background image
ISO/IEC 10918-1 : 1993(E)
TISO0690-93/d005
DC
DC
DC
Block
Block
AC
AC
AC
AC
i - 1
i
01
07
70
77
i - 1
i
i - 1
i
DIFF = DC - DC
Differential DC encoding
Zig-zag order
Figure 5 ­ Preparation of quantized coefficients for entropy encoding
FIGURE 5 [D05] 8 cm = 313 %
TISO0700-93/d006
DCT-based decoder
Table
specifications
Table
specifications
Dequantizer
IDCT
Entropy
decoder
Compressed
image data
Reconstructed
image data
Figure 6 ­ DCT-based decoder simplified diagram
FIGURE 6 [D06] 6,5 cm = 254 %
TISO0710-93/d007
Predictor
Table
specifications
Lossless encoder
Entropy
encoder
Source
image data
Compressed
image data
Figure 7 ­ Lossless encoder simplified diagram
FIGURE 7 [D07] 6,5 cm = 254 %
16
CCITT Rec. T.81 (1992 E)
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