WO2011024269A1

WO2011024269A1 - Vehicle-mounted video display and subtitle indication control method for vehicle-mounted video display

Info

Publication number: WO2011024269A1
Application number: PCT/JP2009/064884
Authority: WO
Inventors: 健志幸田; 孝司鈴木; 正吉田
Original assignee: パイオニア株式会社
Priority date: 2009-08-26
Filing date: 2009-08-26
Publication date: 2011-03-03

Abstract

The indication sate of a subtitle on a monitor is changed so as to prevent carsickness beforehand. A vehicle-mounted video display (1) comprises a display section (40) which can display a video image and a subtitle, a subtitle indication control section (14) for controlling the indication state of a subtitle, and a carsickness environment determination section (36) for determining whether the environment is susceptible to carsickness or not, wherein the subtitle indication control section (14) changes the indication of the display section (40) to an indication state for preventing carsickness if it is determined that the environment is susceptible to carsickness as the result of the determination by the carsickness environment determination section (36).

Description

In-vehicle image display device and caption display control method for in-vehicle image display device

The present invention relates to a vehicle-mounted video display device and a caption display control method for a vehicle-mounted video display device, and more particularly to a vehicle-mounted video display device that changes the display state of captions when the vehicle travels and a caption display control method for the vehicle-mounted video display device. About.

Recording media such as DVDs (Digital Versatile Discs) and BDs (Blu-rays Discs) that can record large volumes of data have become widespread, and in-vehicle video display devices also have high image quality and high recording quality. You can view content such as sound quality movies. In addition, in these recording media, a plurality of languages are recorded and can be selected. For example, in the DVD standard, a maximum of 8 languages can be recorded as audio languages and a maximum of 32 languages can be recorded as subtitle languages (sub-pictures).

When a viewer views a content such as a movie, the subtitle is displayed by translating the original language (eg, a foreign language such as English) into the native language of the viewer (eg, Japanese). Alternatively, viewing is performed by so-called “dubbing”, in which a sound obtained by translating the original language of the content (for example, a foreign language such as English) into the native language of the viewer (for example, Japanese) is output. When viewing the content by “dubbing”, subtitles are not normally displayed.

On the other hand, among the in-vehicle video display devices, monitors (front monitors, etc.) installed near the driver's seat are set to stop the display while the vehicle is running for safety reasons. A monitor installed for passengers (such as a rear monitor) or a monitor installed for passengers on a bus or the like can be viewed while the vehicle is running.

However, if the passenger is watching content such as a movie while the vehicle is traveling, the possibility of causing car sickness increases. This can be explained as follows. Human balance organs are stimulated by the vibration and shaking of the vehicle (particularly sudden start and stop where the vibration and shaking are severe, curve running, etc.). On the other hand, since the human visual organ viewing the content sees the video of the content displayed on the monitor, the human visual organ is stimulated by movement in the video space. Thereby, a competition arises between balance sense information and visual information, and the possibility of causing car sickness increases.

特に Especially, subtitle characters are displayed in the content video, and if you keep watching the subtitle characters, the possibility of causing car sickness becomes even higher. In order to reduce the possibility of passengers getting sick, it is desirable to view content without displaying subtitles (for example, viewing with “dubbing” audio).

As a conventional technique for automatically switching the setting of content playback when the vehicle is running and when the vehicle is stopped, for example, Patent Document 1 includes, “Previously voice, subtitles, menu language (eg, playback voice = Japanese, (Subtitle = None, Menu Language = Japanese) is set and stored.When the vehicle is stopped, playback starts with the default audio, subtitle, and menu language set on the DVD. A technique of switching to audio, subtitles, and menu language playback during travel is disclosed.

Japanese Unexamined Patent Publication No. 2006-294080

In the prior art disclosed in Patent Document 1, for example, even when the vehicle is in a playback state with caption display when the vehicle is stopped, the playback state without caption display can be automatically switched when the vehicle travels. However, even when the vehicle is traveling, gaze on the caption display of the passenger may not cause car sickness, such as when the vehicle is traveling with little shaking. Therefore, the above-described conventional technique for switching the setting of content reproduction only by running and stopping of the vehicle is not a technique for preventing car sickness in the in-vehicle video display device. In the above prior art, since the setting is automatically switched every time the vehicle is stopped or started, for example, the setting is frequently switched due to road conditions such as in a traffic jam, and the passengers have calm content. Can no longer appreciate.

The problem to be solved by the present invention is to provide a vehicle-mounted video display device that changes the state of caption display on a monitor so as to prevent car sickness in advance, and a caption display control method for the vehicle-mounted video display device. As an example.

The in-vehicle video display device according to claim 1, a display unit capable of displaying video and subtitles;
A subtitle display control unit for controlling the subtitle display state;
A car sickness environment determination unit that determines whether or not the environment is likely to cause car sickness;
With
As a result of the determination by the vehicle sickness environment determination unit, when it is determined that the environment is likely to cause vehicle sickness, the display of the display unit is changed to a display state for preventing vehicle sickness by the caption display control unit. Features.

The subtitle display control method for an in-vehicle video display device according to claim 13 is a display unit capable of displaying video and subtitles, a subtitle display control unit for controlling the display state of subtitles, and an environment in which car sickness is likely to occur. An intoxication environment determination unit for determining a caption display control method for an in-vehicle video display device comprising:
As a result of the determination by the vehicle sickness environment determination unit, when it is determined that the environment is likely to cause vehicle sickness, the caption display control unit stops displaying captions on the display unit.

It is a figure which shows the structure of the principal part of the vehicle-mounted video display apparatus which concerns on embodiment of this invention. It is a flowchart explaining the procedure of the caption display control method of the vehicle-mounted video display apparatus which concerns on embodiment of this invention. It is a schematic diagram which demonstrates the change of the caption display of the vehicle-mounted video display apparatus which concerns on embodiment of this invention using the example of a display of a display part (monitor). It is a timing chart explaining the example of a timing of a change of subtitle display of the vehicle-mounted video display apparatus concerning the embodiment of the present invention. It is a timing chart explaining the other timing example of the change of the caption display of the vehicle-mounted video display apparatus which concerns on embodiment of this invention. It is a figure which shows typically the output (X-axis, Y-axis, Z-axis) of each axis | shaft of a 3-axis acceleration sensor. It is a schematic diagram for demonstrating the shake detection of the passenger of a vehicle. It is a schematic diagram for explaining detection of the amount of movement of the eyeball using the eyeball movement amount detection means. FIG. 6 is a schematic diagram for explaining a case where a vehicle is in a specific place as an environment where car sickness is likely to occur.

Hereinafter, an in-vehicle video display apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a main part of an in-vehicle video display apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the in-vehicle video display device 1 mainly includes a video / audio control unit 10, an intoxication detection signal generation unit 30, a display unit (monitor) 40, and a speaker 50.

The video / audio control unit 10 includes an optical disk drive 11, a stream buffer 12, a demultiplexer 13, a subtitle display control unit 14, a text subtitle decoder 15, a subtitle plane 16, a plane superimposing unit 17, a video decoder 18, a video plane 19, and an audio decoder. 20, a video output circuit 21 and an audio output circuit 22 are provided.

The intoxication possibility detection signal generation unit 30 includes a GPS receiver 31, a vehicle position detection unit 32, a parking brake detection unit 33, an acceleration detection unit 34, a biological information detection unit 35, and an intoxication environment determination unit 36.

In the video / audio control unit 10, the optical disc drive 11 reads stream data from an optical disc such as DVD or BD, and temporarily stores it in the stream buffer 12. The stream data stored in the stream buffer 12 is output to the demultiplexer 13 and separated into an audio bit stream, a main picture bit stream, and a sub-picture bit stream. Here, video information is included in the main picture bitstream. In addition, subtitle bitstream includes subtitle information.

The sub-picture bitstream is decoded by the text subtitle decoder 15 and the caption information is output to the caption plane 16. The main picture bitstream is decoded by the video decoder 18 and output to the video plane 19. The subtitle plane 16 and the video plane 19 are combined by the plane superimposing unit 17, and the combined video signal is transmitted to the video output circuit 21. The video output circuit 21 performs a process such as converting a digital image signal into an analog image signal, and outputs the synthesized video signal to a display unit (monitor) 40. As a result, the content video is displayed on the display unit (monitor) 40.

Also, the audio bit stream is decoded by the audio decoder 20 and the audio signal is transmitted to the audio output circuit 22. The audio output circuit 22 converts the digital audio signal into an analog audio signal, performs processing such as amplification, and outputs it to the speaker 50. As a result, the audio of the content is output from the speaker 50.

In the drunk possibility detection signal generation unit 30, the GPS receiver 31 receives a transmission radio wave from a GPS artificial satellite, and the own vehicle position detection unit 32 detects the position, speed, traveling direction, etc. of the vehicle. . The parking brake detection unit 33 is connected to the parking brake and detects whether the parking brake is operating. Moreover, the acceleration detection part 34 detects the acceleration added to the front-back, left-right, up-down direction of a vehicle. In addition, the biological information detection unit 35 detects biological information such as shaking of the vehicle occupant's body, the amount of movement of the eyeball, and body temperature. Each information detected by the vehicle position detection unit 32, the acceleration detection unit 34, and the biological information detection unit 35 is transmitted to the drunk environment determination unit 36. The intoxication environment determination unit 36 switches on / off of the intoxication possibility detection signal based on the information detected by each detection unit and transmits the signal.

The caption display control unit 14 of the video / audio control unit 10 is communicably connected to the drunkenness environment determination unit 36. The subtitle display change control is performed based on the possibility of an intoxication detection signal transmitted from the intoxication environment determination unit 36.

Next, the caption display control method of the in-vehicle video display device will be described in detail.
FIG. 2 is a flowchart for explaining the procedure of the caption display control method for the in-vehicle video display apparatus according to the embodiment of the present invention. FIG. 3 is a schematic diagram for explaining a change in subtitle display of the in-vehicle video display device according to the embodiment of the present invention, using a display example of a display unit (monitor). FIG. 4 is a timing chart for explaining an example of timing for changing the caption display of the in-vehicle video display device according to the embodiment of the present invention. FIG. 5 is a timing chart for explaining another timing example of changing the caption display of the in-vehicle video display apparatus according to the embodiment of the present invention.

The procedure of the caption display control method when caption display is selected in the in-vehicle video display device according to the present embodiment will be described.
As shown in FIG. 2, when the subtitle display is selected when starting to view the content (step S <b> 1), for example, the subtitle display as shown in FIG. Step S2). Thereby, the user can view the content displayed on the display unit 40 with captions. Note that the sound is normally played back in the original language of the content.

While the content does not end (step S3: No), while the content is being viewed by subtitle display, it is determined at every certain time whether or not the detection of possibility of motion sickness has been turned on (step S4). ).

When the car sickness detection signal is turned on (step S4: Yes), the display state is changed to a display state without caption display (step S5). For example, the subtitle display is stopped and Japanese voice is output by so-called “dubbing”. As a result, the content displayed on the display unit 40 becomes no subtitle display as shown in FIG. 3B, and the user views by “dubbing”.

Then, while the content is not finished (step S6: No), it is determined whether or not the motion sickness detection signal is turned off at regular intervals while viewing is performed in a display state without caption display. (Step S7).

If the car sickness detection signal is turned off (step S7: Yes), it is determined whether or not the off state has continued for a certain time (Twait) (step S8), and the off state continues for a certain time (Twait). If so (step S8: Yes), as shown in FIG. 4, the subtitle display is changed to “present” (step S9).

As shown in FIG. 5, when the ON / OFF state of the motion sickness detection signal is repeatedly repeated, in the case of times T1, T2, and T3 when the motion sickness detection signal in FIG. 5 is OFF, Since it is shorter than the predetermined time (Twait) (step S8: No), the display state without caption display is maintained in these cases, and the off state continues for a predetermined time (Twait) or more (step S8: Yes). The subtitle display is changed to “Yes”.

Also, as shown in FIGS. 4 and 5, the voice may be changed from dubbing on (Japanese voice) to off (original voice).

Also, immediately before the display state of the subtitle is changed, as shown in FIG. 4 and FIG. By being notified, a sense of incongruity due to a sudden change can be reduced. In addition, instead of a beep sound, an announcement such as “change subtitle display” by words may be used.

In addition, in the case where the sound is changed in Step S5 or Step S9 (from dubbing on to off or from dubbing off to on), after waiting until the content becomes a conversation break or a scene break, The sound may be changed at a break in conversation or a break in scene.

Next, an example in which the vehicle sickness environment determination unit 36 determines whether or not the environment is likely to cause vehicle sickness and outputs ON of the vehicle sickness detection signal will be described in detail.

Example 1
Shaking, vibration, inclination, etc. of the traveling vehicle act on the passenger's body and cause car sickness. In the present embodiment, attention is paid to acceleration or deceleration of the vehicle that causes the above cause. The acceleration detection unit 34 detects the acceleration of the vehicle, and the detected acceleration detection value is transmitted to the drunk environment determination unit 36. When the detection value of the acceleration detection unit 34 exceeds the threshold value within the set measurement unit time, the motion sickness environment determination unit 36 determines that the environment is likely to cause car sickness. Hereinafter, this embodiment will be described in detail.

In the present embodiment, for example, a triaxial acceleration sensor 60 as shown in FIG. The triaxial acceleration sensor 60 can detect accelerations on the X axis (the longitudinal direction of the vehicle), the Y axis (the lateral direction of the vehicle), and the Z axis (the vertical direction of the vehicle). Then, the acceleration detection unit 34 (three-axis acceleration sensor 60) transmits an acceleration output signal of each axis (X, Y, Z) including the detected acceleration detection value to the drunk environment determination unit 36.

The intoxication environment determination unit 36 sets, for example, acceleration threshold values in the positive direction and the negative direction in the detected acceleration values of the respective axes (X, Y, Z). Here, as the threshold value, an acceleration that is rarely detected when traveling on a normal flat pavement is set.

Then, the drunkenness environment determination unit 36 continuously or frequently and intermittently detects the detected value of the acceleration of the X axis, Y axis, or Z axis of the acceleration detection unit 34 (3-axis acceleration sensor 60). When the threshold value is exceeded, the motion sickness detection signal is turned on and output. Alternatively, when the detected value of the acceleration on any of the X axis, the Y axis, and the Z axis exceeds a threshold value, the drunk possibility detection signal may be turned on and output. Alternatively, a threshold value of a condition that appropriately combines the detected acceleration values of the respective axes (X, Y, Z) is set, and when the threshold value is exceeded, the motion sickness detection signal is turned on and output. Also good.

(Example 2)
As an example of the biological information detection unit 35, body shake detection means is used. FIG. 7 is a schematic diagram for explaining the detection of body sway of a vehicle occupant using body sway detection means.
In FIG. 7, the shake detection unit includes a camera 83 and an image analysis unit 84. As shown in FIG. 7, a camera 83 is installed at a position where the passenger 80 of the vehicle can take a picture. For each measurement unit time, the image analysis unit 84 connected to the camera 83 analyzes the captured image, and detects the actual movement of the body (particularly the head) of the passenger 80 relative to the seat. By detecting this movement, the magnitude of shaking actually received by the passenger 80 is measured. The body of the occupant 80 is usually restrained by a seat belt or the like, but the degree of restraint may differ depending on the physique. However, the image analysis unit 84 applies the head reference line for the seat to the image captured by the camera 83. The amount of body shake is detected by measuring the relative displacement amount 82 of 81. The amount of body shake (detected value) is transmitted to the intoxication environment determination unit 36, and the degree of influence of acceleration and vibration of the vehicle on the occupant is known from the amount of body shake. Therefore, when the amount of body shaking exceeds the threshold, the car-driving environment determination unit 36 turns on and outputs the car-sickness detection signal. Here, the threshold value is set to a value that greatly shakes the head or the entire body due to, for example, sudden start, sudden braking, hairpin curve on a saddle road, and rough road driving.

(Example 3)
Next, as an example of the biological information detection unit 35, eyeball movement amount detection means is used. FIG. 8 is a schematic diagram for explaining eyeball movement amount detection using an eyeball movement amount detection means.
The eyeball movement amount detection means includes a camera 83 and an image analysis unit 84, as in the example of FIG. In this embodiment, the camera 83 is installed at a position where the eyes (eyeballs) of the passenger 80 of the vehicle can be photographed. When the eyeball (pupil) is moving finely, it is a condition that induces motion sickness, and thus the movement of the passenger's eyeball is detected as shown in FIG. The image analysis unit 84 analyzes the image photographed by the camera 83, and detects the amount of movement by measuring the position of the eyeball (pupil) from the cross dotted line as shown in FIG. This movement amount (detected value) is transmitted to the drunkenness environment determination unit 36. Then, when the amount of movement of the eyeball exceeds a predetermined amount, the motion sickness determination unit 36 turns on and outputs the motion sickness detection signal.

Example 4
Next, an example in which a passenger's body temperature detection means is used as an example of the biological information detection unit 35 will be described below.
As a passenger's body temperature detecting means in the vehicle, for example, a thermo sensor is installed to measure the surface temperature of the passenger's face. In general, when a car sickness occurs and the patient feels bad, the facial surface temperature tends to decrease, and cold sweat tends to appear. The detected value of the measured surface temperature of the face is transmitted to the car sickness environment determination unit 36. Then, if the amount of change in the surface temperature of the face exceeds the threshold value, the motion sickness environment determination unit 36 turns on and outputs the motion sickness detection signal.
However, since the surface temperature of the face may be lowered by the air blow from the air conditioner or the wind from the outside, these conditions are taken into consideration during the measurement. The body temperature detecting means may be a thermometer attached to the passenger's body.

(Example 5)
The present embodiment is an example in the case where the vehicle is in a specific place as an environment where car sickness is likely to occur. In the present embodiment, the GPS receiver 31 and the vehicle position detection unit 32 are used to detect the current position of the vehicle. For example, a car navigation device can be used as the GPS receiver 31 and the vehicle position detection unit 32. FIG. 9 is a schematic diagram for explaining the present embodiment.
For example, as shown in FIG. 9, the latitude / longitude information of roads (such as roads and bad roads) 100 that are generally known to cause car sickness are empirically stored in advance in the vehicle position detection unit 32 (car navigation system). It is registered in a registration unit (memory or the like) (not shown) in the device or the like. The own vehicle position detection unit 32 compares the current own vehicle position with the position of the road (such as a saddle road / bad road) 100 registered in the registration unit. Detect if you have entered. When it is detected that the vehicle has entered, a detection signal is transmitted to the drunkenness environment determination unit 36. Based on the detection result transmitted from the vehicle position detection unit 32, the vehicle sickness environment determination unit 36 determines that the place is likely to cause vehicle sickness, and outputs a signal for detection of vehicle sickness as ON.

(Example 6)
The present embodiment is an example in which the video of the content being viewed is in an environment where car sickness is likely to occur.
Even when the video of the content being viewed is shaken and vibrated, the inconsistency with the movement of the outside world becomes significant, so that it tends to make the car sick. When a compression codec such as MPEG is being reproduced, an approximate scene motion can be detected by a detection unit (not shown) using a motion vector of the video. When a motion of the image such as vertical vibration or repeated panning is detected, the detected value is transmitted to the drunkenness environment determination unit 36. The motion sickness determination unit 36 determines that the environment is likely to cause car sickness based on the transmitted detection value, and outputs a car motion sickness detection signal as ON.

Further, in the future, 3D content video will become popular in BD and the like. However, for example, viewing a video with a larger parallax than reality (video that emphasizes a sense of depth) may cause a sense of confusion and make you more drunk. . If the difference information between the left-eye image and the right-eye image of the 3D content is extracted and compared by a detection unit (not shown) and the difference is larger than a predetermined value, the detected value is transmitted to the motion sickness environment determination unit 36. Similar to the case where the image is shaken and vibrated, the motion sickness environment determination unit 36 determines that the environment is likely to cause car sickness based on the detection value transmitted from the video information detection unit 23, and may cause motion sickness. The detection signal can be turned on and output.

In addition, the measurement interval for performing each measurement in each of the above-described embodiments is, for example, an interval shorter than the time until the passenger statistically causes car sickness (becomes sick) in an environment in which car sickness is likely to occur. It is desirable (for example, 5 minutes). However, if the measurement interval is too short, a value in response to a temporary disturbance becomes a detected value. Conversely, if the measurement interval is too long, there is a high possibility that the patient will feel unwell before the detected value is transmitted. Since car sickness varies among individuals, it is desirable to be able to adjust the measurement interval.
In addition, in any combination of the first to sixth embodiments described above, the motion sickness environment determination unit 36 determines that the environment is likely to cause motion sickness, and outputs the motion sickness detection signal as ON. It may be.

As described above, the in-vehicle video display device 1 according to the present embodiment easily causes car sickness, the display unit 40 that can display video and subtitles, the subtitle display control unit 14 that controls the display state of the subtitles. An intoxication environment determination unit 36 that determines whether the environment is an environment or not. If the determination by the intoxication environment determination unit 36 determines that the environment is likely to cause intoxication, the caption display control unit 14 Since the display of the display unit 40 is changed to a display state that prevents car sickness, the subtitle display state of the display unit 40 can be changed so as to prevent car sickness in advance.

In addition, the caption display control method of the in-vehicle video display device 1 according to the present embodiment is likely to cause car sickness, the display unit 40 that can display video and captions, the caption display control unit 14 that controls the display state of captions, and the like. An intoxication environment determination unit 36 for determining whether the environment is present or not, and a subtitle display control method for the in-vehicle video display device 1. As a result of determination by the intoxication environment determination unit 36, the environment is likely to cause sickness. When the determination is made, the subtitle display control unit 14 stops the subtitle display on the display unit 40, so that the subtitle display state on the display unit 40 can be stopped so as to prevent car sickness in advance.

In addition, it changes to the state without the subtitle character in the above embodiment (not the state where the subtitle character is not completely displayed), and makes the subtitle character unreadable by blurring or applying a mosaic. Good. In addition, changing the display status is not limited to the presence or absence of subtitle display, but the possibility of car sickness is reduced by changing to a larger size character or changing the color of the character compared to normal subtitle characters. If so, the display state may be changed as described above.

In the above embodiment, the content is a video reproduced from the optical disk drive. However, if the content can be changed in the display state of subtitle characters, the content video is recorded on a hard disk, a semiconductor memory, or the like. The video may be a reproduced video, or may be a broadcast video that has received a broadcast such as 1Seg, or a video that is distributed via a network.

DESCRIPTION OF SYMBOLS 1 In-vehicle video display device 10 Video / audio control unit 11 Optical disk drive 12 Stream buffer 13 Demultiplexer 14 Subtitle display control unit 15 Text subtitle decoder 16 Subtitle plane 17 Plane superposition unit 18 Video decoder 19 Video plane 20 Audio decoder 21 Video output circuit DESCRIPTION OF SYMBOLS 22 Audio | voice output circuit 30 Vehicle drunk possibility detection signal generation part 31 GPS receiver 32 Own vehicle position detection part 33 Parking brake detection part 34 Acceleration detection part 35 Biological information detection part 36 Car drunk environment determination part 40 Display part (monitor)
50 Speaker 60 Three-axis acceleration sensor 70 Part exceeding the upper threshold 80 Vehicle occupant 81 Head reference line 82 Amount of relative displacement 83 Camera 84 Image analysis unit 100 It is empirically found that car sickness is likely to occur. Roads (such as tunnels and bad roads)

Claims

A display unit capable of displaying video and subtitles;
A subtitle display control unit for controlling the subtitle display state;
A car sickness environment determination unit that determines whether or not the environment is likely to cause car sickness;
With
As a result of the determination by the vehicle sickness environment determination unit, when it is determined that the environment is likely to cause vehicle sickness, the display of the display unit is changed to a display state for preventing vehicle sickness by the caption display control unit. An in-vehicle video display device.
The in-vehicle video display device according to claim 1, wherein the display state for preventing the car sickness is a state in which the subtitle display is turned off.
Provided with a speaker that outputs audio along with the display of the video,
3. The display of the display unit is changed to a display state for preventing vehicle sickness by the caption display state control unit, and the sound output from the speaker is changed to a sound of a predetermined language. The in-vehicle video display device described in 1.
When the display of the display unit is in a display state that prevents the car sickness, as a result of the determination by the vehicle sickness environment determination unit, when the state determined that the environment is not likely to cause car sickness continues for a certain period of time The in-vehicle video display device according to any one of claims 1 to 3, wherein a display state for preventing the car sickness is canceled.
The in-vehicle video display device according to any one of claims 1 to 4, further comprising notification means for notifying a change in the display state of the display unit.
An acceleration detector for detecting acceleration applied to the vehicle;
6. The vehicle sickness environment determination unit determines that the environment is likely to cause vehicle sickness when the detection value of the acceleration detection unit exceeds a threshold value. In-vehicle video display device.
A biological information detection unit including a detection means for detecting the shaking of the body of a vehicle occupant,
When the amount of body sway of a vehicle occupant detected by the biological information detection unit exceeds a threshold, the motion sickness environment determination unit determines that the environment is likely to cause motion sickness. The in-vehicle video display device according to any one of claims 1 to 6.
A living body information detecting unit including a detecting means for detecting a movement amount of an eyeball of a vehicle occupant;
When the movement amount of the eyeball of the passenger of the vehicle detected by the biological information detection unit exceeds a predetermined amount, the motion sickness determination unit determines that the environment is likely to cause car sickness. The in-vehicle video display device according to any one of claims 1 to 6.
A biological information detection unit including detection means for detecting the body temperature of a vehicle occupant;
When the amount of change in body temperature of a vehicle occupant detected by the biological information detection unit exceeds a threshold, the motion sickness environment determination unit determines that the environment is likely to cause motion sickness. The in-vehicle video display device according to any one of claims 1 to 6.
A GPS receiver that detects the current position of the vehicle and a vehicle position detector;
10. The vehicle sickness environment determining unit determines that the vehicle is prone to car sickness when the detected current vehicle position is a place where car sickness is likely to occur. The in-vehicle video display device according to claim 1.
When motion of a video in which up and down vibration and / or left and right panning are repeated is detected in the video of the content being viewed, the car sickness environment determination unit determines that the environment is likely to cause car sickness The in-vehicle video display device according to any one of claims 1 to 10, wherein
If the content being viewed is 3D content, and the difference information between the left-eye and right-eye images of the 3D content is extracted and compared, and the difference is greater than a predetermined value, the motion sickness environment determination unit The in-vehicle video display device according to any one of claims 1 to 11, wherein it is determined that the environment is likely to occur.
An in-vehicle video display device comprising: a display unit capable of displaying video and subtitles; a subtitle display control unit that controls a display state of subtitles; and a car sickness environment determination unit that determines whether the environment is likely to cause car sickness. Subtitle display control method,
As a result of the determination by the vehicle sickness environment determination unit, when it is determined that the environment is likely to cause vehicle sickness, the caption display control unit stops displaying captions on the display unit. A subtitle display control method for a video display device.
As a result of the determination by the vehicle sickness environment determination unit, when it is determined that the environment is not likely to cause car sickness, the subtitle display control unit determines whether or not the environment that is not likely to cause car sickness has continued for a certain period of time. 14. The subtitle display control of the in-vehicle video display device according to claim 13, wherein the subtitle is displayed on the display unit when a state that is not an environment in which the car sickness is likely to occur is continued for a predetermined time or longer. Method.