surface, dashboard, or vehicle body, etc.

[0041] The flatter the screen (projection surface C), the greater the speckle noise and speckle contrast Cs tend to be, so the optimal rotation speeds c1, c2… are set higher. On the other hand, the more uneven the screen (projection surface C) is (for example, the rougher the surface), the smaller the speckle noise and speckle contrast Cs tend to be, so the optimal rotation speeds c1, c2… are set lower. Furthermore, for the displayed image G, the brighter the background color, the greater the speckle noise and speckle contrast Cs tend to be, so the optimal rotation speeds c1, c2… are set higher. On the other hand, for the displayed image G, the darker the background color, the less speckle noise and speckle contrast Cs tend to be, so the optimal rotation speeds c1, c2… are set lower.

[0042] The types a1, a2, etc. of the screen (projection surface C) are determined to be one of them when the projection device 1 is manufactured. When projecting the projection image Pi, the adjustment unit 7c identifies which of the display image G types b1, b2, etc. in the data Dt corresponds to the projection image Pi. Based on the determined screen (projection surface C) types a1, a2, etc. and the identified display image G types b1, b2, etc., the adjustment unit 7c determines the optimal rotation speeds c1, c2, etc. from the data Dt and rotates the rotating diffuser plate 31 at these determined optimal rotation speeds c1, c2, etc. This provides the same effects as in the first embodiment described above.

[0043] (effect) The second embodiment described above provides the following effects. (1) The control device 7 controls a light source unit 2 that emits laser light, a display unit 6 that receives the laser light emitted from the light source unit 2, displays an image G, and projects a projected image Pi corresponding to the image G onto the projection surface C, and a rotating diffusion unit 3 which is an example of a despeckle means that performs a despeckle operation to remove speckle noise from the projected image Pi. The control device 7 includes an adjustment unit 7c that adjusts the intensity of the despeckle operation according to the image G displayed on the display unit 6. With this configuration, the intensity of the despeckle operation is adjusted by the adjustment unit 7c, so any excess or deficiency in the intensity of the despeckle operation is reduced, and speckle noise can be effectively removed while suppressing power consumption. In particular, with this configuration, the optimal rotation speeds c1, c2, etc. are determined from the data Dt, eliminating the need for a camera and allowing for effective removal of speckle noise with a simpler setup.

[0044] (2) The control device 7 controls a light source unit 2 that emits laser light, a display unit 6 that receives the laser light emitted from the light source unit 2, displays an image G, and projects a projection image Pi corresponding to the image G onto a projection surface C such as a road surface that can be replaced, and a rotating diffusion unit 3 that performs a despeckle operation to remove speckle noise from the projection image Pi. The control device 7 includes an adjustment unit 7c that acquires projection surface information (screen types a1, a2) representing the current state of the projection surface C, and an adjustment unit 7c that adjusts the intensity of the despeckle operation (rotation speed of the rotating diffusion plate 31) according to the screen types a1, a2. This configuration allows for adjustment of the despeckle action intensity to match the projection plane information.

[0045] This disclosure is not limited to the embodiments and drawings described above. Modifications (including the deletion of components) can be made as appropriate, provided they do not alter the essence of this disclosure. An example of such a modification is described below.

[0046] (modified version) In the second embodiment described above, either the screen type a1, a2… or the display image G type b1, b2… from the data Dt may be omitted. In this case, the adjustment unit 7c determines the optimal rotation speed c1, c2… from either of these and rotates the rotating diffuser plate 31 to the determined optimal rotation speed c1, c2…. Furthermore, in the second embodiment described above, the optimal rotation speeds c1 and c2 may be determined not only from a data table, but also from either the screen types a1, a2… or the display image G types b1, b2… using a mathematical formula.

[0047] In the first embodiment described above, the speckle extraction unit 7b may acquire information (video signal level) of at least one of the colors other than blue, for example, red and green, from a part Pd of the acquired video data D, calculate the standard deviation σ as the degree of variation of this video signal level, and thereby calculate the speckle contrast Cs. Here, speckle noise is less visible to the human eye in blue images than in red or green images. Therefore, even if the speckle contrast Cs is extracted to match a blue image and the rotation speed of the rotating diffuser plate 31 is adjusted, speckle noise is still noticeable in red or green images. In this respect, by extracting the speckle contrast Cs to match at least one of the red and green images, which are more easily visible to the human eye, and adjusting the rotation speed of the rotating diffuser plate 31, speckle noise can be reduced to an invisible level even in blue images.

[0048] In each of the above embodiments, the projection device 1 may be configured to include a screen having a projection surface C. This allows the intensity of the despeckle action to be adjusted to match the screen. This screen has an irreplaceable projection surface C. In each of the above embodiments, a vibrating diffuser may be provided instead of the rotating diffuser 31. In this case, the despeckling means comprises, for example, this vibrating diffuser and a vibrator that vibrates this vibrating diffuser. The higher the vibration frequency (frequency per unit time) of this vibrating diffuser, the stronger the despeckling operation. Furthermore, the despeckling means is not limited to this and may include a light source vibrator that vibrates the light source unit 2. The higher the vibration frequency of the light source unit 2, the stronger the despeckling operation.

[0049] In the first embodiment described above, the speckle extraction unit 7b acquired the video signal level in a predetermined direction (X direction) in a part Pd of the video, but it may also acquire the video signal level in a predetermined direction (X direction) of the entire video. Alternatively, the speckle extraction unit 7b may acquire the video signal level in a direction perpendicular to the X direction. In each of the above embodiments, the light source unit 2 may emit monochromatic laser light.

[0050] In each of the above embodiments, the despeckle processing shown in Figure 6 was performed at the start of projection of the projected image Pi by the projection device 1, but it is not limited to this and may be performed repeatedly during the projection of the projected image Pi. In each of the above embodiments, the moving object is not limited to a vehicle 200, but may be a ship or an airplane, etc. In the first embodiment described above, a three-dimensional scanner may be provided instead of the camera 9, and the shape of the projection surface C may be scanned by this three-dimensional scanner, and the intensity of the despeckle operation may be adjusted according to the scanned shape of the projection surface C. [Explanation of Symbols]

[0051] 1...Projection device 2...Light source section, 2a...Laser light source, 2b...Photosynthesis section 3...Rotating diffusion unit, 31...Rotating diffusion plate, 32...Motor 4...Lens group, 41...Collimating lens, 42...Fly-eye lens, 43...Condenser lens, 44...Field lens 5…Diffuser 6…Display section 7...Control device, 7a...Video data acquisition unit, 7b...Speckle extraction unit, 7c...Adjustment unit, 7d...Display processing unit, 7m...Memory 8…Projection system 9... Camera 200...vehicles R, G, B…Laser light, C…Projection surface, D…Video data, G…Image, L…Display light, T1…Startup period, a1, a2…Screen type, b1, b2…Display image type, c1, c2…Optimal rotation speed, t1, t2…Time, Cs…Speckle contrast, Dt…Data, Pi…Projected image, Th…Threshold, Ave…Average signal level, Rmin…Lower rotation speed, Rmax…Upper rotation speed

Claims

1. A control device for controlling a light source unit that emits laser light, a display unit that receives the laser light emitted from the light source unit, displays an image, and projects a projection image corresponding to the image onto a projection surface, and a despeckle means that performs a despeckle operation to remove speckle noise from the projection image, A video data acquisition unit acquires video data of the projected image, The system includes an adjustment unit that adjusts the intensity of the despeckle operation according to the video data acquired by the video data acquisition unit. Control device.

2. A control device for controlling a light source unit that emits laser light, a display unit that receives the laser light emitted from the light source unit, displays an image, and projects a projection image corresponding to the image onto a projection surface, and a despeckle means that performs a despeckle operation to remove speckle noise from the projection image, The display unit includes an adjustment unit that adjusts the intensity of the despeckle operation according to the image displayed on the display unit. Control device.

3. The adjustment unit maintains the intensity above a lower limit that can reduce the speckle noise. The control device according to claim 1 or 2.

4. The aforementioned despeckling means is A rotating diffuser, a vibrating diffuser, or a light source vibrator, The system includes a drive unit that rotates the rotating diffuser plate or vibrates the vibrating diffuser plate or the light source vibrator, The intensity is the rotational speed or vibration frequency per unit time of the rotating diffuser, the vibrating diffuser, or the light source vibrator. The higher the rotational speed or vibration frequency, the higher the intensity. The control device according to claim 1 or 2.

5. The adjustment unit adjusts the intensity of the despeckle operation based on information from either the red or green color of the video data, or both. The control device according to claim 1.

6. A projection device that projects a projected image onto a projection surface, A control device according to claim 1 or 2, The light source unit, The display unit and, The despeckling means is provided, Projection device.

7. The projection device is mounted on a moving body and projects the projection image onto the projection surface which is part of an object outside the moving body. The projection apparatus according to claim 6.

8. The projection device comprises a screen having the projection surface, The projection apparatus according to claim 6.

9. A projection device according to claim 6, which is mounted on a vehicle, The system includes a camera that captures the projected image and outputs the video data, A projection system.

10. A control device for controlling a light source unit that emits laser light, a display unit that receives the laser light emitted from the light source unit, displays an image, and projects a projection image corresponding to the image onto a replaceable projection surface, and a despeckle means that performs a despeckle operation to remove speckle noise from the projection image, An acquisition unit that acquires projection surface information representing the current state of the projection surface, The system includes an adjustment unit that adjusts the intensity of the despeckle movement according to the projection surface information. Control device.

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