JP2004306792A - Head-up display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display capable of displaying an image of a camera without obstructing driving. <P>SOLUTION: In the head-up display 1, the image taken-in by the camera 4 is displayed on a display part 3 for a driver. The camera 4 takes-in the vertically wide image from the image of the display part 3 and a suspension stroke sensor 5 for detecting inclination of the camera 4 from the state of the vehicle is provided. When the suspension stroke sensor 5 detects the inclination and shaking of the camera 4, an image cut out part 22 for displaying the image with no shaking by deleting a vertical part of the image is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a head-up display for transmitting various information from a vehicle so that a driver views the vehicle without changing the position of the head when driving.
[0002]
[Prior art]
Conventionally, two marks provided at the tip of a vehicle are widely captured so as to enter the inside of the image, and the image is processed so that the positions of the marks are aligned (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-74339 (pages 3-6, FIG. 5)
[0004]
[Problems to be solved by the invention]
However, conventionally, if the mark position of the vehicle is taken into the image, there is no freedom in the installation position of the camera, and in that case, the camera faces slightly downward in the forward direction, so that It was difficult to capture images.
In the head-up display, for example, when an image of a camera is displayed on a windshield, if the image is vertically fluctuated due to a road surface condition or the like, there is a problem that a driver who sees the image is likely to have a motor sickness.
However, there is an increasing need to take pictures of distant places such as night vision with a night vision camera, and displaying the images for safe driving.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a head-up display that can display a camera image without hindering driving.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in a head-up display that displays an image captured by a vehicle-mounted camera to a driver on a display, the vehicle-mounted camera captures a wider image vertically than an image on the display. And camera fluctuation detecting means for detecting the behavior of the camera from the state of the vehicle, and when the camera fluctuation detecting means detects the behavior of the camera, an image cutout means for deleting a part of the top and bottom of the image and displaying a stable image. It is a means characterized by being provided.
[0007]
According to a second aspect of the present invention, the camera fluctuation detecting means includes a vehicle tilt detecting means for detecting a front and rear tilt of the vehicle, and a calculating means for calculating a camera tilt from the vehicle tilt detecting means. did.
[0008]
According to a third aspect of the present invention, the camera fluctuation detecting means includes a shaking detecting means for detecting a shaking of the vehicle, and a calculating means for calculating a vertical movement of the camera from the shaking detecting means.
[0009]
According to the fourth aspect of the present invention, the display device displays the image of the vehicle-mounted camera on the LCD, and displays the image on the windshield using the light projector. The image cutout means changes the vertical synchronization position of the LCD. This is characterized in that the range for cutting out the image is changed.
[0010]
According to a fifth aspect of the present invention, the vehicle-mounted camera is a night vision camera that performs night vision, and is used for a system that contributes to safe driving at night.
[0011]
Function and Effect of the Invention
According to the first aspect of the present invention, when the camera fluctuation detecting means detects the behavior of the camera from the state of the vehicle, the same display as the stable state with no behavior is obtained from the image captured wider than the image displayed by the on-board camera on the display. In order to be able to do so, a wide image is deleted by the image clipping means, and the processed image is displayed. Therefore, the image does not fluctuate due to the state of the road or the like, so that the driver does not look at the image and does not get sick, and the display can be performed so as not to hinder the driving.
[0012]
According to the second aspect of the present invention, the vehicle inclination detecting means detects the inclination of the road such as going up or down, and the inclination before and after due to unevenness of the road surface of the road, and the calculating means calculates the inclination of the camera and cuts out. The image is cut out and displayed according to the inclination of the camera by means. By taking into account the inclination, which is a major cause of the vehicle shaking the image of the camera, a stable display suitable for the state of the vehicle can be reliably performed.
[0013]
According to the third aspect of the invention, the shaking is detected by the shaking detecting means based on the condition of the road surface, the vertical movement of the camera is calculated by the calculating means, and the image is cut out and displayed in accordance with the vertical movement of the camera by the cutout means. I do. By taking into account the shaking which is a major cause of the vehicle shaking the image of the camera, a stable display can be reliably performed according to the state of the vehicle.
[0014]
According to the fourth aspect of the present invention, an image is cut out by moving the display range by changing the vertical synchronization position corresponding to the horizontal resolution of the LCD. As a result, an image can be cut out without complicated control.
[0015]
According to the fifth aspect of the present invention, the night vision image by the night vision camera is displayed as an image without shaking, thereby reliably displaying a pedestrian, an oncoming vehicle, a preceding vehicle, and the like at night, thereby contributing to safe driving at night. Can be used for the system.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments for realizing the head-up display of the present invention will be described based on embodiments corresponding to the first, second, third, and fourth aspects of the present invention.
[0017]
(Example)
[0018]
First, the configuration will be described.
FIG. 1 is a system block diagram of the head-up display of the embodiment. FIG. 2 is an explanatory diagram of the head-up display of the embodiment. FIG. 3 is a flowchart illustrating a flow of a process executed by the display circuit unit of the head-up display according to the embodiment. FIG. 4 is an explanatory diagram illustrating a display example of the head-up display of the embodiment. 1 to 4, 1 is a head-up display, 2 is a display circuit unit, 21 is a captured image input unit, 22 is an image cutout unit, 23 is a timing control unit, and 24 is an arithmetic circuit unit (operation Means, 3 is a display unit (display, which includes an LCD), 31 is a light source, 32 is an LCD, 33 is a mirror, 4 is a camera (night vision camera), 5 is a suspension stroke sensor (camera fluctuation detection) , 61 is an input image from a camera, 621 is a clipped image area, 622 is a deleted area, 63 is a display image, 7 is a windshield, and A1 is a running image. A line of sight when looking outside, A2 is a line of sight when looking at the head-up display, and h is a person.
[0019]
The head-up display 1 according to the present embodiment includes a display unit 3 and a display circuit unit 2. As shown in FIG. 2, light is emitted from a light source 31 to an LCD 32, and an image displayed on the LCD 32 is reflected by a mirror 33. The virtual image is displayed on the windshield. The light source 31, the LCD 32, and the mirror 33 are referred to as a display unit 3.
The dot configuration of the LCD 32 used in this embodiment is 100 dots vertically, the camera 4 captures and outputs an image of 240 horizontal effective scanning lines, and the LCD 32 displays an image corresponding to 100 of them. Shall be.
Further, although not shown, the vehicle equipped with the head-up display 1 of the present embodiment controls the suspension stroke of each wheel to improve comfort. Therefore, the condition of the road surface and the vehicle can be known from the control content and the stroke of each suspension.
The display circuit section 2 for controlling the display of the display section 3 is provided with a photographed image input section 21 for taking in an image from the camera 4 into the display circuit section 2, and inputs a signal of the suspension stroke sensor 5 of each suspension to the vehicle. An arithmetic circuit unit 24 for calculating the vertical swing and tilt of the image is provided, and an image extracting unit 22 for extracting an image input to the captured image input unit 21 from the calculation result of the arithmetic circuit unit 24 is provided. A timing control unit 23 for controlling the timing at which the displayed image is displayed on the display unit 3 is provided.
[0020]
The camera 4 mounted on the vehicle of the present embodiment is a camera 4 that can perform night vision even in dark nights, and provides night vision for oncoming vehicles and pedestrians to be reflected on the windshield to show driving safety. It is to improve.
[0021]
Next, the operation will be described.
[0022]
[Image cutting display operation by display circuit section]
FIG. 3 is a flowchart showing the flow of processing executed by the display circuit unit 2 of the head-up display 1 according to the embodiment. Each step will be described below.
[0023]
In step S1, the arithmetic circuit unit 24 inputs the output value of the suspension stroke sensor 5.
[0024]
In step S2, it is determined whether or not there is a change in the stroke stroke sensor value. If there is a change, the process proceeds to step S5, and if there is no change, the process proceeds to step S3.
[0025]
In step S3, the image cutout unit 22 cuts out the normal position, that is, the center of the captured image.
[0026]
In step S <b> 4, the display start position for each horizontal scanning line is determined according to the cutout position of the image cutout unit 22, and the display is performed at the timing controlled by the timing control unit 23.
[0027]
In step S5, the inclination / up / down movement of the vehicle is calculated by the arithmetic circuit unit 24 from the change amount of the output value of the suspension stroke sensor 5 input to the arithmetic circuit unit 24.
[0028]
In step S6, the arithmetic circuit unit 24 further converts the tilt / up / down movement of the vehicle calculated in step S5 into a moving amount of an image captured by the camera 4.
[0029]
In step S7, the image cutout unit 22 calculates which part is to be a cutout image area and which part is to be a deletion area in accordance with the movement amount of the camera 4 calculated by the arithmetic circuit unit 24.
[0030]
In step S8, the start position of the horizontal scanning line is corrected so that the clipped image area calculated in step S7 can be displayed.
[0031]
[Prevents car sickness]
In the present embodiment, the up / down movement due to the inclination or shaking of the vehicle is detected from the stroke of the suspension based on the output value of the suspension stroke sensor 5.
In a state where there is no tilt or shaking, the processing is performed in the flow from step S2 to step S3 and step S4 in the flowchart of FIG. 3, and as shown in FIG. Then, the center portion is cut out and displayed. That is, in the present embodiment, the camera 4 captures an image of 240 horizontal effective scanning lines, and the LCD 32 having a dot configuration of 100 dots cuts out an image corresponding to 100 lines out of the image and displays it as an image area 621. Become. Therefore, a deletion area 622 corresponding to 70 horizontal effective scanning lines is provided at each of the upper and lower sides.
[0032]
If the vertical movement due to the inclination or shaking of the vehicle is detected, the processing is performed in the flow of FIG. 3 in the order of steps S2 to S5 → S6 → S7 → S8 → S4.
For example, as shown in FIG. 4B, when the vehicle moves upward due to shaking, or when the vehicle is inclined so as to lower the front, and the person moves to the lower part of the input image 61 captured by the camera 4, Calculates that the camera 4 captures an image in this way from the upward movement of the vehicle or the inclination that the front becomes low, the upper part of the image is set as the deletion area 622, and the lower part of the image is cut out and the image area 621 is cut out. And Then, as is clear from the comparison between FIGS. 4A and 4B, the display image 63 is an image without fluctuation.
Therefore, since the image displayed as a virtual image on the windshield does not fluctuate up and down to the outside where the driver is looking through the windshield as a unity with the car, it is possible for the driver to get sick. To prevent.
[0033]
[Action to detect vehicle tilt and shaking]
In this embodiment, the suspension stroke sensor 5 detects the stroke controlled by a suspension provided on each wheel, thereby determining the vertical movement of the vehicle due to the tilt and swing. Therefore, it is possible to make a determination based on the information from the vehicle device without providing a special device, and it is possible to perform a favorable display while suppressing a major cause of the image 4 shake of the camera 4.
[0034]
[Easy control]
Since the display of the cut-out image is performed by determining the vertical synchronization position, the control is not difficult, and the image is easy to use.
[0035]
[Improvement of safety at night]
Since the camera 4 of this embodiment is a camera 4 for night vision, a pedestrian or an oncoming vehicle, which is difficult to see at night, is projected on the windshield to show sufficient information even in the dark. Use caution to improve nighttime driving safety.
[0036]
Next, effects will be described.
[0037]
In the head-up display 1 of the embodiment, the following effects can be obtained.
[0038]
(1) In the head-up display 1 for displaying the image captured by the camera 4 to the driver on the display unit 3, the camera 4 captures an image that is wider than the image on the display unit 3 up and down. Since the suspension stroke sensor 5 for detecting the behavior is provided, and the suspension stroke sensor 5 detects the behavior of the camera 4, the upper and lower parts of the image are deleted and the image cutout unit 22 for displaying a stable image is provided. The display can be performed so that the driver does not get sick when viewing the image and does not hinder driving.
[0039]
(2) Since the camera fluctuation detecting means includes the suspension stroke sensor 5 for detecting the inclination of the front and rear of the vehicle, and the arithmetic circuit unit 24 for calculating the inclination of the camera 4 from the suspension stroke sensor 5, it is ensured that the condition of the vehicle is adjusted. It is possible to display without fluctuation.
[0040]
(3) Since the camera fluctuation detecting means is composed of the suspension stroke sensor 5 for detecting the shake of the vehicle and the arithmetic circuit unit 24 for calculating the vertical movement of the camera 4 from the suspension stroke sensor 5, it is ensured that the condition of the vehicle is matched. A display without shaking can be performed.
[0041]
(4) The display unit 3 displays the image of the camera 4 on the LCD 32, and displays the image on the windshield with the projector, and the image cutout unit 22 cuts out the image by changing the vertical synchronization position of the LCD32. Since the range is changed, it is possible to cut out an image without complicated control.
[0042]
(5) The camera 4 is a night vision camera that performs night vision and is used in a system that contributes to safe driving at night, so that pedestrians, oncoming vehicles, preceding vehicles, etc. are reliably displayed at night and safe driving at night. Can be used for systems that contribute to
[0043]
As described above, the head-up display of the present invention has been described based on the embodiments. However, the specific configuration is not limited to these embodiments, and the gist of the invention according to each claim in the claims is described. Changes and additions to the design are permitted as long as they do not deviate.
[0044]
For example, in the embodiment, the suspension stroke sensor is shown as the camera fluctuation detecting unit, the vehicle tilt detecting unit, and the shaking detecting unit. However, road information from a vehicle tilt sensor, an acceleration sensor, or a car navigation device may be used.
In the embodiment, the image is displayed on the windshield. However, the image may be displayed on a separate translucent combiner.
Further, in the embodiment, the camera that performs night vision is shown as the on-vehicle camera. However, a camera other than a night vision camera may be used.
[Brief description of the drawings]
FIG. 1 is a system block diagram of a head-up display according to an embodiment.
FIG. 2 is an explanatory diagram of a head-up display according to an embodiment.
FIG. 3 is a flowchart illustrating a flow of a process executed by a display circuit unit of the head-up display according to the embodiment.
FIG. 4 is an explanatory diagram illustrating a display example of a head-up display according to the embodiment.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 head-up display 2 display circuit unit 21 photographed image input unit 22 image cutout unit 23 timing control unit 24 arithmetic circuit unit 3 display unit 31 light source 32 LCD
33 Mirror 4 Camera 5 Suspension stroke sensor 61 Input image 621 from camera Cutout image area 622 Deletion area 63 Display image 7 Windshield A1 (when looking outside while driving) Gaze A2 (when looking at head-up display) h people

Claims (5)

In a head-up display that displays the image captured by the in-vehicle camera to the driver on the display,
The in-vehicle camera captures an image vertically larger than the image of the display,
A camera fluctuation detecting means for detecting the behavior of the camera from the state of the vehicle is provided. When the camera fluctuation detecting means detects the behavior of the camera, an image cutout means for deleting a part of the upper and lower parts of the image and displaying a stable image is provided. A head-up display characterized by the following. 2. The head-up display according to claim 1, wherein the camera fluctuation detecting means includes a vehicle tilt detecting means for detecting a front and rear tilt of the vehicle, and a calculating means for calculating a camera tilt from the vehicle tilt detecting means. Features a head-up display. In the head-up display according to claim 1 or claim 2,
A head-up display, wherein the camera fluctuation detecting means comprises a shaking detecting means for detecting shaking of the vehicle, and a calculating means for calculating a vertical movement of the camera from the shaking detecting means. In the head-up display according to claims 1 to 3,
The display displays the image of the vehicle-mounted camera on the LCD, and displays the image on the windshield with the projector, and the image cutout means changes the vertical synchronization position of the LCD to change the range where the image is cut out. A head-up display characterized by: In the head-up display according to claims 1 to 4,
A head-up display, wherein the on-vehicle camera is a night vision camera that performs night vision and is used in a system that contributes to safe driving at night.

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