Rear-view mirror for providing rear blind spot warning function and control method thereof

Abstract

The present invention provides a rear-view mirror for providing a rear blind spot warning function and a control method thereof. The rear-view mirror and the control method thereof according to a preferred embodiment of the present invention: detect a vehicle quickly approaching a subject vehicle in motion from a rear image capturing the area behind the vehicle; display the speed of the detected vehicle; and when the detected vehicle is in very close proximity to the vehicle in motion and enters a blind spot, provide a warning to a user by lighting / blinking the area where the detected vehicle is located on a display screen of a display, and provide an alarm through a speaker, thereby more actively informing the user of the situation behind the vehicle in addition to simply showing the area behind the vehicle, so that the user can make broader judgments regarding the rear situation and thus the risk of accidents is reduced during lane changes.

Description

Rear-view mirror providing rear blind spot warning function and method for controlling the same

[0001] The present invention relates to a rear-view mirror and a method for controlling the same, and more specifically, to a rear-view mirror and a method for controlling the same that provides a rear blind spot warning function.

[0002] Generally, vehicles are equipped with a rear-view mirror inside the cabin to allow observation of the rear of the vehicle. Conventional rear-view mirrors are limited in their functionality to simply displaying the rear view of the vehicle through a mirror, and it is difficult to clearly see the rear of the vehicle when dust or snow accumulates on the rear window.

[0003] Another conventional technology to solve these problems has proposed a digital rear-view mirror. The digital rear-view mirror installs a digital camera at the rear of the vehicle to photograph the rear of the vehicle, and by outputting the image captured by the digital camera to a display included in the digital rear-view mirror, it can provide the driver with the situation behind the vehicle regardless of the condition of the vehicle's rear window.

[0004] These conventional technologies simply install an RGB camera that outputs a color image at the rear of the vehicle, and depending on user operation, output the rear color image captured by the RGB camera through a display included in the digital rear-view mirror, or display the image reflected in the mirror to the user like a conventional rear-view mirror.

[0005] However, despite these digital rear-view mirrors being more expensive than standard rear-view mirrors, they do not provide functions beyond showing the rear of the vehicle, resulting in low utilization by users.

[0006] The problem that the present invention aims to solve is to provide a rear-view mirror and a method for controlling the same that not only provides a function of simply showing the rear view of a vehicle, but also performs a warning for a vehicle approaching from the rear of the vehicle and located in a blind spot.

[0007] A rear-view mirror according to a preferred embodiment of the present invention for solving the above-mentioned problem comprises: a rear camera that captures the rear and generates a rear image; a display that outputs the image; a mirror module installed in front of the display and adjusting the transmittance according to a control signal; and a circuit unit including a processor and a memory. The processor, which executes a command stored in the memory, performs the following steps: (a) outputting a rear image to the display when the display mode is a display mode; (b) detecting a vehicle in the rear image and calculating the relative speed of the detected vehicle; (c) displaying the speed of the detected vehicle when the relative speed of the detected vehicle is greater than or equal to a threshold speed; (d) determining whether the detected vehicle in the rear image is approaching a moving vehicle; and (e) outputting an alarm to the user while illuminating and flashing the area of ​​the display where the approaching vehicle is located when the detected vehicle is approaching.

[0008] In addition, the processor can calculate the relative speed of the detected vehicle by counting the number of pixels the detected vehicle has moved within the rear image at regular time intervals in step (b).

[0009] In addition, in step (b), the processor can divide the rear image displayed on the display into an upper area and a lower area, and divide the upper area and the lower area into a left area, a right area, and a middle area, and detect a vehicle in the upper area.

[0010] In addition, the processor may determine in step (c) that the detected vehicle is close to the vehicle in motion if it spans the upper area and the lower area.

[0011] Additionally, in step (c), the processor may display the relative speed for the detected vehicle, or display the absolute speed of the detected vehicle by adding the relative speed to the speed of the vehicle currently in motion.

[0012] In addition, in step (c), if the relative speed of the detected vehicle is greater than or equal to a threshold speed, the processor can expand and change the display range in the rear image and output it to the display.

[0013] Meanwhile, a control method for a rear-view mirror according to a preferred embodiment of the present invention for solving the above-mentioned problem is a control method for a rear-view mirror performed in a rear-view mirror comprising a rear camera that captures the rear and generates a rear image, a display that outputs an image, a mirror module installed in front of the display that adjusts transmittance according to a control signal, and a circuit unit including a processor and a memory, comprising: (a) a step in which, when the display mode is a display mode, the processor outputs a rear image to the display; (b) a step in which the processor detects a vehicle in the rear image and calculates the relative speed of the detected vehicle; (c) a step in which, when the relative speed of the detected vehicle is greater than or equal to a threshold speed, the processor displays the speed for the detected vehicle; (d) a step in which the processor determines whether the detected vehicle in the rear image is approaching a moving vehicle; and (e) a step in which, when the detected vehicle is approaching, the processor outputs an alarm to the user while illuminating and flashing an area of ​​the display where the approaching vehicle is located.

[0014] In addition, in step (b) above, the processor can calculate the relative speed of the detected vehicle by counting the number of pixels the detected vehicle has moved within the rear image at regular time intervals.

[0015] Additionally, in step (b) above, the processor can divide the rear image displayed on the display into an upper area and a lower area, and divide the upper area and the lower area into a left area, a right area, and a middle area, and detect a vehicle in the upper area.

[0016] In addition, a method for controlling a rear-view mirror, characterized in that, in step (c) above, the processor determines that the detected vehicle is close to the vehicle in motion if it spans across the upper area and the lower area.

[0017] Additionally, in step (c) above, the processor may display the relative speed for the detected vehicle, or display the absolute speed of the detected vehicle by adding the relative speed to the speed of the vehicle currently in motion.

[0018] Additionally, in step (c) above, if the relative speed of the detected vehicle is greater than or equal to a threshold speed, the processor can expand and change the display range in the rear image and output it to the display.

[0019] A rear-view mirror and a control method according to a preferred embodiment of the present invention detect a vehicle rapidly approaching the vehicle in motion in a rear-view image of the rear of the vehicle, display the speed of the detected vehicle, and if the detected vehicle approaches the vehicle in motion at a very close distance and moves into a blind spot, provide an alert to the user by illuminating / flashing the area where the vehicle is located on the display screen and providing an alarm through a speaker, thereby not only providing the user with a function to simply show the rear view of the vehicle but also more actively informing the user of the situation behind the vehicle, and accordingly, the user can make a judgment on a wider rear situation, and as a result, the risk of accidents occurring when changing lanes is reduced.

[0020] FIGS. 1a and FIGS. 1b are drawings illustrating the functional configuration and external configuration, respectively, of a rear-view mirror providing a rear blind spot warning function according to a preferred embodiment of the present invention.

[0021] FIG. 2 is a flowchart illustrating a control method for a rear-view mirror that provides a rear blind spot warning function according to a preferred embodiment of the present invention.

[0022] Figure 3 is a diagram illustrating an example of divided regions of a rear image displayed on a display.

[0023] Figure 4 is a drawing illustrating an example of changing the display angle of view (display range).

[0024] FIGS. 5A and FIGS. 5B are drawings illustrating an example of illuminating / flashing an area where a vehicle is located near the display.

[0025] FIG. 6a is a diagram illustrating a process of detecting a vehicle according to another preferred embodiment of the present invention, and FIG. 6b is a diagram illustrating a method of performing an alarm to a user.

[0026] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0027] Hereinafter, the aforementioned objects, features, and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings. However, as the present invention is subject to various modifications and may have various embodiments, specific embodiments are illustrated in the drawings and described in detail below.

[0028] Throughout the specification, identical reference numbers indicate identical components in principle. Additionally, components with identical functions within the scope of the same concept appearing in the drawings of each embodiment are described using the same reference numeral.

[0029] When a part of a specification is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part" or "module" as used in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware or software, or as a combination of hardware and software.

[0030] If it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the essence of the present invention, such detailed description is omitted. Additionally, numbers used in the description of this specification (e.g., 1st, 2nd, etc.) are merely identification symbols to distinguish one component from another.

[0031]

[0032] FIGS. 1a and FIGS. 1b are drawings illustrating the functional configuration and external configuration, respectively, of a rear-view mirror providing a rear blind spot warning function according to a preferred embodiment of the present invention.

[0033] Referring to FIG. 1a and FIG. 1b, a rear-view mirror (100) according to a preferred embodiment of the present invention includes a rear camera (110), a mirror module (140), a display (130), and a circuit unit (120), and the circuit unit (120) includes a processor (121), a memory (123), and a communication module (125).

[0034] The mirror module (140), display (130), and circuit (120) are included in the rear-view mirror housing (190) and installed near the front windshield of the vehicle interior.

[0035] The rear camera (110) is installed on the exterior rear of the vehicle, captures the rear of the vehicle to generate a rear image, and transmits the rear image to the processor (121).

[0036] The rear camera (110) is implemented as a standard RGB camera (color camera) and generates a color image and outputs it to the processor (121). The rear camera (110) may be used to have a shooting angle of 120 degrees or more so that blind spots can be captured, and it is preferable to install it as a camera with a field of view of 180 degrees.

[0037] The display (130) can be implemented as an LCD module, an OLED module, etc., and is turned on / off according to the control of the processor (121), and outputs a video signal generated by the processor (121).

[0038] The mirror module (140) contains an EC (Electronic Chromic) film inside and is positioned in front of the display (130). Under the control of the processor (121), the light transmittance (i.e., reflectance) of the EC film included in the mirror module (140) is adjusted. Accordingly, when the reflectance of the mirror module (140) becomes greater than a predefined threshold and the transmittance becomes less than a predefined threshold, the mirror module (140) performs the role of a reflector. Conversely, when the reflectance of the mirror module (140) becomes less than a predefined threshold and the transmittance exceeds a predefined threshold, the mirror module (140) transmits an image displayed on the display (130) so that the driver and passengers can view the image on the display (130).

[0039] The communication module (125) communicates with the vehicle's main controller (200) to receive information related to vehicle control from the vehicle's main controller (200) and output it to the processor (121). The communication module (125) can receive vehicle speed information from the vehicle's main controller (200) and output it to the processor (121).

[0040] The memory (123) is implemented as an SSD (Solid State Drive), flash memory, ROM (Read-Only Memory), RAM (Random Access Memory), etc., and stores instructions to be executed by the processor (121) and data processed by the processor (121).

[0041] The processor (121) can be implemented as a CPU (Central Processing Unit) or a similar device (e.g., MPU (Micro Processing Unit), MCU (Micro Control Unit), etc.) and controls the display (130) and mirror module (140) by executing instructions stored in memory (123), processes a color image input from the rear camera (110) to generate an image to be output to the display (130), and outputs the generated image through the display (130).

[0042] To specifically describe the function of the processor (121) according to a preferred embodiment of the present invention, the processor (121) operates the rear-view mirror (100) in display mode or mirror mode according to user input.

[0043] The rear-view mirror (100) can select a display mode or a mirror mode by pressing a button (not shown) provided in the housing. The method of the user selecting the mode can be implemented in various ways, and since the method of selecting the mode is a general design specification, a specific description is omitted.

[0044] When the user selects mirror mode, the processor (121) turns off the display (130) so that the back view is reflected by the mirror module (140) and displayed to the user.

[0045] When the user selects a display mode, the processor (121) turns on the rear camera (110) to receive a rear image (color image) and outputs the rear image through the display (130).

[0046] In display mode, the processor (121) detects a rear vehicle approaching at high speed in the rear image, displays the (relative) speed for the detected vehicle, and when the vehicle approaches closely and proceeds into a blind spot, divides the display screen, displays lighting / flashing effects on the area where the approaching vehicle is located to notify the driver of the danger, and outputs an alarm through a speaker, etc. The functions of the processor (121) of the present invention will be explained in detail with further reference to FIG. 2.

[0047]

[0048] FIG. 2 is a flowchart illustrating a control method for a rear-view mirror that provides a rear blind spot warning function according to a preferred embodiment of the present invention.

[0049] Referring further to FIG. 2, a method for controlling a rear-view mirror that provides a rear blind spot warning function is described as follows: First, the processor (121) checks whether the display mode is a mirror mode or a display mode by examining mode setting information stored in memory (123) or mode setting information input through a setting button (not shown), etc. (S210).

[0050] When the display mode is mirror mode, the processor (121) turns off the display (130) so that the rear view is reflected through the mirror module (140) and displayed to the user (S220).

[0051] Meanwhile, when the display mode is the display mode, the processor (121) turns on the display (130) and adjusts the transmittance of the mirror module (140) so that an image output through the display (130) is displayed to the user, and at the same time drives the rear camera (110) (S230).

[0052] Then, a rear image, which is a color image captured through the rear camera (110), is input to the processor (121), and the processor (121) outputs the rear image to the display (130) (S241).

[0053] After that, the processor (121) divides the rear view displayed through the display (130) into multiple regions (regions), detects a vehicle for each region, and calculates the relative speed between the vehicle currently driving and the detected vehicle (S243).

[0054] FIG. 3 is a drawing showing an example of a divided area in a rear image according to a preferred embodiment of the present invention.

[0055] Referring further to FIG. 3, in step S243, the processor (121) divides the rear image displayed on the display (130) into an upper area (area 1, 2, 3) and a lower area (area 4, 5, 6), divides the upper area and the lower area into a left area (area 1, 4), a right area (area 3, 6), and a middle area (area 2, 5), thereby dividing it into six areas, and checks whether a vehicle is detected in the upper area (1, 2, 3), that is, the area (1, 2, 3) that is further away from the vehicle.

[0056] The processor (121) can detect a vehicle in the rear image using various methods, and in a preferred embodiment of the present invention, a vehicle in the rear image is detected using an EOH-SVM algorithm.

[0057] To briefly explain the object detection method using the EOH-SVM algorithm, it is a method that extracts directional information from boundary lines to determine the presence of specific objects within an image and classifies them using a machine learning classifier (SVM). This process largely consists of a feature extraction stage and a stage of determining whether something is an object based on the extracted features. First, the input image is converted to grayscale because boundaries (edges) are more important than color information.

[0058] Edge detectors such as Sobel or Canny are used on the transformed image to calculate the gradient direction of the boundary for each pixel. By dividing the obtained orientation information into multiple segments (e.g., 8 or 9 directions) and counting the number of pixels corresponding to each direction, an Edge Orientation Histogram (EOH) is generated at the level of small image cells. This histogram provides a concise representation of the directional characteristics of the edges present in that cell. If necessary, multiple cells are grouped into a single block, and block-level normalization is performed to obtain stable features that are less sensitive to changes in lighting. Finally, by concatenating the histograms for the entire search window, an EOH feature vector is created that quantifies the geometric structure of the corresponding image patch.

[0059] Next, a Support Vector Machine (SVM) classifier is trained using the feature vectors constructed in this way. During the training phase, multiple image patches containing objects (positive) and background patches without objects (negative) are prepared, and End-of-Hose (EOH) features are extracted from each patch and input into the SVM. The SVM identifies the decision boundary that best distinguishes the two classes, and once training is complete, it can rapidly determine whether a new patch is an object or not using a linear function.

[0060] When detecting a vehicle in step S243 of the present invention, object detection is performed on regions 1, 2, and 3 of FIG. 3. That is, EOH features are calculated in regions 1, 2, and 3 on the left, center, and right of the image, and it is determined whether it is a vehicle through a learned SVM.

[0061] After that, the processor (121) calculates the relative speed of the detected vehicle using the position change of the detected vehicle in the image of the detected vehicle at regular time intervals. For example, in the rear image taken by the vehicle currently in motion (the vehicle currently taking the rear image), if the detected vehicle moves in a direction approaching the vehicle at a rate of 100 pixels per second, and assuming that a displacement of 100 pixels corresponds to an actual distance of 90 cm, the relative speed of the detected vehicle located behind with respect to the vehicle currently in motion is 3.24 km / h (=0.9 m / s). If the vehicle is moving at a speed of 60 km / h, the speed of the vehicle approaching from the rear is calculated to be 63.24 km / h.

[0062] After the relative speed is calculated, the processor (121) checks whether the relative speed of the detected vehicle is greater than or equal to a predefined threshold speed, and if the relative speed is less than the threshold speed, it repeatedly performs the rear image output and the vehicle detection and relative speed calculation processes (S245). In a preferred embodiment of the present invention, the threshold speed is set to 15 km / h, but the threshold speed can be changed according to the embodiment.

[0063] If the relative speed of the detected vehicle is greater than or equal to a predefined threshold speed, the processor (121) provides an indirect warning to the user by displaying the speed of the detected vehicle (S251).

[0064] At this time, the speed displayed for the detected vehicle may be an absolute speed or a relative speed depending on the user's preset. If the user sets the absolute speed, the processor (121) receives the current speed of the vehicle in motion from the vehicle's main controller (200), and adds the relative speed obtained in step S243 to this to obtain and display the absolute speed of the detected vehicle.

[0065] After that, the processor (121) can change the display angle (display range) and output it (S253).

[0066] As described above, a wide-angle camera is primarily used as the rear camera (110), and the size of the image captured by the wide-angle camera is larger than the size of the image normally displayed through the display (130). That is, if the image captured by the wide-angle camera is displayed entirely on the display (130), a lot of information is displayed on the display (130), but the size of the objects is displayed very small, making it difficult for the user to identify the objects. Therefore, the processor (121) crops the image from the rear image to an appropriate size and outputs it through the display (130).

[0067] However, in a preferred embodiment of the present invention, if there is a trailing vehicle approaching the vehicle at a speed greater than a threshold speed, the processor (121) can expand the display range (display angle) so that more content is displayed in the rear image in order to check the movement status of the trailing vehicle.

[0068] Referring to the example illustrated in FIG. 4, the processor (121) normally crops only area A of the entire rear image and outputs it through the display (130), but when the speed of the detected vehicle is above a threshold speed, it can expand the area output to the display (130) from area A to area B.

[0069] Additionally, for the sake of convenience of explanation, steps S251 and S253 are described as being performed sequentially; however, the order of execution may be changed to S251 and S253. Furthermore, depending on the embodiment, step S253 may be omitted.

[0070] Meanwhile, the processor (121) checks whether the detected trailing vehicle approaches the left or right blind spot and whether it approaches the immediate rear collision-possible position (S255), and if it approaches, it alerts the user to the danger by illuminating / flashing the area of ​​the display where the detected vehicle is located (S260). Additionally, in step S260, the processor (121) may further output an alarm through a speaker (not shown), etc.

[0071] In step S255, the processor (121) determines whether the detected rear vehicle is located in any area of ​​the image displayed on the display by using only the image to determine the proximity of the vehicle without adding a separate sensor. That is, it determines whether the trailing vehicle is located only in the upper part (i.e., areas 1, 2, 3) of the rear image output through the display (130), or whether the trailing vehicle is located across the upper part (i.e., areas 1, 2, 3) and the lower part (i.e., areas 4, 5, 6) of the image. If it is located across the upper part and the lower part, it outputs a warning to the user to be careful because the detected vehicle is approaching the blind spot of the main driving vehicle. However, if the trailing vehicle is located only in the upper part of the image, it is determined that a certain distance is being maintained, so only the speed is displayed and no special warning is performed.

[0072] FIGS. 5A and 5B are drawings illustrating an example of illuminating / flashing an area where a vehicle is located in close proximity on a display. Referring further to FIGS. 5A and 5B, in step S260, the processor (121) determines that a vehicle is present across area 2 and area 5, and across area 3 and area 6, and thus a vehicle is present in close proximity to the area, and performs an alert to the user by repeatedly illuminating / flashing the screen for the area.

[0073] Meanwhile, the aforementioned steps S243 and S260 can be used to derive various modified embodiments.

[0074] FIG. 6a is a diagram illustrating a process of detecting a vehicle according to another preferred embodiment of the present invention, and FIG. 6b is a diagram illustrating a method of performing an alarm to a user.

[0075] Referring to FIG. 6a, in step S243, the processor (121) may set a region of interest (610) as shown as a rectangle in the rear image, and by detecting a vehicle within the region of interest (610), the amount of computation for vehicle detection may be significantly reduced.

[0076] Referring to FIG. 6b, in step S260, the processor (121) may display the area around the display (130) in a specific color (e.g., red) (630) if there is an approaching vehicle, and perform a specific mark (e.g., a red circle) (620) on the approaching vehicle to provide an alert to the driver.

[0077]

[0078] The method for controlling a rear-view mirror according to a preferred embodiment of the present invention described so far can be implemented as a computer program that is executed as a computer-executable instruction and stored in a non-transient storage medium.

[0079] Storage media include all types of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable storage media include ROM, RAM, CD-ROM, and optical data storage devices. Additionally, computer-readable storage media are distributed across networked computer systems, allowing computer-readable code to be stored and executed in a distributed manner.

[0080] The present invention has been described above with reference to its preferred embodiments. Those skilled in the art will understand that the present invention may be embodied in modified forms without departing from the essential characteristics of the invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the invention is defined by the claims, not by the foregoing description, and all variations within the scope of the claims should be interpreted as being included in the invention.

Claims

1. A rear camera that captures the rear and generates a rear image; A display that outputs an image; A mirror module installed in front of the above display and adjusting transmittance according to a control signal; and It includes a circuit section including a processor and memory, and The processor that executed the instruction stored in the memory above (a) a step of outputting a rear image to the display when the display mode is a display mode; (b) a step of detecting a vehicle in the rear image and calculating the relative speed of the detected vehicle; (c) a step of displaying the speed of the detected vehicle if the relative speed of the detected vehicle is greater than or equal to the threshold speed; (d) a step of determining whether the detected vehicle in the rear image is approaching a moving vehicle; and (e) A rear-view mirror characterized by performing the step of outputting an alarm to the user while illuminating and flashing the area of ​​the display where the nearby vehicle is located when the detected vehicle approaches.

2. In Paragraph 1, The processor above, in step (b), A rear-view mirror characterized by calculating the relative speed of a detected vehicle by counting the number of pixels moved by the detected vehicle within the rear image at regular time intervals.

3. In Paragraph 1, The processor above, in step (b), A rear-view mirror characterized by dividing the rear image displayed on the above display into an upper area and a lower area, dividing the upper area and the lower area into a left area, a right area, and a middle area, and detecting a vehicle in the upper area.

4. In Paragraph 3, The processor above, in step (c), A rear-view mirror characterized by determining that the detected vehicle is close to the vehicle in motion if it spans the upper and lower regions.

5. In Paragraph 1, The processor above, in step (c), A rear-view mirror characterized by displaying the relative speed for the detected vehicle, or displaying the absolute speed of the detected vehicle by adding the relative speed to the speed of the vehicle currently in motion.

6. In Paragraph 1, The processor above, in step (c), A rear-view mirror characterized by expanding and changing the display range in the rear image and outputting it to the display when the relative speed of the detected vehicle is greater than or equal to a threshold speed.

7. A method for controlling a rear-view mirror performed in a rear-view mirror comprising: a rear camera that captures the rear and generates a rear image; a display that outputs the image; a mirror module installed in front of the display that adjusts transmittance according to a control signal; and a circuit unit including a processor and a memory. (a) When the display mode is a display mode, the processor outputs a rear image to the display; (b) A step in which the processor detects a vehicle in the rear image and calculates the relative speed of the detected vehicle; (c) If the relative speed of the detected vehicle is greater than or equal to a threshold speed, the processor displays the speed for the detected vehicle; (d) a step in which the processor determines whether the detected vehicle in the rear image is approaching a moving vehicle; and (e) a step in which, when the detected vehicle approaches, the processor illuminates and flashes the area of ​​the display where the approaching vehicle is located and outputs an alarm to the user; a method for controlling a rear-view mirror characterized by including 8. In Paragraph 7, In step (b) above, A method for controlling a rear-view mirror, characterized in that the processor calculates the relative speed of a detected vehicle by counting the number of pixels that the detected vehicle has moved within the rear image at regular time intervals.

9. In Paragraph 7, In step (b) above, A method for controlling a rear-view mirror, characterized in that the processor divides the rear image displayed on the display into an upper area and a lower area, divides the upper area and the lower area into a left area, a right area, and a middle area, and detects a vehicle in the upper area.

10. In Paragraph 9, In step (c) above, A method for controlling a rear-view mirror, characterized in that the processor determines that the detected vehicle is close to the vehicle in motion if it spans across the upper area and the lower area.

11. In Paragraph 7, In step (c) above, A method for controlling a rear-view mirror, characterized in that the processor displays the relative speed for the detected vehicle, or displays the absolute speed of the detected vehicle by adding the relative speed to the speed of the vehicle currently in motion.

12. In Paragraph 7, In step (c) above, A method for controlling a rear-view mirror, characterized in that the processor expands and changes the display range in the rear image and outputs it to the display when the relative speed of the detected vehicle is greater than or equal to a threshold speed.

13. A non-transient recording medium that records the method for controlling a rear-view mirror according to claim 7 as computer-readable and computer-executable program code.

Images