Well lid theft detection method

Abstract

The invention discloses a well lid theft detection method. The method comprises the steps of obtaining a video sequence image containing a well lid from a monitoring device; determining an ellipse coinciding with the edge of the well lid through an image processing algorithm; performing calculation according to features in an ellipse range of the video sequence image to obtain a reference feature value; obtaining the video sequence image from the monitoring device at an interval of first preset time, and performing calculation according to the features in the ellipse range of the video sequence image to obtain a comparison feature value; performing comparison to obtain a difference value between the comparison feature value and the reference feature value, if the difference value is greater than a reference error value, adding 1 to an accumulator, and if the difference value is smaller than the reference error value, resetting the accumulator; and if a count of the accumulator exceeds a reference threshold, outputting a theft signal. According to the method, a detection algorithm provided by the invention still can perform effective identification and locating on a deformed well lid image, the detection speed and accuracy is increased and improved, the calculation complexity is lowered, and a calculation mechanism of the accumulator can effectively avoid a false detection phenomenon.

Description

technical field [0001] The invention relates to a method for detecting manhole cover theft. Background technique [0002] Manhole cover facilities are important assets of urban construction and are of great significance to urban management. However, the problem of manhole cover loss has not been effectively solved, which will cause great safety hazards to pedestrians and vehicles. Therefore, it is of great significance to study a technology that can monitor the state of the manhole cover in real time and give an alarm when the manhole cover is lost. [0003] There are two traditional solutions to this problem. One is to make the manhole cover anti-theft by improving the manufacturing process of the manhole cover, which is not conducive to theft, or directly weld the manhole cover to the road surface. The other is to add an alarm sensor device on the manhole cover. When it detects that the manhole cover has been opened illegally, the device will transmit the alarm signal to...

AI Technical Summary

Problems solved by technology

However, the problem of manhole cover loss has not been effectively solved, which will cause great safety hazards to pedestrians and vehicles

Although the above two methods can improve the situation of manhole cover theft to a certain extent, they need to invest a lot of manpower and financial resources, and further increase the cost of manhole cover theft.

Images