WO2012172842A1 - 運転支援装置 - Google Patents
運転支援装置 Download PDFInfo
- Publication number
- WO2012172842A1 WO2012172842A1 PCT/JP2012/056448 JP2012056448W WO2012172842A1 WO 2012172842 A1 WO2012172842 A1 WO 2012172842A1 JP 2012056448 W JP2012056448 W JP 2012056448W WO 2012172842 A1 WO2012172842 A1 WO 2012172842A1
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- WIPO (PCT)
- Prior art keywords
- vehicle
- road
- driving support
- rear side
- luminance
- Prior art date
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/588—Recognition of the road, e.g. of lane markings; Recognition of the vehicle driving pattern in relation to the road
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/20—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/22—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle
- B60R1/23—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view
- B60R1/26—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view to the rear of the vehicle
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/166—Anti-collision systems for active traffic, e.g. moving vehicles, pedestrians, bikes
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/167—Driving aids for lane monitoring, lane changing, e.g. blind spot detection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/10—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
- B60R2300/105—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using multiple cameras
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/30—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing
- B60R2300/304—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing using merged images, e.g. merging camera image with stored images
- B60R2300/305—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing using merged images, e.g. merging camera image with stored images merging camera image with lines or icons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/30—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing
- B60R2300/307—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing virtually distinguishing relevant parts of a scene from the background of the scene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2300/00—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
- B60R2300/80—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement
- B60R2300/8086—Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement for vehicle path indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
Definitions
- the present invention relates to a driving support device that displays an image of the rear side of a host vehicle taken by a camera on a display provided near the driver's seat.
- the position of the guide line to be superimposed on the screen of the display is a fixed position assuming a fixed distance from the host vehicle, but the inventors of the present invention display the guide line in this manner.
- the display of the guide line may be inappropriate for the driver depending on the traveling condition of the vehicle.
- the present invention has been made in view of the above background, and when the guide line is superimposed on the rear side image of the host vehicle and displayed on the display, the display of the guide line becomes inappropriate for the driver. It aims at providing the driving support device which prevented that.
- the present invention has been made to achieve the above object, and a guide line indicating a measure of the distance from the vehicle is superimposed on an image on the rear side of the vehicle taken by a camera mounted on the vehicle.
- the present invention relates to the improvement of a driving assistance apparatus provided with a display control unit for displaying on a display mounted on the vehicle.
- the road shape recognition part which recognizes the shape of the road which the said vehicle is driving is provided, and the shape of the road where the said vehicle is traveling is a predetermined shape by the said road shape recognition part in the said display control part When it is recognized that the guide line is not displayed, or the display position of the guide line is set in accordance with the shape of the road recognized by the road shape recognition unit (first invention).
- the guide line when the vehicle travels on a straight flat road, the guide line is displayed at a fixed position of the display to allow the driver to see other vehicles behind the vehicle. The distance up to can be recognized correctly.
- a road having a predetermined shape such as a curved road or a road whose inclination changes
- the guide line is displayed at a fixed position assuming a straight flat road of the display, The deviation between the position of the image of the road on the display and the display position of the guide line becomes large.
- the display control unit may not display the guide line when the road shape recognition unit recognizes that the shape of the road on which the vehicle is traveling is a predetermined shape, or The display position of the guide line is set in accordance with the shape of the road recognized by the road shape recognition unit. This makes it possible to prevent the display of the guide line from becoming inappropriate for the driver.
- the predetermined shape is a curved road having a curvature equal to or greater than a first predetermined value, or a road shape of a traveling route when turning right or left at an intersection (second invention).
- the display of the guide line when the vehicle is turning with a large curvature, the display of the guide line is not displayed, or the display position of the guide line is set according to the curvature of the road.
- the display of the guide line can be prevented from becoming inappropriate for the driver.
- the predetermined shape is a road shape having a gradient change rate equal to or higher than a second predetermined value (a third invention).
- the display of the guide line is not displayed or the display position of the guide line is adjusted to the slope change rate. It is possible to prevent the display of the guide line from becoming inappropriate for the driver due to the fluctuation of the relationship between the display position of the guide line and the distance from the vehicle by setting the setting.
- a brightness detection unit for detecting the brightness around the vehicle, and another vehicle behind the vehicle based on a captured image of the camera.
- the display control unit is configured to detect the rear side object when the brightness around the vehicle detected by the brightness detection unit is equal to or less than a predetermined level. It is preferable to display the guide line only when the other vehicle is detected by the detection unit, and to hide the guide line when the other vehicle is not detected by the rear side object detection unit. 4 invention).
- the guide line when the guide line is displayed in a situation where the surroundings of the vehicle are dark and the display screen of the display is dark as in nighttime or tunnel traveling, a display screen in which the white line of the road is not visible either Then, only the guide line is emphasized to give the driver a sense of discomfort.
- the display control unit detects another vehicle behind the vehicle by the rear side object detection unit.
- the guide line is displayed only when the vehicle is being driven, and the guide line is not displayed when the rear side object detection unit does not detect another vehicle on the rear side.
- only the guide line is highlighted on the display at night or the like, which can prevent the driver from feeling uncomfortable.
- the image of the rear side of the vehicle captured by the camera when the vehicle is traveling the brightness of the brightness detection area set so as to include the image portion beside the road periodically changes.
- a luminance change detection unit that detects
- the display control unit is configured such that, when the luminance change detection unit detects that the luminance of the luminance detection area periodically changes, a luminance difference between pixels in the luminance detection area with respect to the image It is preferable to perform blurring processing to reduce the image and to display the image subjected to the blurring processing on the display (the fifth invention).
- the rear side of the vehicle imaged by the camera is when power poles or streetlights are lined up along the road or when plants are crowded by the side of the road where the vehicle is traveling.
- the brightness of the image part by the side of the road in the image of (b) periodically changes. In such a case, if the image captured by the camera is displayed on the display as it is, the flickering of the screen becomes large and the display becomes troublesome for the driver.
- the display control unit determines between the pixels in the luminance detection area. After the blurring process to reduce the luminance difference, the image is displayed on the display. As a result, it is possible to reduce the flickering of the image displayed on the display, and to prevent the driver of the vehicle from having a bothersome display.
- the luminance detection area has a shape in which the length in the first direction corresponding to the vertical direction of the vehicle is longer than the length in the second direction corresponding to the lateral direction of the vehicle Is preferable (sixth invention).
- an object extending vertically from a road, such as a telephone pole or a streetlight, lined along the road by making the brightness detection area a shape elongated in the first direction corresponding to the vertical direction of the vehicle It is possible to make it easy to detect a periodic change in luminance due to the image taken by the camera.
- the display control unit may set a pixel whose luminance periodically changes in the luminance detection area to a vanishing point at which an image portion of a road disappears in a direction corresponding to the rear of the vehicle. It is preferable to perform the blurring process when distributed in the direction (the seventh invention).
- the seventh invention it is possible to easily detect a periodic change in luminance due to continuous imaging of plants crowded at the side of a road by the camera.
- a road condition detecting unit for detecting a condition of a road on which the vehicle is traveling is provided, and the display control unit is a road having the plurality of lanes. It is preferable that the blurring process is performed only when the vehicle is traveling at the left end or the right end when traveling on the road (8th invention).
- the brightness change detection unit detects whether the brightness periodically changes for each pixel of the brightness detection area.
- the blurring process is preferably performed only when the proportion of pixels whose luminance is changing periodically occupying the total pixels of the luminance detection area is equal to or greater than a predetermined value (9th invention).
- the blurring of the image by the image control unit is limited to the case where it is assumed that the proportion of pixels in which the periodic luminance change occurs is high and the flickering is increased when displayed on the display.
- the display control unit reduces the contrast of the luminance detection area or the maximum luminance of each pixel in the luminance detection area. It is preferable to carry out a process for reducing the luminance to a predetermined upper limit or less (the tenth invention).
- the tenth invention it is possible to easily reduce the luminance change in the luminance detection area.
- an acceleration / deceleration detection unit for detecting the acceleration / deceleration of the vehicle
- the brightness change detection unit is configured to have the brightness based on the acceleration / deceleration of the vehicle. It is preferable to set a reference cycle when detecting a periodic change (invention 11).
- the moving speed imaging interval of an image portion such as a power pole or a roadside of a road in a time-series captured image of the camera which fluctuates according to a change in traveling speed of the vehicle.
- Explanatory drawing of the use condition of a driving assistance device The block diagram of a driving assistance device.
- Explanatory drawing of the guide line display in a curvilinear road Explanatory drawing of the guide-line display in the road where gradient is constant.
- Explanatory drawing of the guide line display in night time Explanatory drawing of the condition where a telephone pole is located in a line at equal intervals on the left side of the road where self-vehicles are traveling.
- Flow chart of the blurring process Explanatory drawing of the process which detects a luminance change about the captured image of the left rear side camera in the condition shown in FIG.
- Explanatory drawing of blurring process Explanatory drawing of the condition where the cluster of plants continues in the left side of the road where the own vehicle is driving. Explanatory drawing of the process which detects a luminance change about the captured image of the left rear side camera in the condition shown in FIG.
- FIG. 1 An embodiment of a driving support device of the present invention will be described with reference to FIGS. 1 to 13.
- the driving assistance apparatus (see FIG. 2) of the present embodiment is mounted on a vehicle 1 and used, and a left rear side camera 2L mounted on a left door mirror of the vehicle 1 (camera of the present invention And the left rear side image ImL of the vehicle 1 captured by the above is displayed on the left rear side display 3L (corresponding to the display of the present invention) provided on the dashboard.
- the driving support device can display an image ImR of the right rear side of the vehicle 1 captured by the right rear side camera 2R (corresponding to the camera of the present invention) mounted on the right door mirror of the vehicle 1 It displays on the right rear side indicator 3R (equivalent to the indicator of the present invention) provided in.
- the following vehicle 50 travels on the left rear side of the vehicle (own vehicle) 1 and the right rear side of the vehicle 1 It is the image imaged with the left rear side camera 2L and the right rear side camera 2R in the condition where the vehicle 51 which has passed the opposite lane with the vehicle 1 is traveling.
- guide lines 30, 31, 32 as a measure of the distance from the vehicle 1 are displayed superimposed on the captured image of the left rear side camera 2L.
- the driving support device 10 imaging signals of the left rear side camera 2 L and the right rear side camera 2 R, a detection signal of a steering angle by the steering angle sensor 8, a yaw rate sensor 4 Detection signal of the yaw rate of the vehicle 1, detection signal of illuminance around the vehicle 1 by the illuminance sensor 5, detection signal of inclination of the vehicle 1 in the longitudinal direction by the inclination sensor 6, and traveling speed of the vehicle 1 by the speed sensor 9 A detection signal is input.
- the driving support device 10 recognizes the position (location position and position on the map) of the vehicle 1 by communication with the navigation device 7. Further, the driving support device 10 outputs display data to the left rear side indicator 3L and the right rear side indicator 3R.
- the driving support device 10 is an electronic unit configured by a CPU, a memory, and the like, and the CPU executes the control program for driving support held in the memory by the CPU to display the left rear side indicator 3L and the right rear side.
- Lane mark detection which detects a lane mark (white line etc.) provided on the road based on images taken by the display control unit 11 which controls the display of the display 3R, the left rear side camera 2L and the right rear side camera 2R Unit 12, Road shape recognition unit 13 for recognizing the shape of the road on which the vehicle 1 is traveling, Brightness detection unit 14 for detecting the brightness around the vehicle 1 based on the detection signal of the illumination sensor 5, Left rear side A rear side object detection unit 15 that detects an object (such as another vehicle) present on the rear side of the vehicle 1 based on images taken by the one camera 2L and the right rear side camera 2R, a left rear side camera 2L and Right rear side camera 2 Brightness change detection unit 16 that detects a periodic brightness change of the captured image, road condition detection unit 13 that detects
- the driving support device 10 recognizes the shape of the road on which the vehicle 1 is traveling, and controls the display mode of the guide line to the left rear side indicator 3L and the right rear side indicator 3R according to the shape of the road. Do. Hereinafter, this control will be described according to the flowchart shown in FIG.
- the driving support apparatus 10 repeatedly executes the process according to the flowchart shown in FIG. 3 every predetermined control cycle.
- STEP 1 in FIG. 3 is processing by the brightness detection unit 14.
- the brightness detection unit 14 detects the brightness around the vehicle 1 based on the detection signal of the illuminance by the illuminance sensor 5.
- the subsequent STEP 2 is processing by the display control unit 11, and the display control unit 11 determines whether the brightness around the vehicle 1 is equal to or less than a predetermined level (set assuming brightness during nighttime or tunnel traveling) To judge.
- STEP 3 is processing by the road shape recognition unit 13.
- the road shape recognition unit 13 receives the information of the road on which the vehicle 1 is traveling, which is transmitted from the navigation device 7, the steering angle of the steering obtained from the detection signal of the steering angle sensor 8, and the vehicle 1 obtained from the detection signal of the yaw rate sensor 4. Shape of the road on which the vehicle 1 is traveling (curvature, intersection, etc.) from the yaw rate of the road, the slope of the road obtained from the detection signal of the inclination sensor 6, and the shape of the lane mark of the road Recognize the gradient change rate, etc., which corresponds to the predetermined shape of the present invention.
- STEP 20 branched from the next STEP 4 to STEP 6 and STEP 4 is processing by the display control unit 11.
- the display control unit 11 determines whether the curvature of the road on which the vehicle 1 is traveling is equal to or greater than a first predetermined value, or whether the vehicle 1 is turning at an intersection.
- the process branches to STEP20.
- the display control unit 11 hides the guide line or sets the display position of the guide line according to the shape of the road.
- FIG. 4A shows a display state of the left rear side indicator 3L when the vehicle 1 is traveling on a curved road having a large curvature (more than a first predetermined value), and Im1 is A guide line is superimposed and displayed on the position supposing the straight flat road.
- Im1 is A guide line is superimposed and displayed on the position supposing the straight flat road.
- FIG. 4 (b) shows a display screen of the left rear side indicator 3L when the vehicle 1 is traveling on a curved road with a small curvature (less than the first predetermined value), Im4 Is a guide line superimposed on a position assuming a straight flat road. In this case, since the deviation between the guide line and the shape of the straight line is small, it is assumed that the driver who visually recognizes Im4 does not feel discomfort.
- the display position of the guide line is set according to the shape of the road or as shown in Im3.
- the guide line may be superimposed on a normal position assuming a straight flat road as shown by Im5 in FIG. 4B.
- the process proceeds to STEP 5.
- the display control unit 11 determines whether the gradient change rate of the road on which the vehicle 1 is traveling is equal to or greater than a second predetermined value.
- the display control unit 11 hides the guide line or corrects the display position of the guide line so as to correct the distance error due to the gradient based on the detection signal of the inclination sensor 6.
- the non-display of the guide line or the correction of the display position of the guide line is performed for a predetermined time (for example, after the gradient change rate becomes almost zero) from when the gradient change rate becomes the second predetermined value or more. Until the point at which the point at which the gradient change rate behind the vehicle 1 has become greater than or equal to the second predetermined is greater than or equal to the time taken for the left rear side camera 2L and the right rear side camera 2R to go out of view Is done.
- FIG. 5 shows a display screen Im10 of the left rear side indicator 3L when the vehicle 1 is traveling on a road having a substantially constant slope.
- the distance between the guide lines is normal, it is not necessary to hide the guide lines or to correct the display position of the guide lines.
- the driver can correct the display position of the guide line by not displaying the guide line or correcting the display position of the guide line based on the detection signal of the inclination sensor 6 so as to correct the distance error due to the gradient. Can be prevented from giving incorrect distance information.
- the process proceeds to STEP 6 and the display control unit 11 displays the guide line at a fixed position assuming a straight flat road ( Normal display of guide lines). Then, the process proceeds to STEP 7 and the driving support apparatus ends the process of one control cycle.
- the display control unit 11 determines whether or not another vehicle is detected behind the vehicle 1 by the rear side object detection unit 15. And when the other vehicle is detected, it progresses to STEP3, and when the other vehicle is not detected, it progresses to STEP11 and the display control part 11 makes a guide line non-display.
- Im20 in FIG. 7 is a nighttime (a situation where the brightness around the vehicle 1 is equal to or less than a predetermined level) and a guide line is displayed when there is no vehicle on the left rear side of the vehicle 1
- the display screen of left rear side indicator 3L is shown.
- the guide line is emphasized in a situation where the background is dark and the white lines of the road are hardly visible, which may give a sense of discomfort to the driver who has visually recognized Im20.
- a left rear side camera 2L for imaging the left rear side of the vehicle 1, a left rear side indicator 3L for displaying the imaged image, and an image for the right rear side of the vehicle 1 Is shown to include the right rear side camera 2R and the right rear side indicator 3R for displaying the captured image, but at least one of the left rear side and the right rear side of the vehicle 1 is shown.
- the present invention can be applied to the configuration provided with a camera for capturing an image and a display for displaying the image, and the effect can be obtained.
- the road shape recognition unit 13 outputs the information of the road on which the vehicle 1 is traveling, which is transmitted from the navigation device 7, the steering angle of the steering obtained from the detection signal of the steering angle sensor 8, the yaw rate sensor 4
- the vehicle 1 is traveling from the yaw rate of the vehicle 1 obtained from the detection signal of 1, the slope of the road obtained from the detection signal of the inclination sensor 6, and the shape of the lane mark of the road detected by the lane mark detection unit 12.
- the shape of the road (curvature, intersection, slope change rate, etc.) was recognized. However, it is not necessary to necessarily recognize the shape of the road using all of these, and the shape of the road can be recognized by various combinations of these.
- the shape according to the curvature of the road, the intersection, and the gradient change rate is shown. You may set the non-display and display position of the guide line.
- FIG. 8 shows a situation where the utility poles 60, 61, 62 are arranged at equal intervals on the left side of the road on which the vehicle 1 is traveling. Under such circumstances, in the time-series captured image of the left rear side camera 2L, the image portion of the telephone pole sequentially moves (flows) in the horizontal coordinate direction.
- the movement of the image portion of the telephone pole causes flickering on the display screen of the left rear side indicator 3L, causing the driver who visually recognizes the left rear side indicator 3L to feel bothersome.
- the left rear side camera 2L and the right rear side camera 2R are provided on the left and right outermost sides of the vehicle 1 and the distance d with the objects beside the road is short, the annoyance felt by the driver is Become stronger.
- the driving assistance device 10 displays the captured image of the right rear side camera 2R on the right rear side indicator 3R.
- the captured image is subjected to blurring processing. The first and second embodiments of the blurring process will be described below.
- STEP 50 in FIG. 9 is processing by the road condition detection unit 17.
- the road condition detection unit 17 detects the condition of the road on which the vehicle 1 is traveling, based on the data received from the navigation device 7.
- the subsequent STEP 51 is processing by the display control unit 11.
- the display control unit 11 is traveling on the left lane of the road having a plurality of lanes based on the condition of the road detected by the road condition detection unit 17. Determine if it is or not.
- the process proceeds to STEP 52.
- the process branches to STEP 56 to end the process.
- the driving assistance by the execution of the blurring process is performed by performing the blurring process only when the lane 1 is traveling the left lane.
- the computational load of the device 10 can be reduced.
- STEP 52 is processing by the acceleration / deceleration detection unit 18, and the acceleration / deceleration detection unit 18 detects the acceleration / deceleration of the vehicle 1 from the change in the traveling speed of the vehicle 1 recognized by the speed detection signal of the speed sensor 9.
- the subsequent STEs 53 to 54 are processes by the luminance change detection unit 16.
- the luminance change detection unit 16 sets a reference cycle for determining a periodic change in luminance based on the traveling speed and acceleration / deceleration of the vehicle 1.
- the reference cycle is set shorter as the traveling speed of the vehicle 1 increases.
- the luminance change detection unit 16 determines the luminance of the luminance detection areas s1, s2, s3, ... of each captured image of the captured image of the time series of the left rear side camera 2L, the determination cycle set around the reference cycle. It is determined whether or not it is changing in the internal cycle.
- FIG. 10 is a captured image of the left rear side camera 2L under the situation shown in FIG. 8, the image portions 65, 66, 67, ... of the long utility pole in the vertical coordinate direction (y direction) are , Move (flow) in the horizontal coordinate direction (x direction). Therefore, by setting long luminance detection areas s1, s2, s3, ... in the vertical coordinate direction (y direction), the degree of periodic change in luminance of the luminance detection area due to the presence of the utility pole by the road is increased. This makes it easy to detect periodic changes in luminance.
- the subsequent STEP 55 and STEP 60 to STEP 61 are processing by the display control unit 11.
- the display control unit 11 determines whether the luminance of each luminance detection area changes in a cycle within the determination cycle range set around the reference cycle. Then, when there is a luminance detection area in which the luminance changes in a cycle within the determination cycle range, the process branches to STEP 60, and when there is no luminance detection area in which the luminance changes in the determination cycle range, the process proceeds to STEP 56 , End the process.
- the display control unit 11 determines that the ratio of the pixels occupying the total pixels at a cycle within the determination cycle range is a predetermined value for the brightness detection area in which the brightness changes at a cycle within the determination cycle range. It is determined whether or not it is above. Then, when there is a luminance detection area (hereinafter referred to as a blurring target area) in which the ratio of pixels changing in a cycle within the determination cycle range to the total pixels is equal to or more than a predetermined value, the process proceeds to STEP 61. On the other hand, when there is no blurring target area, the process branches to STEP 56 to end the process.
- a luminance detection area hereinafter referred to as a blurring target area
- the display control unit 11 performs blurring processing on the blurring target area.
- the display control unit 11 performs processing such as reducing the contrast of the blurring target area, decreasing the luminance of the pixel whose brightness is equal to or higher than a predetermined level, and the like as the blurring processing. Then, the process proceeds to STEP 56, and the display control unit 11 ends the process.
- FIG. 11A is an explanatory view of the process of lowering the contrast
- the vertical axis is set to the luminance (Lm)
- the horizontal axis is set to the number (Pn) of each pixel of the blurring target area
- Md represents the average value of the luminance of each pixel.
- FIG. 11A shows a luminance distribution 71 in which the degree of deviation from the average value Md is reduced with respect to the luminance distribution 70 on the left side.
- the contrast of the blurring target area can be lowered to reduce the luminance difference between the pixels of the blurring target area.
- the vertical axis is set to luminance (Lm), and the horizontal axis is set to the number (Pn) of each pixel of the blurring target area, and the luminance distribution of the pixels of the blurring target area
- Md represents the average value of luminance
- Hc represents the upper limit value of luminance
- FIG. 11B shows the luminance distribution in which the luminance of the pixel exceeding the upper limit Hc is changed to the upper limit Hc with respect to the luminance distribution 72 on the left.
- the display control unit 11 performs blurring processing on the captured image of the left rear side camera 2L according to the flowchart of FIG. 9, and then displays the image on the left rear side display 3L.
- the telephone pole, the streetlight, etc. are lined up on the left side of the road on which the vehicle 1 is traveling, whereby the time-series captured image of the left rear side camera 2L moves the image part of the telephone pole or the street tree When it becomes (flowing), flickering of the screen of the left rear side indicator 3L due to these image portions can be reduced.
- the blurring process is performed in a state where the utility poles and the streetlights are arranged at predetermined intervals at the left end of the road.
- the plants are crowded with plants on the left side of the road. The case where the blurring process is performed in the situation where the group 80 is used will be described.
- the plant part 80 is the image portion of the plant group 80 in the captured image of the left rear side camera 2L. Because various plants and trees grow irregularly, the brightness changes in a short cycle.
- the display control unit 11 performs blurring processing on the captured image of the left rear side camera 2L in order to reduce flickering of the display screen of the left rear side indicator 3L due to the presence of such a plant group 80.
- the luminance change detection unit 16 is an image of a road behind the vehicle 1 with pixels whose luminance changes in a short cycle. Detects a portion 81 (distributed in the direction of the optical flow 91, 92) distributed toward the vanishing point 90 where the In this case, the entire captured image Im51 is a luminance detection area.
- the luminance change detection unit 16 performs an edge extraction process, a straight line extraction process, and the like on the captured image Im51 of the left rear side camera for the vanishing point 90 and the optical flows 91 and 92, and It is determined by recognizing an image part of a plant group.
- the display control unit 11 performs the above-described blurring process on the distribution 81 or the distribution 81 and the periphery thereof.
- the luminance change detection unit 16 performs such blurring processing on the captured image of the left rear side camera 2L, and displays the captured image subjected to the blurring processing on the left rear side display 3L.
- the left side of the road on which the vehicle 1 is traveling is a plant group
- an image portion of the plant group flows in the captured image of the left rear side camera 2L
- the flickering of the screen of the left rear side display 3L due to the image portion of can be reduced.
- the degree of flickering of the screen of the left rear side indicator 3L differs depending on the ratio of the range of the image part of the plant group occupied in the captured image of the left rear side camera 2L, and also the impression of annoyance felt by the driver It is different.
- Reference numeral 95 denotes a vanishing point in the captured image Im52
- 96 and 97 denote optical flows of the image portion 82 of the plant group.
- the higher the ratio the wider the range in which the blurring process is performed
- the level of blurring may be increased (the contrast may be lowered, and the upper limit value of luminance may be lowered).
- the blurring process is performed only when traveling on the left lane, and In STEP 60, the blurring process is performed only when the ratio of the image whose luminance is changing periodically becomes equal to or more than the predetermined value, but the limitation is performed when the vehicle 1 is traveling in the right end lane In the case of or even without these limitations, the effects of the present invention can be obtained.
- the reference cycle is set based on the acceleration / deceleration of the vehicle in STEP 52 to STEP 53 of FIG. 9, but the reference cycle may be set without using the acceleration / deceleration.
- the driving support device of the present invention when the guide line is superimposed on the rear side image of the host vehicle and displayed on the display, the display of the guide line is inappropriate for the driver. Is useful for assisting the driver because it can be prevented.
- SYMBOLS 1 Vehicle (self-vehicle), 2L ... Left rear side camera, 2R ... Right rear side camera, 3L ... Left rear side indicator, 3R ... Right rear side indicator, 10 ... Driving assistance device, 11 ... Display control unit 12 Lane mark detection unit 13 Road shape recognition unit 14 Brightness detection unit 15 Rear side object detection unit 16 Brightness change detection unit 17 Road condition detection unit 18 Acceleration / deceleration detection unit.
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Abstract
Description
前記表示制御部は、前記輝度変化検知部により前記輝度検知領域の輝度が周期的に変化していることが検知されたときに、前記画像に対して前記輝度検知領域内の画素間の輝度差を減少させるぼかし処理を施し、該ぼかし処理を施した画像を前記表示器に表示することが好ましい(第5発明)。
運転支援装置10は、車両1が走行している道路の形状を認識し、道路の形状に応じて左後側方表示器3L及び右後側方表示器3Rへのガイド線の表示態様を制御する。以下、図3に示したフローチャートに従って、この制御について説明する。運転支援装置10は、所定の制御サイクル毎に、図3に示したフローチャートによる処理を繰り返し実行する。
次に、図8は、車両1が走行している道路の左脇に、電柱60,61,62が等間隔で並んでいる状況を示している。このような状況下では、左後側方カメラ2Lの時系列の撮像画像において、電柱の画像部分が水平座標方向に順次移動する(流れる)。
先ず、図9に示したフローチャートに従って、第1実施形態について説明する。なお、以下では、左後側方カメラ2Lの撮像画像について説明するが、運転支援装置10は、右後側方カメラ2Rの撮像画像についても同様の処理を行う。運転支援装置10は、車両1の走行中に、所定の制御サイクル毎に図9のフローチャートによる処理を実行する。
次に、図12~図13を参照して、ぼかし処理の第2実施形態について説明する。
Claims (11)
- 車両に搭載されたカメラにより撮像された該車両の後側方の画像に、前記車両からの距離の目安を示すガイド線を重畳させた画像を、前記車両に搭載された表示器に表示する表示制御部を備えた運転支援装置において、
前記車両が走行している道路の形状を認識する道路形状認識部を備え、
前記表示制御部は、前記道路形状認識部により、前記車両が走行している道路の形状が所定形状であると認識されているときに、前記ガイド線を非表示とするか、又は前記ガイド線の表示位置を、前記道路形状認識部により認識された道路の形状に合わせて設定する運転支援装置。 - 請求項1記載の運転支援装置において、
前記所定形状は、曲率が第1所定値以上の曲線道路、又は交差点の右折又は左折時の走行経路の道路の形状である運転支援装置。 - 請求項1に記載の運転支援装置において、
前記所定形状は、勾配変化率が第2所定値以上の道路の形状である運転支援装置。 - 請求項1に記載の運転支援装置において、
前記車両の周囲の明るさを検知する明るさ検知部と、
前記カメラの撮像画像に基づいて、前記車両の後側方に存在する他車両を検知する後側方物体検知部とを備え、
前記表示制御部は、前記明るさ検知部により検知されている前記車両の周囲の明るさが所定レベル以下であるときは、前記後側方物体検知部により他車両が検知されているときにのみ前記ガイド線を表示し、前記後側方物体検知部により他車両が検知されていないときには、前記ガイド線を非表示とする運転支援装置。 - 請求項1に記載の運転支援装置において、
前記車両の走行時に前記カメラにより撮像された前記車両の後側方の画像について、道路脇の画像部分が含まれるように設定された輝度検知領域の輝度が、周期的に変化していることを検知する輝度変化検知部を備え、
前記表示制御部は、前記輝度変化検知部により前記輝度検知領域の輝度が周期的に変化していることが検知されたときに、前記画像に対して前記輝度検知領域内の画素間の輝度差を減少させるぼかし処理を施し、該ぼかし処理を施した画像を前記表示器に表示する運転支援装置 - 請求項5に記載の運転支援装置において、
前記輝度検知領域が、前記車両の上下方向に対応した第1方向の長さが、前記車両の左右方向に対応した第2方向の長さよりも長い形状とされている運転支援装置。 - 請求項5に記載の運転支援装置において、
前記表示制御部は、前記輝度検知領域内で輝度が周期的に変化している画素が、道路の画像部分が前記車両の後方に対応した方向で消失する消失点に向かって分布しているときに、前記ぼかし処理を行う運転支援装置。 - 請求項5に記載の運転支援装置において、
前記車両が走行している道路の状況を検知する道路状況検知部を備え、
前記表示制御部は、前記車両が複数の車線を有する道路を走行しているときには、前記車両が左端又は右端の車線を走行しているときに限定して、前記ぼかし処理を行う運転支援装置。 - 請求項5に記載の運転支援装置において、
前記輝度変化検知部は、前記輝度検知領域の各画素について輝度が周期的に変化しているか否かを検知し、
前記表示制御部は、前記輝度検知領域の総画素に占める、輝度が周期的に変化している画素の割合が所定値以上であるときに限定して、前記ぼかし処理を行う運転支援装置。 - 請求項5に記載の運転支援装置において、
前記表示制御部は、前記ぼかし処理として、前記輝度検知領域のコントラストを下げるか、又は前記輝度検知領域内の各画素の最大輝度を所定の上限輝度以下にする処理を行う運転支援装置。 - 請求項1に記載の運転支援装置において、
前記車両の加減速度を検知する加減速度検知部を備え、
前記輝度変化検知部は、前記車両の加減速度に基づいて、前記輝度検知領域の輝度が周期的に変化していることを検知するときの基準周期を設定する運転支援装置。
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EP12801216.8A EP2720460B1 (en) | 2011-06-13 | 2012-03-13 | Driving assistance device |
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US20140092237A1 (en) | 2014-04-03 |
JP5450900B2 (ja) | 2014-03-26 |
EP2720460A1 (en) | 2014-04-16 |
CN103535029B (zh) | 2017-05-24 |
JPWO2012172842A1 (ja) | 2015-02-23 |
EP2720460B1 (en) | 2017-01-04 |
EP2720460A4 (en) | 2015-05-06 |
CN103535029A (zh) | 2014-01-22 |
US9275287B2 (en) | 2016-03-01 |
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