Team Bender
Night Vision
James Stacy
Brian Herre
Maurio Grando
Eric Faller
Chris Bawiec
James
Objectives
• Implement A CCD (Charge Coupled
Device) Imaging System
• Provide VGA Output
• Provide User Interface
James
Goals
• Low Light Vision
• Still Image Capture
James
Resource Management
James
Commercially Available Models
James
Functions
• User Interface:
• Computer Interface via RS-232
• Still Image Output via RS-232
• Output Video Stream via VGA
James
Possible Use
• Surveillance
• Search and Rescue
• Property Management
James
Biological Applications
James
Surveillance
James
Additional Functionality
• X-Ray Vision
• Motion Sensing
• Anti-Saturation
Brian
Night Vision System
Brian
Outline of Approach
Optics
Sensors
Storage
Video Out
HC11
Computer
Brian
I/O of System Blocks
•
Optics (lens)
– Input: Photons from the environment
– Output: Focused light
•
Infrared Sensors
– Input: Infrared Information
– Output: Digital Image Data
•
HC11
– Input: Computer commands
-Turn on, Test Connection, Take a picture, etc.
RAM
- Still Image Data
– Output: Still Image
•
Video Out
– Input: Digital Image Data
– Output: Video Image
Brian
Further details
lens
• Needed to focus light onto CCD sensor
•Need to optimize distance between lens and CCD
•More research is needed
Filters
•Not needed in dark areas
•Still useful for dimly lit areas
•Filter types: red #25 (transparent),
infrared #89b (nearly opaque), and
infrared #87c (completely opaque).
Maurio
CCD
Example of an affordable CCD
Question:
•How can we tell if the CCD is sensitive enough to near infrared light
emitted from objects in a dark room?
We know that companies sell LED’s in a wide range of
frequencies in the infrared spectrum.
These can be used the “light up” the room with infrared light at a
frequency (more or less) of our choice.
Maurio
Transfer the info
We don’t know how fast the CCD will transfer the data yet so..
•We feed the output of the CCD into some gate logic (like an
FPGA)
•This gate logic in turn feeds the incoming picture into a 2-port
RAM and stores it there.
Maurio
Video & Computer interfaces
512K x 8
2-port RAM
Bus
To CCD
subsystem
68HC11
μController
VGA
RS-232
logic
interface
32K
32K
RAM
ROM
Status
LEDs
Computer workstation
VGA
output
Still image data
Input commands
Eric
HC11 Microcontroller
• Standard Capstone component
• Controls other components
– Disables video while taking still shots
• Interface to computer
– Reads input commands
– Uploads images
Eric
VGA Output
• Real-time preview of image
• Driven either by software or logic
• Framerate & resolution will depend on
component speeds
– 640x480 @ 60 FPS = 18 MB/sec
– 320x240 @ 30 FPS = 2 MB/sec
– 160x120 @ 30 FPS = 0.5 MB/sec
Eric
Computer interface
• RS-232 provided by microcontroller
• Download software updates
• Upload still images to computer
• Send commands to camera
– Reset
– Enable/disable video preview
– Take picture
Eric
Division of Labor
• Lens/Sensor - Maurio, Brian
• RAM/FPGA - Maurio, James
• VGA output – James, Chris
• Microcontroller – Brian, Eric
• Software - Eric, Chris
Chris
Schedule
Chris
Risks
• Lens – too expensive
• CCD – not sensitive enough to infrared
• VGA – Bandwidth too high for
component speeds
• HC11 – Can’t get it performing all
necessary tasks.
Chris
Contingency Plan
• Lens – Find a low grade camera lens
• CCD – Take picture at different
frequency
• VGA – Output at lower frame rate
• HC11 – Simplify HC11’s tasks
Chris
Questions
?