JP2009251687A - Video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device for reducing the labor of a passenger, and for reducing the generation of any motion sickness by matching visual information with vestibular information or somatic sensation information generated by the motion of a vehicle by applying visual guidance self-motion sensation while viewing a video in a TV or the like in a vehicle. <P>SOLUTION: This video display device is provided with: an acceleration/deceleration detection means for detecting acceleration in fore-nad-aft directions of a vehicle; a background video generation means for generating a background video based on the acceleration of a vehicle detected by an acceleration/deceleration detection means; a foreground video generation means for generating a foreground video; and a display control means for compounding a background video generated by a background video generation means with the foreground video generated by the foreground video generation means for display. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video display device, and more particularly to a video display device that provides video to a vehicle occupant.

  In recent years, an increasing number of vehicles are equipped with a display for displaying various information. In particular, an increasing number of vehicles are equipped with a display for a navigation device that displays a map centering on the position of the vehicle. In addition, an increasing number of vehicles are equipped with a display for displaying images such as TV (Television), VTR (Video Tape Recorder), DVD (Digital Versatile Disk), movies and games for the passenger seat and the rear seat.

  On the other hand, in vehicles such as automobiles, the vehicle's engine and other drive mechanisms, as well as the road terrain, swells, road surface conditions, curbs, and other vibrations that the automobile chassis receives from outside the vehicle, such as vibration, rocking, and impact There are also vibrations due to accelerating, and there are also vibrations and vibrations caused by acceleration and braking of automobiles.

  When a human is placed in a new movement environment such as by riding a vehicle in this way, the actual sensory information pattern is different from the sensory information pattern accumulated in the central nervous system. There is known a sensory contradiction theory (sensory confusion theory, nervous disagreement theory) in which movement cannot be grasped and is confused (see, for example, Non-Patent Document 1).

  In this case, recognition of a new sensory information pattern occurs in the central nervous system, but it is thought that motion sickness (motion sickness) develops in this adaptation process. The line of sight is fixed especially when reading a book in a car. As a result, motion sickness occurs because the visual information does not match the vestibule information from the movement of the car, especially the rotational sense information detected by the semicircular canal, and the acceleration sensory information and somatic sensory information detected by the otolith. ing.

  It is said that you should close your eyes or look farther in the vehicle to avoid confusion between the visual information and the vestibular information. In addition, it is said that drivers are less likely to get drunk than passengers because they actively take the position of their heads with the least amount of acceleration change by predicting the tension associated with driving and the movement of vehicles.

  As a countermeasure against such a motion sickness, there is a display device that makes it possible for an occupant other than the driver to grasp and predict the current and next movements of the vehicle by using a display device for turning the vehicle left and right, accelerating / decelerating, and stopping (for example, (See Patent Document 1).

In addition, in order to reduce motion sickness of passengers in the rear seats, when receiving steering information from the steering wheel, brakes and turn signals, sounding "Decelerate", "Turn right", or turn right A technology has also been developed in which a right arrow is displayed to notify that the brake is applied or the vehicle turns right or left through hearing or vision (see, for example, Patent Document 2).
Satoshi Matsunaga, Noriaki Takeda: Motion sickness and space sickness, Otolaryngology, Vol. 81, No8, P1095-1120, 1998 JP 2002-154350 A (FIG. 1) JP 2003-154900 A

  However, since the motion sickness countermeasure at the time of acceleration / deceleration by the devices described in Patent Documents 1 and 2 only informs acceleration / deceleration based on the operation information of the accelerator, the brake, etc., the occupant is informed. Thus, two steps are required: a step of recognizing the movement of the vehicle and a step of preparing for it. Therefore, just notifying that the vehicle is accelerating or decelerating does not necessarily lead to preparation, and cannot prevent motion sickness sufficiently.

  Therefore, the present invention has been made in view of the above problems. In other words, while viewing images such as TV on the vehicle, by giving the visually guided self-motion sensation according to acceleration and deceleration, the visual information and the vestibule information and somatosensory information due to the movement of the vehicle are matched, so that the occupant An object of the present invention is to provide an image display device that can reduce the burden of motion and reduce the occurrence of motion sickness during acceleration / deceleration.

An image display apparatus according to the present invention includes an acceleration / deceleration detection unit that detects acceleration in the longitudinal direction of a vehicle, a background image generation unit that generates a background image based on the acceleration of the vehicle detected by the acceleration / deceleration detection unit, and a foreground image. The foreground video generation means for generating and the display control means for combining and displaying the background video generated by the background video generation means and the foreground video generated by the foreground video generation means are provided.
This configuration allows visual information to match the vestibule information and somatic sensory information based on the movement of the vehicle by giving a visually-guided self-motion sensation according to acceleration and deceleration while watching a video such as TV on the vehicle. , The burden on the passenger can be reduced, and the occurrence of motion sickness during acceleration / deceleration can be reduced.

The background video generation means generates a background video that moves in the vertical direction and / or rotates in the pitch direction according to the longitudinal acceleration detected by the acceleration / deceleration detection means, and the display control means includes the background video generation means. Is combined with the foreground image generated by the foreground image generation means and displayed as if the background image is tilted in the pitch direction.
This configuration allows visual information to match the vestibule information and somatic sensory information based on the movement of the vehicle by giving a visually-guided self-motion sensation according to acceleration and deceleration while watching a video such as TV on the vehicle. , The burden on the passenger can be reduced, and the occurrence of motion sickness during acceleration / deceleration can be reduced.

The background image generation means moves downward when the acceleration indicates acceleration according to the longitudinal acceleration detected by the acceleration / deceleration detection means, and / or the upper end rotates in the back direction and the lower end rotates in the front direction. When the acceleration indicates deceleration, the background image is moved upward, and / or the background image is generated with the upper end rotated forward and the lower end rotated backward.
This configuration allows visual information to match the vestibule information and somatic sensory information based on the movement of the vehicle by giving a visually-guided self-motion sensation according to acceleration and deceleration while watching a video such as TV on the vehicle. , The burden on the passenger can be reduced, and the occurrence of motion sickness during acceleration / deceleration can be reduced.

Further, the background video generating means generates a vertical pattern video and / or a horizontal pattern video as the background video.
With this configuration, the image of the vertical pattern and / or the image of the horizontal pattern as the background image moves vertically and / or rotates in the pitch direction according to the acceleration in the front-rear direction. It becomes easy to recognize the acceleration / deceleration in the front-rear direction as visual information, and thus it is easy to generate a visually induced self-motion sensation according to the acceleration / deceleration.

Further, when the background image generation means indicates that acceleration / deceleration has not occurred due to the longitudinal acceleration detected by the acceleration / deceleration detection means, a horizontal pattern indicating a horizontal line is displayed at the center of the display control means. A background image is generated as shown in FIG.
With this configuration, when no longitudinal acceleration of the vehicle is generated, a horizontal pattern indicating a horizontal line is displayed at the center of the display control means, so that no longitudinal acceleration of the vehicle is generated. Can be easily recognized as visual information.

The background video generation means generates a transmitted background video when it indicates that acceleration / deceleration has not occurred due to the longitudinal acceleration detected by the acceleration / deceleration detection means.
With this configuration, when acceleration in the front-rear direction of the vehicle is not generated, the background image is transmitted, so that it is easy to recognize that the acceleration in the front-rear direction of the vehicle is not generated as visual information.

Further, the background video generation means generates a video with a blurred pattern as a background video.
With this configuration, a feeling that a background image exists behind the foreground image is strengthened, and a visually induced self-motion sensation according to acceleration / deceleration is easily generated.

The video display device of the present invention further includes background video setting means for setting background video generation means for generating a background video.
With this configuration, the occupant can set the intensity of the visually induced self-motion sensation by setting the movement of the background video generated by the background video generation means.

Further, the background video setting means is a degree of vertical movement when generating a background video that moves in the vertical direction and / or rotates in the pitch direction according to the longitudinal acceleration detected by the acceleration / deceleration detection means, And / or setting the degree of rotation in the pitch direction.
With this configuration, the occupant can set the intensity of the visually induced self-motion sensation by setting the movement of the background video generated by the background video generation means.

The background video setting means selects the type of background video.
With this configuration, the occupant can set the type of background video generated by the background video generation means.

The vehicle of the present invention includes the above-described video display device.
This configuration allows visual information to match the vestibule information and somatic sensory information based on the movement of the vehicle by giving a visually-guided self-motion sensation according to acceleration and deceleration while watching a video such as TV on the vehicle. , The burden on the passenger can be reduced, and the occurrence of motion sickness during acceleration / deceleration can be reduced.

  As described above, according to the present invention, visual information and vestibule information and somatosensory information based on the movement of the vehicle are obtained by giving a visually guided self-motion sensation according to acceleration / deceleration while viewing images such as TV on the vehicle. By matching, it is possible to provide an image display device that can reduce the burden on the occupant and reduce the occurrence of motion sickness during acceleration / deceleration.

Hereinafter, a video display device according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of a video display apparatus according to an embodiment of the present invention. In FIG. 1, an image display apparatus includes an acceleration / deceleration detection unit 101 that detects acceleration in the longitudinal direction of a vehicle, a background image generation unit 102 that generates a background image based on the acceleration detected by the acceleration / deceleration detection unit 101, and a foreground image. The foreground video generation means 103 for generating the background image, the background video generated by the background video generation means 102 and the foreground video generated by the foreground video generation means 103 are combined and displayed, and the background for setting the background video generation means 102 is set. Video setting means 105 is provided.

  The acceleration / deceleration detection means 101 is, for example, an acceleration sensor that detects the longitudinal acceleration of the vehicle. A computer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like may be installed in the vehicle, and the computer may function as the acceleration / deceleration detection unit 101.

The background video generation unit 102 generates a background video according to the longitudinal acceleration of the vehicle detected by the acceleration / deceleration detection unit 101.
The foreground video generation unit 103 is configured by a device that reduces and outputs a video such as a television, a DVD (Digital Versatile Disc), a movie, and a game as a foreground video.

The display control means 104 synthesizes and displays the background video generated by the background video generation means 102 and the foreground video output by the foreground video generation means 103. The foreground video output by the foreground video generation unit 103 is combined and displayed so that the background video generated by the background video generation unit 102 becomes the background. The display control means 104 is composed of at least one of a display such as a liquid crystal display, a CRT display, an organic EL display, and a plasma display, a projector that displays an image on a screen, a head mounted display, and a head up display.
Moreover, the display control means 104 is provided in the rear seat of a vehicle, a ceiling, etc., and should just be a position where crew members other than a driver can see. Of course, it may be provided at a position where the driver can also see, but it is preferably provided at a position where the passenger can see with priority.

  The background video setting unit 105 is, for example, an input operation unit such as a keyboard or a touch panel in order to select the type of background video generated by the background video generation unit 102. The background video setting unit 105 generates a background video that moves in the vertical direction and / or rotates in the pitch direction according to the longitudinal acceleration detected by the acceleration / deceleration detection unit 101. The degree of movement in the vertical direction and / or the degree of rotation in the pitch direction is set.

The operation of the video display apparatus configured as described above will be described based on the flowchart of FIG.
First, the acceleration / deceleration detection means 101 detects the current longitudinal acceleration of the vehicle (step S201).
Next, in accordance with the current longitudinal acceleration of the vehicle detected in step S201, a background image that moves up and down and / or rotates in the pitch direction is generated based on the setting of the background image setting means 105 (step S202).
Next, the foreground video generation means 103 reduces the video and outputs it as a foreground video (step S203). Note that the foreground video output by the foreground video generation unit 103 is not a reduction of the video, and a part of the video may be cut out.
Next, the background video generated in step S202 and the foreground video generated in step S203 are combined and displayed by the display control means 104 (step S204). In step S204, the foreground video generated by the foreground video generation unit 103 in step S203 is combined and displayed so that the background video generated by the background video generation unit 102 in step S202 is the background.

The composite video displayed on the display control means 104 at this time is the foreground video 3 as shown in FIG.
A background image 302 is displayed around 01 as a background. The background image 302 is an image having a vertical pattern and / or a horizontal pattern. The background image 302 has a horizontal pattern 303 indicating a horizontal line. The pattern indicating the horizontal line is displayed at the center of the display control means 104 as shown in FIG. 3A when acceleration / deceleration has not occurred. According to the longitudinal acceleration detected by the acceleration / deceleration detecting means 101, when the acceleration indicates the acceleration in the forward direction of the vehicle, the background image moves downward as shown in FIG.・ The lower end of the screen is rotated forward. When the acceleration indicates deceleration in the forward direction of the vehicle, as shown in FIG. 3C, the background image is displayed in the upward direction, the upper end portion is rotated forward, and the lower end portion is rotated in the rear direction. Depending on the longitudinal acceleration detected by the acceleration / deceleration detection means 101, when the acceleration indicates acceleration in the vehicle forward direction, the background image moves downward, or the upper end rotates backward and the lower end rotates forward. Only one of the operations may be performed. When the acceleration indicates deceleration in the forward direction of the vehicle, only one operation in which the background image moves upward, or the upper end rotates toward the front and the lower end rotates toward the back may be used. When acceleration indicates acceleration in the forward direction of the vehicle and deceleration in the backward direction of the vehicle, the direction of the vertical movement and the rotation in the pitch direction of the background image are the same. When the acceleration indicates deceleration in the forward direction of the vehicle and acceleration in the backward direction of the vehicle, the direction of the vertical movement and the rotation in the pitch direction of the background image is the same.

FIG. 4 is an example of a background image without a horizontal pattern indicating a horizontal line with respect to the background image of FIG.
FIG. 5 is an example of a background image in which the background image of FIG. 3 is blurred. When the background video is out of focus, the feeling that the background video exists behind the foreground video is strengthened, and a visually induced self-motion sensation corresponding to acceleration / deceleration is likely to occur.
Here, the background video types exemplified in FIGS. 3, 4, and 5 can be set by the background video setting means 105.

  In the example of FIG. 3, the background video 302 is displayed with respect to the foreground video 301 by moving in the vertical direction and rotating in the pitch direction. This processing can be expressed by the concept of a virtual camera and a virtual space in 3D computer graphics. FIG. 6 is a view of the virtual space from the side, and shows the operation of the background video when acceleration / deceleration does not occur and during acceleration. The angle of view of the virtual camera is wider than that of the foreground image 601. For this reason, the foreground image 601 appears to be relatively reduced, and the background image 602 is displayed behind the periphery of the foreground image 601. At the time of acceleration, the background image 602 is displayed like the background image 603 with the background image moving downward and the upper end rotated in the back direction and the lower end rotated forward. In a three-dimensional virtual space, if the distance from the virtual camera to the background image is L, the center coordinates 604 of the background image 602 can be expressed as (0, 0, L). At this time, if the parameter representing the amount of movement of the background image is an angle θa, the center coordinates 605 of the background image 603 during acceleration can be expressed by (0, L × sin θa, L × cos θa). A parameter representing the rotation amount of the background image in the pitch direction is denoted by θb.

Assuming that the acceleration in the longitudinal direction of the vehicle is α, the parameter θa representing the movement amount of the background image can be expressed by a function of α as in relational expression 1. Here, the acceleration α is positive when accelerating in the forward direction of the vehicle, negative when decelerating in the forward direction of the vehicle, negative when accelerating in the backward direction of the vehicle, positive when decelerating in the backward direction of the vehicle, or The parameter θa representing the amount of movement of the background video is positive when moving downward and negative when moving upward.
θa = Func1 (α) Relational expression 1

Here, the function Func1 can be set by the background video setting means 105. When the parameter θa representing the vertical movement amount of the background image is proportional to the longitudinal acceleration α of the vehicle, the relational expression 1 can be represented by the relational expression 2.
θa = k1 × α Relational expression 2
In the relational expression 2, the coefficient k1 is an optimum predetermined value calculated in a preliminary experiment by a subject. Here, relational expression 2 can be expressed in FIG. A straight line 701 in FIG. 7 indicates that the parameter θa representing the amount of vertical movement of the background image is proportional to the longitudinal acceleration α of the vehicle. A straight line 702 in FIG. 7 indicates that the parameter θa representing the vertical movement amount of the background image is large when the vehicle longitudinal acceleration α is large. This is a visual stimulus corresponding to the vehicle longitudinal acceleration α. Is strong. A straight line 703 in FIG. 7 shows an example in which the parameter θa representing the amount of vertical movement of the background image is small when the longitudinal acceleration α of the vehicle is large. This is a visual indication corresponding to the longitudinal acceleration α of the vehicle. Indicates that the stimulus is weak.

  The relational expression 1 of the parameter θa representing the vertical movement amount of the background image with respect to the longitudinal acceleration α of the vehicle can also be expressed as shown in FIG. In FIG. 7, the relationship between α and θa is linear, but in the curve 801 in FIG. 8, the absolute value of θa is saturated where the absolute value of α is large. This indicates that the amount of movement in the vertical direction of the background image is kept constant even when sudden acceleration or braking occurs, and the background image does not become difficult to see.

  In addition, as shown by a curve 901 in FIG. 9, when the longitudinal acceleration of the vehicle is equal to or less than a certain threshold value, θa may be 0, that is, the background image may be stopped. In this way, when a slight acceleration occurs, the background image is stopped, and the background image always moves, so that it is difficult to see. In the curve 901 of FIG. 9, the absolute value of θa is saturated where the absolute value of α is large. This indicates that the amount of movement in the vertical direction of the background image is kept constant even when sudden acceleration or braking occurs, and the background image does not become difficult to see.

Further, if the parameter representing the rotation amount of the background image in the pitch direction is an angle θb, θb can be expressed by a function of α as in relational expression 3. Here, the acceleration α is positive when accelerating in the forward direction of the vehicle, negative when decelerating in the forward direction of the vehicle, negative when accelerating in the backward direction of the vehicle, positive when decelerating in the backward direction of the vehicle, or The parameter θb that represents the amount of rotation in the pitch direction of the background image is positive when the upper end rotates in the back direction and the lower end rotates in the front direction, and negative when the upper end rotates in the front direction and the lower end rotates in the back direction. And
θb = Func2 (α) Relational expression 3

Here, the function Func2 can be set by the background video setting means 105. When the rotation amount of the rotation in the pitch direction of the background image is proportional to the acceleration α in the longitudinal direction of the vehicle, the relational expression 3 can be expressed by the relational expression 4.
θb = k2 × α Relational expression 4
In the relational expression 4, the coefficient k2 is an optimum predetermined value calculated in a preliminary experiment by a subject. Relational expression 2 can be expressed in FIG. A straight line 1001 in FIG. 10 indicates that the parameter θb representing the rotation amount of the rotation in the pitch direction of the background image is proportional to the acceleration α in the longitudinal direction of the vehicle. A straight line 1002 in FIG. 10 indicates that the parameter θb representing the rotation amount of the rotation in the pitch direction of the background image is large when the acceleration α in the longitudinal direction of the vehicle is large. This corresponds to the acceleration α in the longitudinal direction of the vehicle. The visual stimulus is strong. A straight line 1003 in FIG. 10 shows an example in which the parameter θb representing the rotation amount of the rotation in the pitch direction of the background image is small when the acceleration α in the longitudinal direction of the vehicle is large. This corresponds to the acceleration α in the longitudinal direction of the vehicle. The visual stimulus is weak.

The relational expression 3 of the parameter θb representing the rotation amount of the rotation of the background image in the pitch direction with respect to the longitudinal acceleration α of the vehicle can also be expressed as shown in FIG. In FIG. 10, the relationship between α and θb is linear, but in the curve 1101 of FIG. 11, the absolute value of θb is saturated where the absolute value of α is large. This indicates that the amount of rotation in the pitch direction of the background image is kept constant even when sudden acceleration or braking occurs, and the background image does not become difficult to see.

  Also, as shown by a curve 1201 in FIG. 12, when the longitudinal acceleration of the vehicle is equal to or smaller than a certain threshold value, θb may be 0, that is, the background image may be stopped. In this way, when a slight acceleration occurs, the background image is stopped, and the background image is always difficult to see because the background image is always rotated. In the curve 1201 of FIG. 12, the absolute value of θb is saturated where the absolute value of α is large. This indicates that the amount of rotation in the pitch direction of the background image is kept constant even when sudden acceleration or braking occurs, and the background image does not become difficult to see.

  Note that the composite video displayed on the display control means 104 may be displayed with the background video transmitted as shown in FIG. 13A when acceleration / deceleration has not occurred. The transmission ratio can be set by the background video setting means 105.

  Next, in step 205, it is determined whether or not the video display device is in the operation mode. If the image display device is in the operation mode, the process returns to step S201 to continue the process. Here, the operation mode is a switch as to whether or not the function of displaying the background image of the image display device is enabled. When the operation mode is not operated, a normal image is displayed, and the image is displayed. No reduction or background video is displayed.

The effect of the video display device according to the first embodiment of the present invention has been confirmed by conducting an actual vehicle experiment, and will be described below.
Objective: To confirm the effect of the video display apparatus according to the first embodiment of the present invention through actual vehicle experiments.
・ Experimental method: The actual vehicle experiment was conducted with sufficient explanation of the purpose, procedure, and possible effects of the experiment on the subject and prior written consent from the subject. An actual vehicle experiment was conducted with the subject seated on the second row seat, the third row seat, and the fourth row seat of a 10-seat van with four rows. In order to confirm the effect, a comparison was made under three conditions: the condition of no TV viewing without watching TV, the condition of TV viewing with TV viewing, and the conditions of the first embodiment. No special restrictions or tasks were imposed under the conditions of no TV viewing. Under the TV viewing condition and the first embodiment condition, an 11-inch TV was attached approximately 60 [cm] ahead of the subject at the position of the headrest in the front seat, and a foreground image (movie) was viewed. The relational expression 1 representing the amount of vertical movement of the background image relative to the acceleration of the car and the relational expression 3 representing the amount of rotation of the background image in the pitch direction relative to the acceleration of the car are determined in advance by preliminary experiments and are the same for all subjects. Applied parameters. The 11-inch TV has a resolution of 800 dots horizontal, 480 dots horizontal, 244 mm wide, 138 mm long, and 280 mm diagonal, and the foreground video (movie) is displayed with a reduced size of 205 mm wide and 115 mm long. The ride time was 18 minutes, and I drove on a road with many curves and no traffic lights.

The car sickness discomfort was evaluated by subjective evaluation based on an 11-level rating scale from 0 (no discomfort) to 10 (strength discomfort, tolerance limit) every minute. Discomfort, a rating scale, was converted to a distance scale, an equally spaced scale. The test was conducted on 137 trials using healthy men and women around 20 years old. The TV viewing-free condition was 44 trials, the TV viewing condition was 46 trials, and the first embodiment condition was 47 trials.
Experimental results: FIG. 14 shows the average value of discomfort for each condition scaled distance. The horizontal axis represents the boarding time, and the vertical axis represents discomfort. Compared with the TV viewing-free condition, the TV viewing condition is greatly uncomfortable. Compared to the TV viewing condition, it was confirmed that the discomfort was reduced in the first embodiment condition.

As described above, according to the present invention, by providing visual guidance self-motion sensation according to acceleration / deceleration while viewing images such as TV on the vehicle, the vestibule information and somatosensory information based on the movement of the visual information and the vehicle are provided. , The burden on the occupant can be reduced, and the occurrence of motion sickness during acceleration / deceleration can be reduced.

  As described above, the video display device according to the present invention is useful as a motion sickness prevention device for preventing motion sickness of a passenger.

The block diagram which shows the whole structure of the video display apparatus concerning the 1st Embodiment of this invention. The flowchart which shows operation | movement of the video display apparatus which concerns on the 1st Embodiment of this invention. The figure which shows the example of a display of a display part The figure which shows the example of a display of a display part The figure which shows the example of a display of a display part Diagram showing the relationship between the acceleration in the front-rear direction and the motion of the background image The figure which shows the relationship between the amount of movement parameter in the vertical direction of the background image and the longitudinal acceleration The figure which shows the relationship between the amount of movement parameter in the vertical direction of the background image and the longitudinal acceleration The figure which shows the relationship between the amount of movement parameter in the vertical direction of the background image and the longitudinal acceleration The figure which shows the relationship between the rotation amount parameter in the pitch direction of the background image and the longitudinal acceleration The figure which shows the relationship between the rotation amount parameter in the pitch direction of the background image and the longitudinal acceleration The figure which shows the relationship between the rotation amount parameter in the pitch direction of the background image and the longitudinal acceleration The figure which shows the example of a display of a display part The figure which shows the experimental result for effect description of the video display apparatus which concerns on the 1st Embodiment of this invention

Explanation of symbols

101 Acceleration / deceleration detection means 102 Background video generation means 103 Foreground video generation means 104 Display control means 105 Background video setting means 301, 401, 501, 601, 1301 Foreground video 302, 402, 502, 602, 603, 1302 Background video 303, 503, 1303 Horizontal pattern 604, 605 indicating a horizontal line Center coordinates 701, 702, 703, 801, 901 of the background image 1001, 1002, 1003, 1101 1201 Relationship between the rotation amount parameter in the pitch direction of the background image and the longitudinal acceleration

Claims (11)

Acceleration / deceleration detection means for detecting acceleration in the longitudinal direction of the vehicle;
Background image generation means for generating a background image based on the acceleration of the vehicle detected by the acceleration / deceleration detection means;
Foreground image generation means for generating a foreground image;
An image display apparatus comprising: a display control unit configured to synthesize and display the background image generated by the background image generation unit and the foreground image generated by the foreground image generation unit. The background image generation means generates a background image that moves in the vertical direction and / or rotates in the pitch direction according to the longitudinal acceleration detected by the acceleration / deceleration detection means,
The display control means combines the background video generated by the background video generation means and the foreground video generated by the foreground video generation means, and displays the background video as if it is inclined in the pitch direction. The video display device according to claim 1.   The background image generation means moves downward when the acceleration indicates acceleration according to the longitudinal acceleration detected by the acceleration / deceleration detection means, and / or the upper end is in the back direction and the lower end is in the front direction. 2. A rotating background image is generated when the acceleration indicates deceleration, and / or a background image is generated in which an upper end is rotated forward and a lower end is rotated backward. The video display device described in 1.   2. The video display device according to claim 1, wherein the background video generation unit generates a video with a vertical pattern and / or a video with a horizontal pattern as a background video.   When the background image generating means indicates that acceleration / deceleration has not occurred due to the longitudinal acceleration detected by the acceleration / deceleration detecting means, a horizontal pattern indicating a horizontal line is displayed at the center of the display control means. The image display apparatus according to claim 1, wherein the background image is generated as described above.   2. The background image generation unit according to claim 1, wherein the background image generation unit generates a transparent background image when it indicates that acceleration / deceleration has not occurred due to acceleration in the front-rear direction detected by the acceleration / deceleration detection unit. Video display device.   The video display apparatus according to claim 1, wherein the background video generation unit generates a video with a blurred pattern as a background video.   The video display apparatus according to claim 1, further comprising background video setting means for setting the background video generation means for generating the background video.   The background video setting means, when generating a background video that moves in the vertical direction and / or rotates in the pitch direction according to the longitudinal acceleration detected by the acceleration / deceleration detection means, 9. The video display device according to claim 8, wherein a degree of rotation in the pitch direction is set.   9. The video display apparatus according to claim 8, wherein the background video setting unit selects a type of the background video.   A vehicle comprising the video display device according to claim 1.