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    • 6. 发明申请
    • Translational Optical Flow Sensor
    • 平移光学流量传感器
    • US20090225300A1
    • 2009-09-10
    • US11681938
    • 2007-03-05
    • Geoffrey Louis BarrowsCraig William Neely
    • Geoffrey Louis BarrowsCraig William Neely
    • G01P3/36
    • G01P3/36G06T7/269G06T2207/10016G06T2207/30252
    • An optical flow sensor is presented that directly measures the translational component of the optical flow experienced by the sensor while it is on a moving platform. A prior art method of measuring translational optical flow is to simply subtract angular rates as measured by a gyro form the optical flow measurements. However this method produces noisy translational optical flow measurements resulting from lags between the gyro measurement and the optical flow measurement. In the teachings herein, translational optical flow is measured by using a gyro to measure the platform's angular rates and then incorporating these angular rates in the optical flow computations in a manner that bypasses lags in the optical flow sensor measurement. In one embodiment, individual “velocity report” optical flow measurements have their rotational component removed before these velocity reports are utilized in the remainder of the optical flow algorithm. In another embodiment, a movable window and shifting techniques are used to form a windowed image that has no rotational optical flow components. In another embodiment, an optical flow sensor is mounted on a gimbal and held to point in one direction even as the platform on which the optical flow sensor is mounted moves.
    • 提出了一种光流传感器,其直接测量传感器在移动平台上所经历的光流的平移分量。 测量平移光流的现有技术方法是简单地减去由陀螺仪测量的形成光流测量的角速率。 然而,该方法产生由陀螺仪测量和光流测量之间的滞后导致的噪声平移光学流量测量。 在本文的教导中,通过使用陀螺仪来测量平移光学流量,以测量平台的角速率,然后以绕过光学流量传感器测量中的滞后的方式将这些角速度并入光流计算中。 在一个实施例中,在光流算法的其余部分中使用这些速度报告之前,单独的“速度报告”光流测量具有其旋转分量被去除。 在另一个实施例中,使用可移动窗口和移动技术来形成不具有旋转光流分量的窗口化图像。 在另一个实施例中,光流传感器安装在万向节上并且即使当安装有光流传感器的平台移动时也保持指向一个方向。