基于动态轮廓线的面积测量新方法

A Novel Area Measurement Approach Based on Dynamic Contour

提出了一种适用于具有光滑且不规则形状边缘的物体表面积计算的测量方法。使用一种新颖的形心自标定技术,利用图像目标形心和双频激光器测量出像素的尺寸当量,从而准确测量出真实物体的表面积。实验表明该方法的平均计算误差达到了±0.5%。和传统的面积测量方法相比,这种方法具有很强的鲁棒性,特别适用于目标图像背景中存在各种噪声和目标内部具有复杂边缘的面积计算。

A novel approach to an object＇s surface area measurement ts proposed. It is suitable for area computation of an object with smooth and irregular edges. This approach consists of 4 steps. Firstly, a photoelectric tmage collimation system is applied to obtain a target image of a detected object. Secondly, a dynamic contour converges to the target contour edge from an initial position via feature search and iteration algorithm. Thirdly, two formulas for the area and centroid computation of a closed B-spline curve are applied to compute the image target＇ s area and centroid exactly. Finally, a novel centroid-self-calibration technology is applied. It measures the pixel＇s size equivalence with the computed centroid and two-frequency laser to measure the true object＇s surface area exactly. Experiments indicate that this approach＇ s average error can decrease to ±0.5%. Compared to conventional area measurement approaches, this approach is robust for area computation in a background image with noises or for a target with many internal complicated edges.