• Title/Summary/Keyword: Video Compression

Search Result 281, Processing Time 0.108 seconds

Embedded Video Compression Scheme using Wavelet Transform and 3-D Block Partition (Wavelet 변환과 3-D 블록분할을 이용하는 Embedded 비디오 부호화기)

  • Yang, Change-Mo;Lim, Tae-Beom;Lee, Seok-Pil
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.190-192
    • /
    • 2004
  • In this paper, we propose a low bit-rate embedded video compression scheme with 3-D block partition coding in the wavelet domain. The proposed video compression scheme includes multi-level 3-dimensional dyadic wavelet decomposition, raster scanning within each subband, formation of block, 3-D partitioning of block, and adaptive arithmetic entropy coding. Although the proposed video compression scheme is quit simple, it produces bit-stream with good features, including SNR scalability from the embedded nature. Experimental results demonstrate that the proposed video compression scheme is quit competitive to other good wavelet-based video coders in the literature.

  • PDF

Extracting Graphics Information for Better Video Compression

  • Hong, Kang Woon;Ryu, Won;Choi, Jun Kyun;Lim, Choong-Gyoo
    • ETRI Journal
    • /
    • v.37 no.4
    • /
    • pp.743-751
    • /
    • 2015
  • Cloud gaming services are heavily dependent on the efficiency of real-time video streaming technology owing to the limited bandwidths of wire or wireless networks through which consecutive frame images are delivered to gamers. Video compression algorithms typically take advantage of similarities among video frame images or in a single video frame image. This paper presents a method for computing and extracting both graphics information and an object's boundary from consecutive frame images of a game application. The method will allow video compression algorithms to determine the positions and sizes of similar image blocks, which in turn, will help achieve better video compression ratios. The proposed method can be easily implemented using function call interception, a programmable graphics pipeline, and off-screen rendering. It is implemented using the most widely used Direct3D API and applied to a well-known sample application to verify its feasibility and analyze its performance. The proposed method computes various kinds of graphics information with minimal overhead.

FROM PELS TO BITS: VIDEO COMPRESSION AND COMMUNICATION

  • Hang, Hsueh-Ming
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • /
    • pp.1-10
    • /
    • 1999
  • A new digital media ear started a couple of months ago when 10 major cities in USA first boradcasted the all digital HDTV on the air. Digital video compression has been studied for decades but only recently, it becomes practical and is used in our daily life. We give an overview of the progress of video compression in recent years, particularly, the ones related to international standards. Through examples, we like to introduce this fantastic subject to the readers who were not familiar with it before.

Constant Quality Motion Compensated Temporal Filtering Video Compression using Multi-block size Motion Estimation and SPECK (다중 블록 크기의 움직임 예측과 SPECK을 이용한 고정 화질 움직임 보상 시간영역 필터링 동영상 압축)

  • Park Sang-Ju
    • Journal of Broadcast Engineering
    • /
    • v.11 no.2
    • /
    • pp.153-163
    • /
    • 2006
  • We propose a new video compression method based on MCTF(motion compensated temporal filtering) with constant quality. SPECK is an efficient image compression coding method of encoding DWT coefficients. Especially SPECK method is very efficient for coding the motion compensated residual image which usually has larger amounts of high frequency components than the natural images. And proposed multi block size hierarchical motion estimation technique is more efficient than classical block matching algorithm with fixed block size both in estimation precision and operation costs. Proposed video method based on MCTF video compression can also support multi-frame rate decoding with reasonable complexity. Simulation results showed that proposed method outperforms H.263 video compression standard.

A full-Hardwired Low-Power MPEG4@SP Video Encoder for Mobile Applications (모바일 향 저전력 동영상 압축을 위한 고집적 MPEG4@SP 동영상 압축기)

  • Shin, Sun Young;Park, Hyun Sang
    • Journal of Broadcast Engineering
    • /
    • v.10 no.3
    • /
    • pp.392-400
    • /
    • 2005
  • Highly integrated MPEG-4@SP video compression engine, VideoCore, is proposed for mobile application. The primary components of video compression require the high memory bandwidth since they access the external memory frequently. They include motion estimation, motion compensation, quantization, discrete cosine transform, variable length coding, and so on. The motion estimation processor adopted in VideoCore utilizes the small-size local memories such that the video compression system accesses external memory as less frequently as possible. The entire video compression system is divided into two distinct sub-systems: the integer-unit motion estimation part and the others, and both operate concurrently in a pipelined architecture. Thus the VideoCore enables the real-time high-quality video compression with a relatively low operation frequency.

Sub-pixel Motion Estimation Algorithm with Low Computation Complexity for H.264 Video Compression (H.264 동영상 압축을 위한 낮은 복잡도를 갖는 부 화소 단위에서의 움직임 추정)

  • Lee, Yun-Hwa;Shin, Hyun-Chul
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.639-642
    • /
    • 2005
  • Motion Estimation(ME) is an important part of video compression, because it requires a large amount of computation. Half-pixel and quarter-pixel motion estimation allows high video compression rates but it also has high computation complexity. In this paper we suggest a new and efficient motion estimation algorithm for half-pixel and quarter-pixel motion estimation using SAD values. In the method, an integer-pixel motion vector is found and then only three neighboring points of the integer-pixel motion vector is evaluated to find the half-pixel motion vector. The quarter-pixel motion vector is also found by using a similar method. Experimental results of our method shows 20% reduction in computation time, when compared with those of a conventional method, while producing same quality motion vectors.

  • PDF

Three-Dimensional Subband Coding of Video using Wavelet Packet Algorithm (웨이브릿 패킷 알고리즘을 이용한 3차원 비디오 서브밴드 코딩)

  • Chu, Hyung Suk;An, Chong Koo
    • The Transactions of the Korean Institute of Electrical Engineers D
    • /
    • v.54 no.11
    • /
    • pp.673-679
    • /
    • 2005
  • This Paper presents the 3D wavelet transformation based video compression system, which possesses the capability of progressive transmission by increasing resolution and increasing rate for multimedia applications. The 3D wavelet packet based video compression system removes the temporal correlation of the input sequences using the motion compensation filter and decomposes the spatio-temporal subband using the spatial wavelet packet transformation. The proposed system allocates the higher bit rate to the low frequency image of the 3D wavelet sequences and improves the 0.49dB PSNR performance of the reconstructed image in comparison with that of H.263. In addition to the limitation on the propagation of the motion compensation error by the 3D wavelet transformation, the proposed system progressively transmits the input sequence according to the resolution and rate scalability.

Motion Compensated Video Compression based on Both Block and Object Motions (블록 이동(BMA)과 물체 이동(Object Motion)정보를 겸용한 이동 보상형 영상 압축 기법)

  • 천상훈;서강수;김재균
    • Proceedings of the Korean Institute of Communication Sciences Conference
    • /
    • /
    • pp.81-85
    • /
    • 1991
  • In this paper, we present a motion compensated video compression method based on both block and object motions. A simplified objectoriented motion parameter is estimated from the block based motion vectors. A decision rule for the global or local MCP modes is established. Simulation results show that the proposed method has lower bit-rates than the BMA based method at the same reconstruction errors.

An Embedded Video Compression Scheme Using a Three-Dimensional Rate-Distortion Optimization Based Block Coder (3차원 비트율-왜곡 최적화 기반 블록 부호화를 이용하는 임베디드 비디오 압축 방법)

  • Yang, Chang Mo;Chung, Kwangsue
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.41 no.10
    • /
    • pp.1155-1166
    • /
    • 2016
  • In this paper, we propose a new embedded video compression scheme which uses three-dimensional rate-distortion optimization based block coder. After the proposed scheme removes temporal redundancy by applying the motion compensated temporal filtering(MCTF) on input video frames, two dimensional discrete wavelet transform is applied on video frames to remove spatial redundancy. The three-dimensional wavelet coefficients generated in this way are sorted according to their expected rate-distortion slope and encoded by using the three-dimensional block partition coding method. The proposed scheme also uses both the effective color video coding method which maintains embedded features, and the efficient bit-rate control method. Experimental results demonstrate that the proposed scheme not only produces embedded bit-streams, but also outperforms existing video compression schemes.

A Fast Sub-pixel Motion Estimation Method for H.264 Video Compression (H.264 동영상 압축을 위한 부 화소 단위에서의 고속 움직임 추정 방법)

  • Lee, Yun-Hwa;Choi, Myung-Hoon;Shin, Hyun-Chul
    • Journal of KIISE:Software and Applications
    • /
    • v.33 no.4
    • /
    • pp.411-417
    • /
    • 2006
  • Motion Estimation (ME) is an important part of video coding process and it takes the largest amount of computation in video compression. Half-pixel and quarter-pixel motion estimation can improve the video compression rate at the cost of higher computational complexity In this paper, we suggest a new efficient low-complexity algorithm for half-pixel and quarter pixel motion estimation. It is based on the experimental results that the sum of absolute differences(SAD) shows parabolic shape and thus can be approximated by using interpolation techniques. The sub-pixel motion vector is searched from the minimum SAD integer-pixel motion vector. The sub-pixel search direction is determined toward the neighboring pixel with the lowest SAD among 8 neighbors. Experimental results show that more than 20% reduction in computation time can be achieved without affecting the quality of video.