公开(公告)号：US5444442A

公开(公告)日：1995-08-22

申请号：US143119

申请日：1993-10-29

申请人： Mareo Sadakata ,  Yoichiro Iwasaki ,  Yoshiharu Yano ,  Masakazu Toyama

发明人： Mareo Sadakata ,  Yoichiro Iwasaki ,  Yoshiharu Yano ,  Masakazu Toyama

IPC分类号： G08G1/00 ,  G08G1/01 ,  G08G1/04 ,  G08G1/08 ,  G08G1/07

CPC分类号： G08G1/08

摘要： A method for predicting a traffic flow rate at a point on a road to control a traffic light signaling system measures a traffic density on the road to predict a traffic flow rate by utilizing the fact that a velocity of a vehicle on the road is restricted by an interval between successive vehicles, since the traffic density is locally increased when the vehicle interval is not uniform and therefore the spatial mean speed is lowered. This method offers higher accuracy by utilizing a correction coefficient obtained from an actual vehicle distribution, for instance, a coefficient derived from entropy. An apparatus for controlling a traffic light signaling system installed on a point of a road by utilizing this predicting method, thereby smoothing a traffic condition, includes video cameras for picking up images of a traffic condition at an upper stream of an intersection, an A/D converter for converting an analog video output signal into a digital video signal, two sets of image memories for storing digital image data about two scenes imaged by the video cameras at a proper time interval, an image processing unit for extracting moving objects from the images, a data process/control unit for calculating a total number of vehicles within a predetermined area and each space headway, whereby a vehicle distribution pattern is recognized an a correction coefficient is calculated, and an input/output unit for interfacing with the traffic light signaling system installed on the road.

摘要翻译： 一种用于预测道路上某点的交通流量以控制交通信号灯信号系统的方法，通过利用道路上的车辆速度受到限制的事实来测量道路上的交通密度以预测交通流量 连续车辆之间的间隔，因为当车辆间隔不均匀且因此空间平均速度降低时交通密度局部增加。 该方法通过利用从实际车辆分布获得的校正系数（例如，从熵导出的系数）提供更高的精度。 一种用于通过利用该预测方法来控制安装在道路点上的交通信号灯系统的设备，从而平滑交通状况，包括用于拾取交叉路口上游交通状况图像的摄像机，A / D转换器，用于将模拟视频输出信号转换为数字视频信号;两组图像存储器，用于存储关于由摄像机以适当的时间间隔成像的两个场景的数字图像数据;图像处理单元，用于从图像中提取运动对象 数据处理/控制单元，用于计算预定区域内的车辆总数和每个空间前进距离，由此车辆分配模式被识别为校正系数;以及输入/输出单元，用于与交通信号灯信号 系统安装在路上。

公开(公告)号：US4016568A

公开(公告)日：1977-04-05

申请号：US537767

申请日：1974-12-31

申请人： Mistuo Makimoto ,  Sadahiko Yamashita ,  Yoshiharu Yano ,  Junichi Yamamoto

发明人： Mistuo Makimoto ,  Sadahiko Yamashita ,  Yoshiharu Yano ,  Junichi Yamamoto

IPC分类号： B60R21/00 ,  G01S13/58 ,  G01S9/44

CPC分类号： G01S13/585

摘要： A beam of diverging electromagnetic radiation of a predetermined frequency is transmitted to a target and the doppler shift of frequency of an echo due to relative movement of the target and a point of reception is detected conventionally by combining the frequency of the echo and the predetermined frequency. The number of cycles within the detected doppler shift frequency is counted to provide a delay to initiate measurement of doppler shift at a preselected angle of incidence of the echo. The effective area of measurement is thus restricted to a narrow region of the beam with the resultant high degree of precision.

摘要翻译： 将预定频率的发散电磁辐射束发射到目标，并且通过将回波的频率和预定频率组合来检测由于目标和接收点的相对移动引起的回波频率的多普勒频移 。 在检测到的多普勒频移中的周期数被计数以提供延迟以在回波的预选入射角度开始测量多普勒频移。 因此，有效的测量区域被限制在光束的窄区域，从而产生高精度。