Image down-sampling transcoding method and device
AssigneeHumax Co., Ltd.
InventorsYung-Lyul Lee, Euee-S. Jang, Chung-Ku Lee
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Abstract
In an image down-sampling transcoding method, by reducing an MPEG SP (simple profile) video bit stream having a CIF (Common Intermediate Format) size into a half in image size in a pixel domain, the video bit stream is converted into a H.264 BP (Baseline Profile) video stream having a QCIF (Quarter CIF) size. Accordingly, it is possible to down-sample an image from MPEG-4 to H.264 at a high speed.
Claims16
An image down-sampling transcoding method for converting a first image having a first format into a second image having a second format, the image down-sampling transcoding method comprising:
- (a) decoding a bit stream encoded in the first format;
- (b) down-sampling a macro block of a predetermined unit in the decoded first image by the use of a predetermined filtering method;
- (c) calculating a calculation value corresponding to the down-sampled macro block of the first image by the use of predetermined calculation method for predetermined candidate block modes in the second format;
- and
- (d) performing an encoding process with the candidate block mode having the least calculation value.
An image down-sampling transcoding device for converting a first image having a first format into a second image having a second format, the image down-sampling transcoding device comprising:
- a decoding unit decoding a bit stream encoded in the first format;
- a down-sampling unit down-sampling a macro block of a predetermined unit in the decoded first image by the use of a predetermined filtering method;
- a calculation unit calculating a calculation value corresponding to the down-sampled macro block of the first image by the use of predetermined calculation methods for predetermined candidate block modes in the second format;
- and
- an encoding unit performing an encoding process in the second format with the candidate block mode having the least calculation value.
Dependencies are inferred from the claim text.