[발표] 2015개정 실과 교육과정 ‘가정생활’ 영역 개발 방향

Due to the increased popularity of augmented and virtual reality experiences, the interest in capturing the real world in multiple dimensions and in presenting it to users in an immersible fashion has never been higher. Distributing such representations enables users to freely navigate in multi-sensory 3D media experiences. Unfortunately, such representations require a large amount of data, not feasible for transmission on today’s networks. Efficient compression technologies well adopted in the content chain are in high demand and are key components to democratize augmented and virtual reality applications. Moving Picture Experts Group, as one of the main standardization groups dealing with multimedia, identified the trend and started recently the process of building an open standard for compactly representing 3D point clouds, which are the 3D equivalent of the very well-known 2D pixels. This paper introduces the main developments and technical aspects of this ongoing standardization effort.

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Emerging MPEG Standards for Point Cloud Compression

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وضعیت برونداد علمی دانشگاه علوم پزشکی کردستان براساس شاخصهای علم سنجی تا پایان سال 2011 میلادی

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Клініко-епідеміологічні особливості спалаху кору в м. Суми у 2014 році

We present a generic and real-time time-varying point cloud codec for 3D immersive video. This codec is suitable for mixed reality applications in which 3D point clouds are acquired at a fast rate. In this codec, intra frames are coded progressively in an octree subdivision. To further exploit inter-frame dependencies, we present an inter-prediction algorithm that partitions the octree voxel space in $N \times N \times N$ macroblocks ( $N=8,16,32$ ). The algorithm codes points in these blocks in the predictive frame as a rigid transform applied to the points in the intra-coded frame. The rigid transform is computed using the iterative closest point algorithm and compactly represented in a quaternion quantization scheme. To encode the color attributes, we defined a mapping of color per vertex attributes in the traversed octree to an image grid and use legacy image coding method based on JPEG. As a result, a generic compression framework suitable for real-time 3D tele-immersion is developed. This framework has been optimized to run in real time on commodity hardware for both the encoder and decoder. Objective evaluation shows that a higher rate-distortion performance is achieved compared with available point cloud codecs. A subjective study in a state-of-the-art mixed reality system shows that introduced prediction distortions are negligible compared with the original reconstructed point clouds. In addition, it shows the benefit of reconstructed point cloud video as a representation in the 3D virtual world. The codec is available as open source for integration in immersive and augmented communication applications and serves as a base reference software platform in JTC1/SC29/WG11 (MPEG) for the further development of standardized point-cloud compression solutions.

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Design, Implementation, and Evaluation of a Point Cloud Codec for Tele-Immersive Video

Synchronization between locations is an important factor for enabling remote shared experiences. Still, experimental data on what is the acceptable synchronization level is scarce. This paper discusses the synchronization requirements for watching online videos together - a popular set of services that recreate the shared experience of watching TV together by offering tools to communicate while watching. It studies the noticeability and annoyance of synchronization differences of the video being watched, as well as the impact on users' feelings of togetherness, both for voice chat and text chat. Results of an experiment with 36 participants show that when using voice chat, users notice synchronization differences sooner, are more annoyed and feel more together than when using text chat. However, users with high text chat activity notice synchronization differences similar to participants using voice chat.

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Rufael Mekuria

Papers

Emerging MPEG Standards for Point Cloud Compression

Design, Implementation, and Evaluation of a Point Cloud Codec for Tele-Immersive Video

Are we in sync?: synchronization requirements for watching online video together.

Use cases for point cloud compression (PCC)

Evaluation criteria for PCC (Point Cloud Compression)