• Title/Summary/Keyword: Motion Compensation

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Frame Rate up-conversion Algorithm using Adaptive Overlapped Block Motion Compensation (적응적 중첩 블록 움직임 보상을 이용한 프레임 율 향상 알고리즘)

  • Lee, Kangjun
    • Journal of Broadcast Engineering
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    • v.24 no.5
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    • pp.785-790
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    • 2019
  • In this paper, a new bilateral frame rate up-conversion algorithm using adaptive overlapped block motion compensation is proposed. In this algorithm, the adaptive overlapped block motion compensation is based on the motion complexity of the reference region. As the motion complexity is determined by the size of the previously coded motion estimation prediction, the overlapped block motion compensation method is selected without any additional computational complexity. Experimental results show that the proposed algorithm provides better image quality than conventional methods both objectively and subjectively.

De-interlacing Algorithm based on Motion Compensation Reliability (움직임 보상의 신뢰도에 기반 한 순차주사화 알고리즘)

  • Chang, Joon-Young;Kim, Young-Duk;Kang, Moon-Gi
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.46 no.6
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    • pp.102-111
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    • 2009
  • In this paper, we propose a de-interlacing algorithm that combines a motion compensation (MC) method and the vertical-temporal filter with motion compensation (MC V-T filter) according to motion compensation reliability. The MC method represent one of the best ways of improving the resolution of de-interlaced frames, but it may introduce motion compensation artifacts in regions with incorrect motion information. In these regions, the MC V-T filter that is very robust to motion vector errors can be used to correct motion compensation artifacts. The combination between two methods is controlled by the motion compensation reliability that is measured by analyzing the estimated motion vectors and the results of MC. The motion compensation reliability contains information about motion compensation artifacts of MC results and determines the combination weight according to this information. Therefore, the combination rule of the proposed method is more accurate than those of the conventional methods and it enables the proposed method to provide high quality video sequences without producing any visible artifacts. Experimental results with various test sequences show that the proposed algorithm outperforms conventional algorithms in terms of both visual and numerical criteria.

Fire Detection Algorithm for a Quad-rotor using Ego-motion Compensation (Ego-Motion 보정기법을 적용한 쿼드로터의 화재 감지 알고리즘)

  • Lee, Young-Wan;Kim, Jin-Hwang;Oh, Jeong-Ju;Kim, Hakil
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.1
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    • pp.21-27
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    • 2015
  • A conventional fire detection has been developed based on images captured from a fixed camera. However, It is difficult to apply current algorithms to a flying Quad-rotor to detect fire. To solve this problem, we propose that the fire detection algorithm can be modified for Quad-rotor using Ego-motion compensation. The proposed fire detection algorithm consists of color detection, motion detection, and fire determination using a randomness test. Color detection and randomness test are adapted similarly from an existing algorithm. However, Ego-motion compensation is adapted on motion detection for compensating the degree of Quad-rotor's motion using Planar Projective Transformation based on Optical Flow, RANSAC Algorithm, and Homography. By adapting Ego-motion compensation on the motion detection step, it has been proven that the proposed algorithm has been able to detect fires 83% of the time in hovering mode.

ISAR Motion Compensation based on Accumulation and Limitation of Consecutive Radar Returns

  • Seo, Dong-Shin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1803-1812
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    • 2000
  • A new motion compensation method for ISAR is presented in this paper. It employs amplitude limiting and integration of consecutive range profiles to improve the range and phase alignment accuracy and to alter the propagation properties of compensation errors. These allow the image quality to be significantly improved. It is shown from the imaging results that the new motion compensation algorithm can get images of targets in field situations with much better quality than the traditional cross-correlation algorithm.

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A Tracking Filter with Motion Compensation in Local Navigation Frame for Ship-borne 2D Surveillance Radar (2 차원 탐색 레이다를 위한 국부 항법 좌표계에서의 운동보상을 포함한 추적필터)

  • Kim, Byung-Doo;Lee, Ja-Sung
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.5
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    • pp.507-512
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    • 2007
  • This paper presents a tracking filter with ship's motion compensation for a ship-borne radar tracking system. The ship's maneuver is described by displacement and rotational motions in the ship-centered east-north frame. The first order Taylor series approximation of the measurement error covariance of the converted measurement is derived in the ship-centered east-north frame. The ship's maneuver is compensated by incorporating the measurement error covariance of the converted measurement and displacement of the position state in the tracking filter. The simulation results via 500 Monte-Carlo runs show that the proposed method follows the target successfully and provides consistent tracking performance during ship's maneuvers while the conventional tracking filter without ship motion compensation fails to track during such periods.

Stabilization of Target Tracking with 3-axis Motion Compensation for Camera System on Flying Vehicle

  • Sun, Yanjie;Jeon, Dongwoon;Kim, Doo-Hyun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.9 no.1
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    • pp.43-52
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    • 2014
  • This paper presents a tracking system using images captured from a camera on a moving platform. A camera on an unmanned flying vehicle generally moves and shakes due to external factors such as wind and the ego-motion of the machine itself. This makes it difficult to track a target properly, and sometimes the target cannot be kept in view of the camera. To deal with this problem, we propose a new system for stable tracking of a target under such conditions. The tracking system includes target tracking and 3-axis camera motion compensation. At the same time, we consider the simulation of the motion of flying vehicles for efficient and safe testing. With 3-axis motion compensation, our experimental results show that robustness and stability are improved.

New De-interlacing Algorithm Combining Edge Dependent Interpolation and Global Motion Compensation Based on Horizontal and Vertical Patterns (수평, 수직 패턴에 기반 한 경계 방향 보간과 전역 움직임 보상을 고려한 새로운 순차주사화 알고리즘)

  • 박민규;이태윤;강문기
    • Journal of Broadcast Engineering
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    • v.9 no.1
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    • pp.43-53
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    • 2004
  • In this paper, we propose a robust deinterlacing algorithm which combines edge dependent interpolation (EDI) and global motion compensation (GMC). Generally, EDI algorithm shows a visually better performance than any other deinterlacing algorithm using one field. However, due to the restriction of information in one field, a high duality progressive image from Interlaced sources cannot be acquired by intrafield methods. On the contrary, since algorithms based on motion compensation make use of not only spatial information but also temporal information, they yield better results than those of using one field. However, performance of algorithms based on motion compensation depends on the performance of motion estimation. Hence, the proposed algorithm makes use of mixing process of EDI and GMC. In order to obtain the best result, an adaptive thresholding algorithm for detecting the failure of GMC is proposed. Experimental results indicate that the proposed algorithm outperforms the conventional approaches with respect to both objective and subjective criteria.

Integration of Motion Compensation Algorithm for Predictive Video Coding (예측 비디오 코딩을 위한 통합 움직임 보상 알고리즘)

  • Eum, Ho-Min;Park, Geun-Soo;Song, Moon-Ho
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.36S no.12
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    • pp.85-96
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    • 1999
  • In a number of predictive video compression standards, the motion is compensated by the block-based motion compensation (BMC). The effective motion field used for the prediction by the BMC is obviously discontinuous since one motion vector is used for the entire macro-block. The usage of discontinuous motion field for the prediction causes the blocky artifacts and one obvious approach for eliminating such artifacts is to use a smoothed motion field. The optimal procedure will depend on the type of motion within the video. In this paper, several procedures for the motion vectors are considered. For any interpolation or approaches, however, the motion vectors as provided by the block matching algorithm(BMA) are no longer optimal. The optimum motion vectors(still one per macro-block) must minimize the of the displaced frame difference (DFD). We propose a unified algorithm that computes the optimum motion vectors to minimize the of the DFD using a conjugate gradient search. The proposed algorithm has been implemented and tested for the affine transformation based motion compensation (ATMC), the bilinear transformation based motion compensation (BTMC) and our own filtered motion compensation(FMC). The performance of these different approaches will be compared against the BMC.

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The Improvement of Motion Compensation for a Moving Target Using the Gabor Wavelet Transform (Gabor Wavelet Transform을 이용한 움직이는 표적에 대한 움직임 보상 개선)

  • Shin, Seung-Yong;Myung, Noh-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.10
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    • pp.913-919
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    • 2006
  • This paper presents a technique for motion compensation of ISAR(Inverse SAR) images for a moving target. If a simple fourier transform is employed to obtain ISAR image for a moving target, the image is usually blurred. These images blurring problem can be solved with the time-frequency transform. In this paper, motion compensation algorithms of ISAR image such as STFT(Short Time Fourier Transform), GWT(Gabor Wavelet Transform) are described. In order to show the performances of each algorithm, we use scattering wave of the ideal point scatterers and simulated MIG-25 to obtain motion compensated ISAR image, and display the resolution of STFT and GWT ISAR image.