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US 10,257,537 B2Granted
Moving picture coding method and moving picture decoding method
AssigneePanasonic Intellectual Property Corporation of America
InventorsShinya Kadono, Satoshi Kondo, Makoto Hagai
Life of this patent
Estimating the term…
Abstract
A moving picture coding apparatus includes a counter unit which counts the number of pictures following an intra coded picture; and a motion estimation unit which compares respectively only reference pictures which are the intra coded picture or the following pictures, selected from among a reference picture Ref1, a reference picture Ref2 and a reference picture Ref3 stored in memories, with a picture signal, and determines the reference picture whose inter picture differential value is smallest.
Claims2
A picture decoding method for decoding a bit stream of a coded picture, wherein the bit stream is obtained by coding an input picture using the following steps:
- (1) a step of generating information indicating whether a first input picture is coded, by using an intra picture coding method, as an intra coded picture specified as a specified I-picture or a first input picture is coded, by using an intra picture coding method, as an intra coded picture not specified as a specified I-picture, wherein the specified I-picture is used for restricting selection of a reference picture when coding, by using an inter picture coding method, a picture located in display order after the intra coded picture specified as a specified I-picture,
- (2) a step of (i) coding, by using an intra picture coding method, the first input picture as an intra coded picture specified as a specified I-picture or (ii) coding, by using an intra picture coding method, the first input picture as an intra coded picture not specified as a specified I-picture, and
- (3) a step of coding, by using an inter picture coding method, a second input picture located in display order after the intra coded picture,
- the picture decoding method comprising:
- a step of decoding the bit stream to obtain information indicating whether a target picture to be decoded is an intra coded picture specified as a specified I-picture or a target picture to be decoded is an intra coded picture not specified as a specified I-picture;
- a step of decoding the bit stream, by using an intra picture decoding method, to obtain a first decoded picture;
- and
- a step of decoding the bit stream, by using an inter picture decoding method, to obtain a second decoded picture,
- wherein in a case where the first decoded picture is an intra decoded picture specified as a specified I-picture, for the second decoded picture which is decoded, by using the inter picture decoding method, after the intra decoded picture specified as a specified I-picture,
- at least one of the following pictures is selected as a reference picture in the decoding of the second decoded picture:
- the specified I-picture and a picture decoded after the specified I-picture, while a picture which is decoded before the specified I-picture is prohibited from being selected as a reference picture, and
- wherein in a case where the first decoded picture is an intra decoded picture not specified as a specified I-picture, for the second decoded picture which is decoded, by using the inter picture decoding method, after the intra decoded picture not specified as a specified I-picture,
- at least one of the following pictures is selected as a reference picture in the decoding of the second decoded picture:
- the intra decoded picture not specified as a specified I-picture, a picture which is decoded before the intra decoded picture not specified as a specified I-picture, and a picture which is decoded after the intra decoded picture not specified as a specified I-picture.
11 more elements
A picture decoding apparatus which decodes a bit stream of a coded picture, wherein the bit stream is obtained by coding an input picture using the following units:
- (1) a unit configured to generate information indicating whether a first input picture is coded, by using an intra picture coding unit, as an intra coded picture specified as a specified I-picture or a first input picture is coded, by using an intra picture coding unit, as an intra coded picture not specified as a specified I-picture, wherein the specified I-picture is used for restricting selection of a reference picture when coding, by using an inter picture coding unit, a picture located in display order after the intra coded picture specified as a specified I-picture,
- (2) a unit configured to (i) code, by using an intra picture coding unit, the first input picture as an intra coded picture specified as a specified I-picture or configured to (ii) code, by using an intra picture coding unit, the first input picture as an intra coded picture not specified as a specified I-picture, and
- (3) a unit configured to code, by using an inter picture coding unit, a second input picture located in display order after the intra coded picture,
- the picture decoding apparatus comprising:
- an information decoding unit configured to decode the bit stream to obtain information indicating whether a target picture to be decoded is an intra coded picture specified as a specified I-picture or a target picture to be decoded is an intra coded picture not specified as a specified I-picture;
- a first decoding unit configured to decode the bit stream, by using an intra picture decoding unit, to obtain a first decoded picture;
- and
- a second decoding unit configured to decode the bit stream, by using an inter picture decoding unit, to obtain a second decoded picture,
- wherein in a case where the first decoded picture is an intra decoded picture specified as a specified I-picture, for the second decoded picture which is decoded, by using the inter picture decoding unit, after the intra decoded picture specified as a specified I-picture,
- at least one of the following pictures is selected as a reference picture in the decoding of the second decoded picture:
- the specified I-picture and a picture decoded after the specified I-picture, while a picture which is decoded before the specified I-picture is prohibited from being selected as a reference picture, and
- wherein in a case where the first decoded picture is an intra decoded picture not specified as a specified I-picture, for the second decoded picture which is decoded, by using the inter picture decoding unit, after the intra decoded picture not specified as a specified I-picture,
- at least one of the following pictures is selected as a reference picture in the decoding of the second decoded picture:
- the intra decoded picture not specified as a specified I-picture, a picture which is decoded before the intra decoded picture not specified as a specified I-picture, and a picture which is decoded after the intra decoded picture not specified as a specified I-picture.
11 more elements
Dependencies are inferred from the claim text.