• Journal of Broadcast Engineering
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• v.25 no.5
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• pp.709-722
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• 2020

Point Cloud which is a cluster of numerous points can express 3D object beyond the 2D plane. Each point contains 3D coordinate and color data basically, reflectance or etc. additionally. Point Cloud demand research and development much higher effective compression technology. Video-based Point Cloud Compression (V-PCC) technology in development and standardization based on the established video codec. Despite its high effective compression technology, point cloud service will be limited by terminal spec and network conditions. 2D video had the same problems. To remedy this kind of problem, 2D video is using Scalable High efficiency Video Coding (SHVC), Dynamic Adaptive Streaming over HTTP (DASH) or diverse technology. This paper proposed a density scalability method using SHVC codec in V-PCC.

• Journal of Broadcast Engineering
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• v.2 no.1
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• pp.24-35
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• 1997

Basic and transmission video quality testing was performed in real-time mode using hardware video codec based on MPEG-2 MP@ML standard including subsequent transmitting and receiving satellite simulator unit. The double-stimulus Impairment scale method and the double-stimulus continous quality scale method based on CCIR 500-5 were used as an evaluation method. The whole digital broadcasting satellite system consisting of MPEG-2 codec, system mux/demux, channel codec, channel, modem, antenna, etc. was put into the overall video quality testbed and the basic and transmission error quality assessment was performed at various bitrates and BER for an integrated system performance evaluation. In transmission error video quality testing, transmission error video quality maintained on average above 3.9 point on the 5-point scale. The low-bit rate quality such as film mode(@2Mbps) highly depended on the statitical characteristics of video source and maintained on average around 2.7 point.

• Broadcasting and Media Magazine
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• v.7 no.3
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• pp.75-82
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• 2002

In this report, the complexity analysis of the JVT(Joint Video Team) codec, which has jointly developed the next video coding standard, is performed. Three types of configurations in terms of coding efficiency are set and the analysis of the memory band width and computation time for each configuration is performed. ATOMIUM complexity analysis tool is used for both the memory access statistics and computation time calculation of JVT codec. Also the complexity of each video coding tool in the encoder and decoder is shown in relative complexity.

• Journal of Korea Society of Digital Industry and Information Management
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• v.4 no.1
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• pp.41-46
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• 2008

With widespread use of the Internet and improvements in streaming media and compression technology, digital music, video, and image can be distributed instantaneously across the Internet to end-users. However, most conventional Digital Right Management are often not secure and fast enough to process the vast amount of data generated by the multimedia applications to meet the real-time constraints. In this paper, we propose the copyright protection using encryption of DCT coefficients and motion vector in MPEG-4 video codec of mobile device. This paper presents a new Digital Rights Management that modifies the Motion Vector of Macroblock for mobile device. Experimental results indicate that the proposed DRM can not only achieve very low cost of the encryption but also enable separable authentication to individual mobile devices such as Portable Multimedia Player and Personal Digital Assistants. The performance of the proposed methods have low complexity and low increase of bit rate in overhead.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1998.06b
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• pp.177-182
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• 1998

In this paper, we propose a lossless motion video coding method using motion compensation. For realtime coding and transmission, we developed a lossless video codec based on the proposed method. It was confirmed the codec functions normally in an experiment involving coding and transmitting through an actual ATM network. Furthermore, we proposed a lossless coding method with bit-plane expansion under a constant bitrate. Two approaches, a closed bit-plane approach and a merged bit-plane approach, are considered and characteristics of their compression efficiency are estimated. Simulation results show that the proposed method is suitable for lossless video coding with bitrate control.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1288-1291
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• 2002

In this paper, we present a design of mpeg-4 video codec chip to reduce the power consumption using frame level clock gating and motion estimation skip scheme. It performs 30 grames/s of codec (encoding and decoding) mode with quarter-common intermediate format(QCIF) at 27MHz. A novel low-power techniques were implemented in architectural level, which is 35% of the power dissipation for a conventional CMOS design. This chip performs MPEG-4 Simple Profile Level 2(Simple@L2) and H.263 base mode. Its contains 388,885 gates, 662k bits memory, and the chip size was 9.7 mm x 9.7 mm which was fabricated using 0.35 micron 3-layers metal CMOS technology.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.811-814
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• 2000

It this paper a VLSI architecture of the Shape-Adaptive Discrete Cosine Transform (SA-DCT) is described, which can be employed dedicatedly for MPEG-4 video codec. Adopting a fast DCT algorithm, the number of multipliers can be reduced by half in comparison with a conventional algorithm. This SA-DCT core with a small additional amount of hardware can perform the SA-Inverse DCT (SA-IDCT) by sharing multipliers and a transportation memory. The proposed SA-DCT core is integrated with 40,000 gates by using 0.35$mu$m triple-metal CMOS technology, which operates at 20 Mhz, and hence enables the realtime codec of CIF ($352{\times}288$ pixels) pictures.

• Journal of Broadcast Engineering
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• v.13 no.1
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• pp.25-33
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• 2008

Video telephony is a representative service in 3G mobile network. And there have been efforts to improve quality of video telephony service in different fields. In Korea, the leading mobile service provider SKTelecom and KTF service the WCDMA network as 3G mobile network. Now, more than a million people is using the network. In this paper, we study about video telephony over WCDMA network. and propose error minimizing algorithm using cross-layer adaptation between physical layer and video codec. We simulated 3G-324M protocol with MPEG-4 video codec, and simulation results show suggested algorithm improve packet transmission rate for improving quality of video telephony service.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1983.10a
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• pp.77-80
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• 1983

90Mbps 디지털 비데오 코덱의 구성방법으로 서pel 당 비트수, sampling 주파수, 데이터 감축 방법등의 여러가지 설계 요건들이 SQNR, 하아드웨어 복잡성 정도에 따라 비교검토 되었으며 그 결과 HBL control을 포함하는 9bit PCM codec 방식이 90Mbps 전송속도에서 타당함이 밝혀졌다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.2
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• pp.111-116
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• 2012

In this paper, we fabricate a WiFi based video transmitting equipment and establish a video transmitting system for realtime transmitting of accident scene on expressways. The transmitting equipment is based on the H.264 video codec and embed WiFi module. The transmitting equipment can transmit video and also meta data such as location positioning through the Wibro network using a Wibro terminal. From test results, it is clear that high density videos were transmitted while the vehicle carried by the video equipment was traveling with velocity of 80 km/h.