Bender pdr
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The document outlines a student team's plan to implement a night vision system using a CCD imaging sensor. The objectives are to provide low-light vision, still image capture, and VGA video output. Key components include an optical lens, infrared-sensitive CCD sensor, RAM for image storage, microcontroller for control and computer interface, and VGA output. Tasks are divided among team members. Risks include the lens being too expensive, the CCD not being sensitive enough, and the system not achieving the necessary bandwidth. Contingency plans are made to address each risk.
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Bender pdr
- 1. Night VisionJames Stacy Brian Herre Maurio Grando Eric Faller Chris Bawiec James Team Bender
- 2. Objectives • Implement A CCD (Charge Coupled Device) Imaging System • Provide VGA Output • Provide User Interface James
- 3. Goals • Low Light Vision • Still Image Capture James
- 6. Functions • User Interface: • Computer Interface via RS-232 • Still Image Output via RS-232 • Output Video Stream via VGA James
- 7. Possible Use • Surveillance • Search and Rescue • Property Management James
- 10. Additional Functionality • X-Ray Vision • Motion Sensing • Anti-Saturation Brian
- 12. Outline of Approach Optics Sensors Storage Video Out HC11 Computer Brian
- 13. 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
- 14. Further details Filters lens • Needed to focus light onto CCD sensor •Need to optimize distance between lens and CCD •More research is needed •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
- 15. 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. $25 Maurio
- 16. 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
- 17. Video & Computer interfaces 512K x 8 2-port RAM To CCD subsystem Bus 68HC11 μController 32K RAM 32K RO M VGA logic VGA output RS-232 interface Input commands Still image data Computer workstation Status LEDs Eric
- 18. HC11 Microcontroller • Standard Capstone component • Controls other components – Disables video while taking still shots • Interface to computer – Reads input commands – Uploads images Eric
- 19. 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
- 20. 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
- 21. Division of Labor • Lens/Sensor - Maurio, Brian • RAM/FPGA - Maurio, James • VGA output – James, Chris • Microcontroller – Brian, Eric • Software - Eric, Chris Chris
- 22. Schedule Chris
- 23. 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
- 24. 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
- 25. Questions ?