JP2020178166A - Projection control device, projection control method, and program - Google Patents

Abstract

To improve visibility of a projected image projected on a to-be-projected object according to a movement of the to-be-projected object.SOLUTION: A projection control device includes reception means for receiving projection object information regarding at least one of a movement speed of the projection object or a distance between the projection object and a projection device from an imaging apparatus for capturing a projection object onto which an image is projected by the projection device and obtaining at least one of the movement speed or the distance, from the projection target information, and control determination means for determining a control value of image processing for the projected image by the projection device according to at least one of the movement speed or the distance.SELECTED DRAWING: Figure 1

Description

The present invention relates to a projection control device, a projection control method and a program relating to the control of projection on a projection object.

In recent years, projection mapping, which projects images onto buildings, has attracted attention, and opportunities for use at events are increasing. Projection mapping realizes spatial augmented reality by combining an actual object and an image, and has already been put into practical use.

Further, a technique for projecting an image according to the movement of the projection object not only when the projection object is stationary but also when the projection object moves or changes its shape to further enhance the effect of the effect. Has been proposed. For example, Patent Document 1 discloses a technique for controlling the amount of emitted light flux of a light source by controlling the input signal so as to increase or decrease in conjunction with the projection distance from the projection surface.

Japanese Unexamined Patent Publication No. 2011-22160

However, even if the amount of luminous flux emitted from the light source is controlled according to the projection distance from the projection surface, the visibility of the projected image may deteriorate when the moving speed of the projection surface changes.

Therefore, an object of the present invention is to provide a projection control device that improves the visibility of a projected image projected on a projection object according to the movement of the projection object.

In order to achieve the above object, the projection control device as one aspect of the present invention is the moving speed of the projection object or the projection object from the image pickup device that images the projection object on which the image is projected by the projection device. A receiving means that receives projection target information regarding at least one of the distances between the and the projection device and the projection target information and acquires at least one of the movement speed or the distance from the projection target information, and the movement speed or the said It is characterized by comprising a control determination means for determining a control value of image processing for an image projected by the projection device according to at least one of the distances.

Further, the projection control method as one aspect of the present invention is the moving speed of the projection object or the projection object and the projection device from the image pickup device that images the projection object on which the image is projected by the projection device. A receiving step that receives projection target information for at least one of the distances and acquires at least one of the movement speed or the distance from the projection target information, and at least one of the movement speed or the distance. Correspondingly, it is characterized by including a control determination step of determining a control value of image processing for the projected image by the projection device.

According to the present invention, the visibility of the projected image projected on the projected object can be improved according to the movement of the projected object.

It is a figure which shows the configuration example of the system including the projection control device. It is a figure which shows the configuration example of the projection control device. It is a flowchart which illustrates the projection control processing. It is a figure which illustrates the lookup table used for the determination of the control of a projected image. It is a figure which illustrates the image projected by the projector based on the control value.

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

<Embodiment>
Hereinafter, the projection control device and the projection control method according to the present embodiment will be described with reference to FIGS. 1 to 5. In the present embodiment, the projection control device controls an image to be projected (hereinafter, also referred to as a projected image) and a light source according to the moving speed of the projection object and the distance from the projection device (projector). The projection control device can control the projection of the projected image by, for example, adjusting the saturation, resolution, enhancer, and contrast of the projected image, or adjusting the intensity of the light source. By controlling the projected image and the light source, the visibility of the projected image is improved.

(System configuration)
FIG. 1 is a diagram showing a configuration example of a system including a projection control device. The projection control device 100 is connected to the camera 110 and the projector (projection device) 120 via the network 140. The projection control device 100 projects an image onto the projection object 130 via the projector 120 so as to follow the movement of the projection object 130 that moves freely.

The projection control device 100 receives the projection target information regarding the moving speed of the projection target 130 and the distance from the projector 120 from the camera 110. The projection target information may include the moving speed of the projection target 130 calculated by the camera 110 and the distance from the projector 120. Further, the projection target information may be an image captured by the camera 110, or may be information on the position, distance, and vector (moving speed, traveling direction) of the projection target 130 calculated by the camera 110. .. The projection control device 100 can calculate or acquire the moving speed of the projection target 130 and the distance between the projection target 130 and the projector 120 from the projection target information received from the camera 110.

The projection control device 100 determines various control values for the projection of the projector 120 based on the acquired moving speed of the projection object 130 and the distance from the projector 120. The projection control device 100 adds information on the determined control value to the projected image data and transmits the information to the projector 120.

The camera 110 is a high-speed camera, and can preferably shoot at a frame rate of 1000 fps or more. Further, the camera 110 has a function capable of measuring the distance to the subject, which is the projection target 130, and the position of the subject. The camera 110 holds information on the installation position of the projector 120 in advance, and photographs an area including a range in which the projector 120 can project. By analyzing the captured image, the camera 110 can calculate the position in the projection region of the projector 120, the distance from the projector 120, the vector (moving speed, traveling direction), and the like for the moving projection object 130. The camera 110 can detect the movement of pixels by using a plurality of captured images taken at high speed, and can calculate a vector from the movement amount.

The projector 120 processes the projected image received from the projection control device 100 according to the control information added to the projected image data, controls the light source and the lens, and projects the image onto the projection object 130.

The projection object 130 is a subject that moves within a range that the projector 120 can project. FIG. 1 shows an example of projecting a projected image on a person as a projection object 130, but the projected image may be projected not only on a person but also on a screen or the like.

The network 140 includes, for example, a public communication network such as the Internet and a wireless communication network such as WiFi. The network 140 may be a wired connection using a USB cable, a LAN cable, or the like, or a wireless connection using WiFi or the like.

(Device configuration)
The device configuration of the projection control device 100 shown in FIG. 1 will be described. The projection control device 100 is a computer, workstation, or the like for controlling the projection of the projector 120 onto the projection object 130. The projection control device 100 has a processor such as a CPU and a DSP, a main storage unit such as a read-only memory (ROM) and a random access memory (RAM), and an auxiliary storage unit such as an EPROM, a hard disk drive (HDD), and a removable media. Further, the projection control device 100 has a communication unit for communicating with other devices such as the camera 110 and the projector 120.

The auxiliary storage unit stores an operating system (OS), various programs, various tables, and the like. The processor loads and executes the program stored in the auxiliary storage unit in the work area of the main storage unit, and can realize the functions of at least a part of the functional blocks of the projection control device 100 through the execution of the program. .. However, some or all of the functions may be realized by hardware circuits such as ASICs and FPGAs. Further, the projection control device 100 is not limited to the case where it is realized by a single physical configuration, and may be configured by a plurality of computers that cooperate with each other.

(Functional configuration)
FIG. 2 is a diagram showing a configuration example of a functional block of the projection control device 100. The projection control device 100 includes a reception unit 101, a control determination unit 102, and a control information addition unit 103. Further, the control determination unit 102 includes a light source control unit 104, an image processing control unit 105, and a lens control unit 106. Further, the projection control device 100 includes a control unit (not shown) that controls each functional block. The control unit is connected to each functional block by a control bus. Hereinafter, each functional block will be described.

The receiving unit 101 receives the projection target information (here, position information, distance information, and vector information) of the projection target 130 transmitted from the camera 110. In the present embodiment, the position information, the distance information, and the vector information are calculated by the camera 110, but these information (parameters) may be calculated by the projection control device 100.

For example, the receiving unit 101 of the projection control device 100 may receive the captured image from the camera 110 and calculate the vector information. Further, the receiving unit 101 may receive the distance between the projection object 130 and the camera 110 from the camera 110 and calculate the position and distance of the projection object 130 with respect to the projector 120. Further, the receiving unit 101 can calculate the moving speed from the vector information. The receiving unit 101 transmits the received or calculated distance information, position information, and vector information (moving speed information) to the control determination unit 102.

The control determination unit 102 determines various controls when the projection image is projected by the projector 120 based on the distance information, the position information, and the vector information (movement speed information) of the projection object 130 received from the reception unit 101. Here, the light source control unit 104, the image processing control unit 105, and the lens control unit 106 included in the control determination unit 102 will be described.

The light source control unit 104 determines a control value for controlling the brightness when the projector 120 projects a projected image. The brightness control value can be expressed by, for example, a normalized luminous flux amount with the maximum value of the emitted luminous flux amount of the light source as 100. The light source control unit 104 can determine the brightness control value according to the moving speed of the projection object 130 and the distance from the projector 120 with reference to the look-up table described later.

In the present embodiment, the image processing control unit 105 determines the control value of image processing based on at least one of the moving speed of the projection object 130 and the distance from the projector 120. The image processing includes processing such as resolution conversion processing, low-pass filter processing (LPF), enhancer processing, and contrast enhancement processing.

The resolution conversion process is a control for enlarging or reducing the projected image according to the size of the projection object 130. The image processing control unit 105 can determine the size of the projection object 130 based on the distance from the projector 120. The control value of the resolution conversion process can be represented by, for example, the enlargement ratio or reduction ratio of the resolution. The image processing control unit 105 can determine the control value of the resolution conversion processing according to the distance of the projection object 130 from the projector 120 by referring to the look-up table described later.

The low-pass filter process is a process of smoothing an image by filtering and deleting high-frequency components of the image. The control value of the low-pass filter processing can be represented by, for example, a cutoff frequency that is a boundary between a passing frequency component and a blocking frequency component. The image processing control unit 105 can determine the control value of the low-pass filter processing according to the moving speed of the projection object 130 and the distance from the projector 120 with reference to the look-up table described later.

The enhancer process is a process of emphasizing the edges of an image. The contrast enhancement process is a process of applying a gain to pixel data or performing gradation conversion using a gamma curve. The image processing control unit 105 can determine the control value of the enhancer processing or the contrast enhancement processing according to the moving speed of the projection object 130 and the distance from the projector 120 with reference to the look-up table described later.

When the moving speed of the projection object 130 and the distance to the projector 120 are equal to or higher than the respective predetermined threshold values, the image processing control unit 105 further improves the visibility of the projected image by executing the enhancer processing after the low-pass filter processing. Can be made to. When either the moving speed of the projection object 130 or the distance to the projector 120 is equal to or greater than a predetermined threshold value, the enhancer process may be controlled to be executed after the low-pass filter process.

The predetermined threshold value for the moving speed here can be, for example, 76 when the moving speed of the projected object 130 is normalized by a value from 0 to 100. Further, the predetermined threshold value for the distance to the projector 120 can be, for example, 60 when the distance to the projector 120 in the projection area is normalized by a value from 0 to 100.

The image processing control unit 105 can perform low-pass filter processing, enhancer processing, contrast enhancement processing, saturation expansion processing, and gamma correction processing on the projected image. The saturation expansion process is a process for adjusting the saturation of a projected image. The control value of the saturation expansion process can be expressed by, for example, the rate of increasing the saturation. The image processing control unit 105 can increase the saturation and improve the visibility in response to the increase in the moving speed of the projection object 130, for example. The gamma correction process is a process of correcting the gamma value according to the moving speed of the projection object 130 or the distance from the projector 120. The control value of the gamma correction process can be represented by, for example, a gamma value according to the distance between the projection object 130 and the projector 120.

The lens control unit 106 determines the control of the focus processing and the zoom processing of the projector 120. The lens control unit 106 controls, for example, to prioritize focus control and zoom control over image processing control when the moving speed of the projection object 130 and the distance to the projector 120 are equal to or less than their respective predetermined threshold values. To determine. When either the moving speed of the projection object 130 or the distance to the projector 120 is equal to or less than a predetermined threshold value, the control may be determined so as to give priority to the focus control and the zoom control.

The predetermined threshold value for the moving speed here can be, for example, 25 when the moving speed of the projected object 130 is normalized by a value from 0 to 100. Further, the predetermined threshold value for the distance to the projector 120 can be, for example, 30 when the distance to the projector 120 in the projection area is normalized by a value from 0 to 100. Further, giving priority to focus control and zoom control means controlling the projector 120 to execute image processing within a range of surplus time and processing capacity after focus processing and zoom processing when projecting a projected image. ..

When the moving speed is slow and the distance is short, by giving priority to focus control and zoom control, projection following the projection target 130 becomes possible, and the visibility of the user is improved. On the other hand, the lens control unit 106 allows a slight shift in focus when the moving speed of the projection object 130 is faster than, for example, 76, or when the distance from the projector 120 is more than 60. Control may be determined.

The control determination unit 102 transmits the control information determined by the light source control unit 104, the image processing control unit 105, and the lens control unit 106 to the control information addition unit 103 as projection control information.

The control information addition unit 103 adds the projection control information received from the control determination unit 102 to the projection image data input from the external device. The control information addition unit 103 transmits the projection image data to which the projection control information is added to the projector 120. Although the projection image data is shown in FIG. 2 as an example of being input from the outside, the projection control device 100 may store the projection image data in the auxiliary storage device in advance or generate the projection image data in the projection control device 100. It may be configured.

(Projection control processing)
FIG. 3 is a flowchart illustrating the projection control process. The projection control process includes adjustment of the brightness of the light source and image processing for the projected image. The projection control device 100 executes the projection control process according to the movement of the projection object 130. The projection control device 100 receives the projection target information regarding the movement of the projection target 130 from the camera 110. The projection control process shown in FIG. 3 is started, for example, when the projection control device 100 receives projection target information from the camera 110.

In S320, the receiving unit 101 receives the projection target information from the camera 110. The projection target information received from the camera 110 includes information on the position of the projection target 130 calculated by the camera 110, the distance from the projector 120, and the vector (moving speed, traveling direction). The receiving unit 101 may receive the captured image of the projection target 130 from the camera 110 as the projection target information, and calculate the position, distance, and vector information of the projection target 130 from the received captured image. The receiving unit 101 transmits information on the position, distance, and vector of the projection object 130 to the control determination unit 102.

In S321, the control determination unit 102 determines the control of the light source and the image processing for the projection of the projected image based on the information received from the reception unit 101. Specifically, the light source control unit 104, the image processing control unit 105, and the lens control unit 106 included in the control determination unit 102 respectively set various control values related to the light source, image processing, and lens in a look-up table (LUT, Look Up Table). ) To determine. Here, the lookup table to which the control determination unit 102 is referred to will be described with reference to FIG.

FIG. 4 is a diagram illustrating a look-up table used for determining the control of the projected image. The lookup table is stored in advance in a storage unit (auxiliary storage device) (not shown). The control determination unit 102 refers to the look-up table and determines various control values when the image is projected by the projector 120 based on at least one of the moving speed of the projection object 130 and the distance from the projector 120. To do.

The look-up table shown in FIG. 4 includes fields of distance, moving speed, light source control value, and image processing control value. The control determination unit 102 acquires (calculates) the distance between the projection target 130 and the projector 120 and the moving speed of the projection target 130 from the projection target information received from the camera 110. Then, the control determination unit 102 can determine the light source control value and the image processing control value by referring to the corresponding row of the lookup table.

In the example of FIG. 4, the distance field and the moving speed field are normalized by a value from 0 to 100. The distance is divided into three stages (short distance 0 to 15, medium distance 16 to 50, and long distance 51 to 100). Further, the moving speed is divided into three stages (low speed 0 to 25, medium speed 26 to 75, high speed 76 to 100) for each distance classification.

For example, an example will be described in which the distance between the projection object 130 and the projector 120 is “12” (short distance) and the moving speed of the projection object 130 is “80”. In this case, the light source control unit 104 determines the light source control value as “60”. In the example of FIG. 4, the light source control value field is normalized from 0 to 100.

Further, since the distance between the projection object 130 and the projector 120 is short, the image processing control unit 105 sets the control value for resolution conversion between 101% and 150%. The control value of the resolution conversion may be further defined for each movement speed division in the lookup table. Further, the image processing control unit 105 may determine the control value of the resolution conversion according to the moving speed.

Among the image processing control values, the image processing control unit 105 sets the low-pass filter processing (LPF) control value to "weak", the enhancer processing control value to "medium", and the contrast enhancement processing control value to "medium". To do.

Although the corresponding field is not shown in FIG. 4, the lens control unit 106 sets a control value (setting) for lens control based on the distance between the projection object 130 and the projector 120 and the moving speed of the projection object 130. ) Is determined. For example, when the distance of the projection object 130 from the projector 120 is short, the lens control unit 106 gives priority to the zoom and focus processing over the control of the image processing, and the projected image with respect to the projection object 130. May be made to follow. Further, when the moving speed of the projection object 130 is "76" or more, the lens control unit 106 may lower the priority of the focus to allow the shift of the focus within a predetermined range.

As described above, the control determination unit 102 determines various control values by the light source control unit 104, the image processing control unit 105, and the lens control unit 106, and the determined control value information is used as projection control information as a control information addition unit. Send to 103.

In S322 of FIG. 3, the control information addition unit 103 adds the projection control information received from the control determination unit 102 to the projection image data projected on the projector 120. The projected image data may be image data input from the outside, an image stored in the storage unit, or an image generated in the projection control device 100.

In S323, the control information addition unit 103 transmits the projection image data to which the projection control information is added to the projector 120, and the projection control process shown in FIG. 4 ends. When the projector 120 receives the projected image data to which the projection control information is added, the projector 120 projects the projected image based on the added projection control information.

Here, an example of a projected image projected by the projector 120 will be described with reference to FIG. FIG. 5 is a diagram illustrating an image projected by the projector 120 based on the control value determined by the control determination unit 102. FIG. 5 describes an example in which the optical zoom value is fixed and the projected image is laid out according to the movement of the projection object 130 by resolution conversion processing such as enlargement / reduction of the projected image.

The image illustrated in FIG. 5 is composed of an uppercase alphabet (large font size) "ABCD", a lowercase alphabet (small font size) "abcd", and a figure "○ □" displayed in the center. To make it easier to see the change in contrast, "○" is filled with light gray and "□" is filled with dark gray.

The projection range is a black-filled area, and the projected image is a white-filled area. The range of the projected image changes in size within the projection range according to the position of the projection object 130 (distance from the projector 120).

FIG. 5A shows a state in which the projector 120 is not controlled according to the distance to the projection object 130 and the moving speed of the projection object 130. This state corresponds to the case where the distance between the projection object 130 and the projector 120 is a short distance (0 to 15) and the moving speed is slow (0 to 25) in the lookup table of FIG.

When the position of the projection object 130 is a short distance and the moving speed is slow, the control determination unit 102 does not control the image processing and does not have to calculate the control value. Therefore, the processing band (processing capacity) of the processor allocated to the control value calculation process is allocated to the control value calculation process of the lens control process such as zoom or focus. As a result, the lens control unit 106 can reliably calculate the control value of the lens control process for following the projection object 130, and prevents the user from recognizing the projection deviation or the focus deviation on the projection object 130. Will be possible.

FIG. 5B is an example of a projected image when the distance of the projection object 130 to the projector 120 is a short distance of 0 to 15 and the moving speed of the projection object 130 is 76 to 100. In this case, the image processing control unit 105 refers to the lookup table, sets the control value of the low-pass filter processing (LPF) to "weak", the control value of the enhancer processing to "medium", and the control value of the contrast enhancement processing to "". Decide on "medium".

Compared with FIG. 5A, the characters are thicker due to the emphasis on the boundaries and darker due to the emphasis on contrast. In addition, the light gray "○" is whiter and the dark gray "□".
"Is blacker.

The control value of the resolution conversion process is 101% to 150% in the lookup table of FIG. 4, but the control value changes depending on the distance from the projection target 130. In FIG. 5B, since the size of the projected image is expanded over the entire projection area range, the control value of the resolution conversion process is set to 150%. Further, since the distance between the projection object 130 and the projector 120 is short, the light source control unit 104 determines the light source control value to "20".

As described above, when the distance between the projection object 130 and the projector 120 is short and the projection object 130 is moving fast, it is possible to improve the visibility of the user by highlighting the projected image to some extent.

FIG. 5C is an example of a projected image when the distance between the projection object 130 and the projector 120 is a long distance of 51 to 100 and the moving speed of the projection object 130 is 76 to 100. In this case, the image processing control unit 105 determines the control values of the low-pass filter processing, the enhancer processing, and the contrast enhancement processing to be “strong”. Further, the light source control unit 104 determines the light source control value to "100" and projects the projected image with the maximum brightness. Further, since the projection target 130 and the projector 120 are separated from each other, the projected image laid out in the projection area range is reduced. Therefore, the control value of the resolution conversion process is determined within the range of 50% to 99%. The black area indicates a non-display area, and black is output as a video signal.

Since the reduced image is laid out within the projection area range according to the position of the projection object 130, the layout position changes according to the projection position received by the control determination unit 102.

Compared with FIG. 5 (a) or FIG. 5 (b), FIG. 5 (c) shows the uppercase alphabet (large font size) “ABCD” with the edges emphasized and displayed more clearly. In addition, the contrast ratio of the figure "○ □" is emphasized more strongly (○ is white, □ is black). On the other hand, in the lowercase alphabet (small font size) "abcd", since the enhancer processing is performed after the low-pass filter processing, it is difficult to recognize the characters.

When the distance between the projection object 130 and the projector 120 is long and the movement speed of the projection object 130 is fast, only large characters and color information in the projection image can be recognized, and the details of the projection image are difficult to recognize. It is in a state. In addition, it may be difficult to recognize large characters and colors. In this way, when it is difficult for the user to recognize the details of the projected image, the information of the projected image is filtered, and only the information recognizable by the user is emphasized and projected. As a result, the user can more reliably recognize the recognizable information.

In the above-described embodiment, the projection control device 100 determines various control values of the projected image according to the movement (moving speed and distance from the projector 120) of the projection object 130. The projector 120 receives the control information determined by the projection control device 100 and projects the projected image according to the control information. This makes it possible to improve the visibility of the projected image projected on the projection object 130.

Further, the control value of the lookup table illustrated in FIG. 4 is an example, and is not limited to this. For example, the look-up table may be controlled to expand the saturation or color and correct the gamma value as in the contrast expansion process. Further, the determination element for determining various control values may determine the control based on the moving speed without including the distance.

Further, in the present embodiment, the control determination unit 102 is provided in the projection control device 110 different from the projector 120, but the function of the control determination unit 102 may be incorporated in the projector 120.

Further, in the present embodiment, the control determination unit 102 determines the control value based on the distance between the projection object 130 and the projector 120, but the present invention is not limited to this. For example, the control determination unit 102 may determine the control value based on the distance between the projection object 130 and the position of the user who visually recognizes the projected image.

Further, in the present embodiment, the projection control device 110 follows the change in the distance between the projection object 130 and the projector 120 by converting the resolution, but it may be made to follow by using the optical zoom process. Good.

Further, although the various control values described in FIG. 4 are abstracted and described as weak, medium, and strong, they may be control values shown by specific numerical values. For example, the filter coefficient of enhancer processing or low-pass filtering processing may be defined in the lookup table as a control value.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

<Other Embodiments>
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

100: Projection control device 101: Reception unit 102: Control determination unit 110: Camera 120: Projector (projection device)

Claims (13)

Receives projection target information regarding at least one of the moving speed of the projection object and the distance between the projection object and the projection device from the imaging device that captures the projection object on which the image is projected by the projection device. Then, a receiving means for acquiring at least one of the moving speed and the distance from the projection target information, and
A control determining means for determining a control value of image processing on a projected image by the projection device according to at least one of the moving speed and the distance.
A projection control device characterized by comprising. It is characterized by further comprising a control information adding means for adding the determined control value information to the projected image and transmitting the projected image to which the determined control value information is added to the projection device. The projection control device according to claim 1. The image processing according to claim 1 or 2, wherein the image processing includes at least one of a resolution conversion process, a low-pass filter process, an enhancer process, a saturation expansion process, a gamma correction process, and a contrast enhancement process. Projection control device. Any one of claims 1 to 3, wherein the control determining means further determines a control value for controlling a light source of the projection device according to at least one of the moving speed and the distance. The projection control device according to item 1. The claim is characterized in that, when the moving speed and the distance are equal to or higher than the respective predetermined threshold values, the control determining means determines the control so as to perform the enhancer process after performing the low-pass filter process on the projected image. The projection control device according to any one of Items 1 to 4. When the moving speed and the distance are equal to or less than a predetermined threshold value, the control determining means performs focus control and zoom control for the projection device to project the image on the projection object by controlling the image processing. The projection control device according to any one of claims 1 to 5, wherein the control is determined so as to give priority to the above. Receives projection target information regarding at least one of the moving speed of the projection object and the distance between the projection object and the projection device from the imaging device that captures the projection object on which the image is projected by the projection device. Then, the receiving step of acquiring at least one of the moving speed and the distance from the projection target information, and
A control determination step of determining a control value of image processing on a projected image by the projection device according to at least one of the movement speed and the distance.
A projection control method comprising. The feature is that the control information addition step of adding the determined control value information to the projected image and transmitting the projected image to which the determined control value information is added to the projection device is further included. The projection control method according to claim 7. The image processing according to claim 7 or 8, wherein the image processing includes at least one of a resolution conversion process, a low-pass filter process, an enhancer process, a saturation expansion process, a gamma correction process, and a contrast enhancement process. Projection control method. Any one of claims 7 to 9, further comprising determining a control value for controlling the light source of the projection device according to at least one of the moving speed and the distance in the control determination step. The projection control method according to item 1. The claim is characterized in that, in the control determination step, when the movement speed and the distance are equal to or higher than the respective predetermined threshold values, the control is determined so that the projected image is subjected to a low-pass filter process and then an enhancer process. Item 6. The projection control method according to any one of Items 7 to 10. In the control determination step, when the moving speed and the distance are equal to or less than the respective predetermined threshold values, the focus control and the zoom control for the projection device to project the image on the projection object are controlled by the image processing. The projection control method according to any one of claims 7 to 11, wherein the control is determined so as to give priority to the above. A program for causing a computer to function as each means of the projection control device according to any one of claims 1 to 6.