GB/T 20090 specifies technical schemes for compression, decompression, processing and representation of digital audio and video and is applicable to applications such as high-resolution and standard-resolution digital television broadcasting, laser digital storage media, Internet broadband streaming media and multimedia communication.
This part of GB/T 20090 specifies diversified bit rate, resolution and quality of video compression methods as well as decoding process, and is applicable to digital television broadcasting, interactive storage media, direct broadcast satellite video services, multimedia mail, multimedia services on packet network and remote video surveillance.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to this part are encouraged to research whether the latest editions of these documents are applied or not. For undated references, the latest edition of the normative document applies.
GB/T 14857-1993 The Specifications of Encoding Parameters of Digital Television for Studio (eqv CCIR 601-3)
3 Term and Definitions
For the purpose of this part, the following terms and definitions apply.
3.1
Reserved
Some specific syntax element values are defined to be used for future expansion of this part.
Note: these values shall not appear in the bitstream in accordance with this part.
3.2
Bit string
The ordered sequence with limit bit, in which the leftmost bit is the most significant bit (MSB) and the rightmost bit is the least significant bit (LSB).
3.3
Bitstream
The binary data stream formed by the coded picture.
3.4
Bitstream buffer
The buffer for storing bitstream.
3.5
Bitstream order
The sort order of the coded picture in the bitstream, which is the same as the picture decoding order.
3.6
Variable length coding
One reversible entropy coding process, which allocates the short code word to the sign with relatively high frequency and the long code word to the symbol with relatively low frequency.
3.7
Transform coefficient
One scalar in the transform domain.
3.8
Encoding presentation
The form after the data encoding.
3.9
Encoding process
The process to produce the bitstream in accordance with this part.
Note: this process is not specified in this part.
3.10
Encoder
The realization of the encoding process.
3.11
Coded picture
Encoding presentation of one frame of picture.
3.12
Flag
One binarystate variable.
3.13
Compensation
The sum of the sample residual obtained by decoding the syntax element and its corresponding prediction value.
3.14
Residual
The difference between reconstructed value of the sample or data element and its prediction value.
GB/T 20090.2-2006 The following standards are cited：
