CAJ | 학술논문

为了能够较准确地表示图像的形状特征，提出了一种融合边界和区域信息的新的形状描述子。首先对图像进行二维离散余弦变换，获得低频系数作为区域特征。之后提取图像的轮廓并进行采样，形成描述形状轮廓的有序点列表，对每个采样点分别顺时针和逆时针等距离跟踪获得2个邻点，计算拱高以及质心距离。然后获取由拱高和质心距离组成的复函数的频域描述子，并组合区域特征与轮廓特征。对 MPEG-7标准图形库的检索实验显示，该描述子的检索性能显著优于三角形面积函数、质心距离函数与拱高半径复函数等同类描述子。
위료능구교준학지표시도상적형상특정，제출료일충융합변계화구역신식적신적형상묘술자。수선대도상진행이유리산여현변환，획득저빈계수작위구역특정。지후제취도상적륜곽병진행채양，형성묘술형상륜곽적유서점렬표，대매개채양점분별순시침화역시침등거리근종획득2개린점，계산공고이급질심거리。연후획취유공고화질심거리조성적복함수적빈역묘술자，병조합구역특정여륜곽특정。대 MPEG-7표준도형고적검색실험현시，해묘술자적검색성능현저우우삼각형면적함수、질심거리함수여공고반경복함수등동류묘술자。
A new shape descriptor with fusion contour and region information is proposed in order to represent the shape characteristics of the image more accurately. Apply two-dimensional Discrete Cosine Transform(DCT) to obtain the low-frequency coefficients as regional characteristics. Then extract and sample the contours of image, and get the ordered list of points. Track each sampling point equidistantly clockwise and counterclockwise to get two adjacent points, and calculate the arch-height and centroid distance. Construct a complex function of arch-height and centroid distance, and obtain the DCT coefficients, then combine regional and contour features. Retrieval experiments on MPEG-7 shape database show that, the retrieval performance of this descriptor is better than that of the triangle area function, the centroid distance function, and arch-height radius complex function significantly.