Abstract: A spatial prediction method for coding a residual image in layered video coding. The spatial prediction method includes selecting at least one of a default mode, a horizontal mode and a vertical mode as a spatial prediction mode, taking into account an activity of at least one adjacent block located adjacent to a first block among blocks included in the residual image; and coding differences between pixels of the first block and pixels of a prediction bock constructed by one of the selected at least one or more spatial prediction modes. The at least one adjacent block includes a first adjacent block located on the left of the first block and a second adjacent block located on the top of the first block.

Abstract: A method, medium, and apparatus for encoding and/or decoding video by generating a scalable bitstream formed with a base layer bitstream and an enhancement layer bitstream, in order to provide forward compatibility, is described.

Abstract: Provided are a scalable video encoding apparatus, a scalable video decoding apparatus, and method. The scalable video encoding apparatus includes a first encoding unit to generate a base layer bitstream, which is to be used for generating a reconstructed image having a second resolution, by encoding an original image having a first resolution into an encoded image having the second resolution, and a second encoding unit to generate an enhancement layer bitstream by reconstructing the reconstructed image having the second resolution, which is received from the first encoding unit, to be a reconstructed image having the first resolution in response to an interpolation mode signal, and then to encode the original image having the first resolution by using the reconstructed image having the first resolution, where the enhancement layer bitstream contains additional information for generating a reconstructed image having the first resolution or a third resolution.

Abstract: A method and apparatus for enabling a cloud server to provide screen information data indicating a screen to be displayed on a client device are provided. The method of enabling a cloud server to provide screen information data relating to a screen to be displayed on a client device includes: generating the screen information data; determining whether or not to protect the generated screen information data based on characteristics of an object configuring the screen; encrypting the provided screen information data based on the determining; and transmitting the encrypted the screen information data to the client device.

Abstract: Provided are a scalable video coding method and apparatus, and a scalable video decoding method and apparatus. The coding method generates a base layer bitstream of video by using one of a plurality of codecs, determines whether the used codec supports enhancement layer coding, decodes the base layer bitstream according to the result of the determination in order to extract coded information used for the generation of the base layer bitstream, and generates an enhancement layer bitstream of the original video based on the extracted information. Accordingly, it is possible to provide high-quality video and increase coding efficiency while using the various existing codecs.

Abstract: Provided is a multilayer picture encoding/decoding apparatus and method for reducing a dynamic range of residual pictures occurring in enhancement layers. The multilayer picture encoding method includes performing format down-conversion on an input picture, and generating a lower layer bitstream by encoding the format down-converted input picture; performing format up-conversion by adaptively or selectively applying a 1-dimensional (1-D) prediction filter to a picture of the lower layer depending on whether a lower layer prediction flag is set or not; and calculating a residual picture between the input picture and the format up-converted picture, and generating an enhancement bitstream by encoding the calculated residual picture.

Abstract: Provided are an apparatus for encoding an image and an apparatus for decoding an image. The apparatus for encoding the image includes a grouping unit to group transform coefficients according to layers and generate groups, a pattern encoding unit to generate and encode the pattern information of each group by using the quantized transform coefficients existing in the groups of each layer in an order from an upper layer to a lower layer, and a level encoding unit to encode levels of the quantized transform coefficients corresponding to the pattern information of the groups of each layer and generate bitstreams along with the pattern information of the groups of each layer.

Abstract: A method, medium, and apparatus for encoding and/or decoding video by generating a scalable bitstream formed with a base layer bitstream and an enhancement layer bitstream in order to provide forward compatibility, the scalable bitstream comprising a base layer bitstream including a base quantized level and a base quantization parameter corresponding to a base bit-depth, and an enhancement layer bitstream including a residue between an extended quantized level and a compensated quantized level that is predicted from the base quantized level, and additional quantization information for refining the difference between an extended bit-depth and the base bit-depth, wherein a process for improving image quality is applied to at least one of the base layer and the enhancement layer.

Abstract: Provided are a resolution varying video encoding/decoding apparatus and method are provided. The video encoding apparatus comprises a resolution varying encoder to perform an encoding operation using motion estimation and compensation on a current image having a first resolution and a current image having a second resolution according to a resolution control signal to generate a bitstream, and a controller to generate the resolution control signal for varying a resolution to the first resolution or the second resolution at a predetermined interval.

Abstract: A field picture coding/decoding apparatus and method is provided. The field picture coding method includes selecting a reference field with respect to an input image, generating a predictive image by deinterlacing with respect to the selected reference field, and performing predictive coding with respect to the input image using the predictive image.

Abstract: A video encoding apparatus and method and a video decoding apparatus and method are provided. The video encoding apparatus includes a base layer encoding unit generating a base layer bitstream including a quantization level of video data and a base quantization parameter corresponding to a base bit-depth, an enhancement layer encoding unit generating an enhancement layer bitstream including a refined quantization parameter for refining the difference between an extended bit-depth and the base bit-depth, and a bitstream combining unit combining the base layer bitstream and the enhancement layer bitstream to generate the scalable bitstream.

Abstract: A method of and apparatus to efficiently encode and/or decode an image are provided. The method of encoding an image includes: calculating a motion vector of a main reference image by estimating a motion of a current image with reference to the main reference image; deriving a motion vector of at least one auxiliary reference image from this motion vector; generating a prediction image of the current image by using a motion vector of the main reference image or the motion vector of the at least one auxiliary reference image; and encoding a residue image between the current image and the prediction image.

Abstract: Methods for scalable video encoding and decoding for a multi-view video and apparatuses for scalable video encoding and decoding which implement the methods are provided. At least one root image and other remaining images of an image sequence of a video are classified into a plurality of layers. At least one reference image relating to a current image of the image sequence is generated by using a parent image of the current image based on a reference image conversion technique for scalable prediction encoding. Prediction encoding may be performed with respect to the current image by using the at least one reference image.

Abstract: Provided are a scalable video encoding apparatus, a scalable video decoding apparatus, and method. The scalable video encoding apparatus includes a first encoding unit to generate a base layer bitstream, which is to be used for generating a reconstructed image having a second resolution, by encoding an original image having a first resolution into an encoded image having the second resolution, and a second encoding unit to generate an enhancement layer bitstream by reconstructing the reconstructed image having the second resolution, which is received from the first encoding unit, to be a reconstructed image having the first resolution in response to an interpolation mode signal, and then to encode the original image having the first resolution by using the reconstructed image having the first resolution, where the enhancement layer bitstream contains additional information for generating a reconstructed image having the first resolution or a third resolution.

Abstract: A method and apparatus for encoding and decoding video for brightness value compensation of multi-view video by using an offset value, which is a difference between an average value of pixels of the current block and an average value of pixels of the reference block, to the prediction block to compensate for an illumination value of the prediction block

Abstract: Provided are a scalable video coding method and apparatus, and a scalable video decoding method and apparatus. The coding method generates a base layer bitstream of video by using one of a plurality of codecs, determines whether the used codec supports enhancement layer coding, decodes the base layer bitstream according to the result of the determination in order to extract coded information used for the generation of the base layer bitstream, and generates an enhancement layer bitstream of the original video based on the extracted information. Accordingly, it is possible to provide high-quality video and increase coding efficiency while using the various existing codecs.

Abstract: A method, medium, and system encoding and/or decoding a moving picture. The moving picture encoding method may include selecting a prediction mode that is optimal for the macro blocks, which correspond to each other, of the color components of a current image based on the characteristics of a predetermined image, generating a predicted image for the current image according to the selected prediction mode, and encoding a moving picture using the predicted image. An optimal prediction mode can be adaptively applied to the macro blocks, which correspond to each other, of the color components, thereby increasing the moving picture's encoding and decoding efficiencies.

Abstract: Provided are a scalable video encoding apparatus, a scalable video decoding apparatus, and method. The scalable video encoding apparatus includes a first encoding unit to generate a base layer bitstream, which is to be used for generating a reconstructed image having a second resolution, by encoding an original image having a first resolution into an encoded image having the second resolution, and a second encoding unit to generate an enhancement layer bitstream by reconstructing the reconstructed image having the second resolution, which is received from the first encoding unit, to be a reconstructed image having the first resolution in response to an interpolation mode signal, and then to encode the original image having the first resolution by using the reconstructed image having the first resolution, where the enhancement layer bitstream contains additional information for generating a reconstructed image having the first resolution or a third resolution.

Abstract: Provided are a scalable video coding method and apparatus, and a scalable video decoding method and apparatus. The coding method generates a base layer bitstream of video by using one of a plurality of codecs, determines whether the used codec supports enhancement layer coding, decodes the base layer bitstream according to the result of the determination in order to extract coded information used for the generation of the base layer bitstream, and generates an enhancement layer bitstream of the original video based on the extracted information. Accordingly, it is possible to provide high-quality video and increase coding efficiency while using the various existing codecs.

Abstract: Provided is a multilayer picture encoding/decoding apparatus and method for reducing a dynamic range of residual pictures occurring in enhancement layers. The multilayer picture encoding method includes performing format down-conversion on an input picture, and generating a lower layer bitstream by encoding the format down-converted input picture; performing format up-conversion by adaptively or selectively applying a 1-dimensional (1-D) prediction filter to a picture of the lower layer depending on whether a lower layer prediction flag is set or not; and calculating a residual picture between the input picture and the format up-converted picture, and generating an enhancement bitstream by encoding the calculated residual picture.