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本文在Reichardt的甲虫相关运动检测模型的基础上,提出了可在工程上实现的多通道运动检测器模型。该模型可以在较宽的速度范围内实时测量图象运动的方向及横向角速度,它不仅可以测量有明显边缘轮廓图象的运动,而且可以检测和测量无边缘轮廓的纹理状图象的运动。文中对模型各环节参数的选择进行了讨论,得到下述结论: 1.低通滤波环节的时间常数与可检测速度的范围有关;我们可以由两个接收器的空间间隔d,测速下限对应的延迟时间t_a与测速上限对应的延迟时间t_b以及测速精度的要求来确定低通滤波环节的时间常数τ_L。2.高通滤波环节与低通滤波环节时间常数的比值也与可检测速度范固有关,高通滤波环节时间常数τ_H越小,可检测速度上限越高。3.相关器的采样时间T≥1/2ε~2×[τ_L+2t_a+2)。4.由N个不同间距通道组成的运动检测器组,可检测速度覆盖的范围扩大为■,其中第k个通道中两个采样器的间距为d_k=d_0×(t_a/t_b)~k k=0,1,…N
Based on the Reichardt’s beetle-related motion detection model, this paper presents a multi-channel motion detector model that can be implemented in engineering. The model can measure the direction of the image motion and the lateral angular velocity in real time over a wide speed range. It can not only measure the motion of the image with the obvious edge profile, but also detect and measure the motion of the texture image without the edge profile. In this paper, the parameters of the model are discussed. The following conclusions are obtained: 1. The time constant of the low-pass filter is related to the range of detectable speed. The spatial distance d between two receivers, The delay time t_a, the delay time t_b corresponding to the upper speed limit, and the requirement of speed accuracy to determine the time constant τ_L of the low-pass filter. 2. The ratio of high-pass filter and low-pass filter time constant is also related to the detectable speed range. The lower the high-pass filter time constant τ_H, the higher the detectable speed upper limit. 3. Correlator sampling time T ≧ 1 / 2ε ~ 2 × [τ_L + 2t_a + 2). 4. The motion detector set consisting of N different pitch channels, the range of detectable speed coverage is expanded to ■, where the distance between two samplers in the kth channel is d_k = d_0 × (t_a / t_b) ~ kk = 0,1, ... N