CN1741108A - 抖动方法和设备 - Google Patents
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Abstract
本发明提供了一种处理视频数据的方法。应该减小当将抖动施加于转移函数时出现的噪声。因此,将第一输出值和第二输出值与转移函数的离散输入值相关联(S1)。根据给定数量的抖动比特,选择等于和/或在所述第一输出值和所述第二输出值之间、使用最少数量的抖动比特的中间值(S2)。最后将这个中间值用作离散输入值的输出值(S3)。因此,可以显著地减小抖动噪声。
Description
技术领域
本发明涉及一种对用于处理视频数据的转移函数施加抖动(dithering)的方法。而且,本发明还涉及用于对视频数据施加抖动的对应设备。
背景技术
PDP(等离子体显示板)使用仅能够为“ON(导通)”或“OFF(截止)”的放电室的矩阵阵列。不同于在CRT或LCD中由发射光的模拟控制来表示灰度级,PDP通过调制每帧的光脉冲(维持脉冲)数量来控制灰度级。在与眼睛反应时间对应的时间段中由眼睛将这种时间调制进行结合。因为以给定频率的光脉冲的数量来描绘视频幅度,所以更大的幅度意味着更多的光脉冲,从而更多的“ON”时间。为此,这种调制也被称为PWM—脉冲宽度调制。
这种PWM引起一个PDP图像质量问题:较差的灰度级描绘质量,特别是在画面的较暗区域。确实,与亮度近似与所施加的阴极电压成平方比的CRT相反,PDP的亮度与放电脉冲的数量成线性关系。因此必须将近似数字二次的去伽玛(degamma)函数施加到视频(通常由查询表来完成)。
抖动是一种公知技术,其用于减少由于所显示的分辨率比特的有限数量而引起的量化效应。主要有两种抖动用于PDP:
-矩阵抖动(比较在专利申请EP1269457中的基于单元的抖动,和在专利申请EP1262947中的其增强版多屏蔽(Multi-Mask)抖动),其改进了灰度级描绘但是加入了一些抖动模式(结构噪声)。
-误差扩散,其改进了灰度级描绘并且不产生抖动模式,但加入了一些噪声。
本发明示教的目的是减小与矩阵抖动一同出现的抖动噪声。但是这里所说明的方法不能减小误差扩散噪声。
原则上,矩阵抖动可以恢复与期望一样多的比特。但是,抖动噪声频率减小,并且由此随着抖动比特数量的增加,噪声变得更加明显。在实施矩阵抖动中,因为使用的比特越多则模式越明显,所以最多可以使用3比特的抖动。
这种现象的原因是如果将3比特用于抖动,将有8种不同的抖动模式,如图1种所示,并且模式的重复时间需要8个时钟单元。因此,抖动模式的重复频率低。如果将多于3比特用于抖动,重复频率将会非常小以至不能接受。如果只使用2比特的抖动,则抖动模式的重复频率将会是3比特抖动的重复频率的两倍高。
另一方面是如果使用3比特的抖动,则1/2的模式(第一抖动比特)是非常不明显的,1/4和3/4的模式(第二抖动比特)要稍稍更明显一些,而1/8、3/8、5/8和7/8的模式(第三抖动比特)可能更加明显和不好(比较于图1)。例如,在标准的基于单元的抖动(专利申请EP1269457)的情况中,4帧抖动的合成(integration)得出了图1所示的级别。
在4×4矩阵抖动块的每个单元中的值0、1/4、1/2、3/4和1意味着在4帧期间将级别1激活0、1、2、3或4次。根据这个例子,级别1/8、3/8、5/8和7/8不如抖动的其他模式细微(并且更加明显和麻烦)。
在图2中示出了在编码步骤前数据处理的典型块结构。将8比特输入数据YI馈送到去伽玛块1。在查询表LUT#1的帮助下,实现去伽玛函数。将11比特的输出信号YA发送到矩阵抖动块2。将来自矩阵抖动块2的8比特输出信号YB输入到施加第二查询表LUT#2的码转换块3。在编码步骤之后产生的输出信号包括16比特数据。
由其中出现抖动比特的去伽玛LUT来做出抖动模式的选择。矩阵抖动块只施加与抖动比特对应的矩阵模式。
问题是在低级别中抖动比特是真正需要的(因为去伽玛函数),但是在较高的级别中,它们不是真正必要的,并且由于它们只增加一些模式而没有增加级别所以相反可能不需要它们。可以用例子来更好地说明。定义了去伽玛函数如下:
其中YI是输入数据而YA是去伽玛块1的输出数据。γ是去伽玛函数的常用指数。在例子中γ=2.2。
即使用3比特的抖动,在0和21之间的一些级别也具有相同的输出,其意味着级别的损失。但是在级别122后,即使没有抖动所有的输出也不同。这意味着,没有抖动就没有级别损失,但是没有抖动量化噪声就更多。
在较高的级别中,抖动对于减小量化噪声可能有用,但是不必有3比特的抖动。然而,例如表1中所示,在182和189之间的输入级别都使用第三比特的抖动,表1是从附录中所给出的表3中提取的。
输入 | 输出 |
8比特 | 8.3比特 |
182 | 121,375 |
183 | 122,875 |
184 | 124,375 |
185 | 125,875 |
186 | 127,375 |
187 | 128,875 |
188 | 130,375 |
189 | 131,875 |
表1
所以对这些高级别使用抖动模式是不好的。
发明内容
所以,本发明的目的是提供一种方法和设备,它们使能改进量化步骤的抖动。
根据本发明,通过将转移函数施加于视频数据、将抖动施加于所述转移函数来处理所述视频数据的方法而实现这个目的。为了将所述抖动施加于转移函数,所述方法包括下面步骤:
通过将第一输出值和第二输出值与转移函数的离散输入值相关联,而将抖动施加于用于处理视频数据的所述转移函数,
选择等于和/或在所述第一输出值和第二输出值之间、使用最少数量的抖动比特的中间值,以及
将所述中间值用作所述离散输入值的输出值。
例如,如果输出值为12.125和12.875,则等于和/或在这些输出值之间的值是:
12.125(十进制)等于1100.001(浮点数的二进制表示),
12.25(十进制)等于1100.01(二进制),
12.375(十进制)等于1100.011(二进制),
12.5(十进制)等于1100.1(二进制),
12.625(十进制)等于1100.101(二进制),
12.75(十进制)等于1100.11(二进制)
12.875(十进制)等于1100.111(二进制)
使用最少数量比特的中间值是12.5。
而且,提供一种用于处理视频数据设备,该设备具有用于将转移函数施加于所述视频数据的处理装置和用于将抖动施加于所述转移函数的抖动装置,其中所述抖动装置将第一输出值和第二输出值与所述转移函数的离散输入值相关联,选择等于和/或在所述第一输出值和所述第二输出值之间、使用最少数量的抖动比特的中间值,而且将所述中间值用作所述离散输入值的输出值。
本发明方法和设备的优点是可以显著地减少抖动噪声。
转移函数可以是去伽玛函数。去伽玛函数的量化效应通常是令人烦扰的。因此,去伽玛函数值的改进的抖动具有非常好的效果。
可以通用查询表来改进转移函数。这样的LUT(查询表)改进了处理速度。
在具体实施例中,通过修改转移函数的参数来计算第一和第二输出值。特别是,可以修改转移函数的输入参数。可以通过对该参数加减修改的值来执行修改,从而通过修改的值来获得第一和第二输出值。由此,可以确定可接受的误差。
如果存在多个中间值,它们带有相同最少数量的所用抖动比特,则选择较接近离散函数值的值作为中间值。由此,进一步避免了误差。
附图说明
用所附附图来说明本发明,其中:
图1示出了矩阵抖动块,其用于基于单元的抖动;
图2示出了根据现有技术,在编码步骤前进行数据处理的方框图;和
图3示出了本发明方法的流程图。
具体实施方式
本发明基于下面知识。
与输入上的小误差对应的、输入的仅为0.05的小偏移,会导致使用仅仅1比特抖动的级别。所以可以在不增加显著的量化噪声的情况下避免在表1中指示的较差的抖动模式,如在下面表2中所示。
输入 | 输出 |
8.3比特 | |
182,05 | 121,5 |
183,05 | 123 |
184,05 | 124,5 |
185,05 | 126 |
186,05 | 127,5 |
187,05 | 129 |
188,05 | 130,5 |
189,05 | 132 |
表2
实际上从全局来说,舍入处理使得通过抖动所增加的值等于0/8,1/8,2/8,3/8,4/8,5/8,6/8,或7/8的任何一个的概率对于所有级别都相同。所以原则上,使用第三抖动比特(即通过抖动所增加的值等于1/8,3/8,5/8或7/8)的级别的概率为1/2。
当产生去伽玛LUT,总存在舍入误差。现在,思路是操控这个误差以特许更好的抖动模式。换句话说,必须估计和限制误差。
不容易估计在输出上的误差(量化误差),这是因为这个误差在较高级别中总是比在较低级别中相对较小(在标准编码的情况下)。在重心编码(比较专利申请EP1256924)或元代码(Metacode)(比较专利申请EP1353315)的情况中,估计更差,这是因为级别的非统一分布和所产生的量化误差的非统一性。
为此,考虑在输入上的误差比较容易。具体地说,估计和限制误差比较容易。
所以在图3中所示的第一步骤S1将决定可接受的误差的极限τ。τ的可能值可以是0,1。如下定义了去伽玛函数的两个极限曲线:
用这两个极限曲线,可以为每个输入值YI定义不同于值YA的两个输出值Y-τ和Y+τ在附录中给出的表3示出了去伽玛块1的对应的输入值YI(第一列)和输出值YA(第二和第五列)。表3的第三和第四列代表极限曲线的值Y-τ和Y+τ。每个去伽玛输出值包括8比特整数和3比特抖动值。
根据本发明,为每个输入值选择使用最少抖动比特的、在值Y-τ和Y+τ之间的中间值(比较于步骤S2)。例如可以在输入值20和30的行中所看见的。为所考虑的输入值YI选择所述中间值作为输出值。当存在具有相同数量的抖动比特的不同值时,必须选择较接近于实际值的值。但是,如果对于实际输入值在值Y-τ和Y+τ之间存在比值Y-τ和Y+τ小的抖动的输出值,则必须选择这个值。输入值146的行示出了这样的例子。此外,必须考虑尽可能使用不同的输出值(比较输入值26和27的优化输出值)。
用标准方法(比较表3的第二列),131个级别(分别为61,28和36)正在使用第三抖动比特(分别为第二、第一和没有抖动比特),而本发明优化方法只有28(分别63和70和95)。
在不进行硬件改动的情况下,可以将本发明应用于现今可获得的处理设备,这是因为只需要改变LUT的内容。但是,先进的处理设备能够自动地计算优化的LUT。在这种情况下,需要特殊的计算装置来执行图3中所示的方法。
附录
表3
(Y=2,2和τ=0,1)
去伽玛输出(8.3比特) | ||||||
输入(8比特) | 没有优化 | Y-T | Y+T | 使用优化 | ||
0 | 0 | 0 | 0 | 0 | ||
1 | 0 | 0 | 0 | 0 | ||
2 | 0 | 0 | 0 | 0 | ||
3 | 0 | 0 | 0 | 0 | ||
4 | 0 | 0 | 0 | 0 | ||
5 | 0 | 0 | 0 | 0 | ||
6 | 0,125 | 0,125 | 0,125 | 0,125 | ||
7 | 0,125 | 0,125 | 0,125 | 0,125 | ||
8 | 0,125 | 0,125 | 0,125 | 0,125 | ||
9 | 0,125 | 0,125 | 0,125 | 0,125 | ||
10 | 0,25 | 0,25 | 0,25 | 0,25 | ||
11 | 0,25 | 0,25 | 0,25 | 0,25 | ||
12 | 0,25 | 0,25 | 0,25 | 0,25 | ||
13 | 0,375 | 0,375 | 0,375 | 0,375 | ||
14 | 0,375 | 0,375 | 0,375 | 0,375 | ||
15 | 0,5 | 0,5 | 0,5 | 0,5 | ||
16 | 0,625 | 0,625 | 0,625 | 0,625 | ||
17 | 0,625 | 0,625 | 0,625 | 0,625 | ||
18 | 0,75 | 0,75 | 0,75 | 0,75 | ||
19 | 0,875 | 0,875 | 0,875 | 0,875 | ||
20 | 1 | 0,875 | 1 | 1 | ||
21 | 1 | 1 | 1 | 1 | ||
22 | 1,125 | 1,125 | 1,125 | 1,125 | ||
23 | 1,25 | 1,25 | 1,25 | 1,25 | ||
24 | 1,375 | 1,375 | 1,375 | 1,375 | ||
25 | 1,5 | 1,5 | 1,5 | 1,5 | ||
26 | 1,625 | 1,625 | 1,75 | 1,625 | ||
27 | 1,875 | 1,75 | 1,875 | 1,75 | ||
28 | 2 | 2 | 2 | 2 | ||
29 | 2,125 | 2,125 | 2,125 | 2,125 | ||
30 | 2,25 | 2,25 | 2,375 | 2,25 | ||
31 | 2,5 | 2,5 | 2,5 | 2,5 | ||
32 | 2,625 | 2,625 | 2,625 | 2,625 | ||
33 | 2,875 | 2,875 | 2,875 | 2,875 | ||
34 | 3 | 3 | 3 | 3 | ||
35 | 3,25 | 3,25 | 3,25 | 3,25 | ||
36 | 3,375 | 3,375 | 3,5 | 3,5 | ||
37 | 3,625 | 3,625 | 3,625 | 3,625 | ||
38 | 3,875 | 3,875 | 3,875 | 3,875 | ||
39 | 4,125 | 4,125 | 4,125 | 4,125 | ||
40 | 4,375 | 4,25 | 4,375 | 4,25 | ||
41 | 4,625 | 4,5 | 4,625 | 4,5 | ||
42 | 4,875 | 4,75 | 4,875 | 4,75 |
43 | 5,125 | 5 | 5,125 | 5 | ||
44 | 5,375 | 5,375 | 5,375 | 5,375 | ||
45 | 5,625 | 5,625 | 5,625 | 5,625 | ||
46 | 5,875 | 5,875 | 5,875 | 5,875 | ||
47 | 6,125 | 6,125 | 6,25 | 6,25 | ||
48 | 6,5 | 6,5 | 6,5 | 6,5 | ||
49 | 6,75 | 6,75 | 6,75 | 6,75 | ||
50 | 7,125 | 7 | 7,125 | 7 | ||
51 | 7,375 | 7,375 | 7,375 | 7,375 | ||
52 | 7,75 | 7,625 | 7,75 | 7,625 | ||
53 | 8 | 8 | 8,125 | 8 | ||
54 | 8,375 | 8,375 | 8,375 | 8,375 | ||
55 | 8,75 | 8,75 | 8,75 | 8,75 | ||
56 | 9,125 | 9 | 9,125 | 9 | ||
57 | 9,5 | 9,375 | 9,5 | 9,5 | ||
58 | 9,75 | 9,75 | 9,875 | 9,75 | ||
59 | 10,125 | 10,125 | 10,25 | 10,25 | ||
60 | 10,625 | 10,5 | 10,625 | 10,5 | ||
61 | 11 | 10,875 | 11 | 11 | ||
62 | 11,375 | 11,375 | 11,375 | 11,375 | ||
63 | 11,75 | 11,75 | 11,75 | 11,75 | ||
64 | 12,125 | 12,125 | 12,25 | 12,25 | ||
65 | 12,625 | 12,625 | 12,625 | 12,625 | ||
66 | 13 | 13 | 13,125 | 13 | ||
67 | 13,5 | 13,375 | 13,5 | 13,5 | ||
68 | 13,875 | 13,875 | 14 | 14 | ||
69 | 14,375 | 14,375 | 14,375 | 14,375 | ||
70 | 14,875 | 14,75 | 14,875 | 14,75 | ||
71 | 15,25 | 15,25 | 15,375 | 15,25 | ||
72 | 15,75 | 15,75 | 15,875 | 15,75 | ||
73 | 16,25 | 16,25 | 16,375 | 16,25 | ||
74 | 16,75 | 16,75 | 16,875 | 16,75 | ||
75 | 17,25 | 17,25 | 17,375 | 17,25 | ||
76 | 17,75 | 17,75 | 17,875 | 17,75 | ||
77 | 18,25 | 18,25 | 18,375 | 18,25 | ||
78 | 18,875 | 18,75 | 18,875 | 18,75 | ||
79 | 19,375 | 19,25 | 19,375 | 19,25 | ||
80 | 19,875 | 19,875 | 20 | 20 | ||
81 | 20,5 | 20,375 | 20,5 | 20,5 | ||
82 | 21 | 21 | 21,125 | 21 | ||
83 | 21,625 | 21,5 | 21,625 | 21,5 | ||
84 | 22,125 | 22,125 | 22,25 | 22,25 | ||
85 | 22,75 | 22,625 | 22,75 | 22,75 | ||
86 | 23,375 | 23,25 | 23,375 | 23,25 | ||
87 | 24 | 23,875 | 24 | 24 | ||
88 | 24,5 | 24,5 | 24,625 | 24,5 | ||
89 | 25,125 | 25,125 | 25,25 | 25,25 | ||
90 | 25,75 | 25,75 | 25,875 | 25,75 | ||
91 | 26,375 | 26,375 | 26,5 | 26,5 | ||
92 | 27,125 | 27 | 27,125 | 27 | ||
93 | 27,75 | 27,625 | 27,75 | 27,75 | ||
94 | 28,375 | 28,375 | 28,5 | 28,5 | ||
95 | 29 | 29 | 29,125 | 29 | ||
96 | 29,75 | 29,625 | 29,75 | 29,75 |
97 | 30,375 | 30,375 | 30,5 | 30,5 | ||
98 | 31,125 | 31 | 31,125 | 31 | ||
99 | 31,75 | 31,75 | 31,875 | 31,75 | ||
100 | 32,5 | 32,5 | 32,625 | 32,5 | ||
101 | 33,25 | 33,125 | 33,25 | 33,25 | ||
102 | 34 | 33,875 | 34 | 34 | ||
103 | 34,75 | 34,625 | 34,75 | 34,75 | ||
104 | 35,5 | 35,375 | 35,5 | 35,5 | ||
105 | 36,25 | 36,125 | 36,25 | 36,25 | ||
106 | 37 | 36,875 | 37 | 37 | ||
107 | 37,75 | 37,625 | 37,875 | 37,625 | ||
108 | 38,5 | 38,5 | 38,625 | 38,5 | ||
109 | 39,25 | 39,25 | 39,375 | 39,25 | ||
110 | 40,125 | 40 | 40,125 | 40 | ||
111 | 40,875 | 40,875 | 41 | 41 | ||
112 | 41,75 | 41,625 | 41,75 | 41,75 | ||
113 | 42,5 | 42,5 | 42,625 | 42,5 | ||
114 | 43,375 | 43,25 | 43,5 | 43,5 | ||
115 | 44,25 | 44,125 | 44,25 | 44,25 | ||
116 | 45,125 | 45 | 45,125 | 45 | ||
117 | 45,875 | 45,875 | 46 | 46 | ||
118 | 46,75 | 46,75 | 46,875 | 46,75 | ||
119 | 47,625 | 47,625 | 47,75 | 47,75 | ||
120 | 48,625 | 48,5 | 48,625 | 48,5 | ||
121 | 49,5 | 49,375 | 49,5 | 49,5 | ||
122 | 50,375 | 50,25 | 50,5 | 50,5 | ||
123 | 51,25 | 51,25 | 51,375 | 51,25 | ||
124 | 52,25 | 52,125 | 52,25 | 52,25 | ||
125 | 53,125 | 53 | 53,25 | 53 | ||
126 | 54,125 | 54 | 54,125 | 54 | ||
127 | 55 | 54,875 | 55,125 | 55 | ||
128 | 56 | 55,875 | 56,125 | 56 | ||
129 | 57 | 56,875 | 57 | 57 | ||
130 | 57,875 | 57,875 | 58 | 58 | ||
131 | 58,875 | 58,75 | 59 | 59 | ||
132 | 59,875 | 59,75 | 60 | 60 | ||
133 | 60,875 | 60,75 | 61 | 61 | ||
134 | 61,875 | 61,75 | 62 | 62 | ||
135 | 62,875 | 62,875 | 63 | 63 | ||
136 | 64 | 63,875 | 64,125 | 64 | ||
137 | 65 | 64,875 | 65,125 | 65 | ||
138 | 66 | 66 | 66,125 | 66 | ||
139 | 67,125 | 67 | 67,25 | 67 | ||
140 | 68,125 | 68,125 | 68,25 | 68,25 | ||
141 | 69,25 | 69,125 | 69,375 | 69,25 | ||
142 | 70,375 | 70,25 | 70,5 | 70,5 | ||
143 | 71,375 | 71,375 | 71,5 | 71,5 | ||
144 | 72,5 | 72,375 | 72,625 | 72,5 | ||
145 | 73,625 | 73,5 | 73,75 | 73,5 | ||
146 | 74,75 | 74,625 | 74,875 | 74,75 | ||
147 | 75,875 | 75,75 | 76 | 75,75 | ||
148 | 77 | 76,875 | 77,125 | 77 | ||
149 | 78,25 | 78,125 | 78,25 | 78,25 | ||
150 | 79,375 | 79,25 | 79,5 | 79,5 |
151 | 80,5 | 80,375 | 80,625 | 80,5 | ||
152 | 81,75 | 81,625 | 81,875 | 81,75 | ||
153 | 82,875 | 82,75 | 83 | 83 | ||
154 | 84,125 | 84 | 84,25 | 84 | ||
155 | 85,25 | 85,125 | 85,375 | 85,25 | ||
156 | 86,5 | 86,375 | 86,625 | 86,5 | ||
157 | 87,75 | 87,625 | 87,875 | 87,75 | ||
158 | 89 | 88,875 | 89,125 | 89 | ||
159 | 90,25 | 90,125 | 90,375 | 90,25 | ||
160 | 91,5 | 91,375 | 91,625 | 91,5 | ||
161 | 92,75 | 92,625 | 92,875 | 92,75 | ||
162 | 94 | 93,875 | 94,125 | 94 | ||
163 | 95,25 | 95,125 | 95,375 | 95,25 | ||
164 | 96,5 | 96,375 | 96,75 | 96,5 | ||
165 | 97,875 | 97,75 | 98 | 98 | ||
166 | 99,125 | 99 | 99,25 | 99 | ||
167 | 100,5 | 100,375 | 100,625 | 100,5 | ||
168 | 101,875 | 101,625 | 102 | 102 | ||
169 | 103,125 | 103 | 103,25 | 103 | ||
170 | 104,5 | 104,375 | 104,625 | 104,5 | ||
171 | 105,875 | 105,75 | 106 | 106 | ||
172 | 107,25 | 107,125 | 107,375 | 107,25 | ||
173 | 108,625 | 108,5 | 108,75 | 108,5 | ||
174 | 110 | 109,875 | 110,125 | 110 | ||
175 | 111,375 | 111,25 | 111,5 | 111,5 | ||
176 | 112,75 | 112,625 | 112,875 | 112,75 | ||
177 | 114,25 | 114,125 | 114,375 | 114,25 | ||
178 | 115,625 | 115,5 | 115,75 | 115,5 | ||
179 | 117,125 | 116,875 | 117,25 | 117 | ||
180 | 118,5 | 118,375 | 118,625 | 118,5 | ||
181 | 120 | 119,875 | 120,125 | 120 | ||
182 | 121,375 | 121,25 | 121,625 | 121,5 | ||
183 | 122,875 | 122,75 | 123 | 123 | ||
184 | 124,375 | 124,25 | 124,5 | 124,5 | ||
185 | 125,875 | 125,75 | 126 | 126 | ||
186 | 127,375 | 127,25 | 127,5 | 127,5 | ||
187 | 128,875 | 128,75 | 129 | 129 | ||
188 | 130,375 | 130,25 | 130,5 | 130,5 | ||
189 | 131,875 | 131,75 | 132,125 | 132 | ||
190 | 133,5 | 133,375 | 133,625 | 133,5 | ||
191 | 135 | 134,875 | 135,125 | 135 | ||
192 | 136,625 | 136,375 | 136,75 | 136,5 | ||
193 | 138,125 | 138 | 138,375 | 138 | ||
194 | 139,75 | 139,625 | 139,875 | 139,75 | ||
195 | 141,375 | 141,125 | 141,5 | 141,25 | ||
196 | 142,875 | 142,75 | 143,125 | 143 | ||
197 | 144,5 | 144,375 | 144,75 | 144,5 | ||
198 | 146,125 | 146 | 146,375 | 146 | ||
199 | 147,75 | 147,625 | 148 | 148 | ||
200 | 149,375 | 149,25 | 149,625 | 149,5 | ||
201 | 151,125 | 150,875 | 151,25 | 151 | ||
202 | 152,75 | 152,625 | 152,875 | 152,75 | ||
203 | 154,375 | 154,25 | 154,625 | 154,5 | ||
204 | 156,125 | 155,875 | 156,25 | 156 |
205 | 157,75 | 157,625 | 157,875 | 157,75 | ||
206 | 159,5 | 159,25 | 159,625 | 159,5 | ||
207 | 161,125 | 161 | 161,375 | 161 | ||
208 | 162,875 | 162,75 | 163 | 163 | ||
209 | 164,625 | 164,5 | 164,75 | 164,5 | ||
210 | 166,375 | 166,125 | 166,5 | 166,5 | ||
211 | 168,125 | 167,875 | 168,25 | 168 | ||
212 | 169,875 | 169,625 | 170 | 170 | ||
213 | 171,625 | 171,5 | 171,75 | 171,5 | ||
214 | 173,375 | 173,25 | 173,625 | 173,5 | ||
215 | 175,25 | 175 | 175,375 | 175 | ||
216 | 177 | 176,75 | 177,125 | 177 | ||
217 | 178,75 | 178,625 | 179 | 179 | ||
218 | 180,625 | 180,375 | 180,75 | 180,5 | ||
219 | 182,5 | 182,25 | 182,625 | 182,5 | ||
220 | 184,25 | 184,125 | 184,5 | 184,5 | ||
221 | 186,125 | 186 | 186,375 | 186 | ||
222 | 188 | 187,75 | 188,125 | 188 | ||
223 | 189,875 | 189,625 | 190 | 190 | ||
224 | 191,75 | 191,5 | 191,875 | 191,5 | ||
225 | 193,625 | 193,375 | 193,75 | 193,5 | ||
226 | 195,5 | 195,375 | 195,75 | 195,5 | ||
227 | 197,375 | 197,25 | 197,625 | 197,5 | ||
228 | 199,375 | 199,125 | 199,5 | 199,5 | ||
229 | 201,25 | 201,125 | 201,5 | 201,5 | ||
230 | 203,25 | 203 | 203,375 | 203 | ||
231 | 205,125 | 205 | 205,375 | 205 | ||
232 | 207,125 | 206,875 | 207,375 | 207 | ||
233 | 209,125 | 208,875 | 209,25 | 209 | ||
234 | 211,125 | 210,875 | 211,25 | 211 | ||
235 | 213 | 212,875 | 213,25 | 213 | ||
236 | 215 | 214,875 | 215,25 | 215 | ||
237 | 217,125 | 216,875 | 217,25 | 217 | ||
238 | 219,125 | 218,875 | 219,25 | 219 | ||
239 | 221,125 | 220,875 | 221,375 | 221 | ||
240 | 223,125 | 223 | 223,375 | 223 | ||
241 | 225,25 | 225 | 225,375 | 225 | ||
242 | 227,25 | 227,125 | 227,5 | 227,5 | ||
243 | 229,375 | 229,125 | 229,5 | 229,5 | ||
244 | 231,375 | 231,25 | 231,625 | 231,5 | ||
245 | 233,5 | 233,25 | 233,75 | 233,5 | ||
246 | 235,625 | 235,375 | 235,875 | 235,5 | ||
247 | 237,75 | 237,5 | 238 | 237,5 | ||
248 | 239,875 | 239,625 | 240,125 | 240 | ||
249 | 242 | 241,75 | 242,25 | 242 | ||
250 | 244,125 | 243,875 | 244,375 | 244 | ||
251 | 246,25 | 246,125 | 246,5 | 246,5 | ||
252 | 248,5 | 248,25 | 248,625 | 248,5 | ||
253 | 250,625 | 250,375 | 250,875 | 250,5 | ||
254 | 252,75 | 252,625 | 253 | 253 | ||
255 | 255 | 254,75 | 255,25 | 255 |
Claims (10)
1、一种用于处理视频数据的方法,其通过将转移函数施加于所述视频数据、将抖动施加于所述转移函数来处理视频数据,其特征在于为了将所述抖动施加于转移函数,其包括下面步骤:
(S1)将第一输出值和第二输出值与所述转移函数的离散输入值相关联;
(S2)选择等于和/或在所述第一输出值和所述第二输出值之间、使用最少数量的抖动比特的中间值;和
(S3)将所述中间值用作所述离散输入值的输出值。
2、根据权利要求1所述的方法,其中所述转移函数是去伽玛函数。
3、根据权利要求1或2所述的方法,其中通过查询表来提供所述转移函数。
4、根据前面权利要求之一的方法,其中通过修改转移函数的参数来计算所述第一和第二输出值。
5、根据权利要求4所述的方法,其中通过对所述参数加减修改值来修改所述参数,并且通过所述修改的参数而获得所述第一和第二输出值。
6、根据前面权利要求之一的方法,其中,如果存在带有相同最少数量的所用抖动比特的多个中间值,则选择较接近所述离散函数值的值作为中间值。
7、一种用于处理视频数据设备,该设备具有:
处理装置(1),用于将转移函数施加于所述视频数据;和
抖动装置(2),用于将抖动施加于所述转移函数;
其特征在于:
所述抖动装置(2)将第一输出值和第二输出值与所述转移函数的离散输入值相关联,选择等于和/或在所述第一输出值和所述第二输出值之间、使用最少数量的抖动比特的中间值,而且将所述中间值用作所述离散输入值的输出值。
8、根据权利要求7所述的设备,其中所述转移函数是去伽玛函数。
9、根据权利要求7或8所述的设备,其具有用于在查询表中提供所述转移函数的存储装置。
10、根据权利要求7到9之一的设备,其中所述抖动装置(2)适于通过修改转移函数的参数来计算所述第一和所述第二输出值。
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EP04292087.6 | 2004-08-25 | ||
EP04292087A EP1630772A1 (en) | 2004-08-25 | 2004-08-25 | Method and device for dithering |
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US (1) | US20060044325A1 (zh) |
EP (1) | EP1630772A1 (zh) |
JP (1) | JP2006065329A (zh) |
KR (1) | KR20060050616A (zh) |
CN (1) | CN1741108A (zh) |
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TW (1) | TW200608771A (zh) |
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US8339428B2 (en) * | 2005-06-16 | 2012-12-25 | Omnivision Technologies, Inc. | Asynchronous display driving scheme and display |
US8223179B2 (en) * | 2007-07-27 | 2012-07-17 | Omnivision Technologies, Inc. | Display device and driving method based on the number of pixel rows in the display |
US8228350B2 (en) * | 2008-06-06 | 2012-07-24 | Omnivision Technologies, Inc. | Data dependent drive scheme and display |
US9024964B2 (en) * | 2008-06-06 | 2015-05-05 | Omnivision Technologies, Inc. | System and method for dithering video data |
US8228349B2 (en) * | 2008-06-06 | 2012-07-24 | Omnivision Technologies, Inc. | Data dependent drive scheme and display |
US11637964B2 (en) * | 2021-01-14 | 2023-04-25 | Canon Kabushiki Kaisha | Image processing apparatus, image display system, image processing method having a time dithering process |
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JP2000023181A (ja) * | 1998-07-03 | 2000-01-21 | Hitachi Ltd | カラー映像信号の表示装置 |
EP1136974A1 (en) * | 2000-03-22 | 2001-09-26 | Deutsche Thomson-Brandt Gmbh | Method for processing video data for a display device |
KR100491942B1 (ko) * | 2000-10-03 | 2005-05-30 | 세이코 엡슨 가부시키가이샤 | 화상 처리 방법 및 화상 처리 장치 |
US6909435B2 (en) * | 2000-12-20 | 2005-06-21 | Thomson Licensing S.A. | Reduction of gamma correction contouring in liquid crystal on silicon (LCOS) displays |
EP1256924B1 (en) * | 2001-05-08 | 2013-09-25 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for processing video pictures |
EP1262942A1 (en) * | 2001-06-01 | 2002-12-04 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for processing video data for a display device |
EP1353314A1 (en) * | 2002-04-11 | 2003-10-15 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for processing video pictures to improve the greyscale resolution of a display device |
-
2004
- 2004-08-25 EP EP04292087A patent/EP1630772A1/en not_active Withdrawn
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2005
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- 2005-08-18 JP JP2005237591A patent/JP2006065329A/ja not_active Withdrawn
- 2005-08-23 MX MXPA05008945A patent/MXPA05008945A/es not_active Application Discontinuation
- 2005-08-24 KR KR1020050077845A patent/KR20060050616A/ko not_active Application Discontinuation
- 2005-08-24 CN CNA2005100977402A patent/CN1741108A/zh active Pending
- 2005-08-24 US US11/211,120 patent/US20060044325A1/en not_active Abandoned
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TW200608771A (en) | 2006-03-01 |
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JP2006065329A (ja) | 2006-03-09 |
MXPA05008945A (es) | 2006-03-28 |
EP1630772A1 (en) | 2006-03-01 |
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