CN107512222B - vehicle rearview auxiliary system and control method thereof - Google Patents
vehicle rearview auxiliary system and control method thereof Download PDFInfo
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- CN107512222B CN107512222B CN201710648225.1A CN201710648225A CN107512222B CN 107512222 B CN107512222 B CN 107512222B CN 201710648225 A CN201710648225 A CN 201710648225A CN 107512222 B CN107512222 B CN 107512222B
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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
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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
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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
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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
- B60R2300/8066—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 monitoring rearward traffic
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
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- Closed-Circuit Television Systems (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a vehicle rearview auxiliary system and a control method thereof. The system comprises a rear-view unit, a camera unit and a processing unit, wherein the processing unit is electrically connected with the rear-view unit and the camera unit respectively; the processing unit is used for receiving the peripheral image acquired by the camera shooting unit, playing the peripheral image on the rear-view unit, judging whether the peripheral image is clear or not, controlling the rear-view unit to be switched to a reflection mode if the peripheral image is fuzzy, and controlling the rear-view unit to be switched to a display mode if the peripheral image is clear. The system and the control method thereof automatically switch the reflection mode and the display mode of the rearview mirror according to the definition of a shot picture, and are safe and reliable.
Description
Technical Field
The present invention relates to a display and camera system, and more particularly, to a vehicle rear view assistance system and a control method thereof.
Background
along with the rise of electronic rearview mirrors, more and more automobile rearview mirrors can use the electronic rearview mirrors, the existing electronic rearview mirrors mainly have two modes, one mode is a display mode, the mirror surface of the existing electronic rearview mirror is wide and has no obstruction to the rearview image, the other mode is a common reflection mode, however, the two modes are manually switched by a driver at the present stage, the safety performance of the existing electronic rearview mirror is low, the existing electronic rearview mirror is not intelligent enough, and dangerous accidents are easy to happen.
Such as in the following cases: the method comprises the following steps of (1) when the backing distance is too close, the camera shoots the fuzzy image to cause the display image of the electronic rearview mirror to be fuzzy, (2) in cold winter, the surface of the camera frosts, the camera shoots the fuzzy image to cause the display image of the electronic rearview mirror, and (3) when the surface of a vehicle body and the camera are dirty and dust to cause the display image of the electronic rearview mirror to be fuzzy, 4, when the environment weather is very dark at night, the camera shoots the fuzzy image to cause the display image of the electronic rearview mirror), the camera shoots the fuzzy image to cause the display image of the electronic rearview mirror, and if a driver does not switch to a common reflection mode in time, dangerous accidents are easy to happen.
disclosure of Invention
In order to solve the above-mentioned drawbacks of the prior art, the present invention provides a vehicle rear view assistance system and a control method thereof. The system and the control method thereof automatically switch the reflection mode and the display mode of the rearview mirror according to the definition of a shot picture, and are safe and reliable.
The technical problem to be solved by the invention is realized by the following technical scheme:
A vehicle rearview auxiliary system comprises a rearview unit, a camera shooting unit and a processing unit, wherein the processing unit is electrically connected with the rearview unit and the camera shooting unit respectively; wherein:
The rear-view unit is provided with a reflection mode and a display mode, the reflection mode provides a peripheral picture in a form of reflecting light rays, and the display mode provides a peripheral picture in a form of playing images;
The camera shooting unit is used for acquiring a peripheral image;
the processing unit is used for receiving the peripheral image acquired by the camera shooting unit and playing the peripheral image on the rear-view unit; and the rear-view unit is used for judging whether the peripheral image is clear or not, controlling the rear-view unit to be switched to a reflection mode if the peripheral image is fuzzy, and controlling the rear-view unit to be switched to a display mode if the peripheral image is clear.
Further, the processing unit comprises a judging module and a switching module connected with the judging module, the judging module is used for judging whether the peripheral image acquired by the camera shooting unit is clear, and the switching module is used for controlling the rear-view unit to switch between a reflection mode and a display mode according to the judging result of the judging module.
Furthermore, the judgment module comprises a gray level conversion sub-module, a gray level analysis sub-module and a gray level change rate comparison sub-module which are connected in sequence; wherein:
The gray level conversion module is used for carrying out gray level processing on the peripheral image to obtain the gray level value of each pixel of the peripheral image;
The gray level analysis submodule is used for carrying out quantitative analysis on the gray level value of each pixel to obtain a real-time value of the gray level change rate of the peripheral image;
the gray change rate comparison submodule is preset with a gray change rate threshold and is used for comparing a real-time value of the gray change rate with the gray change rate threshold, if the real-time value is greater than the threshold, the peripheral image is judged to be in a clear state, and if the real-time value is less than the threshold, the peripheral image is judged to be in a fuzzy state.
further, the rear-view unit comprises at least one rear-view component, and the rear-view component comprises a display device and a half-transmitting and half-reflecting mirror element arranged in front of the display device; the processing unit is electrically connected to the display device and controls the on/off and/or brightness of the display device according to the judgment result of the peripheral image.
Further, the rear-view unit comprises at least one rear-view component, and the rear-view component comprises a display device and an electrochromic mirror element arranged in front of the display device; the processing unit is electrically connected to the electrochromic mirror element and controls the reflectivity of the electrochromic mirror element according to the judgment result of the peripheral image.
Further, the processing unit also simultaneously controls an anti-glare function of the electrochromic mirror element in the reflective mode.
Further, the vehicle rearview auxiliary system also comprises an ambient brightness acquisition unit electrically connected with the processing unit and used for acquiring a brightness real-time value of ambient light; the processing unit further comprises a sensitivity adjusting module for controlling the sensitivity of the camera unit according to the real-time value of the brightness of the ambient light.
a control method of the vehicle rearview auxiliary system comprises the following steps:
step 1: the camera shooting unit acquires a peripheral image;
step 2: the processing unit judges whether the peripheral image is clear or not;
And step 3: if the peripheral image is fuzzy, the processing unit controls the rear-view unit to be switched to a reflection mode; and if the peripheral image is clear, the processing unit controls the rear-view unit to be switched to a display mode.
Further, in the reflection mode of step 3, the processing unit also simultaneously controls the anti-glare function of the electrochromic mirror element.
Further, step 1 further comprises: acquiring a brightness real-time value of ambient light by using an ambient brightness acquisition unit; in the display mode of step 3, the processing unit adjusts the sensitivity of the imaging unit according to the real-time value of the brightness of the ambient light.
the invention has the following beneficial effects: the vehicle rearview auxiliary system and the control method thereof automatically switch the reflection mode and the display mode of the rearview mirror according to the definition of a shot picture, avoid manual switching of a driver, prevent safety accidents caused by distraction of the driver due to untimely switching or switching actions, and are safe and reliable.
Drawings
FIG. 1 is a functional block diagram of a vehicle rear-view assistance system provided by the present invention;
FIG. 2 is a functional block diagram of a processing unit of the vehicle rear view assistance system shown in FIG. 1;
FIG. 3 is a schematic view of a rearview assembly for use with the present invention;
FIG. 4 is a block diagram illustrating steps of a method for controlling a rear-view assistance system of a vehicle according to the present invention;
fig. 5 is a block diagram of a substep of step 2 of the control method of the vehicle rear view assistance system shown in fig. 4.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
example one
As shown in fig. 1, a vehicle rear view auxiliary system includes a rear view unit, a camera unit, and a processing unit, wherein the processing unit is electrically connected to the rear view unit and the camera unit, respectively; wherein:
The rear-view unit is provided with a reflection mode and a display mode, the reflection mode provides a peripheral picture in a form of reflecting light rays, and the display mode provides a peripheral picture in a form of playing images;
The camera shooting unit is used for acquiring a peripheral image;
The processing unit is used for receiving the peripheral image acquired by the camera shooting unit and playing the peripheral image on the rear-view unit; and the rear-view unit is used for judging whether the peripheral image is clear or not, controlling the rear-view unit to be switched to a reflection mode if the peripheral image is fuzzy, and controlling the rear-view unit to be switched to a display mode if the peripheral image is clear.
In a specific implementation, the vehicle generally comprises a left rear-view mirror and a right rear-view mirror outside the cockpit and a middle rear-view mirror inside the cockpit, and the rear-view unit can be one or more of the left rear-view mirror, the right rear-view mirror and the middle rear-view mirror; the camera shooting unit comprises at least one camera and is arranged on at least one peripheral position of the vehicle, including but not limited to one or more places such as tail lamps, central high-level brake lamps, rear windows, rear parts of the vehicle body and the like; the peripheral images include, but are not limited to, images directly behind the vehicle and on the left and right sides of the rear window. The at least one camera is preferably a camera of a CMOS photosensitive element.
As shown in fig. 2, the processing unit includes a judging module and a switching module connected to the judging module, the judging module is configured to judge whether the peripheral image acquired by the image capturing unit is clear, and the switching module is configured to control the rear-view unit to switch between the reflective mode and the display mode according to a judgment result of the judging module.
the judging module judges whether the peripheral image is clear or not through fuzzy measurement analysis of the peripheral image.
The judgment module comprises a gray level conversion sub-module, a gray level analysis sub-module and a gray level change rate comparison sub-module which are sequentially connected; wherein:
the gray level conversion module is used for carrying out gray level processing on the peripheral image to obtain the gray level value of each pixel of the peripheral image;
The gray level analysis submodule is used for carrying out quantitative analysis on the gray level value of each pixel to obtain a real-time value of the gray level change rate of the peripheral image;
The gray change rate comparison submodule is preset with a gray change rate threshold and is used for comparing a real-time value of the gray change rate with the gray change rate threshold, if the real-time value is greater than the threshold, the peripheral image is judged to be in a clear state, and if the real-time value is less than the threshold, the peripheral image is judged to be in a fuzzy state.
In a specific implementation, the gray scale analysis submodule may perform quantitative analysis on the gray scale value of each pixel of the peripheral image by using an adjacent pixel gray scale variance method, so as to obtain a gray scale change rate of the peripheral image, and algorithms and steps of the adjacent pixel gray scale variance method are all the prior art, and are not described in detail herein, but other gray scale analysis methods may be adopted; in addition, the threshold of the gray scale change rate may be set to different values according to the imaging quality of the camera unit, the algorithm precision of the processing module, the sensitivity of the driver to the image, and the like, and is not limited herein.
The rear view unit comprises at least one rear view assembly, as shown in fig. 3, comprising a display device 1 and a mirror element 2 arranged in front of the display device 1. In the specific implementation, one rearview mirror is generally provided with one rearview assembly, but two or more rearview assemblies or two or more display devices 1 can be provided behind one mirror element 2 according to requirements, and the display area of the display device 1 can have any shape or size and corresponds to a partial area or a whole area of the mirror element 2.
As a rear view module in the present embodiment, a display device 1 and a half mirror element 2 provided in front of the display device 1; the processing unit is electrically connected to the display device 1 and controls the on/off and/or the brightness of the display device 1 according to the judgment result of the peripheral image.
In the reflective mode, the processing unit turns off the display device 1; in the display mode, the processing unit turns on the display device 1.
based on the characteristics of the half-mirror element 2, theoretically, the rear-view component is in a reflective mode as long as the brightness of the display device 1 is lower than the brightness of the ambient light, and is in a display mode as long as the brightness of the display device is higher than the brightness of the ambient light, so that the rear-view component also provides another control method, namely in the reflective mode, the processing unit reduces the brightness of the display device 1; in the display mode, the processing unit increases the brightness of the display device 1.
At this time, a preset value of the brightness of the ambient light may be set in the vehicle rear-view auxiliary system, or the vehicle rear-view auxiliary system may include an ambient brightness obtaining unit electrically connected to the processing unit, for obtaining a real-time value of the brightness of the ambient light; the processing unit adjusts the brightness of the display device 1 to be lower or higher than a preset brightness value or a real-time brightness value of ambient light.
as another rear view assembly in the present embodiment, a display device 1 and an electrochromic mirror element 2 disposed in front of the display device 1; the processing unit is electrically connected to the electrochromic mirror element 2 and controls the reflectivity of the electrochromic mirror element 2 according to the determination result of the peripheral image.
In the reflective mode, the processing unit increases the reflectivity of the electrochromic mirror element 2; in the display mode, the processing unit reduces the reflectivity of the electrochromic mirror element 2; the processing unit is also electrically connected to the display device 1 for controlling the switching and/or the brightness of the display device 1.
Based on the characteristic that the electrochromic mirror element 2 has only two states of full transmission and reflection, in the reflection mode, the electrochromic mirror element 2 is in the reflection state, and the display device 1 can be switched to any state of bright and dark without limitation; in the display mode, the electrochromic mirror element 2 is in the fully transmissive state and the display device 1 is in the display state.
More optimally, in this rear view assembly, the processing unit also simultaneously controls the anti-glare function of the electrochromic mirror element 2 in the reflective mode.
the reflectivity and the anti-glare function of the electrochromic mirror element 2 are both realized by controlling the color thereof, when the electrochromic mirror element is in a reflecting state, the color is darkened to improve the reflectivity, and the anti-glare function is also realized after the color is darkened.
For example, the voltage of the electrochromic mirror element 2 has two voltages, namely 0V and 2V, and when the peripheral image is clear, the processing unit does not supply current to the electrochromic mirror element 2, that is, the voltage of the electrochromic mirror element 2 is 0V, and the electrochromic mirror element is in a colorless and transparent full-transparent state; when the peripheral image is blurred, the processing unit applies a voltage of 2V to the electrochromic mirror element 2, so that the electrochromic mirror element 2 becomes dark in color and is in a reflection state, and the anti-glare function is achieved.
When the vehicle rearview auxiliary system further comprises an ambient brightness acquisition unit, the processing unit is also used for adjusting the sensitivity of the camera unit according to the real-time value of the brightness of ambient light; the processing unit comprises a sensitivity adjusting module connected with the camera shooting unit and used for controlling the sensitivity of the camera shooting unit according to the real-time value of the brightness of the ambient light.
Example two
as shown in fig. 4, a control method of a vehicle rear view assistance system according to a first embodiment includes the steps of:
Step 1: the camera shooting unit acquires a peripheral image;
step 2: the processing unit judges whether the peripheral image is clear or not;
And step 3: if the peripheral image is fuzzy, the processing unit controls the rear-view unit to be switched to a reflection mode; and if the peripheral image is clear, the processing unit controls the rear-view unit to be switched to a display mode.
after receiving the peripheral image acquired by the camera unit, the processing unit may display the peripheral image on the rear-view unit, determine whether the peripheral image is clear, or directly determine whether the peripheral image is clear, and display the peripheral image on the rear-view unit only in the display mode of the rear-view unit.
As shown in fig. 5, in step 2, the process of determining whether the peripheral image is clear by the processing unit includes the following steps:
step 2.1: carrying out graying processing on the peripheral image to obtain the gray value of each pixel of the peripheral image;
step 2.2: carrying out quantitative analysis on the gray value of each pixel to obtain a real-time value of the gray change rate of the peripheral image;
step 2.3: comparing the real-time value of the gray-scale change rate with a threshold value of the gray-scale change rate;
Step 2.4: if the real-time value is larger than the threshold value, the peripheral image is judged to be in a clear state, and if the real-time value is smaller than the threshold value, the peripheral image is judged to be in a fuzzy state.
If the rear-view unit adopts a rear-view component of a half-mirror element 2, in step 3, in a reflective mode, the processing unit turns off the display device 1; in the display mode, the processing unit turns on the display device 1.
based on the characteristics of the half mirror element 2, theoretically, the rear view module is in the reflective mode as long as the brightness of the display device 1 is lower than the brightness of the ambient light, and the rear view module is in the display mode as long as the brightness of the display device is higher than the brightness of the ambient light, therefore, in the step 3, the following steps may be further performed: in the reflective mode, the processing unit turns down the brightness of the display device 1; in the display mode, the processing unit increases the brightness of the display device 1.
at this time, step 0 may be included before step 1: setting a preset brightness value of ambient light in the processing unit, or further including in step 1: acquiring a brightness real-time value of ambient light; and in step 3, the processing unit adjusts the brightness of the display device 1 to be lower or higher than the preset brightness value or the real-time brightness value of the ambient light.
if the rear-view unit is a rear-view component using an electrochromic mirror element 2, in step 3, in a reflective mode, the processing unit increases the reflectivity of the electrochromic mirror element 2; in the display mode, the processing unit reduces the reflectivity of the electrochromic mirror element 2.
Based on the characteristic that the electrochromic mirror element 2 has only two states of full transmission and reflection, in the reflection mode, the electrochromic mirror element 2 is in the reflection state, and the display device 1 can be switched to any state of bright and dark without limitation; in the display mode, the electrochromic mirror element 2 is in the fully transmissive state and the display device 1 is in the display state.
more optimally, in the reflection mode of step 3, the processing unit also simultaneously controls the anti-glare function of the electrochromic mirror elements 2.
The control method of the vehicle rearview auxiliary system further comprises the steps of obtaining a brightness real-time value of ambient light in step 1, and in the display mode in step 3, the processing unit further adjusts the sensitivity of the camera unit according to the brightness real-time value of the ambient light; if the brightness real-time value of the ambient light is larger, the processing unit reduces the sensitivity of the shooting unit, and if the brightness real-time value of the ambient light is smaller, the processing unit increases the sensitivity of the shooting unit.
the above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (8)
1. A vehicle rear-view assistance system characterized in that: the device comprises a rear-view unit, a camera unit and a processing unit, wherein the processing unit is electrically connected with the rear-view unit and the camera unit respectively; wherein:
The rear-view unit is provided with a reflection mode and a display mode, the reflection mode provides a peripheral picture in a form of reflecting light rays, and the display mode provides a peripheral picture in a form of playing images;
the camera shooting unit is used for acquiring a peripheral image;
The processing unit is used for receiving the peripheral image acquired by the camera shooting unit and playing the peripheral image on the rear-view unit; the rear-view unit is used for judging whether the peripheral image is clear or not, if the peripheral image is fuzzy, the rear-view unit is controlled to be switched to a reflection mode, and if the peripheral image is clear, the rear-view unit is controlled to be switched to a display mode;
The rear-view unit comprises at least one rear-view component, the rear-view component comprises a display device and a mirror element arranged in front of the display device, and the display device is in a display state in a reflection mode and a display mode;
if the mirror element is a semi-transparent semi-reflective mirror element, the processing unit is electrically connected to the display device and controls the brightness of the display device according to the judgment result of the peripheral image, wherein in the reflective mode, the brightness of the display device is lower than the brightness of the ambient light, and in the display mode, the brightness of the display device is higher than the brightness of the ambient light;
if the mirror element is an electrochromic mirror element, the processing unit is electrically connected to the electrochromic mirror element and controls the reflectivity of the electrochromic mirror element according to the judgment result of the peripheral image, wherein in the reflection mode, the electrochromic mirror element is in a reflection state, and in the display mode, the electrochromic mirror element is in a full-transmission state.
2. the vehicle rearview assist system of claim 1, wherein: the processing unit comprises a judging module and a switching module connected with the judging module, the judging module is used for judging whether the peripheral image acquired by the camera shooting unit is clear, and the switching module is used for controlling the rear-view unit to switch between a reflection mode and a display mode according to the judging result of the judging module.
3. The vehicle rearview assist system of claim 2, wherein: the judgment module comprises a gray level conversion sub-module, a gray level analysis sub-module and a gray level change rate comparison sub-module which are sequentially connected; wherein:
The gray level conversion module is used for carrying out gray level processing on the peripheral image to obtain the gray level value of each pixel of the peripheral image;
the gray level analysis submodule is used for carrying out quantitative analysis on the gray level value of each pixel to obtain a real-time value of the gray level change rate of the peripheral image;
The gray change rate comparison submodule is preset with a gray change rate threshold and is used for comparing a real-time value of the gray change rate with the gray change rate threshold, if the real-time value is greater than the threshold, the peripheral image is judged to be in a clear state, and if the real-time value is less than the threshold, the peripheral image is judged to be in a fuzzy state.
4. The vehicle rearview assist system of claim 1, wherein: the processing unit also simultaneously controls an anti-glare function of the electrochromic mirror element in the reflective mode.
5. the vehicle rearview assist system of claim 1, wherein: the vehicle rearview auxiliary system also comprises an ambient brightness acquisition unit electrically connected with the processing unit and used for acquiring a brightness real-time value of ambient light; the processing unit further comprises a sensitivity adjusting module for controlling the sensitivity of the camera unit according to the real-time value of the brightness of the ambient light.
6. a control method of a vehicular rearview assist system as claimed in any one of claims 1 to 5, characterized in that: the method comprises the following steps:
Step 1: the camera shooting unit acquires a peripheral image;
step 2: the processing unit judges whether the peripheral image is clear or not;
And step 3: if the peripheral image is fuzzy, the processing unit controls the rear-view unit to be switched to a reflection mode; and if the peripheral image is clear, the processing unit controls the rear-view unit to be switched to a display mode.
7. The control method of a vehicle rear view assist system according to claim 6, characterized in that: in the reflection mode of step 3, the processing unit also simultaneously controls the anti-glare function of the electrochromic mirror element.
8. The control method of a vehicle rear view assist system according to claim 6, characterized in that: the method also comprises the following steps in the step 1: acquiring a brightness real-time value of ambient light by using an ambient brightness acquisition unit; in the display mode of step 3, the processing unit adjusts the sensitivity of the imaging unit according to the real-time value of the brightness of the ambient light.
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| CN113043954B (en) * | 2021-03-25 | 2022-09-16 | 浙江零跑科技股份有限公司 | Convertible rearview system and method |
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| JP2008103839A (en) * | 2006-10-17 | 2008-05-01 | Nissan Motor Co Ltd | Apparatus and method for monitoring vehicle |
| JP5031617B2 (en) * | 2008-02-25 | 2012-09-19 | パイオニア株式会社 | Related area specifying apparatus and method, and image recognition apparatus and method |
| CN104842871A (en) * | 2014-02-13 | 2015-08-19 | 徐志川 | Automotive electronic rearview system and technical scheme |
| CN106163873B (en) * | 2014-04-01 | 2019-04-26 | 金泰克斯公司 | Automatic display mirror assembly |
| JP6617688B2 (en) * | 2016-11-29 | 2019-12-11 | トヨタ自動車株式会社 | Mirror system for vehicles |
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