CAJ | 학술논문

在影像的医学诊断中,为了从图像中挖掘出尽可能多的决策信息,需要有效的图像增强算法.在分析人眼视觉特性的基础上,针对小波不能"最优"表示含线、面奇异的二维图像的问题,提出了基于几何多尺度方向窗的图像增强算法.利用图像的几何特征,在小波域中划分出同质窗和结构方向窗.首先在同质窗内抑制噪声;然后计算出结构方向窗的晃何方向,再沿窗方向作2-D向1-D系数投影,进而对产生的1-D信号做增强处理.实验结果表明,该方法在提高医学图像对比度、改善图像质量的同时有效地解决了传统算法中难以克服的噪声放大和清晰边缘过增强等问题,处理后的图像更利于医生进行分析诊断和医学影像的后续处理.
재영상적의학진단중,위료종도상중알굴출진가능다적결책신식,수요유효적도상증강산법.재분석인안시각특성적기출상,침대소파불능"최우"표시함선、면기이적이유도상적문제,제출료기우궤하다척도방향창적도상증강산법.이용도상적궤하특정,재소파역중화분출동질창화결구방향창.수선재동질창내억제조성;연후계산출결구방향창적황하방향,재연창방향작2-D향1-D계수투영,진이대산생적1-D신호주증강처리.실험결과표명,해방법재제고의학도상대비도、개선도상질량적동시유효지해결료전통산법중난이극복적조성방대화청석변연과증강등문제,처리후적도상경리우의생진행분석진단화의학영상적후속처리.
In the image-based medical diagnosis,effective image enhancement algorithm is required to dig decision-making information from image as much as possible.Because the wavelets fails to provide the optima representation of two-dimensional image with the "linear" or "face" singularity,on the basis of analyzing the human vision sproperties,a image enhancement algorithm based on the geometrical adaptive directional windows is presented.The wavelets domain is divided into the homogeneous windows and the structure geometrical windows by the use of geometrical characteristic of image.Firstly,the noise is restrained in the homogeneous windows;then the geometrical direction of the structure directional windows is computed,and 2-D information is projected on the 1-D along the certain directions,thereby 1-D signal is managed by wavelet transform for enhancement.The results of experiments show that the proposed algorithm not only can advance the contrast of image and improve the quality of image but also can resolve the problem of the noise magnified and extra-enhancement of dear edge, which is hard to process in the conventional algorithms.The handled image is advantageous for the doctor to carry on analysis diagnosis and follow- up processing of medical images.