CODING APPARATUS AND CODING METHOD

• US 20100061462A1
• Filed: 09/01/2009
• Published: 03/11/2010
• Est. Priority Date: 09/09/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: ICHIKI, Atsushi
• Granted Patent: US 8,582,653 B2
• Time in Patent Office: Days
• US Class Current: 375/240.160
• CPC Class Codes: H04N 19/119 Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/55 Motion estimation with spatial constraints, e.g. at image or region borders
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

A coding apparatus includes a window information acquiring unit acquiring window information indicating an arrangement of windows on a screen that includes a plurality of windows, an identifying unit identifying macroblocks that include a border between overlapping windows from the window information and macroblock information indicating an arrangement of macroblocks into which the screen is partitioned, a classifying unit partitioning the identified macroblocks into sub-blocks so as to conform to the border and classifying the sub-blocks into which the macroblocks are partitioned into groups, and a coding unit coding the sub-blocks classified into the groups by applying the result of the motion vector prediction to the other sub-blocks classified in the same group.

Claims

1. A coding apparatus, comprising:

a window information acquiring unit acquiring window information indicating an arrangement of windows on a screen that includes a plurality of windows;

an identifying unit identifying one or more macroblocks that include a border between overlapping windows from the window information and macroblock information indicating an arrangement of macroblocks into which the screen is partitioned;

a classifying unit partitioning each of the identified one or more macroblocks into sub-blocks so as to conform to the border and classifying the sub-blocks into which the one or more macroblocks are partitioned into groups based on whether or not the sub-blocks include the border; and

a coding unit coding the sub-blocks classified into the groups by performing motion vector prediction using a certain sub-block in a group for sub-blocks classified in the same group and applying a result of the motion vector prediction of the certain sub-block to the other sub-blocks classified in the same group as the certain sub-block.

2. The coding apparatus according to claim 1, wherein the window information includes a position and a size of each of the plurality of windows on the screen.

3. The coding apparatus according to claim 1, wherein the window information includes information indicating whether an overlapping window is in the foreground or behind a window.

4. A coding method, comprising:

acquiring window information indicating an arrangement of windows on a screen that includes a plurality of windows;

reading, from a storage device, macroblock information indicating an arrangement of macroblocks into which the screen is partitioned;

identifying one or more macroblocks that include a border between overlapping windows based on the window information and the macroblock information;

partitioning the identified one or more macroblocks that include the border between the overlapping windows into sub-blocks so as to conform to the border;

classifying the plurality of sub-blocks into which the one or more macroblocks are partitioned into groups based on whether or not the sub-blocks include the border; and

coding the classified sub-blocks by performing motion vector prediction using a certain sub-block in a group for sub-blocks classified in the same group and applying a result of the motion vector prediction of the certain sub-block to the other sub-blocks classified in the same group as the certain sub-block.

5. The coding method according to claim 4, wherein the window information includes a position and a size of each of the plurality of windows on the screen.

6. The coding method according to claim 4, wherein the window information includes information indicating whether an overlapping window is in the foreground or behind a window.

7. A computer-readable medium encoded with a computer program, the program when executed by a computer causes the computer to perform a coding method comprising:

acquiring window information indicating an arrangement of windows on a screen that includes a plurality of windows;

reading, from a storage device, macroblock information indicating an arrangement of macroblocks into which the screen is partitioned;

identifying one or more macroblocks that include a border between overlapping windows based on the window information and the macroblock information;

partitioning the identified one or more macroblocks that include the border between the overlapping windows into sub-blocks so as to conform to the border;

classifying the plurality of sub-blocks into which the one or more macroblocks are partitioned into groups based on whether or not the sub-blocks include the border; and

coding the classified sub-blocks by performing motion vector prediction using a certain sub-block in a group for sub-blocks classified in the same group and applying a result of the motion vector prediction of the certain sub-block to the other sub-blocks classified in the same group as the certain sub-block.