JPH0536600U - Moving object detector - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to eliminate a malfunction of a moving object detection device that provides a limited detection area in a captured image, detects a change in luminance in this area, and outputs a signal. To do. [Structure] With two or more detection areas, the order in which brightness changes occur and the delay time can be set as an alarm signal output condition, and an alarm output is output only when a brightness change occurs according to the set conditions. The object detection device includes a condition input unit and a determination unit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a movement that outputs a signal by shooting a specific area outdoors such as a road with a TV camera, providing a limited detection area in the captured image, and detecting that a brightness change has occurred in this area. The present invention relates to an object detection device.

[0002]

[Prior Art]

 For work vehicles that move slowly along the roadside on an expressway, detectors and alarms may be used to inform the driver and passengers of the work vehicle that there is a general vehicle approaching at a higher speed from behind. there were. In this case, some of the detectors used a laser beam, and some used image processing technology that simply detected the change in brightness of a specific part in the monitor image by the TV camera.

[0003]

[Problems to be solved by the device]

 In a detector using a laser beam, the straightness of the beam becomes a problem in a work vehicle moving on a curved road, and the output of the laser beam is increased to maintain the sensitivity in rainy weather or in deep fog. The negative impact on human eyes becomes a problem. On the other hand, with image processing, it is possible to detect changes in the brightness of the entire screen in fine weather and in rainy weather, and white lines and walls on the road surface in the images taken from a moving work vehicle and the movement of trees in the median strip. There were many changes in brightness due to movements other than the intended vehicle, which caused malfunctions.

[0004]

[Means for Solving the Problems]

 In a screen shot by a TV camera mounted at a high place and directed downward, the movement of a vehicle approaching from a distance moves downward from above in the image. Show. The present invention has been made paying attention to the above points, and is provided with two or more detection areas, and the order of occurrence of luminance change and the delay time in these detection areas can be matched with a preset pattern. It is intended to output an alarm output.

[0005]

【Example】

 FIG. 1 shows the configuration of the moving object detection device of the present invention. The image signal obtained by the camera 1 is displayed on the monitor 7 via the image processing unit 2. On the screen displayed on the monitor 7, four limited parts (hereinafter referred to as markers) set to detect a change in brightness are displayed. The image processing unit 2 receives an input from the marker setting unit 6 that adjusts the positions of these markers on the screen, and allows the markers to be moved to arbitrary positions.

The alarm output condition input unit 5 is an input unit for presetting the order in which the four markers are to be output and the time delay and the time when the luminance is changed. This alarm output condition input unit 5 having four switches (not shown) of SW1 to SW4 and a delay time setting volume (not shown) is connected to the image control unit 2, and the alarm output condition is stored here. To be done.

The determination unit 3 determines whether or not a preset alarm output condition and a brightness change pattern obtained by the image signal obtained from the camera 1 match, and outputs if they match. The alarm output is output from the part 4.

FIG. 2 shows an image displayed on the monitor and four markers (M1 to M4). By turning ON any one of the four switches of the alarm output condition input section 5, the order of the markers as the condition for performing the alarm output is determined. For example, when SW1 is turned on, it is determined whether or not the brightness change has occurred at the position of the marker M1. When SW2 is turned on, it is determined whether the marker M2 has changed in brightness within a fixed time (1 to 5 seconds) that is adjustable by the delay time setting volume after the marker M1. When SW3 is turned on, it is determined whether or not a change in luminance has occurred in the marker M2 after the fixed time, the marker M2 after the fixed time, and the marker M3 after the fixed time. Similarly, when the SW4 is turned on, it is similarly determined whether or not the luminance change has occurred in the markers M1 to M4.

FIG. 2 shows a screen showing a state in which the rear side is photographed from a work vehicle moving on a roadside zone of an expressway. A general vehicle approaching from the rear moves from the top to the bottom of the screen in the order of the markers M1, M2, M3, and M4. When only the switch SW3 of the alarm output condition input unit 5 is turned on and the delay time is set to 5 seconds, the alarm output is output from the output unit 4 at the moment when the approaching vehicle reaches the marker M3 on the screen. If a warning device such as a buzzer is driven based on this output signal, it becomes possible to notify the driver of the work vehicle that a general vehicle is approaching.

It takes a longer time to output an alarm signal when the switches SW2, SW3, and SW4 are turned on than when the switch SW1 is turned on among the switches of the alarm output condition input unit, and it is close to The alarm signal will not be output until the vehicle approaches, but the possibility of malfunction can be reduced accordingly.

The white line and the tree in the median strip in the screen of FIG. 2 taken from the moving work vehicle even when there is no ordinary vehicle move to the upper right from the lower left of the screen. However, since the luminance change due to these movements does not occur sequentially from M1 to M4, no alarm output is emitted.

[0012]

[Effect of the device]

 As described above, in the moving object detection device of the present invention, the brightness change generated by the object moving on the screen is obtained as an alarm output after being selected by a plurality of markers according to the order and delay time setting. It was possible to reduce malfunctions compared to the conventional method that generated an alarm output, depending on whether the brightness changed at a specific location.

It is used for rear monitoring of a work vehicle moving on a highway, and when a warning buzzer is installed in the driver's seat together with a monitor, a warning buzzer sound by a warning signal, a monitor screen, a side mirror and a plurality of means are used. It became possible to grasp the situation, and the accuracy of the rear safety confirmation was improved. It can also be used as a detection device for intrusion alarms and for detecting the distance between vehicles for general vehicles, expanding the range of applications.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a moving object detection device of the present invention.

FIG. 2 is an explanatory diagram showing markers on a captured image.

[Explanation of symbols]

 1 Camera 2 Image Processing Section 3 Judgment Section 4 Output Section 5 Alarm Output Condition Input Section 6 Marker Setting Section 7 Monitor

Claims (1)

[Scope of utility model registration request] In a moving object detection device that detects a brightness change in a limited detection area in a monitoring image and outputs an alarm signal, the moving object detection device has two or more detection areas, and an alarm signal output condition includes a brightness change in the detection area. An alarm output condition setting means for arbitrarily setting the order of occurrence and delay time, a determination means for determining whether or not a brightness change has occurred as set, and an output section for outputting an alarm signal based on the determination A moving object detection device characterized by the above.