Abstract:
본 발명은 방사형 좌표계에서의 자기공명 영상 방법에 관한 것으로, 방사형 좌표계를 통해 획득 된 PI데이터를 사용하여 영상을 얻을 때 기존에 사용되는 FBP 방식 대신 MLEM 기법을 코일 간의 sensitivity map과 함께 적용하여 보다 정확한 영상을 복원하는 방식을 제안하였다. 본 발명에 의한 방사형 좌표계에서의 자기공명 영상 방법은, (a) 자기공명영상장치(MRI)에서 병렬 코일을 통해 방사형으로 샘플링 된 복수 개의 샘플링 신호( g )를 획득하는 단계와, (b) 상기 복수 개의 샘플링 신호( g ) 각각에 대해 센시티비티 백 프로젝션(Sensitivity Back Projection)을 이용하여 하나씩 이미지 복원하는 단계와, (c) 상기 (b)단계에서 복원 된 영상( f )으로부터 정사영 된 신호를 각각 계산하고, 상기 정사영 신호를 하나씩 이미지 복원하는 단계와, (d) 상기 (c)단계에서 복원된 MRI 영상( f )과 샘플링 신호( g )의 조건부 확률을 구하여 확률의 최대치를 각각 산출하는 단계와, (e) 상기 (d)단계에서 확률의 최대치가 되는 MRI 영상( f )과 샘플링 신호( g )를 하나로 합쳐서 영상을 복원하는 단계 및, (f) 상기 (b) 및 (e)단계를 반복 수행하여 최종적으로 확률이 최대치가 되는 영상( f )을 복원된 최종 결과 영상으로 결정하는 단계를 포함하고 있다.
Abstract:
PURPOSE: An image encoding method based on motion vector normalization and an apparatus thereof, and an encoding method of an image and an apparatus thereof are provided to provide a consistent motion vector field as acquiring the motion vector close to actual motion of the object, by acquiring a larger merged block by merging blocks included in the same object, and predicting the motion vector on the basis of the acquired merged block. CONSTITUTION: A motion prediction and compensation part acquires motion vectors of blocks, and merges two adjacent blocks (910,920). The motion prediction and compensation part acquires a motion vector (930). For the merged block, a block merge part acquires variation of motion prediction error prepared for uniformity of the motion vector by the merging (940). On the basis of the acquired variation, the block merge part determines a merged block which has the smallest variation among the merged blocks, and determines whether to merge the blocks included in the determined merged block (950). [Reference numerals] (910) Acquire the motion vectors of blocks; (920) Merge two adjacent blocks and acquire the merged blocks; (930) Acquire the movement vector of the merged blocks; (940) Acquire the variation of motion prediction errors prepared for uniformity of the motion vector based on the motion vector of the merged blocks, the motion vectors of the blocks contained in the merged block, the motion vectors of the blocks around the merged block, and the motion vectors of the blocks around the blocks contained in the merged block; (950) Determine the merged block which has the smallest variation among the merged blocks based on the acquired variation and determine whether to merge the blocks contained in the determined merged block; (AA) Start; (BB) End
Abstract:
본 발명은 융합 시스템에 관한 것으로, 더욱 상세하게는 PET(Positron Emission Tomography)-MRI(Magnetic Resonance Imaging) 융합 시스템에 관한 것이다. 본 발명의 실시 예에 따른 PET-MRI 융합 시스템은, 원통형으로서 외벽과 내벽을 갖는 마그네트 보어(Magnet bore); 상기 마그네트 보어의 내벽에 인접하여 설치된 경사 코일(Gradient Coil); 상기 경사 코일의 내벽에 인접하여 설치되고, RF 펄스신호를 방출하고, 상기 RF 펄스신호에 대응하는 MRI 데이터를 검출하는 MRI RF 코일; 및 PET 데이터를 검출하며 상기 PET-MRI 시스템에서 탈부착이 가능한 PET 검출기를 포함한다.
Abstract:
PURPOSE: A method for interpolating an image frame and a device thereof are provided to accurately interpolate a small object by obtaining position information of the small object. CONSTITUTION: A motion predicting unit(110) generates a motion vector through motion prediction between a first image frame and a second image frame. A frame interpolating unit(120) interpolates a third image frame between the first and the second image frames based on the generated motion vector. A post-processing unit(130) removes a fault of the interpolated third image frame through the post-processing of the interpolated third image frame. [Reference numerals] (110) Motion predicting unit; (120) Frame interpolating unit; (130) Post-processing unit; (131) Motion direction predicting unit; (132) Object area determining unit; (133) Object interpolating unit; (AA) Original image frame; (BB) Interpolated image frame
Abstract:
PURPOSE: A sub information generating system for Wyner Ziv video coding and a method thereof are provided to drastically lower encoding and decoding complexity by generating sub information in a DC band and an AC band. CONSTITUTION: An image encoding unit(200) encodes a Wyner Ziv image which is reduced up to a fixed size. An image decoding unit(300) decodes the encoded Wyner Ziv image. A refinement unit(400) refines sub information. A block selecting unit selects a block which exceeds a reference value in which a difference value between a frontal image and a rear image.
Abstract:
PURPOSE: A high speed motion estimation method using multi reference frames are provided to perform the motion estimation task in a short time. CONSTITUTION: A high speed motion estimation method comprises steps of: analyzing reference index information for showing a reference image(S30); selecting a reference image if reference images of surrounding blocks are same(S31); performing a motion estimation of a current block about the selected reference image(S33); and performing a motion estimation of the current block about all reference images(S32).