background image
ISO/IEC 10918-1 : 1993(E)
Annex K
Examples and guidelines
(This annex does not form an integral part of this Recommendation | International Standard)
This annex provides examples of various tables, procedures, and other guidelines.
K.1
Quantization tables for luminance and chrominance components
Two examples of quantization tables are given in Tables K.1 and K.2. These are based on psychovisual thresholding and
are derived empirically using luminance and chrominance and 2:1 horizontal subsampling. These tables are provided as
examples only and are not necessarily suitable for any particular application. These quantization values have been used
with good results on 8-bit per sample luminance and chrominance images of the format illustrated in Figure 13. Note that
these quantization values are appropriate for the DCT normalization defined in A.3.3.
If these quantization values are divided by 2, the resulting reconstructed image is usually nearly indistinguishable from the
source image.
Table K.1 Luminance quantization table
16
11
10
16
1
24
1
40
1
51
1
61
12
12
14
19
1
26
1
58
1
60
1
55
14
13
16
24
1
40
1
57
1
69
1
56
14
17
22
29
1
51
1
87
1
80
1
62
18
22
37
56
1
68
109
103
1
77
24
35
55
64
1
81
104
113
1
92
49
64
78
87
103
121
120
101
72
92
95
98
112
100
103
1
99
Table K.2 Chrominance quantization table
17
18
24
47
99
99
99
99
18
21
26
66
99
99
99
99
24
26
56
99
99
99
99
99
47
66
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
99
CCITT Rec. T.81 (1992 E)
143
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] [129] [130] [131] [132] [133] [134] [135] [136] [137] [138] [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] [149] [150] [151] [152] [153] [154] [155] [156] [157] [158] [159] [160] [161] [162] [163] [164] [165] [166] [167] [168] [169] [170] [171] [172] [173] [174] [175] [176] [177] [178] [179] [180] [181] [182] [183] [184] [185] [186]