Patent application number | Description | Published |
20090232217 | METHOD AND APPARATUS FOR ENCODING AND DECODING IMAGE - Provided are a method and apparatus for encoding an image, which can variably encode a residual of a current block that is predicted with a skip mode according to prediction modes of neighboring blocks, and a method and apparatus for decoding the encoded image. When both the prediction mode of the current block and the prediction modes of the neighboring blocks are skip modes, since the method of encoding the image also encodes the residual of the current block that is predicted with the skip mode, more bits can be assigned to the current block with a high probability of acting as a reference block for other blocks. | 09-17-2009 |
20090279606 | METHOD AND APPARATUS FOR ENCODING AND DECODING AN IMAGE BASED ON PLURALITY OF REFERENCE PICTURES - A method and apparatus for encoding and decoding an image using a plurality of reference pictures. In an exemplary embodiment, the method of encoding an image comprises: generating information about transforms between a first picture and a second picture; generating a reference picture by transforming the second picture based on the generated information about transforms; predicting a current block of a current picture based on at least one of the reference picture and the first picture; and encoding the current block based on the predicting. Therefore, prediction encoding based on more accurate prediction is possible, thereby increasing a compression ratio of image encoding. | 11-12-2009 |
20090285300 | METHOD AND APPARATUS FOR ENCODING AND DECODING AN IMAGE USING A REFERENCE PICTURE - A method and apparatus for encoding and decoding an image by performing motion prediction and compensation on pictures in a group of pictures by selectively using a high-quality key picture that is previously encoded and restored, and a second picture that is previously encoded and restored. The method of encoding an image improves the prediction efficiency of an image by storing a key picture, which is encoded and restored to a high quality by reducing a loss caused by a quantization error using a small quantization coefficient, in a first storage unit and storing a previously encoded and restored second picture in a second storage unit, and then performing motion prediction and compensation by selectively using the key picture stored in the first storage unit and the second picture stored in the second storage unit while encoding a next picture in a group of pictures. | 11-19-2009 |
20100329336 | METHOD AND APPARATUS FOR ENCODING AND DECODING BASED ON INTER PREDICTION USING IMAGE INPAINTING - Provided are a method and apparatus for encoding and decoding based on inter prediction. In the method of encoding based on inter prediction, image inpainting is performed by searching for at least one reference picture by using pixels that are adjacent to the boundary between a current block and a previously encoded region of a current picture and are included in the previously encoded region, and the current block is encoded based on a predicted block obtained as the result of performing image inpainting. Accordingly, it is possible to precisely generate a predicted block, thereby improving the compression rate of image encoding. | 12-30-2010 |
20120128260 | METHOD AND APPARATUS FOR ENCODING IMAGES AND METHOD AND APPARATUS FOR DECODING IMAGES - Provided are methods and apparatuses for encoding and decoding an image. The method of encoding an image includes: splitting a current picture into at least one maximum coding unit; determining a split structure of the at least one maximum coding unit and a prediction mode and partitions of each coding unit by encoding image data of the at least one maximum coding unit based on depths of deeper coding units; setting skip information and split information about a split of a coding unit of an upper depth including each coding unit, according to the each coding unit; and encoding the split information and skip information, which are set according to each coding unit. | 05-24-2012 |
20130128973 | METHOD AND APPARATUS FOR ENCODING AND DECODING AN IMAGE USING A REFERENCE PICTURE - A method and apparatus for encoding and decoding an image by performing motion prediction and compensation on pictures in a group of pictures by selectively using a high-quality key picture that is previously encoded and restored, and a second picture that is previously encoded and restored. The method of encoding an image improves the prediction efficiency of an image by storing a key picture, which is encoded and restored to a high quality by reducing a loss caused by a quantization error using a small quantization coefficient, in a first storage unit and storing a previously encoded and restored second picture in a second storage unit, and then performing motion prediction and compensation by selectively using the key picture stored in the first storage unit and the second picture stored in the second storage unit while encoding a next picture in a group of pictures. | 05-23-2013 |
20140254948 | METHOD AND APPARATUS FOR ENCODING IMAGES AND METHOD AND APPARATUS FOR DECODING IMAGES - An apparatus for decoding an image includes an encoding information extractor which extracts split information indicating whether to split a coding unit of an upper depth into coding units of deeper depths and skip information indicating whether a prediction mode of a current coding unit is a skip mode, from image data and a decoding unit which determines a split structure of a maximum coding unit, according to the split information so that the maximum coding unit is hierarchically split as a depth increases and determines whether the prediction mode of the current coding unit is the skip mode according to the skip information. | 09-11-2014 |
20150016508 | METHOD AND APPARATUS FOR ENCODING IMAGES AND METHOD AND APPARATUS FOR DECODING IMAGES - An apparatus for decoding an image includes an encoding information extractor which extracts split information indicating whether to split a coding unit of an upper depth into coding units of deeper depths and skip information indicating whether a prediction mode of a current coding unit is a skip mode, from image data and a decoding unit which determines a split structure of a maximum coding unit, according to the split information so that the maximum coding unit is hierarchically split as a depth increases and determines whether the prediction mode of the current coding unit is the skip mode according to the skip information. | 01-15-2015 |
20150043639 | METHOD AND DEVICE FOR CODING SCALABLE VIDEO ON BASIS OF CODING UNIT OF TREE STRUCTURE, AND METHOD AND DEVICE FOR DECODING SCALABLE VIDEO ON BASIS OF CODING UNIT OF TREE STRUCTURE - Provided are scalable video encoding and decoding methods and apparatuses. A scalable video encoding method includes: encoding a lower layer image according to coding units having a tree structure, the coding units hierarchically split from maximum coding units of an image; determining scalable coding modes for performing scalable encoding on a higher layer image based on the coding units having the tree structure by referring to the lower layer image; predicting and encoding the higher layer image by referring to encoding information of the lower layer image based on the determined scalable coding modes; and outputting coding modes, predicted values of the lower layer image, and the determined scalable coding modes of the higher layer image based on the determined scalable coding modes. | 02-12-2015 |