公开(公告)号：KR1020030083109A

公开(公告)日：2003-10-30

申请号：KR1020020021515

申请日：2002-04-19

Applicant: 대한민국(전남대학교총장)

Inventor： 홍성훈

IPC: H04N19/147 ,  H04N19/13

CPC classification number: H04N19/147 ,  H04N19/124 ,  H04N19/13

Abstract: PURPOSE: A bit rate transcoding device is provided to reduce the memory and the operation amount while carrying out the same operation with the existing bit rate transcoding device. CONSTITUTION: A bit rate transcoding device includes a target bit rate determining part(110) for determining a target bit rate allocatable to a current frame output from a variable length decoding part. A bit rate-distortion estimating part(120) estimates a distortion amount between the determined target bit rate determined and a bit rate generated by a quantization parameter employed per macro block unit from a difference signal output from a first adder. A target distortion determining part(130) determines an entire target distortion of nth frame currently transcoded from a signal output from the bit rate-distortion estimating part and the output signal from the target bit rate determining part. A quantization parameter determining part(140) determines a quantization parameter for generating distortion near the target distortion output from the target distortion determining part in a bit-rate/distortion curve for the bit rate and the distortion value output from the bit rate-distortion estimating part. Such a determined quantization parameter is output to a quantization par.

Abstract translation: 目的：提供比特率代码转换装置，以便在与现有的比特率代码转换装置执行相同的操作时减少存储器和操作量。 构成：比特率代码转换装置包括目标比特率确定部分（110），用于确定可分配给可变长度解码部分输出的当前帧的目标比特率。 比特率失真估计部分（120）根据从第一加法器输出的差分信号估计所确定的确定的目标比特率与由每个宏块单元采用的量化参数产生的比特率之间的失真量。 目标失真确定部分（130）从从比特率失真估计部分输出的信号和来自目标比特率确定部分的输出信号中确定当前被转码的第n帧的整个目标失真。 量化参数确定部分（140）确定用于在比特率的比特率/失真曲线中从目标失真确定部分输出的目标失真附近产生失真的量化参数和从比特率 - 失真估计输出的失真值 部分。 这样确定的量化参数被输出到量化参数。