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    • 6. 发明授权
    • Optical unit and light irradiating device
    • 光学单元和光照射装置
    • US07874714B2
    • 2011-01-25
    • US11996939
    • 2006-07-27
    • Kenji YonedaMitsuru SaitoTakuzo Togawa
    • Kenji YonedaMitsuru SaitoTakuzo Togawa
    • F21V7/06F21V8/00
    • G02B6/4292G02B6/4206G02B6/4248
    • An optical unit is provided with an integral light condensing section and a light transmitting section. The light condensing section is in a shape of a parabolic body of rotation substantially widening from a proximal end toward a distal end with a concave section opening at a proximal end face to accommodate a light emitting element, a side circumferential face to reflect the light from the light emitting element inward and a distal end face to introduce the light from the light emitting element into the light transmitting section. The light transmitting section is a substantially cylindrical shape of a smaller diameter than the light condensing section, and comprises a proximal end face to introduce the light from the light condensing section, a side circumferential face to reflect the light introduced from the proximal end face inward and a distal end face to emit the light.
    • 光学单元设置有一体的聚光部分和透光部分。 所述聚光部分是抛物线体的形状,其基本上从近端朝向远端变宽,在近端面具有开口的凹形部分,以容纳发光元件,侧面周向面以反射来自 所述发光元件向内,以及远端面,以将来自所述发光元件的光引入所述光透射部。 光透射部分是比聚光部分更小直径的大致圆柱形形状,并且包括用于引入来自聚光部分的光的近端面,用于将从近端面向内引入的光反射的侧周面 以及发射光的远端面。
    • 7. 发明授权
    • Automated estimation of average stopped delay at signalized intersections
    • 信号交叉口的平均停止延迟的自动估计
    • US07747041B2
    • 2010-06-29
    • US10948104
    • 2004-09-23
    • Mitsuru SaitoWilliam R. Hereth, Jr.Alan Zundel
    • Mitsuru SaitoWilliam R. Hereth, Jr.Alan Zundel
    • G06K9/00G08G1/017G06F19/00H04N7/00
    • G08G1/04G08G1/0104
    • A system and method for automated estimation of average stopped delay at signalized intersections using digitized still image analysis of actual traffic flow is disclosed. The system and method includes digitizing images of an intersection and creating a line of pixels that acts as a virtual sensor in a traffic lane of interest. Background intensities of the pixel line on the traffic lane without vehicles are compared to pixel intensities on images with traffic. Once vehicles are identified, the present method and system provides for three alternative embodiments of methods for determining the stopped delay for an entire image or for a particular vehicle. Once the stopped delay for all relevant images or for all relevant vehicles is determined, the average stopped delay per vehicle is estimated.
    • 公开了一种使用实际交通流量的数字化静止图像分析来自动估计信号交叉口处的平均停止延迟的系统和方法。 该系统和方法包括数字化交叉点的图像并创建在感兴趣的行车道中充当虚拟传感器的一行像素。 将没有车辆的行车道上的像素线的背景强度与具有交通的图像上的像素强度进行比较。 一旦车辆被识别,本方法和系统提供用于确定整个图像或特定车辆的停止延迟的方法的三个替代实施例。 一旦确定了所有相关图像或所有相关车辆的停止延迟,则估计每辆车的平均停止延迟。