TWI613115B - Vehicle warning system - Google Patents

Abstract

The present invention relates to a vehicle rear warning system, which at least includes a light emitting unit, an image capturing unit, an image processing unit, and a warning unit; thereby, the vehicle rear warning system of the present invention is mainly borrowed The hardware design of the light-emitting unit and the image capturing unit installed at the rear of the bicycle, and the method of detecting the optical pattern emitted by the light-emitting unit by the image capturing unit to change the shape due to the objects irradiating the rear of the bicycle, effectively reminding the bicycle Riders are warned about the situation of coming in the rear, and warn the rider of the bicycle in advance to respond to or avoid the arrival of danger, and indeed achieve the accurate detection of the approach of the rear vehicle or pedestrian, and maintain the safety of the life and property of the bike rider Other advantages.

Description

Warning system behind the vehicle

The invention relates to a rear warning system for vehicles, in particular to a warning system which is arranged at the rear of a bicycle and uses the method of image detection to change the optical pattern to warn the rider of the bicycle to pay attention to the situation of the rear vehicle.

According to the press, cycling is one of the most popular leisure activities in today's society. In addition to strengthening the body, riding a bicycle can also achieve the advantages of browsing the scenery, cultivating the heart, and promoting the emotions between parents and children. Therefore, the current society Both men, women and children will choose to engage in outdoor bicycle riding activities in their free time. Furthermore, as the counties and municipal governments promote the popularization of public bicycles, they have also contributed to the trend of domestic bicycle sports. In general, the national average daily usage exceeds 70,000 times and the turnover rate reaches 12 times. Because of the sting, many people use public bicycles for commuting or sports every day.

Although the benefits of riding bicycles are many, according to the data provided by the government, the average casualty caused by bicycle accidents is about 500 people, the age group is mostly 50-59 years old, and the elderly over 65 years old, and because of riding The number of people injured by locomotives or bicycles is also increasing year by year, and the death rate from accidents caused by riding bicycles is twice that of riding locomotives: Therefore, the biggest problem facing bicycles is still safety considerations, such as Most bicycles cannot be equipped with rear-view mirrors like locomotives to observe the status of coming vehicles behind. For example, when riding in a straight line or when turning, the rider of the bicycle must confirm the coming vehicle by turning his head. Condition, but the human The rotation range is limited, and there is still a great risk of coming to the vehicle condition after being recognized by the human eye; therefore, there have been many studies to propose improvements to the above problems, such as the "rear detection device" of the Republic of China Patent No. M534713 Is an example, this new patent is applicable to a bicycle, and includes a detection module, a micro-control module, a switch module, and a warning module; the detection module is installed in the bicycle, And includes a left rear detector and a right rear detector; the microcontroller module includes a microcontroller electrically connected to the left rear detector and the right rear detector; the switch module includes A left turn control switch electrically connected to the microcontroller, and a right turn control switch electrically connected to the microcontroller, the left turn control switch is used to control the operation of the left rear detector, and the right turn control switch Used to control the actuation of the right rear detector; the warning module includes a driving warning device electrically connected to the microcontroller for external warning; this patent is mainly provided on the left and right sides of the rear end of the bicycle. Microwave sensors to sense the status of the left, right, and rear of the bicycle when the bicycle is turning to remind the rider of the bicycle; however, when the bicycle goes straight, these sensors are useless. If there are vehicles such as large trucks Approaching from the rear of the bicycle often leads to serious threats to the life and property of the bicycle rider due to the poor sight of the driver of the big truck; therefore, how to effectively remind the bicycle rider about the rear through innovative hardware design The status of the vehicle is to warn the rider of the bicycle in advance to respond to or avoid the arrival of danger earlier. It is still a problem that the vehicle warning system and other related industry developers and related researchers need to continue to work hard to overcome and solve.

Today, the inventor is in view of the many dangers and shortcomings of the above-mentioned traditional bicycle riders because they cannot effectively know the status of the car after the bike. Supported by experience and improved, and researched accordingly Create the invention.

The main purpose of the present invention is to provide a warning system behind the vehicle, especially a warning system installed at the rear of the bicycle and using the image to detect the change of the optical pattern to warn the rider of the bicycle to pay attention to the situation of the rear vehicle. The hardware design of the light-emitting unit and the image capturing unit installed at the rear of the bicycle, and the method of detecting the optical pattern emitted by the light-emitting unit by the image capturing unit to change the shape due to the objects irradiated on the rear of the bicycle, effectively reminding the bicycle of the Riders are warned about the situation of coming in the rear, and warn the rider of the bicycle in advance to respond to or avoid the arrival of danger, and indeed achieve the accurate detection of the approach of the rear vehicle or pedestrian, and maintain the safety of the life and property of the bike rider Other advantages.

In order to achieve the above-mentioned implementation objective, the inventor proposes a vehicle rear warning system, which at least includes a light emitting unit, an image capturing unit, an image processing unit, and a warning unit; the light emitting unit is provided in a vehicle At the rear end, the light-emitting unit emits a light beam including at least one optical pattern, wherein the optical pattern is changed by being irradiated on at least one object behind the vehicle; the image capturing unit is disposed on the vehicle corresponding to the light-emitting unit At the rear end, the image capturing unit includes an optical lens and a photosensitive element connected to the optical lens. The optical lens captures images of the object and the optical pattern on the photosensitive element; the image processing unit is electrically Connected to the image capture unit, the image processing unit receives the image captured by the image capture unit, the image processing unit includes a detection module, and a recognition module, the detection module detects the optical pattern in the image In the aspect, when the optical pattern changes due to contact with the object and the degree of change is greater than a critical value, the detection module calculates the distance of the object and transmits a first signal, and the recognition module compares the object in the image with the built-in The multiple comparison objects are compared to selectively transmit or not transmit a second signal; the warning unit is electrically connected The image processing unit and the warning unit send out a warning signal when receiving the first signal and the second signal to warn the driver of the vehicle to pay attention to the rear situation.

The vehicle rear warning system as described above, wherein the vehicle is one of a bicycle, a locomotive, an electric vehicle, or an electric bicycle and the like.

As mentioned above, the vehicle rear warning system, wherein the light-emitting unit is one of laser, light-emitting diode, or light-emitting body for outputting a light beam.

As mentioned above, the warning system behind the vehicle, wherein the optical pattern is one of straight lines, grids, or regularly arranged points.

As described above, the warning system behind the vehicle, wherein the light emitting unit may be further provided with a diffraction optical element (Diffraction Optical Element, DOE).

The vehicle behind warning system as described above, in which a diffractive optical element (DOE) splits the light beam into two optical patterns.

The vehicle rear warning system as described above, wherein the object is one or a combination of the two such as vehicles or pedestrians.

As mentioned above, the warning system behind the vehicle, in which the optical lens is a device such as a fisheye lens, a wide-angle lens, or a standard lens.

As mentioned above, the vehicle rear warning system, wherein the photosensitive element is one of photocoupler (Charge Coupled Device, CCD) or complementary metal oxide semiconductor (Complementary Metal-Oxide-Semiconductor, CMOS) and other devices.

The vehicle rear warning system as described above, wherein the image processing unit may be further built with a storage module electrically connected to the identification module, the storage module stores the type of object to provide the ratio when the identification module identifies the object Right to use.

As mentioned above, the vehicle rear warning system, in which the identification module uses one of optical flow detection technology or object contour detection technology to identify objects.

The warning system behind the vehicle as described above, wherein the warning unit is one of a device such as an alarm, a display, or a mobile communication device.

As mentioned above, the rear warning system of the vehicle, wherein the warning signal is presented in the warning unit in one type or a combination of two or more such as sound, light, image, vibration or electric signal.

As mentioned above, the rear warning system of the vehicle, wherein the light-emitting unit may be a flashing light source, and the flashing frequency is the same as the frequency of the frame captured by the image capturing unit.

In the vehicle rear warning system as described above, the detection module can further compare the difference between the previous and the later images captured by the image capturing unit to determine the change of the optical pattern.

In this way, the vehicle rear warning system of the present invention is mainly designed by the hardware design of the light emitting unit and the image capturing unit installed at the rear of the bicycle, and the optical pattern emitted by the light capturing unit is detected by the image capturing unit due to irradiation The method of changing the shape of the objects behind the bicycle effectively reminds the rider of the bicycle about the situation of coming behind the bicycle, and warns the rider of the bicycle in advance to respond to or avoid the arrival of danger in advance, and indeed achieve accurate detection of the rear vehicle or pedestrian, etc. The appearance of objects is close, and the advantages of maintaining the life and property safety of bicycle riders; in addition, the rear warning system of the vehicle of the present invention provides bicycle riders can directly detect the objects in the rear when going straight Approaching, it can effectively solve the traditional rear warning system that only works when the bicycle turns, and does achieve accurate detection of the size of the object and the proximity distance, and early warning of the danger of the advantage; finally, the vehicle of the present invention is behind The warning system is set by the image capture unit of the camera, which can be used as a driving recorder-like function, not only can detect The situation of coming from behind can also transmit images to the rider's mobile communication device to achieve the advantage of saving evidence after the danger occurs.

(1) ‧‧‧Lighting unit

(11) ‧‧‧beam

(111) ‧‧‧Optical pattern

(112) ‧‧‧First optical pattern

(113) ‧‧‧Second optical pattern

(12) ‧‧‧diffractive optical element

(2) ‧‧‧ Transportation

(3) ‧‧‧ Object

(4) ‧‧‧Image capture unit

(41) ‧‧‧Optical lens

(42) ‧‧‧Sensor

(5) ‧‧‧Image processing unit

(51) ‧‧‧Detection module

(52) ‧‧‧Identification module

(53) ‧‧‧Storage module

(6) ‧‧‧Comparison

(7) ‧‧‧Warning unit

(D) ‧‧‧Distance

(S ₁ ) ‧‧‧ First signal

(S ₂ ) ‧‧‧Second signal

Figure 1: A block diagram of the system composition of a preferred embodiment of the vehicle rear warning system of the present invention

Figure 2: Top view of the system architecture of a preferred embodiment of the vehicle rear warning system of the present invention

In order to facilitate your examination committee to understand the technical features, content, advantages and achievable effects of the present invention, the present invention is described in detail in conjunction with the drawings and in the form of expressions of the embodiments, and the drawings used therein, Its purpose is only for illustration and supplementary description, and may not be the true scale and precise configuration after the implementation of the present invention, so it should not be interpreted and limited to the relationship between the scale and the configuration of the attached drawings, and the scope of the present invention in the actual implementation is limited , He Xianming.

First, please refer to FIG. 1 and FIG. 2, which is a block diagram of the system composition of a preferred embodiment of the vehicle rearward warning system of the present invention, and a top view of the system architecture, in which the vehicle rearward warning system of the present invention It includes at least: a light emitting unit (1), which is arranged at the rear end of a vehicle (2), the light emitting unit (1) emits a light beam (11) including at least one optical pattern (111), wherein the optical The pattern (111) is changed by being irradiated on at least one object (3) behind the vehicle (2); in addition, the vehicle (2) is a bicycle, locomotive, electric vehicle, or electric bicycle, etc. A kind of vehicle; furthermore, the light-emitting unit (1) is one of laser, light-emitting diode or light-emitting body used to output a light beam, etc .; in addition, the optical pattern (111) is a straight line, grid or One of the patterns such as regularly arranged points; furthermore, the light emitting unit (1) may be further provided with a diffractive optical element (12), wherein the diffractive optical element (12) splits the light beam (11) into two optical patterns (111); In addition, the object (3) is one or a combination of the two such as vehicles or pedestrians; in a preferred embodiment of the present invention, a light emitting unit (1) presented in a laser mode configuration It is arranged at the rear end of the bicycle vehicle (2), and the outer tether is provided with a diffractive optical element (12) to split the laser beam (11) emitted by the light emitting unit (1) into two straight lines The optical patterns (111) presented in the aspect are the first optical pattern (112) and the second optical pattern (113), respectively, and the first optical pattern (112) and the second optical pattern (113) are separated by a distance (D ), To illuminate the object (3) of the passenger car located behind the bicycle, and the shape of the optical pattern (111) changes due to the irradiation on the passenger car; however, it must be noted that the pattern of the optical pattern (111) above The shape and the number of optical patterns (111) split by the diffractive optical element (12) are for convenience of description, and are not limited to the invention, and those skilled in the art should know different optical patterns (111) As long as the shape and quantity of the image can be recognized by the image vision alone, it will not affect the actual implementation of the present invention; moreover, the types of the above vehicles (2) and objects (3) are for convenience of description, not To the limit of the present invention, and those skilled in the art should know that different types of vehicles (2) only need to detect the state of the rear object (3) or different types of objects (3) as long as they can cause optical patterns (111) ) The shape change does not affect the actual implementation of the present invention; an image capture unit (4) corresponds to the light emitting unit (1) and is provided at the rear end of the vehicle (2), and the image capture unit (4) It includes an optical lens (41) and a photosensitive element (42) connected to the optical lens (41), wherein the optical lens (41) captures the image of the object (3) and the optical pattern (111) on the photosensitive Component (42) Imaging; in addition, the optical lens (41) is one of fisheye lens, wide-angle lens or standard lens, etc. Furthermore, the photosensitive element (42) is a photoelectric coupling element (CCD) or complementary metal oxide semiconductor (CMOS) In one of the preferred embodiments of the present invention, it is presented in the form of a fisheye lens and built into the image capturing unit (4) corresponding to the light emitting unit (1) at the rear end of the bicycle The optical lens (41) captures the image of the passenger car located behind the bicycle and the optical pattern (111) on the photosensitive element (42) in the form of a photoelectric coupling element (CCD); an image processing unit (5) ), Which is electrically connected to the image capture unit (4), the image processing unit (5) receives the image captured by the image capture unit (4), and the image processing unit (5) includes a detection module (51) ), And an identification module (52), the detection module (51) detects the state of the optical pattern (111) in the image, when the optical pattern (111) changes due to contact with the object (3) and changes When the degree is greater than a critical value, the detection module (51) calculates the distance of the object (3) and transmits a first signal (S ₁ ), and the recognition module (52) sets the object (3) in the image Compare with the built-in multiple comparison objects (6) to selectively transmit or not transmit a second signal (S ₂ ); In addition, the image processing unit (5) can be further built with an electrical connection identification The storage module (53) of the module (52), the storage module (53) stores the comparison object (6) to provide the comparison use of the identification module (52) when identifying the object (3); The identification module (52) uses one of the optical flow detection technology or object contour detection technology to identify the object (3); in a preferred embodiment of the present invention, the image processing unit (5) is The image capturing unit (4) is electrically connected to receive the image of the passenger car and the optical pattern (111) captured by the image capturing unit (4). The image processing unit (5) uses the following two methods To detect the state of the passenger car located behind the vehicle (2) of the bicycle, that is: 1. Detect with the detection module (51): detect the irradiation on the passenger car with the detection module (51) The degree of shape change of the first optical pattern (112) or the second optical pattern (113) to determine the type of the object (3), that is, when the passenger car contacts the first optical pattern (112), the first optical pattern (112) When the change width of the shape change is greater than the threshold of 1 meter, the detection module (51) calculates the distance between the passenger car and the bicycle and transmits the first signal (S1) to the warning unit (7), then the warning The unit (7) issues a warning signal, and when the passenger car gets closer to the bicycle and contacts the second optical pattern (113), the detection module (51) transmits the first signal (S1) to the warning unit (7) again To prompt the warning unit (7) to issue a more rapid warning signal to warn the rider to pay attention to the above optical pattern (111 ) The width of the change is the width of the passenger car, so the change width of the optical pattern (111) is greater than 1 meter, which means that the object (3) is a vehicle above the passenger car, and the rider of the bicycle may be in danger. The rear warning system of the vehicle of the present invention can promptly remind the rider of the bicycle in advance of the range that the rear passenger car may collide in advance and have time to dodge; 2. Compare with the recognition module (52): by recognition The module (52) compares the image of the object (3) of the passenger car to determine the appearance of the object (3), that is, after the recognition module (52) receives the image of the passenger car transmitted by the image capturing unit (4), The identification module (52) uses the object contour detection technology to compare the image of the passenger car with the comparison object (6) built in the storage module (53), for example, the object (3) is a passenger car or a large truck At the same time, when it matches with the comparison of the small passenger car or large truck in the comparison object (6), the identification module (52) transmits the second signal (S2) to the warning unit (7); however, if the object ( 3) When it is only a pedestrian, and it matches the pedestrian standard in the comparison object (6), the recognition module (52) does not transmit any signal to the warning unit (7), which is due to the pedestrian's object (3 ) Is not enough to cause immediate danger to the rider of the bicycle, so whether the rear warning system of the vehicle of the present invention transmits the second signal (S2) to the warning unit (7) can be determined by the user in the manner of encountering danger ; And a warning unit (7), which is electrically connected to the image processing unit (5), when the warning unit (7) receives the first signal and the second signal, it sends out a warning signal to warn the driving of the vehicle (2) Pay attention to the rear situation; in addition, the warning unit (7) is one of the devices such as siren, display or mobile communication device; furthermore, the warning signal is one of sound, light, image, vibration or electric signal, etc. A type or a combination of two or more is presented in the warning unit (7); in a preferred embodiment of the present invention, the warning unit (7) can be electrically connected to the image processing unit (5) in one of wired or wireless ways For example, the warning unit (7) may be, for example but not limited to, a display or an alarm mounted on a bicycle. The warning unit (7) is connected to the image processing unit (5) in a wired manner to receive the first signal or the second Signal, and send out a warning signal in the form of an image or sound to warn the bicycle rider about the situation of coming behind, or the warning unit (7) can also be a mobile communication device carried by the bicycle rider ( For example: smart phone, etc.), and the mobile communication device is wirelessly connected to the image processing unit (5) to receive the first signal or the second signal, and send out an image or sound warning signal to warn the bicycle The rider is concerned about the situation of the car coming from behind.

In addition, the light-emitting unit (1) can further be a scintillation light source, and the flashing frequency of the light-emitting unit (1) is the same as the frequency of image capture by the image capture unit (4), and the image processing unit (5) compares images The capturing unit (4) captures the difference between the before and after images to clearly determine the change of the optical pattern (111); in another preferred embodiment of the present invention, the light emitting unit (1) is a kind of light on and off The flickering light source has the same flickering frequency as the image capture unit (4) captures the image, that is, when the light emitting unit (1) emits the light beam (11) with the optical pattern (111), Then the optical lens (41) of the image capturing unit (4) transmits the captured image to the image processing unit (5), and when the light emitting unit (1) at the next time goes out, the image capturing unit (4) The optical lens (41) captures the image again and sends it to the image processing unit (5). The image processing unit (5) subtracts the two captured images before and after the time for comparison. The difference is only the existence of the optical pattern (111), so after subtracting the two images, the image of the optical pattern (111) can be left alone. The image processing unit (5) can more easily determine the shape change of the optical pattern (111) to clearly detect the presence of the object (3) behind the bicycle.

Next, in order to enable your review committee to further understand the purpose, features and desired effects of the present invention, the following specific practical examples of the warning system behind the vehicle of the present invention are given below to further prove that the vehicle behind the vehicle of the present invention The range of practical application of the warning system is not intended to limit the scope of the present invention in any form; when a user rides a bicycle vehicle (2) on the road, the invention can be installed at the rear end of the bicycle The rear warning system of the vehicle uses the image capture unit (4) to detect the optical pattern (111) emitted by the light-emitting unit (1) and the shape changes due to the object (3) irradiated on the rear of the bicycle, etc., Effectively remind the rider of the bicycle about the situation of coming in the rear, and warn the rider of the bicycle in advance to cope with or avoid the arrival of danger in advance; first, prepare a lighting unit (1), in which the lighting unit (1) is installed on the bicycle At the rear end of the vehicle (2), the light emitting unit (1) cover is provided with a diffractive optical element (12) to emit a light beam (11) including two optical patterns (111), wherein the optical pattern (111) is due to It is irradiated on objects such as passenger cars (3) behind the vehicle (2) to produce changes; then, an image capturing unit (4) is prepared, in which the image capturing unit (4) is provided corresponding to the light emitting unit (1) At the rear end of the bicycle, the image capturing unit (4) includes an optical lens (41), and a photosensitive element (42) connected to the optical lens (41), wherein the optical lens (41) captures a passenger car, etc. The image of the object (3) and the optical pattern (111) on it is imaged on the photosensitive element (42); then, an image processing unit (5) is prepared, in which the image processing unit (5) is electrically connected to the image capturing unit ( 4), the image processing unit (5) receives the image captured by the image capturing unit (4), the image processing unit (5) includes a detection module (51), and a recognition module (52), The detection module (51) detects the state of the optical pattern (111) in the image. When the optical pattern (111) changes due to contact with the object (3) and the degree of change is greater than a critical value, the detection module (51) calculates the distance of the object (3) and transmits a first signal (S ₁ ), the recognition module (52) group compares the object (3) in the image with a plurality of built-in comparison objects (6 ) Compare to selectively transmit a second signal (S ₂ ); finally, prepare a warning unit (7), where the warning unit (7) is electrically connected to the image processing unit (5), the warning unit (7) When receiving the first signal (S ₁ ) and the second signal (S ₂ ), a warning signal is issued to warn the driver of the vehicle (2) to pay attention to the rear situation; thereby, after the vehicle of the present invention The Fang's warning system can indeed achieve the accurate detection of the approach of vehicles or pedestrians (3) in the rear, and the advantages of maintaining the safety of life and property of bicycle riders.

As can be seen from the above implementation description, compared with the prior art, the vehicle rear warning system of the present invention has the following advantages:

1. The vehicle rear warning system of the present invention is mainly designed by the hardware design of the light emitting unit and the image capturing unit installed at the rear of the bicycle, and the optical pattern emitted by the light capturing unit is detected by the image capturing unit due to the irradiation of the bicycle The method of changing the shape of the objects in the rear effectively reminds the rider of the bicycle about the situation of coming behind, and warns the rider of the bicycle in advance to respond to or avoid the arrival of danger in advance, and indeed achieve accurate detection of objects such as vehicles or pedestrians behind Being close, and maintaining the advantages of life and property safety of bicycle riders.

2. The rear warning system of the vehicle of the present invention provides that the rider of the bicycle can directly detect the approach of the rear object when moving straight, which can effectively solve the traditional rear warning system only works when the bicycle turns Accurately detect the size of objects and the proximity distance, and early remind the advantage of danger.

3. The rear warning system of the vehicle of the present invention is set by the image capturing unit of the camera, and can be used as a function of a driving recorder, which can not only detect the situation of the rear vehicle, but also transmit the image to the rider. In the mobile communication device, the certificate is saved after the danger occurs According to the advantages.

In summary, the vehicle rear warning system of the present invention can indeed achieve the expected use effect through the embodiments disclosed above, and the present invention has not been disclosed before the application, and it has fully complied with the patent law. Regulations and requirements. I filed an application for a patent for invention in accordance with the law, pleaded for the review, and granted the patent.

However, the illustrations and descriptions disclosed above are only preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention; those who are familiar with the art, according to the characteristic scope of the present invention, do other things Equivalent changes or modifications should be regarded as not departing from the design scope of the present invention.

(1) ‧‧‧Lighting unit

(11) ‧‧‧beam

(111) ‧‧‧Optical pattern

(112) ‧‧‧First optical pattern

(113) ‧‧‧Second optical pattern

(12) ‧‧‧diffractive optical element

(2) ‧‧‧ Transportation

(3) ‧‧‧ Object

(4) ‧‧‧Image capture unit

(5) ‧‧‧Image processing unit

(7) ‧‧‧Warning unit

Claims (15)

A vehicle rear warning system at least includes: a light-emitting unit disposed at the rear end of a vehicle, the light-emitting unit emits a light beam including at least one optical pattern, wherein the optical pattern is irradiated to the Changes are made on at least one object behind the vehicle; an image capture unit corresponding to the light-emitting unit is provided at the rear end of the vehicle. The image capture unit includes an optical lens and an optical lens The connected photosensitive element, wherein the optical lens captures the image of the object and the optical pattern on the photosensitive element; an image processing unit is electrically connected to the image capturing unit, and the image processing unit receives the image An image captured by an image capturing unit. The image processing unit includes a detection module and a recognition module. The detection module detects the state of the optical pattern in the image. When the optical pattern When a change occurs due to contact with the object and the degree of the change is greater than a critical value, the detection module calculates the distance of the object and transmits a first signal, and the recognition module combines the object and the built-in image A plurality of comparison objects are compared to selectively transmit or not transmit a second signal; and a warning unit is electrically connected to the image processing unit, and the warning unit receives the first signal and the second signal At this time, a warning signal is issued to warn the driver of the vehicle to pay attention to the situation behind. The vehicle rear warning system as described in item 1 of the patent application scope, wherein the vehicle is one of a bicycle, a locomotive, an electric vehicle, or an electric bicycle. The vehicle rear warning system as described in item 1 of the patent application scope, wherein the light emitting unit is one of a laser, a light emitting diode or a light emitting body for outputting a light beam. The warning system behind the vehicle as described in item 1 of the scope of the patent application, wherein the optical pattern is one of a straight line, a grid, or regularly arranged points. The rear warning system for vehicles as described in item 3 of the patent application scope, wherein the light emitting unit is further provided with a diffractive optical element (DOE). The vehicle behind warning system as described in item 5 of the patent application scope, wherein the diffractive optical element (DOE) splits the light beam into two optical patterns. The vehicle rear warning system as described in item 1 of the scope of the patent application, wherein the object is one or a combination of both the vehicle and the pedestrian. The vehicle rear warning system as described in item 1 of the patent application scope, wherein the optical lens is one of a fisheye lens, a wide-angle lens, or a standard lens. The vehicle rear warning system as described in item 1 of the patent application scope, wherein the photosensitive element is one of a photoelectric coupling element (CCD) or a complementary metal oxide semiconductor (CMOS). The vehicle rear warning system as described in item 1 of the patent application scope, wherein the image processing unit is further built with a storage module electrically connected to the identification module, and the storage module stores the comparison objects To provide a comparison and use when the recognition module recognizes the object. The vehicle rear warning system as described in item 10 of the patent application scope, wherein the recognition module recognizes the object by one of optical flow detection technology or object contour detection technology. The vehicle rear warning system as described in item 1 of the patent application scope, wherein the warning unit is one of an alarm, a display or a mobile communication device. The vehicle rear warning system as described in item 1 or 12 of the patent application scope, wherein the warning signal is one of a combination of sound, light, image, vibration or electric signal or a combination of two or more in the warning unit Render. As in the vehicle rear warning system described in item 1 of the patent scope, wherein the light emitting unit is further a flashing light source, the flashing frequency is the same as the frequency of the frame captured by the image capturing unit. The vehicle rear warning system as described in item 14 of the patent application scope, wherein the detection module further compares the difference between the front and back images captured by the image capturing unit to determine the change of the optical pattern.