Patent ID: 7933336
Filing Date: 2011-04-26
Classification: H04N

Abstract:
1. 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) determine 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, wherein the block mode in step (a) is determined, at least in part, by the use of an SAD comparison method for macro blocks, when the first macro block includes some intra blocks.