CAJ | 학술논문

在图像处理中,Hough 变换广泛地应用于图像空间图形的检测,是从图像中识别几何图形的基本方法之一,但是其对于除直线之外的检测基本都会涉及3个甚至3个以上的参数,导致变换过程中所使用的存储空间大,计算时间长。针对传统 Hough 变换的算法缺点,提出一种改进的 Hough 变换算法,首先对原图像进行灰度化、滤波等图像预处理,然后结合图像的结构信息缩小变换像素点所处的范围,从而大大减少计算时间。进一步再将改进的 Hough 变换应用于图像特征提取,即圆和指针的提取。最后根据圆心连线与指针的角度来对指针的读数进行判别。
재도상처리중,Hough 변환엄범지응용우도상공간도형적검측,시종도상중식별궤하도형적기본방법지일,단시기대우제직선지외적검측기본도회섭급3개심지3개이상적삼수,도치변환과정중소사용적존저공간대,계산시간장。침대전통 Hough 변환적산법결점,제출일충개진적 Hough 변환산법,수선대원도상진행회도화、려파등도상예처리,연후결합도상적결구신식축소변환상소점소처적범위,종이대대감소계산시간。진일보재장개진적 Hough 변환응용우도상특정제취,즉원화지침적제취。최후근거원심련선여지침적각도래대지침적독수진행판별。
In image processing,the Hough transform is widely used in the detection of image space graphics,which is one of the basic methods to identify geometry from the image.But it ba-sically involves three or even more than three parameters except the straight line detection,which leads to the excessive use of storage space in the process of transformation and long computing time.To overcome the weak points of the traditional Hough transform algorithm,this paper proposes an improved Hough transform algorithm.First of all,the image pre-processing is conducted,including graying and filtering of the original image.Then the narrow scope of trans-formation pixel points is reduced by combining with the structural information of image,which greatly reduces the computing time.The improved Hough transform is applied to image feature extraction,which contains the extraction of the circle and pointer.At last,the reading can be in-terpreted according to the angle between the attachment of centers of the circles and pointer.