CN1414779A - 修正图像分块假象的设备和方法 - Google Patents
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- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
Abstract
修正图像分块假象的设备和方法能够首先消除出现在依次输入视频信号中的图像分块假象。修正图像分块假象的设备包括:视频信号比较单元,用于比较在预定时间间隔内依次输入的视频信号的灰度值,当在依次输入的视频信号中出现图像分决假象时,该视频信号比较单元确定灰度值之间的差值是否满足某一条件;和运算处理单元,用于当确定出现图像分块假象时,通过相加/相减输入视频信号的灰度值消除图像分块假象。通过消除出现在依次输入视频信号中的图像分块假象,图像分块假象修正设备可以在液晶显示器上提供更清晰的图像。
Description
技术领域
本发明一般涉及修正图像分块假象的设备和方法,尤其涉及修正出现在像液晶显示器(LCD)那样的显示系统中的图像分块假象的设备和方法。本发明是基于韩国专利申请第2001-65226号的,特此引用,以供参考。
背景技术
一般说来,像液晶显示器(LCD)、等离子显示系统、和发光二极管(LED)那样的显示器件通过控制以矩阵形式排列的数个像素的打开/关闭来显示图像。这种对各个像素进行打开/关闭控制的显示器件只能够以两种方式显示图像,即,发光/不发光或透明/不透明。
图1是示意性地显示一般LCD的胞状结构的图形。参照图1,数个像素以4×9矩阵的形式排列着。每个像素被划分成主像素11和次像素13。主像素11与次像素的发光强度比是8∶1,并且,主像素11和次像素13通过灰度的表达按时间顺序激发。例如,如果灰度是十五(15),那么,激发次像素13十五(15)次。如果灰度是十六(16),那么,激发主像素11两(2)次。在图1所示的例子中,从第1列到第3列激发次像素13,从第4列到第6列激发主像素11,和从第7列到第9列激发次像素13。
传统上,按时间顺序激发每个像素,但是,偶尔,会出现依次激发的像素在人眼看来其灰度与实际灰度不同的情况。在下文中,这样的情况被称为“图像分块假象”。当发生图像分块假象时,用户可能把两个相继的列看成一个列。并且,他/她可能按照15灰度、15灰度、31灰度、16灰度、0灰度、15灰度和15灰度的次序看到像素的各个列。因此,在用户看来,在激发次像素13之后激发主像素11的情况下,他/她将看到暗31灰度。然后,在激发主像素11之后激发次像素13的情况下,他/她将看到引起线与线之间的中断的0灰度。
发明内容
本发明就是为了克服现有技术中的上述问题而作出的。因此,本发明的目的是提供一种修正由于像液晶显示器那样的显示器件的结构引起的图像分块假象的设备和方法。
上面目的是通过根据本发明修正图像分块假象的设备来实现的,这种设备包括:视频信号比较单元,用于比较在预定时间间隔内依次输入的视频信号的灰度值,当在依次输入的视频信号中出现图像分块假象时,该视频信号比较单元确定灰度值之间的差值是否满足某一条件;和运算处理单元,用于当确定出现图像分块假象时,通过相加/相减输入视频信号的灰度值消除图像分块假象。
视频信号比较单元包括索引生成单元,用于生成当确定出现图像分块假象时,命令相加/相减输入到运算处理单元的视频信号的灰度值的索引。
运算处理单元包括视频信号调制单元,用于调制输入视频信号,以便可以输出相加/相减所得的灰度值。
当依次输入的视频信号的前视频信号的灰度值满足某一条件时,视频信号比较单元比较依次输入视频信号的灰度值。
当前视频信号的灰度值除以预定数所得的余数等于预定值时,视频信号比较单元比较依次输入视频信号的灰度值。
根据本发明,修正图像分块假象的设备比较依次输入视频信号的灰度值。当存在含有图像分块假象的可能性时,该设备通过对输入信号的灰度值相加或相减预定灰度值,使图像分块假象达到最小。
根据本发明,修正图像分块假象的方法包括如下步骤:比较在预定时间间隔内依次输入的视频信号的灰度值;当在依次输入的视频信号中出现图像分块假象时,确定灰度值之间的差值是否满足某一条件;和当确定出现图像分块假象时,通过相加/相减依次输入视频信号的灰度值消除图像分块假象。
附图说明
通过结合附图对本发明的优选实施例进行如下详细描述,本发明的上述目的和特征将更加清楚,在附图中:
图1是示意性地显示传统液晶显示器的胞状结构的图形;
图2是示意性地显示根据本发明修正图像分块假象的设备的方块图;
图3是显示可在像素中显示的灰度的可变区域;和
图4是说明图2所示的修正图像分块假象的过程的流程图。
具体实施方式
从现在开始,将参照附图详细描述本发明。
图2示意性地显示了根据本发明修正图像分块假象的设备。如图2所示,图像分块假象修正设备包括图像延迟单元21、视频信号比较单元2 3和运算处理单元25。视频信号比较单元23含有索引生成单元23a。此外,运算处理单元25含有视频信号调制单元25a。
图像延迟单元21把输入视频信号延迟预定时间间隔。最好把图像延迟单元21进行的预定延迟时间设置成与输入视频信号的每个帧所需的时间间隔一样长。并且,最好,在先进先出型缓冲器中构造图像延迟单元21,在这样的先进先出型缓冲器中,图像延迟单元21在输出信号之前,临时存储输入的视频信号达预定时间。
视频信号比较单元23比较在预定时间间隔内依次输入的视频信号的灰度值。当存在出现在依次输入视频信号之间的图像分块假象时,视频信号比较单元23确定比较的视频信号之间的差值是否满足某一条件。
当视频信号比较单元23确定存在出现在依次输入视频信号中的图像分块假象时,索引生成单元23a生成给出相加/相减输入到运算处理单元25的视频信号的灰度值、以便消除含有图像分块假象的可能性的命令的索引。
当确定在依次输入视频信号中存在含有图像分块假象的可能性时,运算处理单元25相加/相减输入视频信号的灰度值,从而消除含有图像分块假象的可能性。
当确定在依次输入视频信号中存在含有图像分块假象的可能性时,视频信号调制单元25a调制输入的视频信号,以便可以将输入的视频信号与运算处理单元25相加/相减所得的灰度值一起输出。图3显示了当确定在依次输入视频信号中存在含有图像分块假象的可能性时,可以相加/相减以便调制输入视频信号的灰度值的可用范围。灰度的一般范围在14与241之间。
图4显示了图2所示的修正图像分块假象的过程的流程图。如图4所示,首先,把以帧为单元的视频信号依次输入到图像分块假象修正设备(步骤S101)。如上所述,输入视频信号具有从14到241的灰度值。在输入视频信号中,把前输入信号延迟预定时间,以便可以将前信号与后输入信号一起输入视频信号比较单元23。
图像延迟单元21把输入视频信号延迟预定时间(步骤S103)。图像延迟单元21可以通过先进/先出型缓冲器来实现。把经过图像延迟单元21延迟的视频信号与没有延迟的后输入信号一起输入视频信号比较单元23。延迟的输入视频信号和未延迟的输入视频信号是相互一起输入视频信号比较单元23中的。可选地,可以把延迟一次和延迟两次的输入视频信号输入视频信号比较单元23。必须把依次输入视频信号输入单元23的视频信号同时输入视频信号比较单元23。
视频信号比较单元23确定相除前视频信号的灰度值所得的余数是否对应于某个值(步骤S105、S113、S119、S125)。如果相除前视频信号的灰度值所得的余数对应于某个值,那么,视频信号比较单元23确定对后输入视频信号的灰度值相加或相减某个灰度值所得的灰度值是否对应于前输入视频信号的灰度值(步骤S107、S115、S121、S127)。换句话说,视频信号比较单元23确定前输入视频信号的灰度值与后输入视频信号的灰度值之间的差值是否满足某一条件。
当确定对后输入视频信号的灰度值相加或相减某个灰度值所得的灰度值对应于前输入视频信号的灰度值时,即,当确定前输入视频信号的灰度值与后输入视频信号的灰度值之间的差值对应于某个值时,索引生成单元23a生成各个索引(步骤S109、S117、S123、S129)。把索引生成单元23a生成的索引发送到运算处理单元25。视频信号比较单元23把前输入视频信号和后输入视频信号发送到运算处理单元25,以便可以修正出现在依次输入的视频信号中的图像分块假象。
运算处理单元25从索引生成单元23a中接收索引,相加/相减输入视频信号的灰度值,以便消除在输入视频信号中含有图像分块假象的可能性。这时,根据接收的索引,运算处理单元25确定相加还是相减输入视频信号的灰度值。此外,运算单元25的视频信号调制单元25a调制输入视频信号,以便可以将输入视频信号与运算处理单元25相加/相减所得的视频信号的灰度值一起输出(步骤S111)。可以调制前输入视频信号或者后输入视频信号。可选地,也可以调制前和后输入视频信号两者。
当确定对后输入视频信号的灰度值相加或相减某个灰度值所得的灰度值不满足前输入视频信号的灰度值时,视频信号比较单元23终止图像分块假象修正过程,并且为修正下一个输入视频信号的图像分块假象的过程作好准备。
当确定前输入视频信号除以预定数所得的余数不对应于任何预置值时,视频信号比较单元23终止修正输入视频信号的图像分块假象的过程,并且为对下一个输入视频信号修正图像分块假象的过程作好准备。
图4显示了当将输入视频信号的灰度值除以十六(16)所得的余数对应于14、15、0和1的任何一个时进行的图像分块假象修正的例子。这是基于当将依次输入视频信号的灰度值除以十六(16)所得的余数落入+2~-2的范围内时,存在含有图像分块假象的可能性很大这一事实的。但是,这未必意味着只有当将输入视频信号的灰度值除以十六(16)所得的余数对应于14、15、0和1中的任何一个时,才修正图像分块假象。
如上所述,根据将输入视频信号的灰度值除以十六(16)所得的余数确定依次输入视频信号的灰度值之间的差值是二(2)还是三(3)。但是,应该注意到,这正是基于依次输入视频信号的灰度值之间的2或3的差值指示含有图像分块假象的可能性很大这一事实的。因此,未必利用某些有限数字来修正图像分块假象。
如上所述,根据本发明的图像分块假象修正设备通过修正降低了出现图像分块假象的可能性,防止了以帧为单元依次输入的视频信号之间的图像分块假象的出现。
尽管已经描述了本发明的优选实施例,但是,本领域的普通技术人员应该明白,本发明不限于上述优选实施例,而是在如所附权利要求书限定的本发明的精神和范围内,可以进行各种各样的改变和改进。
Claims (10)
1.一种修正图像分块假象的设备,包括:
视频信号比较单元,用于比较在预定时间间隔内依次输入的视频信号的灰度值,当在依次输入的视频信号中出现图像分块假象时,该视频信号比较单元确定灰度值之间的差值是否满足某一条件;和
运算处理单元,用于当确定出现图像分块假象时,通过相加/相减输入视频信号的灰度值消除图像分块假象。
2.根据权利要求1所述的修正图像分块假象的设备,其中,视频信号比较单元包括索引生成单元,用于生成当确定出现图像分块假象时,命令相加/相减输入到运算处理单元的视频信号的灰度值的索引。
3.根据权利要求2所述的修正图像分块假象的设备,其中,运算处理单元包括视频信号调制单元,用于调制输入视频信号,以便可以输出相加/相减所得的灰度值。
4.根据权利要求3所述的修正图像分块假象的设备,其中,当依次输入的视频信号的前视频信号的灰度值满足某一条件时,视频信号比较单元比较依次输入视频信号的灰度值。
5.根据权利要求4所述的修正图像分块假象的设备,其中,当前视频信号的灰度值除以预定数所得的余数等于预定值时,视频信号比较单元比较依次输入视频信号的灰度值。
6.一种修正图像分块假象的方法,包括如下步骤:
比较在预定时间间隔内依次输入的视频信号的灰度值;
当在依次输入的视频信号中出现图像分块假象时,确定灰度值之间的差值是否满足某一条件;和
当确定出现图像分块假象时,通过相加/相减依次输入视频信号的灰度值消除图像分块假象。
7.根据权利要求6所述的修正图像分块假象的方法,还包括如下步骤:生成命令相加/相减输入到运算处理单元的视频信号的灰度值的索引。
8.根据权利要求7所述的修正图像分块假象的方法,还包括如下步骤:调制视频信号,以便可以输出相加/相减所得的灰度值。
9.根据权利要求8所述的修正图像分块假象的方法,其中,只有当依次输入视频信号的前视频信号的灰度值满足某个条件时,才执行比较步骤。
10.根据权利要求9所述的修正图像分块假象的方法,其中,只有当前视频信号的灰度值除以预定数所得的余数等于预定值时,才执行比较步骤。
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US7339601B2 (en) * | 2003-07-10 | 2008-03-04 | Samsung Electronics Co., Ltd. | Methods of suppressing ringing artifact of decompressed images |
TWI391900B (zh) * | 2008-04-28 | 2013-04-01 | Novatek Microelectronics Corp | 用於低色偏液晶顯示器之資料驅動電路 |
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JPH0667620A (ja) * | 1991-07-27 | 1994-03-11 | Semiconductor Energy Lab Co Ltd | 画像表示装置 |
US5714974A (en) * | 1992-02-14 | 1998-02-03 | Industrial Technology Research Laboratories | Dithering method and circuit using dithering matrix rotation |
US5337160A (en) * | 1992-07-01 | 1994-08-09 | Hewlett-Packard | Error diffusion processor and method for converting a grey scale pixel image to a binary value pixel image |
US6295041B1 (en) * | 1997-03-05 | 2001-09-25 | Ati Technologies, Inc. | Increasing the number of colors output by an active liquid crystal display |
US6034663A (en) * | 1997-03-10 | 2000-03-07 | Chips & Technologies, Llc | Method for providing grey scale images to the visible limit on liquid crystal displays |
JPH118765A (ja) * | 1997-06-16 | 1999-01-12 | Mitsubishi Electric Corp | 低階調化処理方法、低階調化処理装置、低階調化処理用集積回路および低階調化プログラムを記録したコンピュータ読み取り可能な記録媒体 |
JP3611433B2 (ja) * | 1997-10-08 | 2005-01-19 | シャープ株式会社 | 画像表示装置及び画像表示方法 |
US6441829B1 (en) * | 1999-09-30 | 2002-08-27 | Agilent Technologies, Inc. | Pixel driver that generates, in response to a digital input value, a pixel drive signal having a duty cycle that determines the apparent brightness of the pixel |
JP2001117074A (ja) * | 1999-10-18 | 2001-04-27 | Hitachi Ltd | 液晶表示装置 |
JP4421722B2 (ja) * | 1999-12-14 | 2010-02-24 | シャープ株式会社 | 液晶表示装置、駆動方法及び駆動回路 |
JP2002082645A (ja) * | 2000-06-19 | 2002-03-22 | Sharp Corp | 画像表示装置の列電極駆動回路及びそれを用いた画像表示装置 |
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CN1180611C (zh) | 2004-12-15 |
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