TTC估计系统误差分析及修正

在运动图像序列中利用目标稳定的特征点进行跟踪，从而计算目标尺度变化率以进一步进行TTC（Time-To-Contact) 估计，是目前应用较多的被动测距方法，但由于图像的离散化采样，在图像中进行尺度测量不可避免地带来了很大的误差，本文在对TTC估计系统进行了一系列误差分析后，根据TTC系统的特点对TTC估计结果进行一元线性回归修正，以提高估计精度和抗干扰能力，实验结果证明了该方法的有效性。

Error Analysis & Correction in TTC Estimation System

In visible light field,good results can be obtained by line length change rate,where the image feature points are stable,and can be traced between serial frames. However,due to discrete sampling,errors ensued when trying to measure line length in images. In this paper, after a series of error analyses, a new correction method of Time -To- Contact estimation is presented,where weighted method and simple regression analysis are used.Finally results of experiments are given to confirm the correctness of this method.