• Title/Summary/Keyword: 2D Video

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Evaluation of 3-Dimensional Exoscopes in Brain Tumor Surgery

  • Yoon, Wan-Soo;Lho, Hyoung-Woo;Chung, Dong-Sup
    • Journal of Korean Neurosurgical Society
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    • v.64 no.2
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    • pp.289-296
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    • 2021
  • Objective : Though the operating microscope (OM) has been the standard optical system in neurosurgery, a new technology called three-dimensional (3D) exoscope has emerged as an alternative. Herein, two types of 3D exoscopes for brain tumor surgery are presented. In addition, the advantages and limitations compared with the OM are discussed. Methods : In the present study, 3D exoscope VOMS-100 or VITOM 3D was used in 11 patients with brain tumor who underwent surgical resection; the Kinevo 900 OM was used only in emergency. After completion of all surgeries, the participants were surveyed with a questionnaire regarding video image quality on the display monitor, handling of equipment, ergonomics, educational usefulness, 3D glasses, and expectation as a substitute for the OM. Results : Among 11 patients, nine patients underwent neurosurgical resection with only 3D exoscope; however, two patients required additional aid with the OM due to difficulty in hemostasis. Regarding video image quality, VITOM 3D was mostly equivalent to the OM, but VOMS-100 was not. However, both 3D exoscopes showed advantages in accessibility of instruments in the surgical field and occupied less space in the operating theater. Differences in ergonomics and educational usefulness between the exoscopes were not reported. Respondents did not experience discomfort in wearing 3D glasses and thought the exoscopes could be currently, and in the future, used as a substitute for the OM. Conclusion : Although many neurosurgeons are not familiar with 3D exoscopes, they have advantages compared with the OM and similar image quality. Exoscopes could be a substitute for OM in the future if some limitations are overcome.

A 2-D triangular mesh based motion compensation for very low bit rate video coding (초 저속 비트율을 갖는 영상 부호화를 위한 2차원 삼각형 그물 기반 움직임 보상 방법)

  • 김학수;이규원;박규태
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.10
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    • pp.2112-2122
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    • 1997
  • This paper presents a new video codec which is based on 2-D triangular mesh-based motion compensation and two step grid point motion estimation. With this approach the efficiency of compression and the quality of reconstructed images are improved. The compensation of motion for each triangular patch is performed by image warping using motion vectors at the grid points. The prediction error coding and the rate control meet MPEG-4 VM 3.0 specification. The experimental results show that the codec system proposed is simple in complexity and moreover, the quality of decoded images is improved.

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Design of a wide dynamic range and high-speed logarithmic amplifier (넓은 동작영역과 고속특성을 갖는 로그 증폭기의 설계)

  • Park, Ki-Won;Song, Min-Kyu
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.39 no.7
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    • pp.97-103
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    • 2002
  • In this paper, a Logarithmic Video Amplifier(LVA) for radar system or satellite communications is described. The proposed LVA is composed of a input stage, amplification stage, and output stage. As well as a novel series-parallel architecture is proposed for the purpose of wide dynamic range and high speed operation, a newly developed input stage is designed in order to control the voltage level between LVA and detector diode. The LVA is fabricated with a 1.5um 2-poly 2-metal n-well Bi-CMOS technology, and the chip area is 1310 um x 1540 um. From the experimental results, it consumes 190 mW at 10V power supply, the chip has 60 dB dynamic range and 100ns falling time.

The Effect of Audiovisual Information with Videotape on Knowledge and Attitude of Early Detection of Gastric Carcinoma (비디오 프로그램을 통한 정보제공이 위암조기발견에 대한 지식과 태도에 미치는 효과)

  • Kim, Myung-Joo;Tae, Young-Sook
    • Asian Oncology Nursing
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    • v.2 no.1
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    • pp.61-71
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    • 2002
  • Gastric Carcinoma is very plentiful and significant disease in Korean community. The reason is that Gastric Carcinoma is not a simply finding disease with unclear symptoms for early detection. Early detection and early medical treatment of a cancer patient is an important instrument of reducing the mortility rate. The purpose of this study is to identify the effect of audiovisual information with videotape infulencing on knowledge and attitude of early detection of gastric carcinoma. The research design was a non-equivalent control group, pre-post test. The subjects of this study were 52 members of D-taxi drivers which was located in Pusan. The subjects were twenty six experimental group and twenty six control group. The experimental group was collected from January 15, 1999 to January 26, 1999. The control group was collected from the research was 28 minutes video program which was turning out the form of documentary on the based practical experience. And also the experimental tool was used measurung instrument which measured a dependent, variable throughout the consulatation of an percentage, average, standard deviation, ${\chi}^2-test$ and t-test using spss/pc program. The result of this research were as follows : 1)" The experimental group which was offered the video program, should be higher in knowledge of early detection of the gastric carcinoma than the control group" was supported. (t= -7.754, p=.000) 2) "The experimental group which was offered the video program, should be higher in attitude of the early detection of the gastric carcinoma than the control group" was supported. (t=-4.321, p=.000) Therefore, in conclusion, this study that the audiovisual information with videotape influencing on knowledge and attitude of early detection of gastric carcionma was very representational experience throughout the video of documentary form on the based practical experience was much effected the change of the knowledge and the attitude regarding to the early detection of the gastric carcinoma was verified.

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A CMOS Wide-Bandwidth Serial-Data Transmitter for Video Data Transmission (영상신호 전송용 CMOS 광대역 시리얼 데이터 송신기)

  • Lee, Kyungmin;Park, Sung Min
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.4
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    • pp.25-31
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    • 2017
  • This paper presents a 270/540/750/1500-Mb/s serial-data transmitter realized in a $0.13-{\mu}m$ CMOS technology for the applications of video data transmission. A low-cost RG-58 copper cable(5C-HFBT-RG6T) is exploited as a transmission medium connected to a single BNC connector, which shows cable loss 45 dB in maximum at 1.5 GHz. RLGC modeling provides an equivalent circuit for SPICE simulations of which characteristics are very similar to the measured cable loss. The loss can be compensated by pre-emphasis at transmitter and equalization at receiver if needed. Measurements of the proposed transmitter chip demonstrate the operations of 270-Mb/s, 540-Mb/s, 750-Mb/s and 1.5-Gb/s, and provide the output voltage levels of $370mV_{pp}$ at 1.5 Gb/s even with the pre-emphasis turned-off. The total power consumption is 104 mW from 1.2/3.3-V supplies and the chip occupies the area of $1.65{\times}0.9mm^2$.

Quantization Level Selection of Intra-Frame for MPEG-4 Video Encoder (MPEG-4 부호화기에서의 인트라 프레임 양자화 레벨 선정)

  • Kim Jeong Woo;Cho Seong Hwan
    • Journal of Korea Multimedia Society
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    • v.8 no.1
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    • pp.9-18
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    • 2005
  • This paper presents the method of calculating the quantization level of the intra-frame in MPEG-4 video encoder. The intra-frame is an essential part in that the quality of the whole GOP is affected by the quality of this frame since the intra-frame, which works as a reference frame within GOP, continuously propagates through other frames. This work proposes how to use bits assigned for gaining the quantization level of the intra-frame, complexity of input images, and GOP structures. The result shows that while existing approaches have the decline in efficiency by using fixed values or show different qualifies depending on the characteristics of the images, the current approach shows the steady results in various images. Comparing with Q2 algorithm obtained in MPEG-4 VM, the approach suggested in this paper gains the benefit of maximum 3.49dB with some variations depending on the characteristics of the images.

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A VLSI Implementation of Real-time 8$\times$8 2-D DCT Processor for the Subprimary Rate Video Codec (저 전송률 비디오 코덱용 실시간 8$\times$8 이차원 DCT 처리기의 VLSI 구현)

  • 권용무;김형곤
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.1
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    • pp.58-70
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    • 1990
  • This paper describes a VLSI implementation of real-time two dimensional DCT processor for the subprimary rate video codec system. The proposed architecture exploits the parallelism and concurrency of the distributes architecture for vector inner product operation of DCT and meets the CCITT performance requirements of video codec for full CSIF 30 frames/sec. It is also shown that this architecture satisfies all the CCITT IDCT accuracy specification by simulating the suggested architecture in bit level. The efficient VLSI disign methodology to design suggested architecture is considered and the module generator oriented design environments are constructed based on SUN 3/150C workstation. Using the constructed design environments. the suggensted architecture have been designed by double metal 2micron CMOS technology. The chip area fo designed 8x8 2-D DA-DCT (Distributed Arithmetic DCT) processor is about 3.9mmx4.8mm.

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An Iterative Side Information Refinement Based on Block-Adaptive Search in Distributed Video Coding (분산 비디오 부호화에서 블록별 적응적 탐색에 기초한 반복적인 보조정보 보정기법)

  • Kim, Jin-Soo;Yun, Mong-Han;Kim, Jae-Gon;Seo, Kwang-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.2
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    • pp.355-363
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    • 2011
  • Recently, as one of several methods to improve the performance of DVC(Distributed Video Coding) system, many research works are focusing on the iterative refinement of side information. Most of the conventional techniques are mainly based on the relationship between the reconstruction level and side information, or the vector median filtering of motion vectors, but, their performance improvements are restricted. In order to overcome the performance limit of the conventional schemes, in this paper, a side information generation scheme is designed by measuring the block-cost estimation. Then, by adaptively selecting the compensation mode using the received bit-plane information, we propose a block-adaptive iterative refinement which is efficient for non-symmetric moving objects. Computer simulations show that, by using the proposed refinement method, the performance can be improved up to 0.2 dB in rate-distortion.

3D image mosaicking technique using multiple planes for urban visualization (복수 투영면을 사용한 도심지 가시화용 3 차원 모자이크 기술)

  • CHON Jaechoon;KIM Hyongsuk
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.42 no.3 s.303
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    • pp.41-50
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    • 2005
  • A novel image mosaicking technique suitable for 3D urban visualization is proposed. It is not effective to apply 2D image mosaicking techniques for urban visualization when, for example, one is filming a sequence of images from a side-looking video camera along a road in an urban area. The proposed method presents the roadside scene captured by a side-looking video camera as a continuous set of textured planar faces, which are termed 'multiple planes' in this paper. The exterior parameters of each frame are first calculated through automatically selected matching feature points. The matching feature points are also used to estimate a plane approximation of the scene geometry for each frame. These planes are concatenated to create an approximate model on which images are back-projected as textures. Here, we demonstrate algorithm that creates efficient image mosaics in 3D space from a sequence of real images.

A Study on Webtoon Production of Non-Phone Realistic Represent (비사실적 표현에 의한 웹툰 제작에 관한 연구)

  • Joo, Heon-Sik
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2014.01a
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    • pp.319-320
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    • 2014
  • 웹툰은 카툰을 대신하여 웹에서 새로운 카툰으로 등장하였고, 웹의 특징을 가지고 웹상에서 길이에 대한 제한을 받지 않으면서 세로로 스크롤 되면서 콘텐츠를 구동하게 된다. 웹툰의 제작은 대부분이 2D의 이미지 형태가 대부분인데 비사실적 표현기법으로 2D와 3D 비디오로 표현 형식으로 나타내었다. 비사실적 표현으로 2D의 플래시 기법과 3D의 모션 기법을 적용함으로 화려함과 생생한 리얼리티을 얻을 수 있지만 단점으로는 제작기법과 콘텐츠 재생 시간에서 콘텐츠의 용량 확대와 플레이 해상도 및 재생 런 타임 응답 속도 고려가 되어야 한다.

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