IMAGE ENCODING DEVICE AND IMAGE DECODING DEVICE

• US 20130003852A1
• Filed: 12/27/2010
• Published: 01/03/2013
• Est. Priority Date: 02/24/2010
• Status: Active Grant

• Current Assignee: Velos Media, LLC (Inception Holdings, LLC)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yamamoto, Tomoyuki
• Granted Patent: US 9,832,465 B2
• Time in Patent Office: Days
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/11 among a plurality of spatial predictive coding modes
• CPC Class Codes: H04N 19/197 including determination of the initial value of an encoding parameter H04N19/56 takes precedence
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

An image encoding device includes a first prediction parameter determination section (53) for selecting, for each of prediction units belonging to a first group, a prediction parameter from a basic set; a second prediction parameter determination section (55) for selecting, for each of prediction units belonging to a second group, a prediction parameter from a reduced set (i) including at least a part of the prediction parameter(s) selected by the first prediction parameter determination section (53) and (ii) is constituted by a prediction parameter(s), the number of which is not more than the number of prediction parameters included in the basic set; and a prediction parameter encoding section (243) for encoding (i) information indicating which one of prediction parameters is selected by the first prediction parameter determination section (53) and (ii) information indicating which one of prediction parameters is selected by the second prediction parameter determination section (55).

Claims

1-19. -19. (canceled)

20. An image decoding device for decoding encoded data which is obtained in such a manner that (i) a difference between an input image and a prediction image is encoded for each of a plurality of prediction units, and (ii) a prediction parameter used to generate the prediction image is encoded, the image decoding device comprising:

prediction parameter decoding means for decoding a prediction parameter which is to be applied to each of the plurality of prediction units; and

reduced set creating means for creating a reduced set which is a group of prediction parameters,

the reduced set including at least one prediction parameter included in a proximity prediction unit region with respect to a target prediction unit selected from the plurality of prediction units,

the number of prediction parameters included in the reduced set being less than the number of prediction parameters included in a basic set which is constituted by predetermined prediction parameters,

the prediction parameter decoding means carrying out

decoding, per prediction unit, in accordance with a value of a flag which is included, per prediction unit, in the encoded data, so that one of (i) a first prediction parameter which specifies one of the prediction parameters included in the basic set, and (ii) a second prediction parameter which specifies one of the prediction parameters included in the reduced set, is decoded.

21. The image decoding device as set forth in claim 20, wherein:

each of the prediction parameters is a motion vector used in motion compensation prediction.

22. An image encoding device for encoding a difference between an input image and a prediction image, comprising:

prediction parameter encoding means for encoding a prediction parameter which is applied to each of a plurality of prediction units; and

reduced set creating means for creating a reduced set which is a group of prediction parameters,

the reduced set including at least one prediction parameter included in a proximity prediction unit region with respect to a target prediction unit selected from the plurality of prediction units,

the number of prediction parameters included in the reduced set being less than the number of prediction parameters included in a basic set,

the prediction parameter encoding means encoding, per prediction unit, a flag for designating which one of (i) a first prediction parameter which specifies one of the prediction parameters included in the basic set, and (ii) a second prediction parameter which specifies one of the prediction parameters included in the reduced set is encoded.

23. An image decoding device for decoding encoded data which is obtained in such a manner that (i) a difference between an original image and a prediction image is encoded for each of a plurality of prediction units, and, simultaneously, (ii) selection information is encoded, the selection information indicating which one of a plurality of prediction parameters, each designating how to generate a prediction image, is selected for each of the plurality of prediction units, the image decoding device comprising:

classification means for (i) dividing a prediction image into a plurality of unit regions and (ii) classifying a plurality of prediction units included in each of the plurality of unit regions into a first group and a second group;

prediction parameter decoding means for decoding (i) a first prediction parameter designating, for each of a plurality of prediction units belonging to the first group, how to generate a prediction image, and (ii) a second prediction parameter designating, for each of a plurality of prediction units belonging to the second group, how to generate a prediction image,

the first prediction parameter specifying one of predetermined prediction parameters included in a basic set,

the second prediction parameter specifying one of prediction parameter(s) included in a reduced set,

the reduced set including (i) at least one of a DC prediction mode, a horizontal direction prediction mode, and a vertical direction prediction mode, and (ii) at least one of values of first prediction parameters for prediction units belonging to a corresponding one of the plurality of unit regions.

24. The image decoding device as set forth in claim 23, wherein:

a value obtained by subtracting 1 from the number of prediction parameters included in the reduced set is a power of 2.

25. The image decoding device as set forth in claim 23, wherein:

each of the prediction parameters designates a prediction mode used in intra prediction.

26. An image encoding device for encoding a difference between an input image and a prediction image, comprising:

classification means for (i) dividing a prediction image into a plurality of unit regions and (ii) classifying a plurality of prediction units included in each of the plurality of unit regions into a first group and a second group;

prediction parameter determination means for determining (i) a first prediction parameter designating, for each of a plurality of prediction units belonging to the first group, how to generate a prediction image, and (ii) a second prediction parameter designating, for each of a plurality of prediction units belonging to the second group, how to generate a prediction image,

the first prediction parameter specifying one of predetermined prediction parameters included in a basic set,

the second prediction parameter specifying one of prediction parameter(s) included in a reduced set,

the reduced set including (i) at least one of a DC prediction mode, a horizontal direction prediction mode, and a vertical direction prediction mode, and (ii) at least one of values of first prediction parameters for prediction units belonging to a corresponding one of the plurality of unit regions.