公开(公告)号：US20040189679A1

公开(公告)日：2004-09-30

申请号：US10812056

申请日：2004-03-30

Applicant: NEC LCD TECHNOLOGIES, LTD

Inventor： Masahiro Ito ,  Takashi Watanabe

IPC: G09G005/10 ,  G09G005/02

CPC classification number: G09G3/20 ,  G09G3/2051 ,  G09G3/36 ,  G09G2320/0276

Abstract: A video processor comprises a bit rate converter for converting an M-bit input video signal to an N-bit output video signal by retaining gray levels of the M-bit input video signal (where, N is smaller than M). A number of N-bit input gray levels are mapped in a gamma correction memory to a number of output gray levels. The output gray levels are distributed on a non-linear curve complementary to a non-linear curve on which gray levels of a display device are distributed. The memory delivers one of the output gray levels when the N-bit output video signal of the bit rate converter corresponds to one of the N-bit input gray levels. In one embodiment, the bit rate converter truncates lower significant bits of the M-bit video signal, represents the truncated bits by a different number of binary-1's, and distributes the binary-1's over a varying number of subsequent frames depending on the value of the truncated bits.

Abstract translation: 视频处理器包括一个比特率转换器，用于通过保持M位输入视频信号（其中，N小于M）的灰度级将M位输入视频信号转换成N位输出视频信号。 将多个N位输入灰度级映射到伽马校正存储器中到多个输出灰度级。 输出灰度级分布在与其上分布有显示设备的灰度级的非线性曲线互补的非线性曲线上。 当比特率转换器的N位输出视频信号对应于N位输入灰度级之一时，存储器输出一个输出灰度级。 在一个实施例中，比特率转换器截断M位视频信号的较低有效位，用不同数量的二进制1表示截断的比特，并根据该值分配不同数量的后续帧的二进制1 的截断位。