公开(公告)号：WO2003069895A1

公开(公告)日：2003-08-21

申请号：PCT/IB2003/000413

申请日：2003-02-05

Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.

Inventor： STESSEN, Jeroen, H., C., J. ,  MACCATO, Andrea ,  OSLICK, Mitchell

IPC: H04N5/202

CPC classification number: H04N5/202

Abstract: A gamma correction circuit for correcting a digital video signal, the circuit comprising first (6) and second (8) lookup tables for storing discrete output intensity data and the associated slope data of a non-linear transfer function, respectively, for each of the discrete input video signal intensities, an adder (10) having a first input connected to the output of the first lookup table, a multiplier (12) having a first input connected to the output of the second look-up table (8), characterized by a quantizer (4) for providing the most significant bits of the incoming video signal to address the first (6) and second (8) lookup tables and to transfer the corresponding output intensity data to the adder (10) and the associated slope data to the multiplier (12), the quantizer (4) transmitting the remaining least significant bits of the input video signal to the second input of the multiplier (12), the multiplier (12) multiplying the slope data with the remaining least significant bits and feeding the multiplication result to the second input of the adder (10), the adder (10) adding the output intensity data and the multiplication result to generate a corrected video signal.

Abstract translation: 一种用于校正数字视频信号的伽马校正电路，该电路包括分别用于存储离散输出强度数据和非线性传递函数的相关斜率数据的第一（6）和第二（8）查找表， 离散输入视频信号强度，具有连接到第一查找表的输出的第一输入的加法器（10），具有连接到第二查找表（8）的输出的第一输入的乘法器（12），其特征在于 通过量化器（4），用于提供输入视频信号的最高有效位以寻址第一（6）和第二（8）查找表，并将相应的输出强度数据传送到加法器（10）和相关联的斜率数据 到乘法器（12），量化器（4）将输入视频信号的剩余最低有效位传送到乘法器（12）的第二输入，乘法器（12）将斜率数据与剩余的最低有效位 并将相乘结果馈送到加法器（10）的第二输入端，加法器（10）将输出强度数据和相乘结果相加以产生经校正的视频信号。