標準號：ISO/IEC 23002-1-2006
中文標準名稱：信息技術.MPEG視頻技術.第1部分:執行8x8整數輸出反向離散余弦轉換的精度要求
英文標準名稱：Information technology - MPEG video technologies - Part 1: Accuracy requirements for implementation of integer-output 8x8 inverse discrete cosine transform
標準類型：L81
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：L81
國際標準分類號：35.040
適用范圍：A number of image and video coding related standards (see Bibliography) include a requirement for decodersto implement an integer-output 8x8 inverse discrete cosine transform (IDCT) for the generation of inversetransformedsample differences with a nominal range from –2B to (2B)–1 for some integer number of bits B,where B is greater than or equal to 8. This part of ISO/IEC 23002 specifies conformance requirements forestablishing sufficient accuracy in such an integer-output IDCT implementation. It is intended to be suitablefor reference to establish partial or complete requirements for IDCT accuracy for conformance to otherstandards that require IDCT use.The accuracy requirements specified in the main body of this part of ISO/IEC 23002 are essentially the sameas those previously specified in [7], in Annex A of [1], and in Annex A of [5]. These requirements have beenspecified herein to resolve normative references to [7] in MPEG standards after its withdrawal and to provideimproved clarity for the specification of IDCT accuracy requirements.An additional requirement on encoded-bitstream intra refresh frequency was also previously specified in [7],establishing a requirement of bitstream conformance that each macroblock be intra-coded at least once withineach series of 132 times that it is coded in a predicted picture without an intervening intra picture. Thatadditional requirement is not specified in this part of ISO/IEC 23002, in order to confine its scope to thedomain of decoder conformance specification.Some allowances for modification of the specified accuracy requirements are made within this part ofISO/IEC 23002. Additional accuracy requirements that may be invoked by a referencing specification arespecified in Annexes A and B.