1. Automatic Speed Control Using Distance Measurement By Single Camera
Signal Processing
2009/8/6
Graduate School of Engineering and Science University of the Ryukyus
098571G Faramarz Asharif

2. Outline Purpose of this research Principle of signal processing
Single camera and distance measurement
Application of stereo imaging
Future Works

3. Purpose of This Research
In recent days car technologies developing and companies over producing cars.
As a result the probability of cars crash increase.
There are many causes that car accident happen.
Collision against front car
Distance of two cars
In our research we are going to develop a system which avoid collision against front car.

4. Purpose of This Research
Structure of collision against front car

5. Principle of Signal Processing
Fig. 1: Block diagram of signal Processing between Input signal &output signal
Input
signal
Output
signal
Comparison
Compensator
Transfer
Function
Sensor

6. Principle of Signal Processing
Input signal Input velocity & reference distance
Output signal Output velocity & real distance
Transfer function Car’s mechanical system model
Sensor camera’s image processing
Input velocity Human Input
Output velocity Mechanical system Output
Real distance Sensor’s output signal
Compensator To control input velocity corresponding to Sensor’s output signal

7. Type of Camera Distance Measurement
For distance measurement in image processing there are two way to measure the distance.
Two camera distance measurement
Statistical system
Single camera distance measurement
Dynamical system

8. Single Camera Distance Measurement
Figure 5:single camera distance measurement

9. Single Camera Distance Measurement
L+dL L
Far distance Closer distance

10. Application of Single Camera
Car
V r Vo
Accelerator K P
Computer e +
Zreference -
Zreal
Sensor
Fig. 2: Block diagram of speed control

11. Application of Stereo Camera
“K” Coefficient is adjusted by following conditions: If

12. Future Application For full Automation in car system
Not only front side of car but also other side of car is required with camera to measure the distance between obstacle.
Figure 5: Future Car’s Camera Sensor

13. Conclusion
Purpose of our research was to avoid collision against front car using distance measurement by image processing.

14. Future Works
As Future works we are going to realize this system and evaluate the result of experiment.

15. Thank you for your attention