计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
14期
168-171,175
,共5页
亚像素%一阶差分%边缘检测%梯度方向
亞像素%一階差分%邊緣檢測%梯度方嚮
아상소%일계차분%변연검측%제도방향
subpixel%first order difference%edge detection%gradient direction
提出了一种基于梯度方向的改进型一阶差分亚像素边缘检测方法。该方法的主要思想是，在曲线轮廓上，根据方位角对边缘像素点所在的小邻域沿梯度方向进行差分，再将修正值重投影至行列。理论上而言，该方法可弥补传统一阶差分法在曲线边缘处由于差分分布较平坦而导致精度较低的不足。理想图像的实验结果表明，该方法对半径测量、圆心定位的精度均小于0.05像素，这比采用其他亚像素法进行半径测量时可达到的精度有较大提高。
提齣瞭一種基于梯度方嚮的改進型一階差分亞像素邊緣檢測方法。該方法的主要思想是，在麯線輪廓上，根據方位角對邊緣像素點所在的小鄰域沿梯度方嚮進行差分，再將脩正值重投影至行列。理論上而言，該方法可瀰補傳統一階差分法在麯線邊緣處由于差分分佈較平坦而導緻精度較低的不足。理想圖像的實驗結果錶明，該方法對半徑測量、圓心定位的精度均小于0.05像素，這比採用其他亞像素法進行半徑測量時可達到的精度有較大提高。
제출료일충기우제도방향적개진형일계차분아상소변연검측방법。해방법적주요사상시，재곡선륜곽상，근거방위각대변연상소점소재적소린역연제도방향진행차분，재장수정치중투영지행렬。이론상이언，해방법가미보전통일계차분법재곡선변연처유우차분분포교평탄이도치정도교저적불족。이상도상적실험결과표명，해방법대반경측량、원심정위적정도균소우0.05상소，저비채용기타아상소법진행반경측량시가체도적정도유교대제고。
The first order differential subpixel edge detection method is improved along gradient direction.According to the azimuth of each pixel located on curve edge, the difference of its surrounding domain is gained along its gradient direc-tion and the re-projection followed. Theoretically, the improved method compensates for the flaw that normal first order differential method fails to achieve a high accuracy due to the flat differential distribution along rows and columns. Experi-ments demonstrate that the accuracy of the proposed method reaches 0.05 pixel when used to detect circle center and radius, which shows its great advantage compared with the other methods.
