Abstract: An apparatus and a method for correcting colors of an image projection device are provided. The method includes: acquiring a photographed image by photographing a sample image projected on projection surface; generating input-output color information for n regions, based on color values of a block in the sample image and corresponding color values of the block in the photographed image; selecting one of the n regions of photographed images as a reference region; generating look-up tables (LUTs) for non-reference regions, based on the reference region and the input and output color information; and correcting colors of input images to be projected by the image projection device using the look-up tables, thereby minimizing color difference of the input images on the projection surface for both intra and inter projection device color correction while simplifying the correction procedure.

Abstract: Rate adaptation is carried out using bit error rate (BER) to enable effective multimedia transmission. The BER can be estimated using signal strength in a MAC layer and modulation information (FIGS. 7-9), and can be compatibly used in different wireless networks by means of message standardization.

Abstract: The present invention proposes a method and apparatus for correcting a motion of panorama video captured by a plurality of cameras. The method of the present invention includes performing global motion estimation for estimating smooth motion trajectories from the panorama video, performing global motion correction for correcting a motion in each frame of the estimated smooth motion trajectories, performing local motion correction for correcting a motion of each of the plurality of cameras for the results in which the motions have been corrected, and performing warping on the results on which the local motion correction has been performed.

Abstract: A method of receiving content in a client is provided. The method may include receiving, from a server, a spatial set identifier (ID) corresponding to a tile group including at least one tile, sending, to the server, a request for first content corresponding to metadata, and receiving, from the server, the first content corresponding to the request.

Abstract: The present specification is related to a method for performing multi-projection and a multi-projection system for minimizing a black offset in a multi-projection environment. The present specification provides the method for performing multi-projection comprising estimating the intensity transfer function (ITF) of a plurality of projectors, calculating an optimal black offset threshold for each of the projectors by using each of the ITFs, and applying the optimal black offset threshold to an image projection by each of the projectors.

Abstract: Disclosed are a color correction apparatus for panorama video stitching and a method of selecting a reference image using the same. A method of selecting a reference image for color correction when stitching panorama video based on input images includes selecting an optimum reference image candidate from the input images based on standard deviations for overlapping regions between the input images, performing color correction on the input images based on the optimum reference image candidate, and validating the optimum reference image candidate based on the color-corrected input images.

Abstract: Provided are a method of tuning a coding rate and applying an unequal error protection for an adaptive video transmission, and a video transmission/reception apparatus using the method. The video transmission apparatus may include: a coding rate tuner to predict, as a channel capacity of a subsequent channel interval, an estimated channel capacity value fed back from the video reception apparatus, and to tune video and channel coding rates within the predicted channel capacity; a video encoder to perform video encoding of video frames at the tuned video coding rate, and to generate a video packet; and a forward error correction (FEC) encoder to apply the unequal error protection based on a length of the video packet and a type of the video frames included in the video packet, and to perform channel encoding of the video packet at the tuned channel coding rate to generate a bitstream.

Abstract: The invention relates to method for estimating wireless channel status in wireless network, which is to be performed by client device connected to server for transmitting a video packet stream through a wired/wireless network, comprising: a step of estimating a bit error rate using additional information on a received video packet; and a step of estimating the channel capacity of the wireless network using the estimated bit error rate. The server receives, from the client device, feedback on the estimated channel capacity information or channel condition information of the wireless network, and adjusts the optimal video coding rate or the optimal source coding rate in a wireless network. Accordingly, the deterioration in the video quality of the video stream being received in the client device in real-time may be prevented to thereby improve the quality of service (QoS) of the video being received through a wireless network.

Abstract: A digital broadcasting system provides a method and device for packetizing a video stream. The packetizing device includes: a video frame check block for classifying an encoded video stream according to the frame type; a header setting block for setting a packet header for each of the classified frames; and a packetizing block for packetizing a video frame on the basis of the set packet header. The frame type may be one of an intra-coded (I) frame, a predicted (P) frame, and a bi-predictive (B) frame. Since a digital broadcasting stream is efficiently packetized, overhead due to a typical synchronization packet may be reduced, and accordingly, bandwidth may be efficiently used.

Abstract: There is provided a channel capacity estimation method for adaptive video transmission, the method including: estimating a Bit Error Rate (BER) for a received video packet; and estimating channel capacity by using the estimated BER.

Abstract: A video communication apparatus in which eye contact can be made with an opposite party of a conversation is provided. The video communication apparatus includes: a monitor unit for video communication; and a camera unit for capturing an image of a user, wherein the monitor unit repeats mode switching between a video mode and a transparent mode according to a specific period, and wherein the camera unit is located behind the monitor unit and captures the image of the user by using a screen of the monitor unit. Accordingly, eye contact can be made with the opposite party when users who participate in video communication talk to each other while seeing communication images.

Abstract: A method for providing a broadcasting service containing contents includes: generating contents representations metadata for describing possible representations of the contents; and outputting the contents representations metadata, wherein the contents representations metadata includes one or more contents representations description elements which describe a metadata tool defined by a standard specification.

Abstract: Provided are an extended multimedia file structure, a multimedia file producing method, and a multimedia file executing method. The extended multimedia file structure includes: a metadata section including a media initial object descriptor (IOD) field and at least one track pointer; and a media data section including at least one media block indicated by the track pointer, wherein the at least one track pointer indicates a detail media resource contained in an embedded multimedia file or an external multimedia file.

Abstract: A method of sharing data of a scalable video coding (SVC) file and the SVC file are provided. The SVC file includes: a scalable base track including at least one scalable layer entry each storing metadata of the at least one scalable layer; and at least one sub track generated based on the scalable base track, which includes identification information of the scalable layer that is a basis of generation of a sub track among the scalable layers and identification information of the scalable base track instead of the scalable layer entry. Accordingly, when an SVC coded content is stored as a file, it is possible to reduce a storage capacity by avoiding duplication of common data and to provide convenience when the stored content is reprocessed by allowing a relation of tracks correlated to one another to be represented.

Abstract: Provided are a method of tuning a coding rate and applying an unequal error protection for an adaptive video transmission, and a video transmission/reception apparatus using the method. The video transmission apparatus may include: a coding rate tuner to predict, as a channel capacity of a subsequent channel interval, an estimated channel capacity value fed back from the video reception apparatus, and to tune video and channel coding rates within the predicted channel capacity; a video encoder to perform video encoding of video frames at the tuned video coding rate, and to generate a video packet; and a forward error correction (FEC) encoder to apply the unequal error protection based on a length of the video packet and a type of the video frames included in the video packet, and to perform channel encoding of the video packet at the tuned channel coding rate to generate a bitstream.

Abstract: A method of sharing data of a scalable video coding (SVC) file and the SVC file are provided. The SVC file includes: a scalable base track including at least one scalable layer entry each storing metadata of the at least one scalable layer; and at least one sub track generated based on the scalable base track, which includes identification information of the scalable layer that is a basis of generation of a sub track among the scalable layers and identification information of the scalable base track instead of the scalable layer entry. Accordingly, when an SVC coded content is stored as a file, it is possible to reduce a storage capacity by avoiding duplication of common data and to provide convenience when the stored content is reprocessed by allowing a relation of tracks correlated to one another to be represented.

Abstract: There is provided a channel capacity estimation method for adaptive video transmission, the method including: estimating a Bit Error Rate (BER) for a received video packet; and estimating channel capacity by using the estimated BER.

Abstract: Methods of coding a bitstream in which the frames are encoded for enabling a spatial resolution is changed in real time, extracting the bitstream by adding a signaling message indicating that the spatial resolution is changed, and decoding the bitstream in which the spatial resolution is changed in real time after actively detects whether the spatial resolution is changed without additional information, and a codec using the methods are provided. Therefore, if the network has the restricted environment that the resolution is changed in real time while a video encoding and decoding or if there is a need to output the video whose the spatial resolution is partly changed in the decoder, the present invention provides methods to actively cope with the spatial resolution change of the video so as to efficiently watch the video.

Abstract: In the conventional content, a minimum access unit of the random access information is one frame unit. In the case of SVC video content, one frame consists of a plurality of scalable layers. The SVC data can be used for each salable layer only when the data is accessible for each scalable layer. The present invention provides a method and apparatus for transmitting and receiving an SVC file for each scalable layer wherein the SVC file can be accessed for each scalable layer by allowing metadata to contain a layer descriptor in a network abstraction layer unit (NALU) or in a byte unit.

Abstract: Provided are an extended multimedia file structure, a multimedia file producing method, and a multimedia file executing method. The extended multimedia file structure includes: a metadata section including a media initial object descriptor (IOD) field and at least one track pointer; and a media data section including at least one media block indicated by the track pointer, wherein the at least one track pointer indicates a detail media resource contained in an embedded multimedia file or an external multimedia file.