For the purposes of this document, the following terms and definitions apply:
Bitstream
: The sequence of bits generated by encoding a sequence of pictures.
Bit string
: An ordered string with a limited number of bits. The left most bit is the most significant bit (MSB) and the right most bit is the least significant bit (LSB).
Byte
: An 8-bit bit string.
Byte alignment
: One bit, byte, or syntax element is byte aligned if the position of the bit, byte, or syntax element, respectively in the bitstream is an integer multiple of eight from the position of the first bit in the bitstream.
Chroma
: A sample value matrix or a single sample value of one of the two color difference signals.
Note: Symbols of chroma are U and V or Cb and Cr. {:.alert .alert-info }
Coded picture
: The representation of one picture before the decoding process.
Coded video sequence
: A coded video sequence is a sequence of access units or temporal units that consists of a random access point, which is followed by zero or more access units or temporal units up to but not including the subsequent random access point.
Component
: One of the three sample value matrices (one luma matrix and two chroma matrices) or its single sample value.
Decoded picture
: The picture reconstructed out of the bitstream by the video decoder.
Field
: A collection of samples from alternate rows of a frame. A frame is composed of two fields, a top field and a bottom field.
Film grain analysis process
: A process not specified in this Specification that generates film grain parameters that conforms to the description provided in this document.
Film grain analyzer
: One embodiment of the film grain analysis process.
Film grain synthesis module
: One embodiment of the film grain synthesis process.
Film grain synthesis process
: The process that derives film grain parameters from syntax elements, including any processing steps used for the film grain synthesis process.
Flag
: A binary variable - some variables and syntax elements (e.g. video_signal_characteristics_flag) are described using the word flag to highlight that the syntax element can only be equal to 0 or equal to 1.
Frame
: A composition of samples that constitute an entire image and includes samples from a top and a bottom field, where the top and bottom fields correspond to samples from even and odd numbered rows respectively. A frame may be composed of one luma sample matrix (Y) and optionally two chroma sample matrices (U and V).
Key picture
: An Intra picture which resets the decoding process when it is shown.
Luma
: A sample value matrix or a single sample value representing the monochrome signal related to the primary colors.
Note: The symbol representing luma is Y. {:.alert .alert-info }
Parse
: The procedure of getting the syntax element from the bitstream.
Picture
: The representation of video signals in the spatial domain, composed of one luma sample matrix (Y) and , optionally, two chroma sample matrices (U and V) in a 4:2:0, 4:2:2, 4:4:4, 4:0:0 color format. The picture could be either a frame or a field.
Profile
: A subset of syntax, semantics, and algorithms defined in a part.
Raster scan
: Maps a two dimensional rectangular raster into a one dimensional raster, in which the entry of the one dimensional raster starts from the first row of the two dimensional raster, and the scanning then goes through the second row and the third row, and so on. Each raster row is scanned in left to right order.
Random Access Point (RAP)
: A picture, at which a decoder may start decoding a coded video sequence.
Reconstruction
: Obtaining the addition of the decoded residual and the corresponding prediction values.
Reference
: One of a set of tags, each of which is mapped to a reference picture.
Reserved
: A special syntax element value which may be used to extend this part in the future.
Sample
: The basic elements that compose the picture.
Sample value
: The value of a sample. This is an number in the range from the minimum sample value to the maximum sample value.
Sequence
: The highest level syntax structure of coding bitstream, including one or several consecutive coded picture.
Syntax element
: An element of data represented in the bitstream.
Video decoder
: One embodiment of the video decoding process.
Video decoding process
: The process that derives decoded pictures from syntax elements, including any processing steps used prior to and after generating the decoded video pictures.
Video encoding process
: A process not specified in this Specification that generates a video bitstream.