With the rapid development of the automotive industry, the development of automotive human-computer interaction control technology has diversified, and has experienced “physical button control system†to “touch control systemâ€, “voice control system†(mature), “gesture control system†(gradual maturity) ), "Visual Control" (in research), "EEG Control" (in research), six different control methods, in which the gesture control machine technology is gradually mature, reflecting the driver's attention to experience and driving safety.
What is gesture control?
Gesture control refers to the movement of the hand over the camera to make the phone sense the movement of the hand, so that the alarm is muted and the ringing of the incoming call is muted (the call will not be hung up). The same function has appeared on the Ericsson R520m that year.
For example, when a call or an alarm sounds, the white LED below the camera flashes, which proves that “gesture control†has been turned on. At this time, the hand can be moved back and forth from the camera in the direction of the body, and the ringtone or alarm can be turned off. The height of the hand must be between 0-7 cm (mentioned in the manual), otherwise the sound cannot be turned off. It is. However, it is not easy to implement "gesture control". In other words, the W380i sensor is not very sensitive. Users need to practice a lot to improve the success rate of this function.
The principle of gesture control technology analyzes the change of gesture according to the time difference between the emission and reception of light through the infrared LED light emitting device and the receiving device built in the camera. The final data is transmitted to the control unit of the vehicle system, which is called up and recognized by the control unit. The corresponding function of the gesture.
3. Technical Classification At present, the gesture control is divided into three parts, namely TOF technology, structured light technology and millimeter wave radar technology.
1) ToF technology, represented by the Volkswagen Golf R Touch: a technique for measuring distance by calculating the propagation time of light. According to the difference of the distance, the specific position of the different fingers is determined, thereby determining a specific gesture and corresponding to the corresponding control command.
2) Structured light technology: The basic principle is similar to the ToF technology, except that it uses light with a pattern of points, lines or faces. Take Intel's integrated front-facing camera as an example, which includes infrared laser emitters, infrared sensors, color sensors, and real-world image processing chips.
3) Millimeter wave radar technology, represented by Google: The principle is basically the same as that of ToF technology, but the medium used for measurement changes from light to radio waves. Radio waves (radar waves) are transmitted using the built-in millimeter wave generator, and then the receiver is used to receive echoes. The built-in processing chip calculates the target position data in real time based on the time difference between sending and receiving.
4. Technical Features (1) Composition: The gesture control system consists of a 3D camera and a large module of the control unit. The 3D camera module mainly includes three parts: a camera, an infrared LED, and a camera sensor.
The function of the 3D camera module: using the TOF principle, analyzing the change of the gesture according to the time difference between the emission and acceptance of the light, and transmitting the obtained information to the control unit of the vehicle system; the operating angle, 42 degrees, the maximum effective distance of the hand camera 20 cm, the distance between the left and right is 15 cm. The function of the control unit: to call up the function corresponding to the recognized gesture according to the preset program and the received information.
(2) achievable function: The gesture control system can currently implement preset 7 gesture functions:
1) The palm opens and swings to the right to indicate that the phone is hanging up and canceled;
2) Moving forward and backward with a single finger means answering the call, selecting, and determining;
3) V-shaped gestures indicate pause, play, and custom actions;
4) Turning clockwise with a single finger means increasing the volume and reducing the navigation map;
5) Single counterclockwise rotation means to reduce the volume and enlarge the navigation map;
6) The five fingers are folded into a circle and moved to the right to indicate the next song and return to the main menu;
7) The five fingers are folded into a circle and moved to the left to indicate the previous song and return to the main menu.
(3) Technical advantages
During the driving process, the driver can operate the function without shifting the line of sight, which can greatly improve the driving safety.
5. Application prospects of gesture control technology BMW's new seven-system has adopted the first generation of gesture control technology, as an important guarantee for future car driving safety, the arrival of the era of intelligence and experience is inevitable. At present, many leading car companies or suppliers such as Google, Microsoft, Visteon, and Ford are also researching and applying gesture control technology.
Although it is not known whether the future gesture control will be applied to car steering, acceleration, braking and reversing, the design of the concept car is more concerned about the interior of the cockpit. I believe that this futuristic and safe car technology will be More widely used in the future
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