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US 8,135,064 B2Granted
Intra prediction apparatus
AssigneePanasonic Corporation
InventorsKei Tasaka, Hiroshi Arakawa, Takashi Masuno, Koji Arimura, Tatsuro Juri
Life of this patent
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Abstract
An intra prediction apparatus includes: a candidate narrowing-down unit which narrows down, from a plurality of intra prediction directions, an intra prediction direction candidate which is applied to a block of multiple pixels that constitutes a video in accordance with a characteristic of the video; and an intra prediction execution unit which executes intra prediction in the intra prediction direction narrowed down by said candidate narrowing-down unit. Through this, computational load can be lightened while contributing to improvement in picture quality and encoding efficiency.
Claims24
An intra prediction apparatus comprising:
- an acquiring unit configured to acquire information identifying a display form of a plurality of pixels that makes up input video data, the display form being used for displaying the plurality of pixels as a picture;
- a candidate narrowing-down unit configured to narrow down, from a plurality of intra prediction directions, intra prediction direction candidates based on the information acquired by the acquiring unit, the intra prediction direction candidates being applied to a block composed of the plurality of pixels;
- and
- an intra prediction execution unit configured to execute intra prediction on the block using the intra prediction direction candidates narrowed down by said candidate narrowing-down unit,
- wherein a combination of the intra prediction direction candidates narrowed down by said candidate narrowing-down unit changes depending on horizontal and vertical distribution of the plurality of pixels as indicated by the information acquired by the acquiring unit,
- (a) a majority of the intra prediction directions included in the narrowed-down intra prediction direction candidates each have more vertically oriented components than horizontally oriented components when a comparison between the vertical distribution and the horizontal distribution of the plurality of pixels shows that density of the vertical distribution is higher than density of the horizontal distribution, and
- (b) a majority of the intra prediction directions included in the narrowed-down intra prediction direction candidates each have more horizontally oriented components than vertically oriented components when a comparison between the vertical distribution and the horizontal distribution of the plurality of pixels shows that density of the horizontal distribution is higher than density of the vertical distribution.
4 more elements
An intra prediction method comprising steps of:
- acquiring information identifying a display form of a plurality of pixels that makes up input video data, the display form being used for displaying the plurality of pixels as a picture;
- narrowing down, from a plurality of intra prediction directions, intra prediction direction candidates based on the acquired information, intra prediction direction candidates being applied to a block composed of the plurality of pixels;
- and
- executing via a computer intra prediction on the block using the intra prediction direction candidates narrowed down by said narrowing-down step,
- wherein a combination of the intra prediction direction candidates narrowed down by said candidate narrowing-down step changes depending on horizontal and vertical distribution of the plurality of pixels as indicated by the information acquired in the acquiring step,
- (a) a majority of the intra prediction directions included in the narrowed-down intra prediction direction candidates each have more vertically oriented components than horizontally oriented components when a comparison between the vertical distribution and the horizontal distribution of the plurality of pixels shows that density of the vertical distribution is higher than density of the horizontal distribution, and
- (b) a majority of the intra prediction directions included in the narrowed-down intra prediction direction candidates each have more horizontally oriented components than vertically oriented components when a comparison between the vertical distribution and the horizontal distribution of the plurality of pixels shows that density of the horizontal distribution is higher than density of the vertical distribution.
4 more elements
A computer program embodied on a non-transitory computer readable medium for causing a computer to execute intra prediction, said computer program comprising:
- computer executable program code configured to cause the computer to acquire information identifying a display form of a plurality of pixels that makes up input video data, the display form being used for displaying the plurality of pixels as a picture;
- computer executable program code configured to cause the computer to narrow down, from a plurality of intra prediction directions, intra prediction direction candidates based on the acquired information, the intra prediction direction candidates being applied to a block composed of the plurality of pixels;
- and
- computer executable program code configured to cause the computer to execute intra prediction on the block using the narrowed down intra prediction direction candidates,
- wherein a combination of the narrowed down intra prediction direction candidates changes depending on horizontal and vertical distribution of the plurality of pixels as indicated by the acquired information,
- (a) a majority of the intra prediction directions included in the narrowed-down intra prediction direction candidates each have more vertically oriented components than horizontally oriented components when a comparison between the vertical distribution and the horizontal distribution of the plurality of pixels shows that density of the vertical distribution is higher than density of the horizontal distribution, and
- (b) a majority of the intra prediction directions included in the narrowed-down intra prediction direction candidates each have more horizontally oriented components than vertically oriented components when a comparison between the vertical distribution and the horizontal distribution of the plurality of pixels shows that density of the horizontal distribution is higher than density of the vertical distribution.
4 more elements
Dependencies are inferred from the claim text.