1

Final Project

吳佑焉陳建宏陳方玉柯鴻洋

第八組

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Outline

Architecture of JPEG encoder

Forward DCT algorithm review

MYIP design

Problem we met

Conclusion

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JPEG Encoding

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RGB => YUV

128)*439.0()*291.0()*148.0(

128)*071.0()*368.0()*439.0(

16)*098.0()*504.0()*257.0(

BGR

BGR

BGR

U

V

Cb

Cr

Y

Y-Luminance(亮度 )

Cb,Cr-Chrominance domain(色差 )

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Forward DCT

43

52

61

70

1357

3715

5173

7531

7

5

3

1

43

52

61

70

6226

4444

2662

4444

6

4

2

0

2

1

2

1

ff

ff

ff

ff

CCCC

CCCC

CCCC

CCCC

F

F

F

F

ff

ff

ff

ff

CCCC

CCCC

CCCC

CCCC

F

F

F

F

16cos,

kCwhere k

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MYIP design

MYIP includes RGB2YUV and DCT transform

control

DCT RGB2YUV

MYIP

HADDR[7] HADDR

HWDATA

HRDATA

HREADYOUT

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Modified files

Verilog file MYIP.v

CPP files Before.cpp Driver.cpp Rgbdriver.cpp

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MYIP.v file

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MYIP.v file cont.

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MYIP.v file cont.

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Rgbdriver.cpp

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Driver.cpp

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Before.cpp

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Problem we met

Prob1 The modified before.cpp downloaded form web

site has some problem in image quality

Prob2 RGB to YUV coefficients from the transform m

atrix is not consistent with standard

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Prob1:Image quality

Original 256x256 BMP

Size=193KB

compressed 256x256 JPG using software code,Size=13.2KB

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Prob2:coefficient is not consistent

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Compression with RGB2YUV and DCT using hardware realization

Original 256x256 BMP

Size=193KB

Compressed 256x256 jpeg

Size=8.24KB

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Conclusion and future work

Conclusion How to partition the software and hardware

effect to our jpeg platform design A good solution to our jpeg design

methodology is a key issue

Future work Benchmark which design component which

affects the performance mostly Using hardware to implement quantization