公开(公告)号：US20020159528A1

公开(公告)日：2002-10-31

申请号：US10072818

申请日：2002-02-08

Applicant: STMicroelectronics, S.r.I.

Inventor： Andrea Graziani ,  Luca Celetto ,  Daniele Alfonso ,  Fabrizio Basso ,  Alessandro Cremonesi ,  Danilo Pau

IPC: H04N007/12

CPC classification number: H04N19/40 ,  H04N19/90

Abstract: In order to generate, starting from an input MPEG bitstream, an output MPEG bitstream having at least one entity chosen among syntax, resolution, and bitrate modified with respect to the input bitstream, first portions and second portions are distinguished in the input bitstream, which respectively substantially do not affect and do affect the variation in bitrate. When at least one between the syntax and the resolution is to be modified, the first portions of the input bitstream are subjected to the required translation, then transferring said first portions subjected to syntax and/or resolution translation to the output bitstream. When the resolution is left unaltered, the second portions are transferred from the input bitstream to the output bitstream in the substantial absence of processing operations. When the resolution is changed, the second portions of the input bitstream are subjected to a filtering in the domain of the discrete cosine transform.

Abstract translation: 为了从输入MPEG比特流开始，输出MPEG比特流，其具有相对于输入比特流修改的语法，分辨率和比特率中选择的至少一个实体，在输入比特流中区分第一部分和第二部分，其中 分别基本上不影响并确实影响比特率的变化。 当要修改语法和分辨率之间的至少一个时，输入比特流的第一部分经受所需的翻译，然后将经过语法和/或分辨率转换的所述第一部分传送到输出比特流。 当分辨率保持不变时，在实质上没有处理操作的情况下，第二部分从输入比特流传送到输出比特流。 当分辨率改变时，输入比特流的第二部分在离散余弦变换的域中进行滤波。