Digital Signal Processing Reference
In-Depth Information
Apply the inverse 2D-DCT to determine the 2D data.
14.18.
In JPEG compression, DCT DC coefficients from several blocks are 400, 390, 350, 360, and
370. Use DPCM to produce the DPCM sequence, and use the Huffman table to encode the
DPCM sequence.
14.19.
In JPEG compression, DCT coefficients from the an image subblock are
½
175
;
2
;
0
;
0
;
0
;
4
;
0
;
0
;
37
;
0
;
0
;
0
;
0
;
2
;
0
;
0
;
.
;
0
a. Generate the run-length codes for AC coefficients.
b. Perform entropy coding for the run-length codes using the Huffman table.
14.20. Consider the following grayscale image
pði; jÞ
:
"
10
#
100
200
150
Apply the 2D-DWT using the Haar wavelet to determine the level-1 DWT coefficients.
14.21. Consider the following level-1 IDWT coefficients
Wðu; vÞ
obtained using the Haar wavelet:
"
200
#
10
10
0
Apply the IDWT to determine the 2D data.
14.22. Consider the following grayscale image
pði; jÞ
:
2
4
3
5
100
150
60
80
80
90
50
70
110
120
100
80
90
50
40
90
Apply the 2D-DWT using the Haar wavelet to determine the level-1 DWT coefficients.
14.23. Consider the following level-1 IDWT coefficients
Wðu; vÞ
obtained using the Haar wavelet:
2
4
3
5
250
50
30
20
30
20
10
20
10
20
0
0
20
15
0
0
Apply the IDWT to determine the 2D data.
14.24. Explain the difference between horizontal retrace and vertical retrace. Which one would
take more time?
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