7 - MulitimediaComputing OnlineLecture7 LearningObjectives:...

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Mulitimedia Computing Online Lecture-7 Learning Objectives: Data Compression Compression JPEG Standard JPEG 2000 Video Compression Solution to Some Problems Some Recommended  Problems Instructor-in-Charge Dr. Mukesh Kumar  Rohil WILPD, BITS, Pilani Rajasthan Monday, March 15, 2010 1 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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Discrete Cosine Transform (DCT) Equation for DCT : 2 M-1 N-1 (2x+1)u ╥ (2y+1)v ╥ H( u,v) = ——— C(u) C(v) h(x,y) cos ———— cos ———— √( MN) x=0 y=0 2M 2N Where 1/ √2 for γ =0 C( γ )= 1 for γ >0 M x N = Size of the block Monday, March 15, 2010 2 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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Reverse Discrete Cosine Transform   Equation for this : 2 M-1 N-1 (2x+1)u ╥ (2y+1)v ╥ h(x,y) = ——— C(u) C(v) H(u,v) cos ———— cos ———— √( MN) u=0 v=0 2M 2N Where 1/ √2 for γ =0 C( γ )= 1 for γ >0 M x N = Size of the block Monday, March 15, 2010 3 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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Data Compression  JPEG DCT based mode  (Sequential coding) Expanded Lossy DCT- based Mode  (Progressive  encoding) Lossless Mode Hierarchical Mode MPEG Coding Types of frames I, P, B and D frames Motion estimation Audio Coding  (T1.Ch6) PCM DPCM ADPCM -μ-Law Monday, March 15, 2010 4 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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JPEG Compression Standard  … 4 Monday, March 15, 2010 5 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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JPEG Compression Standard  … 5 Main Steps in JPEG Image Compression   Transform RGB to YIQ or YUV and  subsample color.   DCT on image blocks.   Quantization.   Zig-zag ordering and run-length encoding.   Entropy coding. Monday, March 15, 2010 6 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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JPEG Compression Standard  … 12 Monday, March 15, 2010 7 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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JPEG Compression Standard  … 13 DPCM on DC coffiecients   The DC cofficients are coded separately from  the AC ones. Differential Pulse Code Modulation (DPCM)  is  the coding method.   If the DC cofficients for the 5 image blocks are  150, 155, 149, 152, 144, then the DPCM would produce  150, 5,   -6, 3, -8, assuming  di  DCi +1  − DCi and  d 0= DC 0. Monday, March 15, 2010 8 WILPD, B.I.T.S., PILANI EA ZC473 Multimedia Computing On-Line Lecture-7
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JPEG Compression Standard  … 14 Entropy Coding   The DC and AC cofficients usually undergo an entropy  coding step to gain a possible further compression.  
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This note was uploaded on 03/14/2010 for the course CSE EA ZC473 taught by Professor Rahulbanerjee during the Summer '10 term at Birla Institute of Technology & Science.

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7 - MulitimediaComputing OnlineLecture7 LearningObjectives:...

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