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研究生:楊雅茹
論文名稱:一個利用動作補償來達成影片更新率提高的方法
論文名稱(外文):A New Method for Frame Rate Up-Conversion Based on Motion Compensation
指導教授:陳玲慧陳玲慧引用關係
學位類別:碩士
校院名稱:國立交通大學
系所名稱:資訊科學系所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:24
中文關鍵詞:動作補償更新率
外文關鍵詞:motion compensationframe rate up-conversion
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近年來新的電視系統的興起,為了追求更好的影片品質,新的電視播放系統有著較高的更新率(frame rate)。為了讓更新率較低的影片可以順利地在新系統播放,更新率的提高(frame rate up-conversion)是必要的。在這篇論文裡,我們將利用影片壓縮的技巧內插生成補圖,來達到更新的提高。為了容易研究與使用,我們亦發展了一個方便使用的系統。
Frame rate up-conversion (FRC) is a conversion between any two display formats with different frame rates. For improving visual quality, the frame rate required for high definition television (HDTV) is much higher than the current frame rate. That is, the frame rate should be up-converted in HDTV.
In this thesis, we present a frame interpolation algorithm for FRC. In the proposed scheme, forward motion estimation (ME) is performed to generate the motion vectors (MVs) that determine how the frame will be interpolated. Based on the naturally perceptual scene, we set a threshold for ME, and only refer to one frame information when the interpolation frame is constructed in the process of motion compensated (MC). To solve the problem of overlapped and hole regions introduced in MC, a weighted average compensation technique is presented to process the overlapped regions, and a block based algorithm is provided to process the hole regions. Moreover, the overlapping block ME improves the quality of FRC. Finally, experimental results of the proposed method are compared with the results of the hierarchical motion compensated frame interpolation (HMCFI) method. The PSNR of the interpolated frames by the proposed method and by HMCFI are near enough, however, the proposed method provides a better perception result.
TABLE OF CONTENTS
ABSTRACT……………………………………………………………….I
ABSTRACT(IN CHINESE)……………………………………………III
ACKNOWLEDGEMENT(IN CHINESE)……………….……………IV
TABLE OF CONTENTS…………………………………….………….V
LIST OF FIGURES…………………………….…………..…………..VI
CHAPTER 1 INTRODUCTION………….…………………………….1
CHAPTER 2 THE PROPOSED METHOD……………………………9
2.1 Motion estimation and motion compensated interpolation………………………...7
2.2 Overlapped and hole regions processing…………………………………………...8
2.2.1 Overlapped region processing…………………………………………………….9
2.2.2 Hole region processing…………………………………………………………..10
2.2.2.1 The process of block compensated with partial hole region…………………...11
2.2.2.2 The processing of block with complete hole region…………………………...12
2.2.3 Motion estimation with overlapping……………………………………………..13
CHAPTER 3 EXPERIMENTAL RESULTS…………….……………15
3.1 Comparison with hierarchical MCFI………………………………………………15
3.2 Effectiveness of overlapping block………………………………………………..19
CHAPTER 4 CONCLUSIONS…………………………………………23
REFERENCES……………………………………………..……………24

LIST OF FIGURES
Fig. 1-1 Hole and overlapped regions in the interpolated frame……………………….2
Fig. 1-2 (a) Estimated MV, Vb, computed during ME. (b) Interpolation using blocks from (k-1)th and kth frames……………………………………..……………………….3
Fig. 2-1 Block diagram of the proposed method...……………………………………..6
Fig. 2-2 Frame interpolation by the proposed method with Macroblock I inserted…....7
Fig. 2-3 (a) The previous and current frames. (b) The interpolated frame by the proposed motion estimation and motion compensated interpolation with frames of (a)…………8
Fig. 2-4 Three types of blocks in the interpolation frame……………………………...9
Fig. 2-5 The interpolated frame about Fig. 2-3(b) after processing of the overlapped regions by the proposed method………………………………………………………..10
Fig. 2-6 (a) A block with partial hole region (black part). (b) Scan the block row by row, and stop scanning when the first scanned pixel in a row belongs to the hole region. (c) Change the scanning direction and scan the block column by column. (d) The compensated block………………………………………………………………………11
Fig. 2-7 The order of the block scanning direction with bold arrow indicating the first scanning row(column)…………………………………………………………………..12
Fig. 2-8 The interpolated frame about Fig. 2-5 after processing of the compensated block with the partial hole regions by the proposed method…………………………………..12
Fig. 2-9 The neighboring pixels marked by white color around block…………………13
Fig. 2-10 The interpolated frame about Fig. 2-8 after processing of the complete hole block regions by the proposed method………………………………………………….13
Fig. 2-11 Motion estimation using overlapping block………………………………….14
Fig. 2-12 The interpolated frame about Fig. 2-3(a) after processing of the overlapped regions with half block overlapped…………………………………………………....14
Fig. 3-1 “Calendar” sequences: (a) previous frame, (b) current frame, (c) frame interpolated by the HMCFI, (d) frame interpolated by the proposed method, (e) an enlarged region of (c) by a factor of two, (f) an enlarged region of (d) by a factor of two……………………………………………………………………………….........16
Fig. 3-2 “Foreman” sequences: (a) previous frame, (b) current frame, (c) frame interpolated by the HMCFI, (d) frame interpolated by the proposed method, (e) an enlarged region of (c) by a factor of two, (f) an enlarged region of (d) by a factor of two…………………………………………………………………………………….17
Fig. 3-3 “Table” sequences: (a) previous frame, (b) current frame, (c) frame interpolated by the HMCFI, (d) frame interpolated by the proposed method without overlapping...18
Fig. 3-4 The PSNR computation of the sequences: (a) the sequence of “foreman”, (b) the sequence of “table”…………………………………………………………………....20
Fig. 3-5 “Table” sequences: (a) previous frame, (b) current frame, (c) frame interpolated by the proposed method without overlapping, (d) frame interpolated by the proposed method with overlapping, (e) and (f) enlarged regions of (c) and (d) by a factor two, respectively……………………………………………………………………………22
[1] B.-W. Jeon, G.-I. Lee, S.-H. Lee, and R.-H. Park, “Coarse-to-Fine Frame Interpolation for Frame Rate Up-Conversion Using Pyramid Structure,” IEEE Trans. Consumer Electronics, vol. 49, no. 3, pp. 499-508, Aug. 2003.
[2] K. A. Bugwadia, E. D. Petajan, and N. N. Puri, “Progressive-Scan Rate Up-Conversion of 24/30 Source Materials for HDTV,” IEEE Trans. Consumer Electronics, vol. 42, no. 3, pp. 312-321, Aug. 1996.
[3] S. C. Han and J. W. Woods, “Frame-rate Up-conversion Using Transmitted Motion and Segmentation Fields for Very Low Bit-rate Video Coding,” in Proc. Int. Conf. Image Processing, vol. 1, pp. 747-750, Oct. 1997.
[4] ITU-T Recommendation H.263, Video Coding for Low Bit-Rate Communications. Nov. 1995.
[5] ISO/IEC JTC1/SC29/WG11 MPEG93/N457, MPEG-2 Test Model Version5. Mar. 1993.
[6] J. N. Youn, M. T. Sun, and C. W. Lin, “Motion estimation for high performance transcoding,” IEEE Trans. Consumer Electronics, vol. 44, no. 3, pp. 649-658, 1998.
[7] G. D. Haan, P. W. A. C. Biezen, H. Huijgen, and O. A. Ojo, “True-motion estimation with 3-D recursive search block matching,” IEEE Trans. Circuits Syst. Video Technol., vol. 3, no. 5, pp. 368-379, Oct. 1993.
[8] F. Dufaux and F. Moscheni, “Motion estimation techniques for digital TV: A review and a new contribution,” Proc. IEEE, vol. 83, pp. 858-876, June. 1995.
[9] S.-H. Lee, Y.-C. Shin, S.-J. Yang, H.-H. Moon, and R.-H. Park, “Adaptive motion compensated interpolation for frame rate up-conversion,” IEEE Trans. Consumer Electronics, vol. 48. no. 3, pp. 444-450, Aug. 2002.
[10] B.–T. Choi, S.–H. Lee, and S.–J. Ko, “New frame rate up-conversion using bi-directional motion estimation,” IEEE Trans. Consumer Electronics, vol. 46, no. 3, pp. 603-609, Aug. 2000.
[11] K. Hilman, H.–W. Park, and Y.-M. Kim, “Using motion compensated frame-rate conversion for the correction of 3:2 pulldown artifacts in video sequences,” IEEE Trans. Circuits Syst. Video Technol., vol. 10, no. 6, pp. 869-877, Sept. 2000.
[12] R. Castagno, P. Haavisto, and G. Ramponi, “A method for motion adaptive frame rate up-conversion,” IEEE Trans. Circuits Syst. Video Technol., vol. 6, no. 5, pp. 436-446, Oct. 1996.
[13] S.-H. Lee, O. Kwon, and R.-H Park, “Weighted-Adaptive Motion-Compensated Frame Rate Up-Conversion,” IEEE Trans. Consumer Electronics, vol. 49, no. 3, pp. 485-492, Aug. 2003.
[14] R. Thoma and M. Bierling, “Motion compensating interpolation considering covered and uncoverd background,” Signal Processing: Image Compression, vol. 1, pp. 192-212, 1989.
[15] M. Bierling and R. Thoma, “Motion Compensating field interpolation using a hierarchically structured displacement estimator,” Signal Processing, vol. 11, no. 4, pp. 387-404, Dec. 1986.
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