Image processing device and image processing method
Provided is an image processing device including a selection section configured to select, from a plurality of transform units with different sizes, a transform unit used for inverse orthogonal transformation of image data to be decoded, a generation section configured to generate, from a first quantization matrix corresponding to a transform unit for a first size, a second quantization matrix corresponding to a transform unit for a second size from a first quantization matrix corresponding to a transform unit for a first size, and an inverse quantization section configured to inversely quantize transform coefficient data for the image data using the second quantization matrix generated by the generation section when the selection section selects the transform unit for the second size.
1. An image processing device comprising:
circuitry configured to:
quantize transform coefficient data for 16×16 transform unit using a 16×16 quantization matrix to generate quantized transform coefficient data, the 16×16 quantization matrix set by performing a nearest neighboring process including duplicating at least one of two elements adjacent to each other in an 8×8 quantization matrix; and
encode the quantized transform coefficient data to generate a bit stream including the 8×8 quantization matrix as a parameter set.
2. The image processing device according to claim 1 , wherein the circuitry is configured to generate the bit stream including the 8×8 quantization matrix as a picture parameter set.
3. The image processing device according to claim 1 , wherein the circuitry is configured to set the 16×16 quantization matrix by performing the nearest neighboring process including duplicating at least one of two elements adjacent to each other in the 8×8 quantization matrix.
4. The image processing device according to claim 1 , wherein the circuitry is configured to quantize the transform coefficient data using the 16×16 quantization matrix (QM1) set by performing the nearest neighboring process on the elements in the 8×8 quantization matrix (QM2):
QM
1
=
(
a
00
a
00
a
10
a
10
a
20
a
20
a
30
a
30
a
40
a
40
a
50
a
50
a
60
a
60
a
70
a
70
a
00
a
00
a
10
a
10
a
20
a
20
a
30
a
30
a
40
a
40
a
50
a
50
a
60
a
60
a
70
a
70
a
01
a
01
a
11
a
11
a
21
a
21
a
31
a
31
a
41
a
41
a
51
a
51
a
61
a
61
a
71
a
71
a
01
a
01
a
11
a
11
a
21
a
21
a
31
a
31
a
41
a
41
a
51
a
51
a
61
a
61
a
71
a
71
a
02
a
02
a
12
a
12
a
22
a
22
a
32
a
32
a
42
a
42
a
52
a
52
a
62
a
62
a
72
a
72
a
02
a
02
a
12
a
12
a
22
a
22
a
32
a
32
a
42
a
42
a
52
a
52
a
62
a
62
a
72
a
72
a
03
a
03
a
13
a
13
a
23
a
23
a
33
a
33
a
43
a
43
a
53
a
53
a
63
a
63
a
73
a
73
a
03
a
03
a
13
a
13
a
23
a
23
a
33
a
33
a
43
a
43
a
53
a
53
a
63
a
63
a
73
a
73
a
04
a
04
a
14
a
14
a
24
a
24
a
34
a
34
a
44
a
44
a
54
a
54
a
64
a
64
a
74
a
74
a
04
a
04
a
14
a
14
a
24
a
24
a
34
a
34
a
44
a
44
a
54
a
54
a
64
a
64
a
74
a
74
a
05
a
05
a
15
a
15
a
25
a
25
a
35
a
35
a
45
a
45
a
55
a
55
a
65
a
65
a
75
a
75
a
05
a
05
a
15
a
15
a
25
a
25
a
35
a
35
a
45
a
45
a
55
a
55
a
65
a
65
a
75
a
75
a
06
a
06
a
16
a
16
a
26
a
26
a
36
a
36
a
46
a
46
a
56
a
56
a
66
a
66
a
76
a
76
a
06
a
06
a
16
a
16
a
26
a
26
a
36
a
36
a
46
a
46
a
56
a
56
a
66
a
66
a
76
a
76
a
07
a
07
a
17
a
17
a
27
a
27
a
37
a
37
a
47
a
47
a
57
a
57
a
67
a
67
a
77
a
77
a
07
a
07
a
17
a
17
a
27
a
27
a
37
a
37
a
47
a
47
a
57
a
57
a
67
a
67
a
77
a
77
)
QM
2
=
(
a
00
a
10
a
20
a
30
a
40
a
50
a
60
a
70
a
01
a
11
a
21
a
31
a
41
a
51
a
61
a
71
a
02
a
12
a
22
a
32
a
42
a
52
a
62
a
72
a
03
a
13
a
23
a
33
a
43
a
53
a
63
a
73
a
04
a
14
a
24
a
34
a
44
a
54
a
64
a
74
a
05
a
15
a
25
a
35
a
45
a
55
a
65
a
75
a
06
a
16
a
26
a
36
a
46
a
56
a
66
a
76
a
07
a
17
a
27
a
37
a
47
a
57
a
67
a
77
)
.
5. An image processing method comprising:
quantizing, via circuitry of an image processing device, transform coefficient data for 16×16 transform unit using a 16×16 quantization matrix to generate quantized transform coefficient data, the 16×16 quantization matrix set by performing a nearest neighboring process including duplicating at least one of two elements adjacent to each other in an 8×8 quantization matrix; and
encoding the quantized transform coefficient data to generate a bit stream including the 8×8 quantization matrix as a parameter set.
6. The image processing method according to claim 5 , further comprising generating the bit stream including the 8×8 quantization matrix as a picture parameter set.
7. The image processing method according to claim 5 , further comprising setting set the 16×16 quantization matrix by performing the nearest neighboring process including duplicating at least one of two elements adjacent to each other in the 8×8 quantization matrix.
8. The image processing method according to claim 5 , wherein quantizing includes quantizing, via the circuitry, the transform coefficient data using the 16×16 quantization matrix (QM1) set by performing the nearest neighboring process on the elements in the 8×8 quantization matrix (QM2):
QM
1
=
(
a
00
a
00
a
10
a
10
a
20
a
20
a
30
a
30
a
40
a
40
a
50
a
50
a
60
a
60
a
70
a
70
a
00
a
00
a
10
a
10
a
20
a
20
a
30
a
30
a
40
a
40
a
50
a
50
a
60
a
60
a
70
a
70
a
01
a
01
a
11
a
11
a
21
a
21
a
31
a
31
a
41
a
41
a
51
a
51
a
61
a
61
a
71
a
71
a
01
a
01
a
11
a
11
a
21
a
21
a
31
a
31
a
41
a
41
a
51
a
51
a
61
a
61
a
71
a
71
a
02
a
02
a
12
a
12
a
22
a
22
a
32
a
32
a
42
a
42
a
52
a
52
a
62
a
62
a
72
a
72
a
02
a
02
a
12
a
12
a
22
a
22
a
32
a
32
a
42
a
42
a
52
a
52
a
62
a
62
a
72
a
72
a
03
a
03
a
13
a
13
a
23
a
23
a
33
a
33
a
43
a
43
a
53
a
53
a
63
a
63
a
73
a
73
a
03
a
03
a
13
a
13
a
23
a
23
a
33
a
33
a
43
a
43
a
53
a
53
a
63
a
63
a
73
a
73
a
04
a
04
a
14
a
14
a
24
a
24
a
34
a
34
a
44
a
44
a
54
a
54
a
64
a
64
a
74
a
74
a
04
a
04
a
14
a
14
a
24
a
24
a
34
a
34
a
44
a
44
a
54
a
54
a
64
a
64
a
74
a
74
a
05
a
05
a
15
a
15
a
25
a
25
a
35
a
35
a
45
a
45
a
55
a
55
a
65
a
65
a
75
a
75
a
05
a
05
a
15
a
15
a
25
a
25
a
35
a
35
a
45
a
45
a
55
a
55
a
65
a
65
a
75
a
75
a
06
a
06
a
16
a
16
a
26
a
26
a
36
a
36
a
46
a
46
a
56
a
56
a
66
a
66
a
76
a
76
a
06
a
06
a
16
a
16
a
26
a
26
a
36
a
36
a
46
a
46
a
56
a
56
a
66
a
66
a
76
a
76
a
07
a
07
a
17
a
17
a
27
a
27
a
37
a
37
a
47
a
47
a
57
a
57
a
67
a
67
a
77
a
77
a
07
a
07
a
17
a
17
a
27
a
27
a
37
a
37
a
47
a
47
a
57
a
57
a
67
a
67
a
77
a
77
)
QM
2
=
(
a
00
a
10
a
20
a
30
a
40
a
50
a
60
a
70
a
01
a
11
a
21
a
31
a
41
a
51
a
61
a
71
a
02
a
12
a
22
a
32
a
42
a
52
a
62
a
72
a
03
a
13
a
23
a
33
a
43
a
53
a
63
a
73
a
04
a
14
a
24
a
34
a
44
a
54
a
64
a
74
a
05
a
15
a
25
a
35
a
45
a
55
a
65
a
75
a
06
a
16
a
26
a
36
a
46
a
56
a
66
a
76
a
07
a
17
a
27
a
37
a
47
a
57
a
67
a
77
)
.