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Page 1: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

Snapshot

Mike HuhsSanjay Jhaveri

Project

Digital CameraUser InterfaceCompression and Storage

Display

Camera Video

LastPicture

Capture

LiveVideo

ShootButton

Cursor

Page 4: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

Display

Camera VideoCapture

Click!

Page 5: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

Display

Capture

Page 6: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

Display

Capture

LiveVideo

Page 7: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

StorageZBT Ram 1 ZBT Ram 2

Click!

YourPicture

Compression

Row, Column =Address

Block Diagram

A/D RAM

ImageCompression

NTSCDecode

WriteControl

ReadControl

Control

XVGA

RGBConvert

Mouse

NTSC YCrCbData,

Address

Data

Address

RGB

line,column

Xvgasignals

YCrCbImage

Controls

CompressedImage

Controls

UserInputs

Page 9: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

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

1D DCT 1D DCTTranspose

8x8 Input Matrix 8x8 Transform Matrix

8 x 8pixels

180 150 23 12 5 2 1 2130 125 54 22 8 3 5 489 77 45 19 4 2 0 345 33 21 15 8 4 3 122 9 12 5 1 2 5 017 13 7 10 8 6 2 28 3 4 6 2 1 3 05 2 8 3 1 2 5 0

Image Compression

ZBT Ram can store ~ 5-6 pictures

dct

idct

ZBT RAM

DCT & Memory Control

data_out valid

data_out

get picture

data_in

data_in valid

From readmodule

To readmodule

Fromcontrol delete picture

Page 11: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

Possible Additions

Visual effects such as zoom, rotate, andblur

Watermarked symbol that appears afterprocessing the image

Page 12: 6.111 Final Project Presentation Sanjay Mikeweb.mit.edu/6.111/www/s2006/PROJECT/13/Presentation13.pdf · Image Compression • 2D Discrete Cosine Transform: decomposes image into

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