US 2006/0133500 A1 · Image down-sampling transcoding method and device

Abstract

Provided are method and device for down-sampling an image from H.264 to MPEG-4 at a high speed. The image down-sampling transcoding method for converting a first macro block having a first format into a second macro block having a second format includes: (a) determining a block mode of the second macro block and converting the first macro block into the second macro block with the determined block mode, when the number of intra macro blocks included in the first macro block satisfies a first condition; (b) determining a block mode of the second macro block and converting the first macro block into the second macro block with the determined block mode, when the number for inter macro blocks included in the first macro block satisfies a second condition; and (c) re-adjusting a motion vector of the second macro block, after the conversion of the first macro block into the second macro block is finished.

Claims28

Dependent claims

An image down-sampling transcoding method for converting a first macro block having a first format into a second macro block having a second format, the image down-sampling transcoding method comprising:

(a) determining a block mode of the second macro block having a C×D size (where C and D are natural numbers) and converting the first macro block into the second macro block with the determined block mode, when the number of intra macro blocks included in the first macro block having a A×B size (where A and B are natural numbers) satisfies a first condition;
(b) determining a block mode of the second macro block and converting the first macro block into the second macro block with the determined block mode, when the number for inter macro blocks included in the first macro block satisfies a second condition;
and
(c) re-adjusting a motion vector of the second macro block, after the conversion of the first macro block into the second macro block is finished.

1 more element

An image down-sampling transcoding device for converting a first macro block having a first format into a second macro block having a second format, the image down-sampling transcoding device comprising:

a first conversion unit determining a block mode of the second macro block and converting the first macro block into the second macro block with the determined block mode, when the number of intra macro blocks included in the first macro block satisfies a first condition;
a second conversion unit determining a block mode of the second macro block and converting the first macro block into the second macro block with the determined block mode, when the number for inter macro blocks included in the first macro block satisfies a second condition;
and
a motion vector re-adjusting unit re-adjusting a motion vector of the second macro block, after the conversion of the first macro block into the second macro block is finished.

1 more element

a conversion unit determining any one of candidate block modes having the second format, which is determined in accordance with a predetermined condition by types of macro blocks included in the first macro block having a predetermined size, as a block mode of the second macro block and converting the first macro block into the second macro block with the determined block mode;
and
a motion vector re-adjusting unit re-adjusting a motion vector of the second macro block, after the conversion of the first macro block into the second macro block is finished.

Dependencies are inferred from the claim text.

Image down-sampling transcoding method and device

Life of this patent

Image down-sampling transcoding method and device

Life of this patent

Abstract

Claims28