• Title, Summary, Keyword: Video encoder

Search Result 422, Processing Time 0.038 seconds

A Design of A Multistandard Digital Video Encoder using a Pipelined Architecture

  • Oh, Seung-Ho;Park, Han-Jun;Kwon, Sung-Woo;Lee, Moon-Key
    • Journal of Electrical Engineering and information Science
    • /
    • v.2 no.5
    • /
    • pp.9-16
    • /
    • 1997
  • This paper describes the design of a multistandard video encoder. The proposed encoder accepts conventional NTSC/PAL video signals, It also processes he PAL-plus video signal which is now popular in Europe. The encoder consists of five major building functions which are letter-box converter, color space converter, digital filters, color modulator and timing generator. In order to support multistandard video signals, a programmable systolic architecture is adopted in designing various digital filters. Interpolation digital filters are also used to enhance signal-to-noise ratio of encoded video signals. The input to the encoder can be either YCbCr signal or RGB signal. The outputs re luminance(Y), chrominance(C), and composite video baseband(Y+C) signals. The architecture of the encoder is defined by using Matlab program and is modelled by using Veriflog-HDL language. The overall operation is verified by using various video signals, such as color bar patterns, ramp signals, and so on. The encoder contains 42K gates and is implemented by using 0.6um CMOS process.

  • PDF

Design and Implementation of Video Encoder with Error less than $\pm$1 LSB ($\pm$1LSB 이하의 오차를 가지는 복합 영상 부호화기의 설계 및 구현)

  • 김주현;강봉순
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.8 no.6
    • /
    • pp.1147-1152
    • /
    • 2004
  • This paper presents the design of a multi-standard NTSC/PAL video encoder. The encoder converts International Telecommunication Union-Recommendation (ITU-R) BT.601 4:2:2, ITU-R BT.656 or RGB inputs from various video sources into National Television Standards Committee (NTSC) or phase-alternate line (PAL) TV signals in both S-video and composite video baseband signals (CVBS). The encoder adopts multiplier-free structures to reduce hardware complexity. The hardware bit width of programmable digital filters for luminance and chrominance signals, along with other operating blocks, are carefully determined to produce high-quality digital video signals of 1 least significant bit (LSB) error or less. The proposed encode. is experimentally demonstrated by using the Altera APEX20K600EBC652-3 device.

Design of Video Encoder activating with variable clocks of CCDs for CCTV applications (CCTV용 CCD를 위한 가변 clock으로 동작되는 비디오 인코더의 설계)

  • Kim, Joo-Hyun;Ha, Joo-Young;Kang, Bong-Soon
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.10 no.1
    • /
    • pp.80-87
    • /
    • 2006
  • SONY corporation preoccupies $80\%$ of a market of the CCD used in a CCTV system. The CCD of SONY have high duality which can not follow the progress of capability. But there are some problems which differ the clock frequency used in CCD from the frequency used in common video encoder. To get the result by using common video encoder, the system needs a scaler that could adjust image size and PLL that synchronizes CCD's with encoder's clock So, this paper proposes the video encoder that is activated at equal clock used in CCD without scaler and PLL. The encoder converts ITU-R BT.601 4:2:2 or ITU-R BT.656 inputs from various video sources into NTSC or PAL signals in CVBS. Due to variable clock, property of filters used in the encoder is automatically changed by clock and filters adopt multiplier-free structures to reduce hardware complexity. The hardware bit width of programmable digital filters for luminance and chrominance signals, along with other operating blocks, are carefully determined to produce hish-quality digital video signals of ${\pm}1$ LSB error or less. The proposed encoder is experimentally demonstrated by using the Altera Stratix EP1S80B953C6ES device.

An ASIC Implementation of Digital NTSC/PAL Video Encoder (디지탈 NTSC/PAL 비디오 부호화기의 ASIC 구현)

  • Oh, Seung-Ho;Lee, Moon-Key
    • Journal of the Korean Institute of Telematics and Electronics S
    • /
    • v.35S no.6
    • /
    • pp.109-118
    • /
    • 1998
  • This paper presents an ASIC implementation of video encoder which converts either digital RGB or YCbCr to S-video(Y/C) and composite video signal. The video timing signal of this encoder includes horizontal sync., vertical sync. signal and blanking, and this encoder supports field identification signal which is convenient for video editing. The encoder has been designed in the 4 stages pipeline structure to assure the stable operation of each submodule. The proposed encoder requires only 20K gates ,which is a 40% reduction in hardware compared with [13]. The designed encoder was fabricated in $0.65{\mu}m$ SOG triple metal CMOS technology. Chip size is $3.7478mm {\times} 4.4678mm$ including PAD, gate counts is 19,468 and dissipated power is 0.9W.

  • PDF

Complexity and Performance Analysis of SVC(Scalable Video Coding) Encoder Models for T-DMB/AT-DMB Video Service (T-DMB/AT-DMB 비디오 서비스를 위한 스케일러블 부호화기 모델에 따른 복잡도 및 성능 분석)

  • Kim, Kyu-Seok;Kim, Pil-Joong;Kim, Jin-Soo;Lee, Si-Woong;Kim, Jae-Gon;Choi, Hae-Chul
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • /
    • pp.123-126
    • /
    • 2007
  • This paper presents the SVC (Scalable Video Coding) scheme which enables the AT-DMB (Advanced Terrestrial - DMB) video service in enhancement layer, while keeping the current T-DMB video service in base layer. But, it is very complicate to implement the SVC encoder and so it is necessary to analyze the complexity and performance for SVC encoder's structures and coding parameters. In this paper, through computer simulations, SVC coding parameters are tested and then, based on these results, three types of SVC encoder models are compared from the viewpoint of the complexity and performance.

  • PDF

Design of Digitalized SECAM Video Encoder with Modified Anti-cloche filter and SECAM Video Decoder with BPF and Error-free Square Root (개선된 Anti-cloche Filter와 BPF 그리고 오차가 없는 제곱근기를 사용한 SECAM Encoder와 Decoder의 설계)

  • Ha, Joo-Young;Kim, Joo-Hyun;Kang, Bong-Soon
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.10 no.3
    • /
    • pp.511-516
    • /
    • 2006
  • In this raper, we propose the Sequentiel Couleur Avec Memoire or Sequential Color with Memory (SECAM) video encoder system using modified anti-cloche filters and the SECAM video decoder system using a band pass filter (BPF) and an error-free square root. The SECAM encoder requires an anti-cloche filter recommended by International Telecommunication Union-Recommendation (ITU-R) Broadcasting service Television (BT) 470. However, the design of the anti-cloche filter is difficult because the frequency response of the anti-cloche filter is very sharp around rejection-frequency area. So, we convert the filter into a hish pass filter (HPF) by shifting the rejection frequency of 4.286MHz to 0Hz frequency. The design of HPF becomes very easy, compared to that of the anti-cloche filter. The proposed decoder also uses an error-free square root, two differentiators and trigonometric functions to extract color-component information of Db and Dr accurately from frequency modulation (FM) signals in SECAM systems. Also, the BPF in decoder it used for removing color noise in chrominance and dividing CVBS into chrominance and luminance. The proposed systems are experimentally demonstrated with Altera FPGA APEX20KE EP20K1000EBC652-3 device and TV sets.

Optimal Parameter Selection of H.264 Encoder For Mobile Devices (모바일 기기를 위한 H.264 인코더의 최적 매개변수의 결정)

  • Ryu, Minhee;Kim, Hyungshin
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.13 no.10
    • /
    • pp.4780-4785
    • /
    • 2012
  • As many mobile devices such as smart phones and tablets are widely spread, optimized mobile video encoder used during video recording application is needed. In this paper, we implemented H.264/AVC base profile video encoder on a mobile device and empirically optimized control parameters of the encoder. As the experiment, we more than 100 test cases were designed with varying Lagrangian optimization, Hadamard Transform, search range, I-frame period, and reference frames. During the experiment, we measured picture quality, bit-rate, encoding time, motion estimation time, and power consumption. From the result, we can determine optimal values for the H.264 control parameters.

Channel-Adaptive Rate Control for Low Delay Video Coding

  • Lee, Yun-Gu
    • IEIE Transactions on Smart Processing and Computing
    • /
    • v.5 no.5
    • /
    • pp.303-309
    • /
    • 2016
  • This paper presents a channel-adaptive rate control algorithm for low delay video coding. The main goal of the proposed method is to adaptively use the unknown available channel bandwidth while reducing the end-to-end delay between encoder and decoder. The key idea of the proposed algorithm is for the status of the encoder buffer to indirectly reflect the mismatch between the available channel bandwidth and the generated bitrate. Hence, the proposed method fully utilizes the unknown available channel bandwidth by monitoring the encoder buffer status. Simulation results show that although the target bitrate mismatches the available channel bandwidth, the encoder efficiently adapts the given available bandwidth to improve the peak signal-to-noise ratio.

Seamless Video Switching System for Service Compatible 3DTV Broadcasting

  • Kim, Sangjin;Jeon, Taehyun
    • ETRI Journal
    • /
    • v.38 no.5
    • /
    • pp.847-857
    • /
    • 2016
  • Broadcasting services such as multi/single channel HDTV and 3DTV/2DTV use a multi-channel encoder that changes the bitrate and composition of the video service depending on the time. However, this type of multi-channel encoder could cause a longer latency owing to the variable bitrate and relatively bigger size of the buffers, which results in the same delay as in 3DTV even for a conventional DTV service. On the other hand, systems built based on separate encoders, each of which is optimized for the target service, might not have such latency problems. Nevertheless, there might be a distortion problem in the image and sound at the time of a switchover between two encoders with different output bitrates and group of picture structures. This paper proposes a system that can realize a seamless video service conversion using two different video encoders optimized for each video service. An overall functional description of the video service change control server, which is a main control block for the proposed system, is also provided. The experiment results confirm the seamless switchover and reduced broadcasting latency of DTV services compared with a broadcasting system composed of a multi-channel encoder system.

Fast Prediction Unit Decision Using Quantized Transform Coefficient (양자화된 트랜스폼 계수를 이용한 고속 Prediction Unit 결정방법)

  • Gweon, Ryeong-Hee;Lee, Yung-Lyul
    • Journal of Broadcast Engineering
    • /
    • v.17 no.5
    • /
    • pp.725-733
    • /
    • 2012
  • MPEG and VCEG have constituted a collaboration team called JCT-VC(Joint Collaborative Team on Video Coding) and have been developing the HEVC(High Efficiency Video Coding) standard. The next generation video coding standard HEVC shows higher compression rate compared with the H.264/AVC standard, but the encoder computational complexity of the HEVC encoder is significantly high. In order to reduce this computational complexity in the HEVC encoder, a fast prediction unit decision is proposed. The proposed fast prediction unit decision method reduces the encoder complexity by skipping the remaining prediction units if the current prediction unit does not have any non-zero quantized transform coefficient. The proposed method reduces the encoder computational complexity by 50.3% comparing with HM6.0 but it maintains the same level of coding efficiency.