CN100545892C - Method and apparatus for generating a look-up table in the video picture field - Google Patents

Method and apparatus for generating a look-up table in the video picture field Download PDF

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CN100545892C
CN100545892C CN 200480038029 CN200480038029A CN100545892C CN 100545892 C CN100545892 C CN 100545892C CN 200480038029 CN200480038029 CN 200480038029 CN 200480038029 A CN200480038029 A CN 200480038029A CN 100545892 C CN100545892 C CN 100545892C
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subset
lookup table
table
val
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CN1898715A (en )
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卡洛斯·科雷亚
塞巴斯蒂安·韦特布鲁克
锡德里克·西鲍尔特
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汤姆森特许公司
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Abstract

本发明在等离子体显示板(PDP)或其他每个视频电平用根据特定编码的位的组合来表示的显示设备领域中特别有用。 The present invention is a display panel (PDP) or other video level for each field of display apparatus in accordance with a combination of bits to represent particular coding is particularly useful in the plasma. 在这种情况下,当用于改善图像质量的算法是基于诸如查找表(LUT)等存储在存储器中的数据时,这些表的大小可能很大。 In this case, when the algorithms used to improve picture quality are based on data (LUT) stored in a memory and the like, such as a look-up table, the size of these tables can be large. 为了改善PDP中的图像质量,开发了使用元代码LUT的算法,使用存储在查找表中的数据。 In order to improve the image quality of the PDP, the developed algorithm uses the LUT element code, using the data stored in the lookup table. 本发明提出降低实现元代码所需的查找表量的方法。 The present invention proposes a method to reduce the amount of required lookup table element code. 根据本发明,只存储一些大小较小的查找表,而通过外插法实现其他查找表。 According to the present invention, only a smaller storage size of some of the look-up table, and by extrapolation other implement lookup table.

Description

生成视频图像场中的查找表的方法和装置 Method and apparatus for generating a video image field of the look-up table

本发明涉及生成视频图像场中的查找表的方法。 The present invention relates to a method of generating a video image field lookup table. 它还涉及实现所述方法的电路。 It also relates to a circuit implementing the method.

位的组合来表示的显示设备领域中特别有用。 Field of the display device represented by a combination of bits to be particularly useful. 在这种情况下,当用于改善图 In this case, when for improving FIG.

像质量的算法是基于诸如查找表(LUT)等存储在存储器中的数据时,这些表的大小可能很大。 The algorithm is based on image quality when data such as lookup table (LUT) stored in a memory and the like, the size of these tables can be large.

技术领域 FIELD

为了理解这个问题,将结合PDP描述本发明,但本发明可以应用到其他类型的显示器或其他处理视频数据并要求大量存储器的装置。 To understand this problem, the present invention will be described in conjunction with PDP, but the present invention can be applied to other types of display or other video data processing apparatus and a large amount of memory required.

为了改善PDP的图像质量,开发了许多种使用存储在查找表中的数据的算法。 In order to improve the image quality of the PDP, the algorithm developed in the lookup table data using a wide variety of storage. 例如,在EP专利申请1353314中描述了一种基于对每帧中出现的每个平均功率电平(APL)修改编码方式来改善灰度级逼真表现(fidelity portrayal)的方法。 For example, in Patent Application EP 1,353,314 describes a coding scheme based on a modification of each average power level (APL) in each frame appears to improve the performance of realistic gradation (fidelity portrayal) method. 它基于元代码(Metacode)的概念,其中用基于子场实际亮度的元代码替代基于子场加权的子场代码。 It is based on the concept element code (Metacode), wherein the subfield with the actual luminance alternative element code subfield weighted subfield codes. 更具体地说,对于给定的峰值白色电平,维持脉冲在子场当中分布, 一个子场中的脉冲数量对应于其加权。 More specifically, for a given peak white level subfield sustain pulse distribution in which the number of pulses in a subfield corresponding to its weighting. 然后,子场代码被映射到亮度代码,后者以明确的顺序重新排序。 Then, the sub-field code is mapped to luminance codes, the latter in a clear re-ordered. 此外,将视频电平映射到可用的亮度代码,并进行处理以实现中间的亮度级。 Further, the video level is mapped to the available luminance codes, and processed to achieve an intermediate level of luminance. 然后,将亮度代码映射到输出的子场代码。 Then, the luminance codes to subfield codes mapped output. 在这种情况下,至少使用查找表将视频电平映射到亮度代码并且将亮度代码映射到输出子场代码。 In this case, at least lookup table maps the code to the luminance level of the video and map the output code to the brightness subfield codes. 这些包含有例如要为每个新APL值加载的亮度代码的查找表存储在外部存储器中。 These comprise for example a lookup table stored in the luminance code to be loaded for each new APL value in the external memory. 这些称为元代码查找表的表非常大。 These tables are called element code look-up table is very large.

图1是EP专利申请1353314中描述的元代码编码单元的标准实现电路。 FIG 1 is a standard element code encoding unit described in EP patent application 1353314 circuit implementation. 该单元包括具有1024 x 12位的第一存储器100,用于处理10位的输入^L频分辨率。 The unit includes a first memory 100 1024 x 12-bit, 10-bit input for processing the frequency resolution ^ L. 第一元代码查找表存储在该存储器中,并且用于将视频电平映射到可用的亮度代码。 The first element code look-up table stored in the memory, and for mapping video levels to luminance codes available. 它可以包括或不包括去伽马(degamma)功能。 It may or may not include degamma (Degamma) function. 每次APL值改变时将新的元代码查找表加载到存储器100中。 Each time a new lookup table element code is loaded into the memory 100 when the APL value changes. 在存储器100的输出端得到12位的视频信号。 12 obtained at the output of the memory 100 of the video signal. 可用的12位对应于8位整数分辨率和4位小数分辨率。 12 available for 8-bit resolution and four decimal integer resolution. 然后,12位的视频信号YA[ll-O]被传送到抖动电路110。 Then, 12-bit video signal YA [ll-O] is transmitted to the dither circuit 110. 在该电路110中, 将4位的小数分辨率与4位的抖动相加,然后截断。 In this circuit 110, the four fractional resolution are added with the 4-bit dithering, and then cut off.

然后,来自电路110的视频信号YB[7,0]被传送到具有256 x 16位的第二存储器120。 Then, the video signal from the circuit 110 YB [7,0] is transferred to 256 x 16-bit having a second memory 120. 第二查找表存储在存储器120中,并且用于实现将亮度代码映射到输出子场代码的代码转换步骤。 Second lookup table stored in memory 120 and used to implement the mapping luminance codes to subfield code conversion step of outputting the code.

如前面提到的,每次APL值改变时,需要用新的元代码查找表更新存储器IOO。 As mentioned above, each time the APL value changes, the need to update the lookup table with the new memory element code IOO. 为每个APL值提供查找表。 APL provides lookup tables for each value. 这些查找表存储在外部存储器130中, 例如FLASH存储器、EEPROM等。 These look-up tables stored in the external memory 130, such as FLASH memory, EEPROM, etc.. 元代码查找表对每个视频电平和给定的APL值定义12位代码,表示要为实现视频电平而生成的亮度代码。 Element code look-up table for each video level and a given APL value defines the code 12, is said to achieve a video luminance level generated code. 在10位APL值的情况下,需要大小为1024 x 1024 x 1242Mbit的外部存储器。 In a case where the APL value of 10, need size 1024 x 1024 x 1242Mbit external memory.

此外,如果对每种色彩需要不同的元代码查找表,则存储器130的总大小增加到36Mbit。 Further, if a different color for each element code of the lookup table, the total size of the memory 130 is increased to 36Mbit. 此外,由于元代码查找表对于等离子体显示板中使用的每种显示模式(例如,60Hz, 50Hz, 75Hz…)是不同的,因此外部存储器需要进一步增加:对于3种模式是108Mbit。 Further, since the element code look-up table for each of the plasma display panel used in a display mode (e.g., 60Hz, 50Hz, 75Hz ...) it is different, and therefore need to further increase the external memory: for the three modes is 108Mbit.

因此,图1的实现电路中的一个主要问题是外部存储器130的大小较大。 Thus, a major problem to realize the circuit of FIG. 1 is the size of the external memory 130 is large.

本发明的目的是提出一种通过使用少量元代码查找表以及通过外插其他元代码查找表、来减少实现所述元代码方法所需的数据量的方法。 Object of the present invention is to propose a small number of element codes by using a lookup table, and by extrapolation other element code lookup table, to reduce the amount of data required to implement the methods element code.

总体来说,本发明涉及对N个不同值当中的给定的参数值生成查找表的方法,查找表的输出值可以通过取决于给定值的变量(S(VAL))的分段线性函数来近似。 Overall, the present invention relates to a method for the given parameter values ​​among the N different values ​​to generate the lookup table, the lookup table output value can be variable depending on a given value (S (VAL)) of the piecewise linear function approximated.

它也可以用于生成视频图像场中的其他查找表。 It can also be used to generate other lookup tables video image field. 发明内容 SUMMARY

因此,本发明提出一种对N个不同值中参数的给定值生成查找表的设备, 查找表的输出值可以通过取决于该给定值的变量的分段线性函数来近似,N 个值的集合被分成P个连续值的子集合,所述分段线性函数的每段位于不同的子集合中,特征在于,该设备包括: Accordingly, the present invention proposes a different N values ​​for a given parameter value generating apparatus lookup table, the lookup table output value can be approximated by a piecewise linear function of a variable depending on the given value, the value of N the set being divided into P subsets of consecutive values ​​of one, each piece of the piecewise linear function is in a different subset, characterized in that, the apparatus comprising:

第一存储器,用于对每个子集合i存储与该子集合i的最高边界值相关的主查找表,第二存储器,用于对每个子集合i存储与关于该子集合i的辅查找表和主查找表之间的差相对应的增量查找表,辅查找表与子集合i的最低边界值对应地相关, A first memory for each subset i lookup table stored in association with the highest value of the boundary of the main subset i, a second memory, for each subset i and the secondary lookup table stored on the subset i and primary lookup table corresponding to the difference between the incremental lookup table, the secondary lookup table and the lowest limit value of i corresponding to the relevant subset,

第三存储器,用于对所述N个值中的每一个存储索引,该索引指示需要使用第一存储器中的哪个主查找表和第二存储器中的哪个增量查找表进行外插, A third memory for storing an index for each of said N values, an index indicating the first main memory which requires the use of a look-up table and a second memory which delta look-up table extrapolation

第四存储器,用于对所述N个值中的每一个存储外插系数,与给定值相关的外插系数是根据对于所述给定值的变量S的值和对于包括所述给定值的子集合i的两个边界值的变量S的值定义的;和 Fourth memory, for storing each of said N extrapolation coefficient values, extrapolation coefficients given value is a value associated with the variable S for the given value and comprising for said given the value of variable S defined by two boundary values ​​of the subset of value i; and

计算模块,用于根据相关的外插系数、主查找表和增量查找表,对给定值生成查找表, Calculation module, according to the relevant extrapolation coefficients, delta primary lookup table and the lookup table for a given value generating lookup tables,

其中,参数是平均功率电平,变量S的值是对应于参数的给定值的维持脉冲数量。 Wherein the parameter is the average power level, the value of the variable S is the number of sustain pulses corresponding to a given value of parameter.

在这里所述的实施例中,生成的查找表是元代码查找表,参数是平均功率电平,并且变量是对应于参数的给定值的维持脉冲数量。 In the embodiment described herein, the generated look-up table element code is a lookup table, the parameter is the average power level, and a variable number of sustain pulses corresponding to a given value of parameter.

与平均功率电平值的子集合的主查找表有关的边界电平是该子集合的最 Subset of the average power level value of the primary lookup table relating to border level is a subset of the most

高平均功率电平值,而与平均功率电平值的子集合的辅查找表有关的边界电 High average power level value, and a subset of the value of the average power level of the secondary lookup table border electricity-related

平是该子集合的最低平均功率电平值。 Ping is the lowest average power level value of the subset.

最好,对于子集合i中的一个边界值的变量值与对于子集合i+l中的同 Preferably, the limit value for a variable value in the subset i and i + l with respect to a subset of

一边界值的变量值之间的比率等于固定参数a。 The ratio between the boundary value of a variable equal to the fixed value of the parameter a. 参数a定义如下:a = ?|^, A parameter is defined as follows: a = | ^,?

V s國 V s country

其中Smax是峰植白色图像的变量S的值,而Smjn是全白色图像的变量S的值。 Wherein the value of the variable S is Smax peak plant white image, while the value of the variable is Smjn all-white image of S. 外插系数等于C(狐卜^=:pMMTg),其中,S(PMTCi)是对于子集 Extrapolation coefficient is equal to C (Fox Bu ^ =: pMMTg), wherein, S (PMTCi) for the sub-set

合i的最高边界值的变量S的值;S(SMTCi)是对于子集合i的最低边界值的变量S的值;而S(VAL)是对于给定值的变量值。 The maximum value of the variable S i of the laminated boundary value; S (SMTCi) for the lowest limit value of the variable S i a subset of values; and S (VAL) for a given variable value.

计算出的查找表等于对于给定值VAL的主查找表PMTQ的输出与经过 Calculated lookup table is equal to the lookup table to the main PMTQ output value VAL elapsed

给定值VAL的外插系数加权的、对于给定值VAL的增量查找表PMTCi的输 Given value VAL extrapolation weighting coefficients, look for a delta value VAL of the input table PMTCi

出之和。 A sum.

附图说明 BRIEF DESCRIPTION

在附图中示出本发明的示例性实施例,并且在下面的描述中进行详细说明。 Shown in the drawings an exemplary embodiment of the present invention and described in detail in the following description. 附图中:图l是示出现有技术方法的实现的示意图;和 In the drawings: Figure l is a schematic diagram of a method for realizing illustrating techniques; and

图2是示出根据本发明的方法的可能实现的示意图。 FIG 2 is a diagram illustrating possible implementation of the method according to the invention.

具体实施方式 detailed description

将参照对于不同平均功率电平或APL值生成元代码查找表来描述本发明。 The different average power level APL value generating element code or lookup table will be described with reference to the present invention.

本发明的目标是减少需要的查找表数量。 Object of the present invention to reduce the number of required lookup tables. 将仅仅对一些APL值预定义一些查找表,而对其他APL值,将从这些预定义的查找表外插新的查找表。 The only some of the APL value predefined number of look-up tables, and other APL value, extrapolation from these new lookup table of pre-defined look-up table.

在下面的说明书中,对给定APL值定义的元代码LUT为每个输入视频电平定义表示要使用的亮度代码的输出电平。 In the following description, the definition of each input video level represents an output level of the luminance code to be used for a given APL value for the LUT elements defined codes.

根据本发明,如图2所示,使用总大小低于图1的存储器130的大小的4个查找表以及估计模块来对所有APL值实现元代码查找表: According to the invention, shown in Figure 2, using four lookup tables, and the total size is less than the estimated size of the memory module 130 of Figure 1 to achieve the element code lookup tables for all APL values:

第一查找表LUTl,它包括自身的16个元代码LUT(称为主元代码LUT); 每个主元代码LUT包括关于特定APL值(称为主APL值)的元代码;将在下面的说明书中描述主APL值; First lookup table LUTl, which itself comprises a 16 element code LUT (LUT called main element code); each LUT comprises a main element code element code about a specific APL value (referred to as primary APL value); and in the following primary APL value described in the specification;

第二查找表LUT2,它包括16个增量LUT,增量LUT对应于辅元代码LUT和所述主元代码LUT之间的差;每个辅元代码LUT包括关于特定APL 值(称为辅APL值)的元代码;将在下面的说明书中描述辅APL值; Second lookup table LUT2, comprising a delta LUT 16, delta LUT corresponding to the difference between the secondary and the primary element code element codes LUT LUT; LUT codes each secondary element comprises on a specific APL value (referred to as secondary APL value) of the element code; secondary APL values ​​will be described in the following specification;

第三查找表LUT3,它包括对于每个APL值的索引,索引指示需要使用LUTl中的哪个主元代码LUT和LUT2中的哪个增量LUT来进行外插。 Third lookup table LUT3, comprising indicating, for each APL value of the index, which requires the use of delta LUT LUTl in which the main element code to LUT and LUT2 are extrapolated.

第四查找表LUT4,它包括对于每个APL值将要用于外插的系数,和 A fourth look-up table LUT 4, which comprises, for each APL value to be used for extrapolation coefficients, and

外插模块EXTRAPOL,用于计算LUT。 Extrapolation module EXTRAPOL, for calculating the LUT.

如上所述,每个APL值的子集合包括主APL值和辅APL值。 As described above, the APL value of each subset comprises a primary and a secondary APL value APL value. APL值的集合包括例如从0到1023的1024个值,并且例如被分成16个连续的APL 值的子集合。 APL values ​​comprises a set of 1024 values, for example, from 0 to 1023, and for example, is divided into 16 contiguous subset of APL values. 主APL值是子集合的最高APL值(对应于最小数量的维持脉冲), 而辅APL值是子集合的最低APL值(对应于最高数量的维持脉冲)。 Primary APL value is a subset of the highest APL value (corresponding to the smallest number of sustain pulses), and the secondary APL value of the lowest APL value is a subset (corresponding to the maximum number of sustain pulses). 对每个主APL值定义主元代码LUT。 Main element code is defined for each primary APL value LUT. 这些主元代码LUT存储在LUTl中。 The LUT is stored in the main element code in LUTl. 对每个辅APL值定义辅元代码LUT,但这些辅元代码LUT不存储在LUTl或LUT2 中。 APL value is defined for each secondary LUT secondary element code, but the auxiliary element code is not stored in the LUT in LUTl or LUT2. 它们仅仅用来计算存储在LUT2中的增量LUT。 They are only used to calculate the delta LUT stored in the LUT2.

查找表LUT3为每个APL值提供生成该APL值的元代码LUT需要使用的主元代码LUT上的指针。 Lookup table LUT3 provides a pointer on the primary LUT generation element code value of the element code APL need to use LUT for each APL value. LUT3具有10位的输入和4位的输出,用于选择16个主元代码LUT之一。 LUT3 having an input and four outputs 10 for selecting one of the code primary LUT 16 th element.

在说明书中使用的符号如下: Symbols used in the specification are as follows:

PMTCi表示关于APL值的子集合i的主元代码LUT, S(PMTCj)表示对于对应于主元代码LUT PMTCi的APL值(主APL值)的 PMTCi LUT on a front element code subset i of APL values, S (PMTCj) represents the main element code corresponding to the LUT PMTCi value of the APL (primary APL value)

维持脉冲数量; Number of sustain pulses;

PMTCi(V)表示对于视频电平V,主元代码LUT PMTCi的输出; SMTCi表示关于APL值的子集合i的辅元代码LUT, S(SMTQ)表示对于对应于辅元代码LUT SMTCi的APL值的维持脉冲数 PMTCi (V) to the video level represented by V, the main element code output LUT PMTCi; SMTCi secondary metacode LUT represents about subset i of APL values, S (SMTQ) represents the secondary APL value for the element code corresponding to the LUT SMTCi the number of sustain pulses

SMTCi(V)表示对于视频电平V,辅元代码LUT SMTCi的输出;和S(X)表示对于APL值X,维持脉冲的数量。 SMTCi (V) to the video level represented by V, the secondary metacode LUT SMTCi output; and S (X) represents the APL value for X, the number of sustain pulses.

当从一个主元代码LUT切换到另一个时可能出现一些跳跃。 When switching from one primary metacode LUT to another may be some jump. 例如,最小的子场代码值(例如,1个维持脉冲)具有不同的相对值(其等于1/维持脉冲总量),这是由于维持脉冲的总量从一个主元代码电平改变到另一个(从一个APL 值到另一个)。 For example, the smallest sub-field code value (e.g., a sustain pulse) have different relative values ​​(which is equal to 1 / total sustain pulse), which is due to the total amount of sustain pulses changes from a master to the other element code level a (APL values ​​from one to another). 这两个不同的值之比(其等于两个主元代码LUT的两个不同的维持脉沖总量之比)会产生跳跃。 These two different values ​​of the ratio (which is equal to the ratio of the total amount of the two different sustain pulses of two main element code LUT) is generated jump.

为了当从一个主元代码切换到另一个时具有几乎相同的可能跳跃的可视 Having almost the same for another possible jumps when switching from a visual code to the PCA

性,这些比率应当如下相等: Resistance, these ratios should be equal to the following:

S(PMTC。) S(PMTC》 S(PMTCi) S(PMTC14) S (PMTC.) S (PMTC "S (PMTCi) S (PMTC14)

a a

S(PMTC》 S(PMTC2) S(PMTCi+1) S(PMTC15/ S (PMTC "S (PMTC2) S (PMTCi + 1) S (PMTC15 /

这意味着以对数方式进行划分。 This means that the divided logarithmically. 前面的等式意味着APL值的第2、第3 、... It means the foregoing Equation 2, the value of 3 APL, ...

和第15个子集合在它们最小的APL值和它们的最高值的维持脉冲数量之间 And a second sub-set 15 between their minimum number of sustain pulses APL value and the highest value thereof

的比率相同。 The same ratio. 如果该比率a也施加到第一子集,那么我们有S隨—S(PMTCJ- — S(PMTCj) _ —S(PMTC14) If this ratio is also applied to a first subset, then we have S with -S (PMTCJ- - S (PMTCj) _ -S (PMTC14)

a = a =

S(PMTC。) S(PMTCJ S(PMTCi+l) S(PMTC15) S (PMTC.) S (PMTCJ S (PMTCi + l) S (PMTC15)

其中SMAX是对于峰值白色(低APL值)的维持脉冲数量当将所有项乘在一起时,我们得到: Where SMAX is the number of sustain pulses for peak white (low APL value) when multiplied together will all the time, we obtain:

al6 = 。 al6 =. ,nt 、=》其中S國是对于全白色图像的维持脉冲数量。 , Nt, = "country where S is the number of sustain pulses for a full white image. S(PMTC15) S闘 S (PMTC15) S Dou

所以,a = ^|^2L且s(PMTCj) = S國x a15-。 Therefore, a = ^ | ^ 2L and s (PMTCj) = S States x a15-.

以对数方式进行划分仅仅是个建议,为的是当从一个主元代码LUT切换到另一个时具有相同的可能跳跃的可视性;但可以使用不同的APL集合划分。 Logarithmically dividing merely a suggestion, that is when switching from one primary metacode LUT to another having the same visibility of possible jumps; APL may be used a different set partitioning. 例如,可以使用不同的划分以便具有较多用于低APL值的子集合,较少用于 For example, different subsets divided so as to have more of a low APL value, for less

高APL值的子集合。 APL subset of high value.

在下面附录中给出的例子中,APL值的集合被划分成16个子集合。 Examples given in the Appendix below, the set value of the APL is divided into 16 sub-set. 主APL值(每个子集合的最低APL值)用粗体符号标记,而辅APL值(每个子集合的最高APL值)用黑色区域标记。 Primary APL value (lowest APL value of each subset) bold symbol mark, and the secondary APL value (highest APL value of each subset) are marked with a black area.

对于下面的输入l会出该例子: For the following example, the input will be a l:

峰值白色图像:1100个维持脉沖 Peak white image: 1100 sustain pulses

全白色图像:200个维持脉冲 All-white image: 200 sustain pulses

参数a等于: A parameter is equal to:

按照附录表中所示,确定用于主元代码LUT的16个主APL值。 As shown in Table of Appendix, 16 for determining the main element code primary APL value of the LUT. 主元代码LUT PMTCi的维持脉冲最大数量是200 xcc'1个维持脉冲,i=0... 15。 The maximum number of sustain pulses LUT PMTCi main element code is 200 xcc'1 sustain pulses, i = 0 ... 15. APL值分布如下: APL value is distributed as follows:

从136到 230 的APL值 ~>子集合14 From the value of the APL 136-230 ~> subset 14

从231到 318 的APL值 +子集合13 From 231 to 318 the APL value + subset 13

从319到 398 的APL值 ">子集合12 APL values ​​from 319 to 398 of "> subset 12

从399到 473 的APL值 ^子集合11 From the value of APL 399 to 473 ^ subset 11

从474到 540 的APL值 ^子集合10 From the value of APL 474 to 540 ^ subset 10

从541到 604 的APL值 ">子集合9 APL values ​​from 541 to 604 of "> subset 9

从605到 663 的APL值 ^子集合8 APL values ​​from 605 to 663 ^ subset of 8

从664到 716 的APL值 今子集合7 APL values ​​from 664 to 716 of this subset 7

从717到 766 的APL值 今子集合6 APL values ​​from 717 to 766 of this subset 6

从767到 812 的APL值 "^子集合5 From the value of the APL "767-812 subset of ^ 5

从813到 856 的APL值 ->子集合4 From the value of the APL 813-856 -> subset 4

从857到 898 的APL值 "^子集合3 From 857 to 898 the APL value "subset ^ 3

从899到 938 的APL值 ^子集合2 From 899 to 938 the subset of APL value 2 ^

从939到 978 的APL值 ~>子集合1 From the value of the APL 939-978 ~> subset 1

从979到 1023的APL值 ^子集合0 From the value of APL 979 through 1023 ^ subset 0

例如,对于子集合15,主APL值是135,而辅APL值是O。 For example, for subset 15, the primary APL value is 135, and the secondary APL value is O. 对于主元代 For the main Yuan

从O到135的APL值 APL values ​​from 135 to O

->子集合15码LUT的维持脉冲的最大数量是988,而对于辅元代码LUT是1100。 -> The maximum number of sustain pulses of subset LUT 15 yards is 988, while for the secondary metacode LUT 1100. 通过外插计算与子集合15的i和134之间包含的APL值有关的的元代码LUT。 Calculating by extrapolation of subset i 15 comprising between 134 and APL value of the element code associated LUT. 就它不是与不同的子集合有关的两个元代码LUT之间的内插这一意义而言, It is not just between the inside associated with different subsets of two yuan LUT codes inserted in that sense,

有关的主元代码LUT和与APL值0有关的辅元代码LUT之间的内插来实现。 For interpolation between the main element code associated with the LUT and the secondary APL value 0 metacode LUT to achieve. 辅元代码LUT仅仅用于外插。 LUT secondary element code only for extrapolation. 在优选实施例中,在主元代码LUT PMTCi与对应于主元代码LUT PMTCi和辅元代码LUT SMTC;之间的差的增量LUT之间,进行对子集合i的APL值的外插。 In a preferred embodiment, the primary LUT PMTCi element code corresponding to the primary and secondary metacode LUT PMTCi metacode LUT SMTC; between the difference between the delta LUT, extrapolation APL value of the subset i. 该差LUT(标为LUT2i)存储在查找表LUT2中。 The difference LUT (labeled LUT2i) are stored in a lookup table LUT2. 该LUT2中包含的增量LUT中的值可以为正或负,但8位分辨率就足够了。 Delta LUT value included in the LUT2 may be positive or negative, but the 8-bit resolution is sufficient.

LUT2中与子集合i有关的增量LUT中存储的、对视频电平V预先计算的值为: Delta LUT2 stored in the LUT with related subset i, the video level V previously calculated values:

<formula>formula see original document page 10</formula>最好,为了估计查找表LUT2,应当对PMTCi(V)和SMTCi(V)使用比LUT1 可用分辨率更多的分辨率。 <Formula> formula see original document page 10 </ formula> Preferably, in order to estimate the lookup table LUT 2, should be used more resolution than the resolution of the available LUT1 PMTCi (V) and SMTCi (V).

对属于子集合i的APL值的用于外插的外插系数表示为C(APL),它是当前APL的维持脉冲数量NbSustain(APL)和S(PMTCi)之间的差与S(SMTCi)和S(PMTCi)之间的差的比率。 Of extrapolation coefficients belonging to the subset i of APL value for the extrapolation is represented by C (APL), which is between the APL of the current number of sustain pulses NbSustain (APL) and S (PMTCi) and the difference S (SMTCi) and the ratio of the difference between S (PMTCi). 对于该系数,6位分辨率就足够了。 For the coefficient, 6 resolution is sufficient.

<formula>formula see original document page 10</formula> <Formula> formula see original document page 10 </ formula>

最终外插是:<formula>formula see original document page 10</formula> The final extrapolation is: <formula> formula see original document page 10 </ formula>

主元代码LUT独立于本发明的原理。 LUT main element code is independent of the principles of the present invention. 仅仅从这些主元代码LUT实现吝他元代码LUT。 LUT realize he just stingy LUT from these main element code element code.

如下面所示的图2说明了本发明方法的可能实现。 As shown below in FIG. 2 illustrates a possible implementation of the method according to the present invention. 查找表LUT1、 LUT2、 LUT3和LUT4存储在4个存储器101、 102、 103和104中,它们可以被包含在可通过控制器依次读取位的外部存储器(EPROM或FLASH)中。 Look-up tables LUT1, LUT2, LUT3, and LUT4 are stored in four memories 101, 102, 103 and 104, they may be included in the readable bit external memory (EPROM or FLASH) of the sequentially by the controller. 通过外插模块105计算外插。 By extrapolation module 105 calculates an extrapolation. 该模块连接到图1的抖动模块110。 The module is connected to the dither module 110 of FIG. 在正常操作中,在每帧的结尾,需要通过控制器根据APL值下载新的LUTli和LUT2i数据,APL 值是在视频信号的有效部分期间基于视频数据计算出的。 In normal operation, at the end of each frame, and the need to download new LUTli LUT2i data according to the APL value by the controller, the APL value is calculated based on the video data during the active portion of the video signal.

与图1实现的方法需要108Mbit相比,该方法对于3种模式只需要(16x1024x(12 + 8) + 1024x(6 + 4))x3x3=2,9Mbit。 Compared with the method of implementation need 108Mbit FIG. 1, the process for only 3 modes (16x1024x (12 + 8) + 1024x (6 + 4)) x3x3 = 2,9Mbit. <table>table see original document page 12</column></row> <table><table>table see original document page 13</column></row> <table><table>table see original document page 14</column></row> <table><table>table see original document page 15</column></row> <table><table>table see original document page 16</column></row> <table><table>table see original document page 17</column></row> <table><table>table see original document page 18</column></row> <table><table>table see original document page 19</column></row> <table><table>table see original document page 20</column></row> <table><table>table see original document page 21</column></row> <table><table>table see original document page 22</column></row> <table><table>table see original document page 23</column></row> <table><table>table see original document page 24</column></row> <table><table>table see original document page 25</column></row> <table><table>table see original document page 26</column></row> <table><table>table see original <Table> table see original document page 12 </ column> </ row> <table> <table> table see original document page 13 </ column> </ row> <table> <table> table see original document page 14 < / column> </ row> <table> <table> table see original document page 15 </ column> </ row> <table> <table> table see original document page 16 </ column> </ row> <table> <table> table see original document page 17 </ column> </ row> <table> <table> table see original document page 18 </ column> </ row> <table> <table> table see original document page 19 < / column> </ row> <table> <table> table see original document page 20 </ column> </ row> <table> <table> table see original document page 21 </ column> </ row> <table> <table> table see original document page 22 </ column> </ row> <table> <table> table see original document page 23 </ column> </ row> <table> <table> table see original document page 24 < / column> </ row> <table> <table> table see original document page 25 </ column> </ row> <table> <table> table see original document page 26 </ column> </ row> <table> <table> table see original document page 26</column></row> <table><table>table see original document page 27</column></row> <table> document page 26 </ column> </ row> <table> <table> table see original document page 27 </ column> </ row> <table>

Claims (7)

  1. 1.一种对N个不同值中参数APL的给定值VAL生成查找表的设备,查找表的输出值可以通过取决于该给定值的变量S(VAL)的分段线性函数来近似,N个值的集合被分成P个连续值的子集合,所述分段线性函数的每段位于不同的子集合中,特征在于,该设备包括: 第一存储器(101),用于对每个子集合i存储与子集合i的最高边界值相关的主查找表PMTCi, 第二存储器(102),用于对每个子集合i存储与关于子集合i的辅查找表SMTCi和主查找表PMTCi之间的差相对应的增量查找表,辅查找表SMTCi与子集合i的最低边界值对应地相关, 第三存储器(103),用于对所述N个值中的每一个存储索引,该索引指示需要使用第一存储器(101)中的哪个主查找表和第二存储器(102)中的哪个增量查找表进行外插, 第四存储器(104),用于对所述N个值中的每一个存储外插系数C,与给定值相关的外插系数C(VAL) An N different values ​​for the parameters given APL value VAL generating apparatus lookup table, the lookup table output value can be approximated by a variable depending on the given value of S (VAL) is piecewise linear function, set of N values ​​being divided into P subsets of consecutive values ​​of one, each piece of the piecewise linear function is located in a different subset, characterized in that, the apparatus comprising: a first memory (101), for each sub- PMTCi set of primary look-up table, a second memory (102), for each subset i for finding the secondary lookup table stored on the subset i and SMTCi PMTCi between primary table associated with the highest limit value memory subset i of i corresponding to the difference of the delta look-up table, the secondary lookup table corresponding to the minimum limit value i SMTCi associated with the subset, a third memory (103) for storing an index for each of said N values, the index a first memory which indicate the need to use the main (101) and a second lookup table in memory which increments (102) a lookup table extrapolation, a fourth memory (104), for values ​​of the N each memory extrapolation coefficient C, as the given value related extrapolation coefficients C (VAL) 是根据对于所述给定值VAL的变量S的值S(VAL)和对于包括所述给定值的子集合i的两个边界值的变量S的值S(PMTCi),S(SMTCi)定义的;和计算模块(105),用于根据相关的外插系数C(VAL)、主查找表PMTCi和增量查找表,对给定值VAL生成查找表, 其中,参数是平均功率电平,变量S(VAL)是对应于参数的给定值VAL的维持脉冲数量。 Is a value for S (PMTCi) comprises two boundary values ​​of the subset i of a given value variable S, S (SMTCi) defined for the given value S (VAL) VAL and the variable S ; and a calculation module (105), for interpolation coefficient C according to the relevant outer (VAL), and the primary lookup table PMTCi delta look-up table for a given value VAL generating a lookup table, wherein the parameter is the average power level, variable S (VAL) is the number of sustain pulses corresponding to a given parameter value of VAL.
  2. 2. 如权利要求l所述的设备,特征在于,该设备对于每个平均功率电平值生成元代码查找表。 2. The apparatus as claimed in claim l, characterized in that the device generates a lookup table for each element code mean power level value.
  3. 3. 如权利要求2所述的设备,特征在于,与平均功率电平值的子集合的主查找表PMTCi有关的边界电平是该子集合的最高平均功率电平值,而与平均功率电平值的子集合的辅查找表SMTCi有关的边界电平是该子集合的最低平均功率电平值。 3. The apparatus of claim 2 with the average power requirements, characterized in that the primary lookup subset of average power level values ​​in a table associated PMTCi boundary level is the highest average power level value of the subset, border level subset of secondary level lookup table values ​​SMTCi about is the lowest average power level value of the subset.
  4. 4. 如权利要求1到3之一所述的设备,特征在于,对于子集合i中的一个边界值的变量值S(PMTCi)与对于子集合i+l中的同一边界值的变量值S(PMTCw)之间的比率等于固定参数ct。 4. The apparatus according to one of claims 1-3, characterized in that a limit value for the value of the variable i in subset S (PMTCi) with respect to the same limit value of the subset i + l values ​​of variables S ratio between (PMTCw) equal to the fixed parameters ct.
  5. 5.如权利要求4所述的设备,特征在于,参数a定义如下:其中Smax是峰但白色图像的变量S的值,而Smw是全白色图像的变量S的值。 5. The apparatus according to claim 4, characterized in that a parameter is defined as follows: wherein Smax is the peak value of the variable S but white image, and the value of the variable S Smw all-white image.
  6. 6. 如权利要求1、 2、 3、 5之一所述的设备,特征在于,外插系数C(VAL) 等于-<formula>formula see original document page 3</formula>其中,S(PMTCj)是对于子集合i的最高边界值的变量值;S(SMTCi)是对于子集合i的最低边界值的变量值;而S(VAL)是对于给定值的变量值。 6. The 1, 2, 3, 5 one of said apparatus, characterized in that the extrapolation coefficient C (VAL) as claimed in claim equal - <formula> formula see original document page 3 </ formula> where, S (PMTCj) highest limit value for the variable value of the subset i; S (SMTCi) for the lowest limit value of a variable subset of the value of i; and S (VAL) for a given variable value.
  7. 7. 如权利要求l、 2、 3、 5之一所述的设备,特征在于,计算出的查找表等于对于给定值VAL的主查找表PMTCj的输出与经过给定值VAL的外插系数加权的、对于给定值VAL的增量查找表PMTCi的输出之和。 7. as claimed in claim l, 2, 3, 5 one of said apparatus, characterized in that the lookup table is calculated equal to the lookup table PMTCj value VAL to the main output of extrapolation coefficients after the given value VAL weighting, for a given value VAL incremental output of lookup table and PMTCi.
CN 200480038029 2003-12-18 2004-12-14 Method and apparatus for generating a look-up table in the video picture field CN100545892C (en)

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CN1434966A (en) 2000-01-14 2003-08-06 富士通将军股份有限公司 Contrast adjustment circuit
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Publication number Priority date Publication date Assignee Title
EP0272655A2 (en) 1986-12-23 1988-06-29 Dainippon Screen Mfg., Co., Ltd. Method and apparatus for generating look-up table data
US5999581A (en) 1995-09-29 1999-12-07 University Of Waterloo Low-power direct digital frequency synthesizer architecture
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