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1. 发明申请

US20090141176A1 GRAY-SCALE CORRECTING DEVICE 审中-公开
标题翻译：灰度校正装置
公开(公告)号：US20090141176A1
公开(公告)日：2009-06-04
申请号：US12064286
申请日：2007-06-11
申请人： Naoaki Tomisaka , Kenji Tamura , Yuichiro Takahashi
发明人： Naoaki Tomisaka , Kenji Tamura , Yuichiro Takahashi
IPC分类号： H04N5/14
CPC分类号： H04N5/20 , G09G3/2007 , G09G5/02 , G09G2320/0247 , G09G2320/0276 , G09G2320/0285 , G09G2320/106 , G09G2340/16 , G09G2360/16
摘要： An amount of change calculated by an amount-of-change calculator (11) is stored in an amount-of-change storage (12), and an amount-of-change comparison unit (13) compares an amount of change between a frame one frame before a frame whose gradation is to be corrected and a frame before that frame. If the amount of change is larger than a predetermined value, correction value data of the frame one frame before is not used, but a correction value table of a frame before the change is chosen and read from a correction value calculator (15). If the amount of change is equal to or smaller than a predetermined value, a correction value table of the frame one frame before which did not changed much is read from the correction value calculator (15) and is written to a lookup table (16). Correction data (level data) is read from the lookup table (16) at an address and is outputted as a gradation-corrected luminance signal. In this way, based on an amount of change in a screen and according to a frame whose gradation is to be corrected, optimum correction data is chosen and gradation correction is performed, and thus optimum gradation correction can be done without a frame memory.
摘要翻译：由变化量计算器（11）计算的变化量存储在变化量存储器（12）中，并且变化量比较单元（13）将帧间变化量在其灰度被校正的帧之前的一帧和该帧之前的帧。如果变化量大于预定值，则不使用前一帧的校正值数据，而是从校正值计算器（15）中选择并读出改变之前的帧的校正值表。如果改变量等于或小于预定值，则从校正值计算器（15）读取一帧之前没有变化很大的帧的校正值表，并将其写入查找表（16）。从查找表（16）以地址读取校正数据（电平数据），并作为灰度校正亮度信号输出。以这种方式，基于屏幕的变化量和根据要校正其灰度的帧，选择最佳校正数据并执行灰度校正，因此可以在没有帧存储器的情况下进行最佳灰度校正。

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