ISO IEC 15444-4:2021 pdf download – Information technology — JPEG 2000 image coding system — Part 4: Conformance Testing.
3.6 bit-plane : A two-dimensional array of bits. In this Recommendation | International Standard, a bit-plane refers to all the bits of the same magnitude in all coefficients or samples. This could refer to a bit-plane in a component, tile- component, code-block, region of interest, or other. 3.7 bitstream : The actual sequence of bits resulting from the coding of a sequence of symbols. It does not include the markers or marker segments in the main and tile-part headers or the end of codestream marker. It does include any packet headers and in stream markers and marker segments not found within the main or tile-part headers. 3.8 box : A portion of the file format defined by a length and unique box type. Boxes of some types may contain other boxes. 3.9 byte : Eight bits. 3.10 Cclass : Defines a level of performance for a decoder. Also provides guidance for encoders to produce codestreams that are easily decodable by compliant decoders. 3.11 code-block : A rectangular grouping of coefficients from the same sub-band of a tile-component. 3.12 coder : An embodiment of either an encoding or decoding process. 3.13 codestream : A collection of one or more bitstreams and the main header, tile-part headers, and the end of codestream required for their decoding and expansion into image data. This is the image data in a compressed form with all of the signalling needed to decode. This does not include the file format. 3.14 coding pass : A procedure accessing coefficients in a code-block where the context and bit are determined. Typically, there are three different coding passes for each bit-plane, each coefficient will be represented in exactly one of the three passes. For an encoder a coding pass examines coefficients and augments a bitstream. For a decoder a coding pass reads a bitstream and updates coefficients. 3.15 coefficient : The values that are the result of a transformation. 3.16 component : A two-dimensional array of samples. An image typically consists of several components (e.g., red, green, and blue). 3.17 compressed image data : Part or all of a codestream. Can also refer to a collection of bitstreams in part or all of a codestream. 3.18 compliance : Fulfilment of the specified requirements, as defined in this Recommendation | International Standard, for a given Profile and Cclass. 3.19 compliance test procedure: The process of assessing compliance. 3.20 context : Function of coefficients previously decoded and used to condition the decoding of the present coefficient. 3.21 decoder : An embodiment of a decoding process, and optionally a colour transformation process. 3.22 decoding process: A process that takes as its input all or part of a codestream and outputs all or part of a reconstructed image.
ISO IEC 15444-4:2021 pdf download – Information technology — JPEG 2000 image coding system — Part 4: Conformance Testing
