JP2007006006A - In-vehicle information display device and vehicle information display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make sure in a short time the presence or absence of another vehicle behind or behind the host vehicle and the direction and distance of the other vehicle.
When a direction and distance of another vehicle existing behind the host vehicle is detected by a rear / rear side monitoring device 1 and a display pattern is displayed in a driver's peripheral vision part, an image control unit 2 The display position of the display pattern in the horizontal direction is determined based on the direction of the other vehicle relative to the host vehicle, and the size of the display pattern is determined based on the distance from the host vehicle to the other vehicle. The image control unit 2 generates a low spatial frequency image having a determined display pattern size and excluding a spatial frequency component from which the brightness contrast sensitivity of the driver can be obtained only by central vision, and the low spatial frequency image Is displayed at the display position of the display pattern in the horizontal direction.
[Selection] Figure 3

Description

  The present invention relates to an in-vehicle information display device and a vehicle information display method for transmitting various types of information to a driver of a vehicle working in a predetermined direction.

  In general, in order to know the situation of the rear and rear side of the host vehicle while driving the vehicle, before confirming the line of sight toward the rear and rear side of the host vehicle, Move the line of sight to the door mirror or room mirror and check. Thus, visually recognizing the situation behind and behind the host vehicle through the mirror has the following problems (1) to (3).

  (1) There is an area (a blind spot) that cannot be seen through the door mirror and the room mirror.

  (2) The appearance of the outside world through the mirror is greatly affected by various conditions such as weather, time, background scenery, size of the rear and rear side of other vehicles and body color, etc. May be stable.

  (3) In order to see the mirror, it is necessary to move the line of sight from the foreground to the mirror, and it is impossible to visually recognize the front over a period of several seconds.

  In contrast, conventionally, as described in Patent Document 1 below, when the rear and rear sides are monitored by an in-vehicle camera or radar, and the presence of another vehicle approaching the host vehicle is detected. Is informing the situation that the other vehicle should be alerted. As such a notification method, for example, the presence of an approaching other vehicle is notified by a buzzer sound, or the other vehicle in the camera image obtained by imaging the rear and rear sides is marked and notified. Things.

Patent Document 2 also calculates the distance from the host vehicle to the following vehicle from camera images obtained by imaging the rear and rear sides, and the brightness, presentation time, and presentation interval of the camera image according to the distance. A technique for controlling the notification intensity by changing the above is described.
Japanese Patent Laid-Open No. 11-32494 JP 2004-310489 A

  However, the technologies described in Patent Document 1 and Patent Document 2 described above mainly provide a warning about the surrounding situation of the host vehicle by presenting the blind spot area of the driver listed in the above problem (1). It is intended to present. That is, in the techniques described in Patent Document 1 and Patent Document 2 described above, attention is paid to a blind spot area by a camera image, and the grasp of the surrounding situation is not improved. Therefore, in Patent Document 1 and Patent Document 2 described above, the basic problem of reliably grasping the presence of other vehicles in the rear and the rear side by looking at the mirror, and the problem (2) described above. It is not intended to improve the problem that the visibility of the vehicle becomes unstable, and that the other vehicles on the rear and rear sides cannot be reliably confirmed in the short time of the problem (3).

  Therefore, the present invention has been proposed in view of the above-described circumstances, and can accurately and quickly grasp the presence / absence of another vehicle behind or behind the host vehicle and the direction and distance of the other vehicle. An object is to provide an in-vehicle information display device and a vehicle information display method.

  The present invention detects a direction and a distance of another vehicle existing behind the host vehicle in order to convey information by presenting an image to the driver of the host vehicle, and a predetermined foreground range that the driver can visually recognize. When the display pattern is displayed at the display position in the range excluding the center range of the predetermined foreground, the display position of the display pattern in the horizontal direction is determined based on the detected direction of the other vehicle with respect to the own vehicle. Determining the size of the display pattern based on the distance from the detected vehicle to the other vehicle, and having the determined display pattern size, and the brightness contrast of the driver only in the predetermined foreground range A low spatial frequency image excluding the spatial frequency component from which the sensitivity is obtained is generated, and the display position of the display pattern in the determined horizontal direction is selected from the low spatial frequency image. By displaying, to solve the problems described above.

  According to the present invention, the display position in the horizontal direction of the display pattern is adjusted based on the direction of the other vehicle relative to the own vehicle, and the size of the display pattern is adjusted based on the distance between the own vehicle and the other vehicle. It is possible to ascertain in a short time whether the other vehicle is located behind the host vehicle.

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

  According to the present invention, in order to transmit information by presenting an image to a driver of a vehicle as an observer, a predetermined foreground range that can be visually recognized by the driver (for example, an eccentric angle of 5). A low spatial frequency image excluding the spatial frequency component that can obtain the brightness contrast sensitivity of the driver only in a predetermined central range, or an image including a high frequency component as necessary. It is applied to an in-vehicle information display device that displays and displays information transmitted to the driver.

  In this in-vehicle information display device, information transmitted to the driver is the presence / absence of another vehicle behind and behind the host vehicle that the driver wants to check, and the direction and distance to the host vehicle when the other vehicle exists.

[Principle used in in-vehicle information display devices]
First, before describing the configuration of an in-vehicle information display device to which the present invention is applied, the principle used in the in-vehicle information display device will be described.

  The vehicle-mounted information display device creates a blurred low spatial frequency image when displaying a display image on the driver's front window. At this time, the in-vehicle information display device quantitatively controls the degree of blurring of the video. This blurring condition can be realized by removing, from the image, a frequency component higher than a predetermined spatial frequency among various spatial frequency components included in a certain image. The spatial frequency serving as a reference for the degree of blurring is called a cut-off spatial frequency, and a low spatial frequency image is generated by removing a spatial frequency component higher than the cut-off frequency from the image. In other words, the lower the cutoff spatial frequency is set, the more spatial frequency components are higher than the cutoff frequency to be removed, and the degree of blurring of the displayed image becomes larger. By controlling the cutoff frequency, it is quantitatively blurred. The condition can be adjusted.

  The in-vehicle information display device has a spatial frequency at which the contrast sensitivity of the observer can be obtained in the peripheral region of the visual field excluding the center range of the predetermined foreground, and has a spatial frequency without a spatial edge. A low spatial frequency image that is an image composed of a range of frequency components is generated and displayed.

  In the in-vehicle information display device, in order to remove the spatial frequency component that is visible only in the center region (10 degrees of visual field center) of the predetermined visual field range that is the foreground of the driver, Assuming .7, the cutoff spatial frequency is about 5.23 CPD. The reason why the driver's visual acuity is set to 0.7 and the cutoff frequency is set to 5.23 CPD will be described.

  In general, a region having a high spatial resolution called central vision in the center range in front of the driver is regarded as a region having a diameter of 5 degrees at the center of the visual field, but from the distribution of visual acuity as shown in FIG. The center area of the visual field having a relatively high visual acuity is an area having a diameter of 10 degrees.

  FIG. 1 shows, for each spatial frequency, a visual field range having a luminance contrast sensitivity of 10% or more with respect to the maximum luminance contrast sensitivity when the time frequency is 0.57 Hz. The characteristics shown in FIG. 1 are obtained by measuring the luminance contrast sensitivity of each part of the visual field as a function of the spatial frequency when a display image having a temporal frequency of 0.57 Hz is visually recognized. The range in which the brightness contrast sensitivity is 10% or more of the maximum value of the brightness contrast sensitivity is shown. The vertical axis and horizontal axis in FIG. 1 correspond to the vertical axis and horizontal axis of the visual field and represent the eccentric angle. In addition, the numerical value of the spatial frequency in FIG. 1 is a value when the spatial frequency Fa that can be visually recognized by the driver corresponding to the visual acuity Va of central vision (the reciprocal of the minimum separation value marked by the visual angle) is 1. .

  Here, since the spatial frequency Fa = 30 Va (Visual Acuiy: visual acuity), when the visual acuity is 0.7, the spatial frequency Fa = 21 cpd (cycles per degree) that the driver can visually recognize. In addition, when the numerical value in FIG. 1 is 0.025, for example, it represents 0.025 × 21 = 0.53 cpd. Further, the change in the visual field range shown in FIG. 1 is also based on the actual measurement value with respect to the change in the visual field range by the subject, and for an azimuth having no actual measurement value, an ellipse is regressed between adjacent azimuths.

  As can be seen from FIG. 1, the range in which the contrast sensitivity of 10% or more is obtained in the upward visual field is narrow. From FIG. 1, the visual field range that can be visually recognized with respect to the spatial frequency can be estimated. Thus, the viewing range in which a luminance contrast sensitivity of 10% or more is obtained varies depending on the condition of the spatial frequency (8.40 CPD to 0.53 CPD).

  As shown in FIG. 1, the change of the spatial resolution depending on the field of view varies depending on the direction of the field of view (up / down / left / right), but from the left / right direction among the left / right direction and the lower direction where the driver often pays attention during driving. The lower cut-off spatial frequency having a low spatial resolution at an eccentric angle of 5 degrees can be obtained by the following equation 1. Note that the lower the resolution is, the lower the resolution is because the greater the degree of blur, the less likely it is to induce a focus adjustment response.

Fs = 0.040039−0.092879 × ln (−ln (1-S)) (Formula 1)
In Equation 1, the first term and the second term on the right side are fitting coefficients, ln is a common logarithm, and the luminance contrast sensitivity S is 0.1 indicating the luminance contrast sensitivity of 10% of the peak of the maximum luminance contrast sensitivity. Since this spatial frequency is standardized by the central visual acuity Va, the spatial frequency F in a normal unit (cycles / deg: CPD) is
F = Fs × 30 × Va (Formula 2)
It is calculated by the following equation. Here, since the minimum visual acuity of the driver can be regarded as 0.7 from the license acquisition condition, the cutoff spatial frequency F is set to 5.23 CPD.

  In this way, the in-vehicle information display device acquires the driver's visual acuity value, and the higher the acquired visual acuity value, the higher the spatial frequency component at which the brightness contrast sensitivity of the driver can be obtained only in a predetermined central range. Thus, it is possible to create a low spatial frequency image excluding a spatial frequency component equal to or higher than the spatial frequency.

  FIG. 2 shows a result of estimating for each spatial frequency how the eccentric angle, which is a visible range in which a luminance contrast sensitivity of 10% or more can be obtained, is changed by the change of the time frequency. In FIG. 2, the horizontal axis is the time frequency, and the vertical axis is the eccentric angle. From FIG. 2, it can be seen that the eccentric angle at which contrast sensitivity is obtained increases as the spatial frequency decreases, and the optimum temporal frequency corresponding to the peak value of the eccentric angle tends to increase as the spatial frequency decreases. The peak value of the eccentric angle exists in the range of about 1 to 3 Hz of the time frequency.

  In FIG. 2, 0.55 to 5 in a range corresponding to the range of 1 to 3 Hz to ± 0.5 logunit, which is the optimum time frequency at which the eccentric angle from the central visual field of the driver with which brightness contrast sensitivity is obtained is the widest. .47 Hz can be defined as a time frequency range in which the visual system has a stable sensitivity. Therefore, the in-vehicle information display device starts up the luminance contrast when starting or stopping displaying an image having a spatial frequency lower than the cut-off frequency for the visual acuity determined as described above in an arbitrary part of the driver's visual field range. Alternatively, the falling change is performed over a period of 91 to 909 msec corresponding to 0.55 to 5.47 Hz. Thereby, even if the display of the display image is started or stopped, the line of sight is not induced.

  In this way, the in-vehicle information display device makes it possible to grasp the direction and distance of the other vehicle with respect to the host vehicle while displaying the display image of the low spatial frequency, and at the time of starting and stopping the display of the display image, The rising and falling of the brightness contrast are gradually raised and lowered to avoid the appearance or disappearance of the display image intermittently.

[Specific configuration of in-vehicle information display device]
Next, the display pattern which is a low spatial frequency image as described above is displayed, and the time frequency of the rise and fall of the luminance contrast at the start and stop of display of the display image is controlled, and the vehicle The structure of the specific vehicle-mounted information display apparatus which transmits the information which grasps | ascertains the other vehicle of back and back side of a vehicle to a driver | operator is demonstrated.

  This in-vehicle information display device is based on a rear / rear side monitoring device 1 that acquires information representing the rear and rear side conditions of the host vehicle, information from the rear / rear side monitoring device 1 and a vehicle speed signal. An image control unit 2 that controls the display pattern to be displayed, an image generation unit 3 that generates a display pattern to be displayed according to the control of the image control unit 2, and a display that allows the predetermined range to grasp the rear and rear side conditions of the host vehicle A display unit 4 for displaying a pattern is provided.

  The rear / rear side monitoring device 1 includes a sensor such as an ultrasonic sensor, a laser radar sensor, or an infrared camera, and detects other vehicles from the sensor output. Then, when the other vehicle is detected within a predetermined range such as several tens of meters from the own vehicle, the rear / rear side monitoring device 1 obtains the direction (angle) of the other vehicle and the distance of the other vehicle. Further, when there are a plurality of other vehicles detected in the predetermined range, the rear / rear side monitoring device 1 obtains the direction and distance for each other vehicle. In this way, the direction information and distance information of the other vehicle with respect to the host vehicle obtained by the rear / rear side monitoring device 1 are supplied to the image control unit 2.

  The image control unit 2 inputs a vehicle speed signal of a host vehicle from a vehicle speed sensor (not shown), and inputs direction information and distance information of another vehicle from the rear / rear side monitoring device 1. This image control part 2 calculates | requires the range of the back and back side of the own vehicle displayed on the display part 4 from a vehicle speed signal. At this time, the image control unit 2 determines the rear and rear side ranges so as to display other vehicles existing at a farther distance as the vehicle speed signal is higher. Thereby, the image control part 2 determines the display range of the other vehicle shown to a driver | operator.

  In addition, when the image control unit 2 determines the rear and rear side ranges for displaying other vehicles, the other vehicles detected by the rear / rear side monitoring device 1 are within the rear and rear side ranges. Determine if it exists. And when it determines with other vehicles existing in the range of back and rear side, while determining the horizontal x coordinate in the display field which displays a display pattern from the direction information on the other vehicles, The size of the display pattern is determined from the distance. Specifically, when there is another vehicle in the direction of the right rear side of the host vehicle and relatively close to the host vehicle, x coordinate information for displaying a display pattern on the right side of the display area; Then, display parameters including display size information with a large display area are output to the image generation unit 3.

  When the display parameter is supplied from the image control unit 2, the image generation unit 3 generates a display pattern that is a low spatial frequency image of the display size from the display size information included in the display parameter. Thereby, the image generation part 3 produces | generates a display pattern with large display size, so that the distance of the own vehicle and another vehicle is near. In addition, the image generation unit 3 receives the display size information that is closer than the distance between the predetermined host vehicle and the other vehicle, or the host vehicle detected by the rear / rear side monitoring device 1 and the other When the distance from the vehicle is smaller than the predetermined distance, a display pattern including a high frequency component may be generated instead of a low spatial frequency image, or a display pattern with a display color as an emphasized color may be generated. .

  As described above, the display unit 4 displays a display pattern at a display position in a range excluding the center range of the predetermined foreground among the predetermined foreground range that can be visually recognized by the driver. The display unit 4 inputs the display pattern generated by the image generation unit 3, and displays the display pattern within a predetermined foreground range when the driver of the front window in the foreground of the driver is looking at the foreground. A range excluding a predetermined center range of the foreground (for example, a region within an eccentric angle of 5 degrees) is displayed as a display position. Here, when the display pattern is a low spatial frequency image, the spatial frequency component from which the brightness contrast sensitivity of the driver is obtained only in a predetermined center range is removed.

  That is, the display unit 4 avoids a standard position when the driver looks at the foreground and minimizes the effect of shielding the driver's foreground when the display pattern is displayed. A display pattern including an intersection shape and a traveling direction is displayed in a region having an eccentric angle of 5 degrees or more from the central viewpoint, which is in the vicinity of the center position.

  As shown in FIG. 4, the display unit 4 includes a liquid crystal display 103 located in the instrument panel 102 and below the front window 101, and the front window 101 location on which the video from the liquid crystal display 103 is projected. It is a half mirror part 101a.

  The half mirror portion 101a is formed in a horizontally long and rectangular shape at the lower portion of the front window 101 at a position that is visible at a predetermined distance from a standard eye point (center viewpoint) when the driver is seated on the seat. Has been. The half mirror unit 101a has a function as a neutral filter that attenuates light from outside the vehicle and a function as a mirror that increases the reflection efficiency of display image light. Further, the half mirror portion 101a is formed at a position where the display image light from the liquid crystal display 103 is reflected to the driver's eye point.

  In such a liquid crystal display 103, when the driver visually recognizes the display image 100, the display pattern in which the spatial frequency is set as described above is supplied from the image generation unit 3, and the display light representing the display pattern is emitted. .

  As another example of the display unit 4, as shown in FIG. 6, a projector 104 that emits display image light is provided in the instrument panel 102, and the display image light emitted from the projector 104 is transmitted to the front window 101. It may be configured to project onto the transparent screen portion 101b formed in the above. The transparent screen portion 101b is a region having a diffusibility that does not impair the foreground visibility by the driver.

  As a result, the display unit 4 displays the display position on the front window 101 that is about 10 degrees away from the predetermined center range that is in front of the driver, according to the direction of the other vehicle that is behind and behind the host vehicle. Can be displayed, and a display pattern whose size is adjusted according to the distance from the other vehicle can be displayed.

  Next, a display example in which the directions and distances of other vehicles existing behind and behind the host vehicle are displayed by the on-vehicle information display device configured as described above will be described.

  As shown in FIGS. 6A to 6C, the display unit 4 displays a horizontally long display area, and the direction of the other vehicle with respect to the host vehicle depending on the display position of the display pattern 10 in the horizontal direction of the display area. Present. Both ends of the horizontally long display area are determined by a range in the horizontal direction set as a detection range of the other vehicle of the rear / rear side monitoring device 1.

  For example, in the case of the rear / rear side monitoring device 1 that detects a right rear 60 degree range and a left rear 60 degree range with respect to the center in the rear width direction of the host vehicle (travel center direction) By displaying the display pattern 10 at the right end, it can be shown that there is another vehicle at the 60 ° position on the right rear side.

  When displaying the direction of another vehicle that travels directly behind the host vehicle in the same lane as the host vehicle, the display pattern 10 is displayed in the travel center direction in FIGS. For example, in the case of displaying the direction of the other vehicle traveling on the rear side of the host vehicle in the left lane of the host vehicle, from the center position in the horizontal direction of the display area indicating the traveling center direction shown in FIG. The display pattern 10 is displayed at a position shifted leftward. Further, for example, when displaying the direction of another vehicle traveling on the rear side of the host vehicle in the right lane of the host vehicle, the display region shown in FIG. The display pattern 10 ′ is displayed at the shifted position.

  In addition, the display pattern 10 has a larger area as the other vehicle whose distance from the host vehicle is closer is presented. Here, the minimum area and the maximum area of the display pattern 10 are set by the image control unit 2. For example, when the distance between the host vehicle and the other vehicle is about 50 meters in order to pay attention to the other vehicle, the display pattern 10 of the minimum area is displayed, and the inter-vehicle distance to be warned to the driver or the vehicle speed of the host vehicle is displayed. Accordingly, the inter-vehicle distance to be alarmed is set to 1 to 2 meters, and the display pattern 10 of the maximum area is displayed when the scene becomes the inter-vehicle distance. Further, the change in the distance between the host vehicle and the other vehicle and the change in the area of the display pattern 10 may be linear or may be a tangent function as when the other vehicle is actually visually recognized by a mirror. .

  Note that the display patterns 10 and 10 ′ in FIGS. 6A and 6B are stain patterns whose luminance changes according to the two-dimensional Gaussian distribution, but other display patterns may be used as long as they do not include a high spatial frequency component. It may be a display pattern consisting of a luminance distribution. As described above, the in-vehicle information display device sets the display area of the display unit 4 in the peripheral portion of the visual field excluding the predetermined range in the driver's foreground, and the position of the display pattern 10 without moving the line of sight and gazing. The display pattern 10 which can visually recognize the change and the size change and does not include the high spatial frequency component is displayed. Thereby, the presence of other vehicles in the rear and rear sides can be notified without inducing the driver's line-of-sight movement.

  Furthermore, this in-vehicle information display device detects, for example, the presence of another vehicle that needs to be presented and understood to the driver urgently, for example, the distance between the host vehicle and the other vehicle is about 1 to 2 meters. Is changed to a display pattern 10 ″ including a high spatial frequency component as shown in FIG. Thereby, the alertness of the display pattern 10 ″ can be improved and a warning can be notified. In addition to the case where the display pattern 10 ″ includes a high spatial frequency component, the display color of the display pattern 10 ″ may be changed to an emphasized color such as red or yellow.

  Further, as other display examples for enhancing the attractiveness of the display pattern in the in-vehicle information display device, there are shapes such as a display pattern that moves in a wavy shape in FIG. 7A and a display pattern that moves in a wavy shape in FIG. Two different display patterns are alternately switched in a short cycle such as several seconds. Here, the display pattern moving in a wave shape is an image updated so that a wave flows at a predetermined time frequency.

  Further, as shown in FIGS. 7A and 7B, display patterns having different shapes may be alternately displayed, and at the same time, the display color may be changed to a highly attractive display color.

  Furthermore, as another display example for enhancing the attractiveness of the display pattern in the in-vehicle information display device, for example, in the range where the distance between the own vehicle and the other vehicle is several tens of meters, the display size is as shown in FIG. The display pattern 11 of the luminance change according to the small two-dimensional Gaussian distribution is displayed, and when the distance between the host vehicle and the other vehicle gradually decreases, the display size of the display pattern 11 ′ is increased as shown in FIG. Further, when the distance between the host vehicle and the other vehicle is close and it is understood that the vehicle is urgent, a wavy display pattern 11 ″ is displayed as shown in FIG.

[Effect of the embodiment]
As described above in detail, according to the in-vehicle information display device to which the present invention is applied, the display position of the display pattern in the horizontal direction is adjusted based on the direction of the other vehicle detected by the rear / rear side monitoring device 1. In addition, by adjusting the size of the display pattern based on the distance to the other vehicle, it is possible to reliably and quickly grasp where the other vehicle is located behind and behind the host vehicle. it can.

  That is, according to this in-vehicle information display device, the appearance of the outside world through the vehicle mirror is greatly dependent on various conditions such as weather, time, background scenery, the size of the other vehicle on the rear and rear sides, and the color of the vehicle body. Even if the visibility may become unstable due to the influence, the other vehicle detected by the rear / rear side monitoring device 1 is made to grasp the direction of the other vehicle at the display position in the horizontal direction, and the display size. Can grasp the distance to other vehicles. Thus, by visually recognizing the display pattern and grasping the direction and distance of the other vehicle in advance by the display pattern, the other vehicle can be reliably and shortly seen even when the visibility of the other vehicle through the short-time mirror is poor. It can be grasped by time.

  In addition, in order to grasp the direction and distance of other vehicles on the rear and rear sides, it is necessary to move the line of sight from the foreground to the mirror, and it is impossible to see the front over a period of several seconds. By grasping the direction and the distance of the other vehicle by means of this, it is possible to grasp the other vehicle only by visually recognizing the mirror for a short time.

  Furthermore, since the direction and distance of the other vehicle can be grasped only by adjusting the display position and the display size in the horizontal direction of the display pattern, in order to grasp the direction and distance of the other vehicle in a short time and surely. There is no need to use advanced image processing techniques.

  Note that the movement of the display pattern in the horizontal direction and the change in the display size are the same as the way the other vehicle is seen through the mirror, and it is not necessary to learn how to view the display pattern. Further, as a visual characteristic of the peripheral portion of the visual field, there is a general property that the sensitivity to the moving object is higher than the stationary object, but the other vehicle that is relatively stationary with respect to the own vehicle, that is, the own vehicle Compared to other vehicles moving at the same speed as the own vehicle while maintaining a certain distance, other vehicles moving relative to the own vehicle, that is, other vehicles accelerating to pass Other vehicles, whose distance is being shortened, are compatible with the potential need for warning.

  Further, according to this vehicle information display device, the spatial frequency range in which the contrast sensitivity of the observer can be obtained in the peripheral region of the visual field with respect to the peripheral region of the driver, and there is no spatial edge. Since the low spatial frequency image consisting of the frequency components is displayed as a display pattern, the size of the display pattern representing other vehicles and the change in the position of the horizontal dimension can be grasped even in the periphery of the visual field, and the line of sight Do not induce. Accordingly, even if the driver does not move his / her line of sight from the foreground to the display area, the behavior of the other vehicle can be continuously recognized, and the driving can be performed in consideration of the distribution situation of other surrounding vehicles.

  Furthermore, according to this vehicle information display device, according to the driver's visual acuity value, the higher the visual acuity value, the higher the cutoff spatial frequency is set, and the spatial frequency component equal to or higher than the cutoff spatial frequency is removed. Since a low spatial frequency image is created, a low spatial frequency image with a reduced blur condition can be displayed for a driver with high visual acuity, but it can suppress the induction of the focus adjustment reaction, but it does not induce the eye movement. The fact that the direction and distance of the other vehicle can be reliably transmitted is the same as in the case of a driver with low vision.

  Furthermore, according to this in-vehicle information display device, at the start of display of the display image and at the time of display stop, the time corresponding to the range of ± 0.5 logunit from the optimum time frequency at which the field of view having the luminance contrast sensitivity becomes the widest is obtained. Since the luminance contrast of the display pattern is gradually increased or decreased, it is possible to prevent the movement of the line of sight when starting and stopping the display of the display pattern.

  Furthermore, according to this in-vehicle information display device, in order to change the display pattern so as to enhance the attractiveness of the display pattern, the color of the display pattern is changed, the change from non-flashing to blinking, or high spatial frequency components are not included. Since the display pattern can be changed to a display pattern including a high spatial frequency component, it is possible to reliably and quickly grasp a scene where the distance of another vehicle is within a predetermined range.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

It is a figure for demonstrating the range which has contrast sensitivity with respect to a specific spatial frequency. It is a figure which shows the eccentric angle with respect to a time frequency for every spatial frequency. It is a block diagram which shows the structure of the vehicle-mounted information display apparatus to which this invention is applied. It is a figure which shows the structure of the display part in the vehicle-mounted information display apparatus to which this invention is applied. It is a figure which shows the other structure of the display part in the vehicle-mounted information display apparatus to which this invention is applied. It is a figure explaining the example of a display of a display pattern, (a) is a display pattern when another vehicle exists in the left rear side of the own vehicle, (b) is an other vehicle exists in the right rear side of the own vehicle. (C) is a display pattern when another vehicle approaches the host vehicle. It is a figure explaining displaying the display pattern of (a) and the display pattern of (b) alternately, when another vehicle approaches the own vehicle. It is a figure for demonstrating the change of a display pattern when the distance of the own vehicle and other vehicles becomes small gradually.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back and back side monitoring apparatus 2 Image control part 3 Image generation part 4 Display part 10,11 Display pattern

Claims (7)

An in-vehicle information display device that transmits information by presenting an image to a driver of the own vehicle,
Display means for displaying the display pattern at a display position in a range excluding a center range of a predetermined foreground out of a predetermined foreground range visible to the driver;
Rear other vehicle detection means for detecting the direction and distance of the other vehicle existing behind the host vehicle,
The display position of the display pattern in the horizontal direction is determined based on the direction of the other vehicle with respect to the own vehicle detected by the rear other vehicle detection means, and the other vehicle with respect to the own vehicle detected by the rear other vehicle detection means Image control means for determining the size of the display pattern based on the distance;
Image generating means for causing the display means to display the display pattern of the size determined by the image control means at the display position of the display pattern in the horizontal direction determined by the image control means. In-vehicle information display device.   The image generating means is a spatial frequency at which a contrast sensitivity of an observer can be obtained in a peripheral region of the visual field excluding a center range of the predetermined foreground, and there is no spatial edge. The in-vehicle information display device according to claim 1, wherein a low spatial frequency image composed of frequency components in the range is generated as the display pattern.   The image control means acquires the driver's visual acuity value, and the higher the acquired visual acuity value is, the higher the spatial frequency component at which the brightness contrast sensitivity of the driver is obtained only in the predetermined center range, The in-vehicle information display device according to claim 1 or 2, wherein a low spatial frequency image excluding a spatial frequency component equal to or higher than a spatial frequency is created as the display pattern.   The image control means has a range of ± 0.5 log unit from the optimum time frequency at which the eccentric angle from the central visual field of the driver that obtains the brightness contrast sensitivity is the widest when the display pattern display starts or stops. The in-vehicle information display device according to any one of claims 1 to 3, wherein the luminance contrast of the display pattern is gradually increased or decreased over a time corresponding to the time.   The image control means changes the color of the display pattern so as to enhance the attractiveness of the display pattern when the distance of the other vehicle detected by the rear other vehicle detection means falls within a predetermined range. The in-vehicle information display device according to any one of claims 1 to 4, wherein the on-vehicle information display device is characterized.   The image control unit changes the display pattern from non-flashing to flashing or does not include a high spatial frequency component when the distance of the other vehicle detected by the rear other vehicle detection unit falls within a predetermined range. The in-vehicle information display device according to any one of claims 1 to 4, wherein the display pattern is changed to a display pattern including a high spatial frequency component. A vehicle information display method for transmitting information by presenting an image to a driver of the own vehicle,
Detect the direction and distance of other vehicles behind the host vehicle,
When displaying the display pattern at the display position of the range excluding the center range of the predetermined foreground out of the predetermined foreground range visible to the driver,
The display position of the display pattern in the horizontal direction is determined based on the direction of the other vehicle relative to the detected own vehicle, and the size of the display pattern is determined based on the distance from the detected vehicle to the other vehicle. ,
Generating a low spatial frequency image having a size of the determined display pattern and excluding a spatial frequency component from which a brightness contrast sensitivity of a driver can be obtained only in the predetermined foreground range;
The vehicle information display method, wherein the low spatial frequency image is displayed at the display position of the determined display pattern in the horizontal direction.