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Hardware and software

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Hardware and software. interface to. vision processing system. Andrew Chou & John Ming Che Lee. Vision Prosthesis System Overview. Seminar Overview. Thesis Project ... – PowerPoint PPT presentation

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Title: Hardware and software


1
Hardware and software
interface to
vision processing system
Andrew Chou John Ming Che Lee
2
Hardware and software interface to vision
processing system
Seminar Overview
Vision Prosthesis System Overview
Thesis Project
Current Progress
Project Plan
3
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
Anatomy of the eye
4
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
Photoreceptor cells
  • Inner-most layer of the retina
  • Rods responsible for vision in dim light
  • Cones are responsible for fine details and
    perception of colours.
  • Intermediate layer consists of bipolar,
    horizontal and amacrine cells
  • Retinal ganglia at front of retina

5
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
Vision Prosthesis Project
  • Restoration of vision impaired by degenerative
    retinal diseases
  • Electrical stimulation of surviving ganglion
    cells via electrode array

6
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
Hardware platforms requirements
  • Capable of running Linux kernel
  • Sufficiently powerful/fast data processing
    (StrongArm)
  • Price
  • Support
  • Interfacing options

7
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
Hardware platforms evaluated
  • PLEB
  • LART
  • Intrinsyc CerfBoard
  • Compaq iPaq
  • A decision was made to continue development on
    the PLEB

8
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
PLEB
  • Intel StrongArm SA-1100 microprocessor
  • Small, Flexible, Low-Power system
  • Capable of a high level of processing power
  • Developed at CSE of UNSW
  • Supports NFS

9
Hardware and software interface to vision
processing system
Vision Prosthesis System Overview
NFS
  • Network File System
  • Allow machines to mount a disk partition on a
    remote machine as if it were on a local hard
    drive
  • Supported by PLEB

10
Hardware and software interface to vision
processing system
Thesis Project
Top Level Design
  • PLEB to Transmitter/Stimulation Interface
  • Image Data Transmission Protocol

11
Hardware and software interface to vision
processing system
Thesis Project
Detailed Data Pathway
12
PLEB to Transmitter Interface Requirement
Hardware and software interface to vision
processing system
Current Progress
  • Flat out Stimulation rate at the transmission
    end.
  • 0.5 ms (bi-phasic pulses) x 2 0.2 ms (ASIC
    programming time/stimulation) 1.2 ms /
    electrode.
  • 50 of pixels per frame(50 electrodes)
    stimulation gives 60 ms/frame which is approx
    16 frames/s
  • Each pixel is 70 bit in depth, thus the data
    transfer rate required is around 58 kbps.

13
PLEB to Transmitter Interface Options
Hardware and software interface to vision
processing system
Current Progress
  • Direct GPIO Interfacing
  • Follow on T.Ks PCMICA approach
  • Direct Memory Bus Interfacing

14
Simple Design 1
Hardware and software interface to vision
processing system
Current Progress
15
Simple Design 2
Hardware and software interface to vision
processing system
Current Progress
16
Image Data Transmission Protocol
Hardware and software interface to vision
processing system
Current Progress
  • RS232 Serial Protocol.
  • Using command rz in Linux, with open source code
    in hand to develop our own communication
    protocol.
  • Philips ISP1161.
  • Full-speed USB single-chip host and device

17
Problems to be resolved
Hardware and software interface to vision
processing system
Project Plan
  • Final decision about the interfacing method
    between PLEB and the transmitter.
  • Protocol design on image data transmission.
  • How to design and produce a schematic and PCB
    design for the Digital I/O card (if required)

18
Hardware and software interface to vision
processing system
Project Plan
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