Requirements and Specifications
The changes in the final objective since the last status report have produced major changes in the requirements and specifications. These include environmental conditions, mechanical conditions, testing and reliability.
Electrical
Computer:
The project is based on using two cameras connected to a computer through a USB 2 port. The software that will be developed will run on an x86 PC equipped with Windows XP Operating System.
Digital Cameras: The final product will use two digital cameras that have been provided by Micron. The two cameras will interconnect in a Master-Slave hierarchy. The Master camera will connect to the computer through a USB 2 port.
Power: Electric power for the computer will be provided from an electric wall outlet. The power required to operate the digital cameras will be provided through a USB 2 connection.
| Specification | Value |
| Computer | Pentium III 450 MHz or Higher, 128MB RAM, Adaptec USB 2.0 Adapter and Controller with Windows XP OS. |
| Digital Cameras | Two MI 360 digital cameras with a 752x480 pixel resolution and a frame rate of 60fps, manufactured by Micron. |
| Power | The computer will require 400 Watts from a 120V and 60Hz AC supply. |
Mechanical
Size: The stereo imaging sensor containing two digital cameras should be small enough to be carried around in a person’s luggage while traveling.
Weight: The stereo imaging sensor should be light enough to be carried around in luggage while traveling.
Packaging: The stereo imaging sensor needs to be placed in a package that will hold the two digital cameras in precise alignment, with an adjustable or predetermined (fixed) inter-ocular (between camera) distance. The package should also be able to isolate the camera’s PCBs from the environment and electrostatic discharge.
| Specification | Value |
| Stereo Imaging Sensor Size | Must not be greater than the following: Height = 12” Width = 36” Depth = 12” |
| Interconnection | One USB 2 compatible cable from the master camera to computer |
| Weight | Must not be heavier 15lb. |
Environment
Temperature: The stereo imaging sensor will be used in indoor demonstrations and must be able to operate in such an atmosphere. T he cameras need to be operated within a temperature range specified by the data sheet in order to work correctly.
Humidity: The stereo imaging sensor must be sealed and protected from moisture since exposure to humidity, smoke, etc., could deteriorate or damage the system.
Vibration: The stereo imaging sensor will be attached to a mechanism that simulates vibrations in a car environment. The system should be able to function in such vibration conditions.
Lighting: The stereo imaging sensor should be able to take good quality pictures in different lighting environments, since indoor lighting conditions may vary. Some software correction might be required to improve the quality of the images.
| Specification | Value |
| Operating Temperature | -20°C to +60°C |
Documentation
Installation Manual: An installation manual will be made available once the design has been completed and tested. This manual will include how to setup the stereo imaging sensor for demonstration and how to make the required connections.
Source Code: The source code for all the computer applications designed for this project will be written in a programming language that has the ability to work with real time applications, such as C++. It will also be required to format the source code in a way that is easy to read and understand to anyone new to the project that has some software background.
Testing: Final Demonstration
The final application should be able to detect all approaching objects within a specific range and calculate distance and speed of the approaching objects. If an object is approaching the stereo imaging sensor or if it’s to close the system will activate an alarm.
General
Reliability: The system should be able to detect all the objects approaching the stereo imaging sensor with high accuracy. It will also be required that the system does not produce more than a certain amount of false alarms in the absence of objects approaching the vehicle.
Safety: The system should be design in such way that it is not harmful under normal operation.
| Specification | Value |
| Reliability | Detection of objects approaching vehicle with a reliability of 90%. |
| False Detection | False detection in the absence of objects approaching vehicle of less than 10%. |