计算机仿真
計算機倣真
계산궤방진
COMPUTER SIMULATION
2009年
12期
182-185
,共4页
单目视觉%针孔成像模型%圆锥曲线拟合%测量精度
單目視覺%針孔成像模型%圓錐麯線擬閤%測量精度
단목시각%침공성상모형%원추곡선의합%측량정도
Monocular vision%Pinhole imaging model%Conical section fitting%Ranging accuracy
针对传统单日视觉测量精度不高,尤其是深度方向测量精度较差的缺点,建立了球体针孔成像模型,提出了一种基于圆锥曲线拟合的球体成像边缘哑像素定位方法,可求出圆形目标的中心和半径,再同过统计目标边缘点到圆心的距离均值和方差,通过3σ原则剔除野值,再进行一次拟合进一步提高精度.实验表明,方法边缘定位精度为0.02pixel.直径为40mm的球体在1m范围内成像,平行于像平面方向上测量误差小于0.2mm,沿光轴方向小于0.6mm.
針對傳統單日視覺測量精度不高,尤其是深度方嚮測量精度較差的缺點,建立瞭毬體針孔成像模型,提齣瞭一種基于圓錐麯線擬閤的毬體成像邊緣啞像素定位方法,可求齣圓形目標的中心和半徑,再同過統計目標邊緣點到圓心的距離均值和方差,通過3σ原則剔除野值,再進行一次擬閤進一步提高精度.實驗錶明,方法邊緣定位精度為0.02pixel.直徑為40mm的毬體在1m範圍內成像,平行于像平麵方嚮上測量誤差小于0.2mm,沿光軸方嚮小于0.6mm.
침대전통단일시각측량정도불고,우기시심도방향측량정도교차적결점,건립료구체침공성상모형,제출료일충기우원추곡선의합적구체성상변연아상소정위방법,가구출원형목표적중심화반경,재동과통계목표변연점도원심적거리균치화방차,통과3σ원칙척제야치,재진행일차의합진일보제고정도.실험표명,방법변연정위정도위0.02pixel.직경위40mm적구체재1m범위내성상,평행우상평면방향상측량오차소우0.2mm,연광축방향소우0.6mm.
Aimed at the problem of low precision of traditional monocular vision, especially along the optical axis direction, a pinhole model of sphericity is established and a method of sub-pixel position of spheric targets based on conical section fitting is presented. The experiment results indicate that the edge of spheric targets can be located in 0.02pixel by this method. The ranging error in the plane vertical to the optical axis direction is less than 0.2 mm and less than 0. 6mm along the optical axis direction when the diameter of the sphericity is 40mm and object distance is less than 1 m.
