Snapshot - PowerPoint PPT Presentation

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Snapshot

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Snapshot. Mike Huhs. Sanjay Jhaveri. Project. Digital Camera. User Interface. Compression and Storage ... Camera Video. Capture. Click! Display. Capture ... – PowerPoint PPT presentation

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Provided by: sjha5
Learn more at: http://web.mit.edu
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Title: Snapshot


1
Snapshot
  • Mike Huhs
  • Sanjay Jhaveri

2
Project
  • Digital Camera
  • User Interface
  • Compression and Storage

3
Display
Live Video
Shoot Button
Capture
Camera Video
Cursor
Last Picture
4
Display
Capture
Click!
Camera Video
5
Display
Capture
6
Display
Capture
Live Video
7
Storage
ZBT Ram 1
ZBT Ram 2
Click!
Your Picture
Compression
Row, Column Address
8
Block Diagram
Xvga signals
XVGA
line, column
Data, Address
NTSC Decode
NTSC
Address
Write Control
Read Control
YCrCb
RAM
A/D
RGB
Data
YCrCb
Compressed Image
Controls
Image
RGB Convert
Image Compression
Control
Controls
User Inputs
Mouse
9
Image Compression
  • 2D Discrete Cosine Transform decomposes image
    into frequency components
  • Apply 1D transform to rows and then to columns
  • Separately transform 8 x 8 blocks of image
  • Eye acts as natural low pass filter
  • Only store low frequency components of image
  • 180 150 23 12 5 2 1 2
  • 130 125 54 22 8 3 5 4
  • 77 45 19 4 2 0 3
  • 33 21 15 8 4 3 1
  • 9 12 5 1 2 5 0
  • 13 7 10 8 6 2 2
  • 3 4 6 2 1 3 0
  • 5 2 8 3 1 2 5 0

8 x 8 pixels
8x8 Input Matrix
8x8 Transform Matrix
1D DCT
1D DCT
Transpose
10
Image Compression
data_in
From read module
DCT Memory Control
data_in valid
get picture
From control
delete picture
To read module
data_out
data_out valid
ZBT RAM
idct
idct
idct
dct
dct
dct
  • ZBT Ram can store 5-6 pictures

11
Possible Additions
  • Visual effects such as zoom, rotate, and blur
  • Watermarked symbol that appears after processing
    the image

12
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