Intelligent Video Analysis Technology Port Application
The video surveillance system of the existing ports in China is mainly composed of cameras, optical cables, matrixes, hard disk recorders, and video walls. Due to the large number of video surveillance images and boring contents, the existing systems, even with on-duty personnel, are still in an unattended state in most cases.
When a crime incident occurs, the retrieval of video playback and forensics from the DVR becomes one of the major values of the system. Even if on-duty personnel are on duty, due to the physiological characteristics of human beings, it is impossible to effectively observe multi-channel images for a long time, which may result in the omission of suspicious events and misjudgment of safety forms.
Intelligent video surveillance technology can be understood as using a computer to help watch people watch video surveillance. The high reliability of modern computers can provide 24-hour protection. Fundamentally eliminate the omissions caused by fatigue. At the same time, it is also possible to prevent the possibility of colluding inside and outside the monitoring staff.
The existing intelligent video analysis technology cannot replace people. It still needs people to recognize the nature of the alarm and decide the disposal method. Its value lies in greatly reducing the intensity of the monitoring personnel's work and making the quality of monitoring a qualitative improvement. Compared with traditional video surveillance systems, intelligent video analytics can detect or even prevent crimes from occurring. The significance of this sensitive and critical infrastructure such as the port is obvious.
The function of intelligent video analysis technology and its application in ports
The demand for video surveillance systems in domestic ports is mainly due to the need for theft prevention, production safety, and anti-terrorism. The valuable materials in the port and the surveillance of key departments are typical application scenarios.
Since China signed the Sonus Convention, all ports exported to the United States must meet certain security standards. At the same time, as an important part of the national economy, the port’s anti-terrorism has also been incorporated into the agenda by major domestic ports.
The main function
Currently, intelligent video analysis systems on the market generally have the following functions:
1, image acquisition / interface. The vast majority of intelligent video analysis algorithms are based on non-compressed image formats such as RGB or YUV, so image signals are sent directly to the video analysis unit without being compressed after being captured. Almost all video analysis systems are equipped with an image capture function, usually through the BNC input analog image signal. The image signal in the existing image monitoring system usually exists in the form of a compressed image stream, and the image stream can be decompressed and restored to the original image format before analysis.
2, moving object detection. In simple terms, motion detection is the discovery of moving objects in an image. Moving objects can simply be defined as changing parts of an image. Some elementary motion detection algorithms are based on these concepts. The false alarm rate of such methods is too high to be suitable for real-time alarm systems.
Not all changes in the image are moving objects that we are interested in. For example, changes introduced by the camera itself include pixel noise, overall brightness changes caused by the camera's auto iris control circuit, and high- and low-frequency periodic noise signals introduced in image transmission. , mutations caused by infrared camera cycle calibration. Changes introduced by the external environment include rapid changes in the ground light in cloudy weather, shadows of moving objects, waves or sparkling phenomena on the water surface, swinging of branches on land, halo caused by headlights at night, and rain and snow weather.
In addition, the camera shakes easily on windy days, especially high light poles. The image changes caused by these phenomena should be filtered out. They can be solved by algorithms or other technical means.
Home Previous Next Last From the point of view of the algorithm, it can be simply divided into two categories. One is to establish a background model and find the moving object by comparing it with the background model. The other type is to find moving objects through the optical flow method by finding the effect of moving objects on the optical flow field. The other is a method that combines the two or a combination of the two.
3, multi-object tracking. Tracing is essentially stringing together the same objects found on each frame in chronological order. This area itself is a relatively independent and active research area. The main research direction is to effectively track under complex circumstances such as multiple moving objects, multiple cameras, moving objects blocking each other, disappearing and recurring.
In practical monitoring applications, especially for some intrusion alarm application cases, the requirements for tracking algorithms are relatively low. The existing system does not have satisfactory tracking effects on moving objects and other complex application scenes. However, with reference to the pace of technological development in the past, this aspect will soon be perfected.
4, behavioral characteristics analysis. The behavioral feature analysis is to look for an event that meets a predetermined behavioral characteristic from the image. Typical applications on the market today include:
(1) Classification. Judging that the moving objects are people, cars, boats, airplanes. Stop or abruptly accelerate, such as when a vehicle is anchored in a tunnel or on a highway, a scene of a robbery on the street, and a chance to escape.
(2) Hey. Persons who are observed outside the sensitive area. Pedestrians and vehicles that pass normally are not alerted.
(3) Leftovers. Place explosives at airports, oil depots, etc. and leave.
(4) The item is missing. If the museum’s valuable exhibits discover the disappearance of exhibits, the system will immediately call the police.
(5) Statistics of the number of people. For example, statistics are made on the number of people entering supermarkets and other places, and the average consumption curve of one day is plotted against sales data.
(6) Population density. Such as when the alarm when the number of personnel is too large, or when the crowd suddenly spread out anomalies occur when the alarm.
(7) The staff fell to the ground. For example, when the staff suddenly changes from straight to flat.
In general, intelligent video analytics can do a lot of things and require video analytics developers and end users to communicate effectively. As intelligent video analysis is still a relatively new technology, the circle that knows this technology in the country currently only expands to the integrator level. Many application scenarios suitable for video analysis technology have yet to be developed in the market. However, one thing is clear: companies must master core technologies and have independent research and development capabilities. The intelligent video analysis market is composed of many subdivided small markets, and new applications are constantly emerging.
5, set the alarm conditions. The introduction of intelligence in video surveillance has greatly enriched the monitoring content. Currently available alarm elements include areas, time periods, object types, dimensions, direction of movement, speed, behavioral characteristics, and many other things.
6, alarm linkage. After the abnormal situation is found in the intelligent video analysis system, it is usually necessary to verify the authenticity of the alarm, such as detailed investigation of the close of the alarm event by another PTZ camera, or promptly notify and remind the monitoring personnel. Common real-time prompt methods include voice, pop-up images, sending text mesغير مجاز مي باشدes, screenshots and other means to prompt monitoring personnel.
Special function intelligent video analysis can also solve the special needs of the port
Especially in the area of safety production. For example, in the illegal parking of container yard roads, the container trucks are not allowed to park under the bridge cranes, and the coal yard is burning spontaneously. Since intelligent video analytics technology itself can be applied to many fields, communication between ports and video analytics companies can bring many new problems to the port.
Special problems encountered
Compared with other smart video analysis application scenarios (eg, prisons, power plants, banks, vital organs, etc.), the port project has the following difficulties that require attention:
1, a large range
The perimeter of the port is usually a few kilometers or more. It is usually relatively empty. The available installation points do not necessarily meet the requirements of a typical intelligent video analysis system. This is mainly due to the fact that the typical detection distance of existing products is usually in the range of tens of meters, and individual manufacturers can do farther. Technically, it is mainly the conflict between resolution and processing power. If the resolution is too high, some low-end systems cannot process such a large amount of image data in real-time due to the increase in the amount of data. For the port, analysis using D1 (704 times 576) images is often encountered.
2, camera shake
Since the port is usually open and faces the sea or river, camera shake is certain. Even if the camera is fixed on a very thick lamp pole, shaking cannot be avoided on a windy day. For a fixed camera using the background model method, camera shake must be effectively compensated before it can be used, otherwise a large number of false alarms will be generated.
3, surface waves, reflective
The above technical difficulties are solved in some existing commercial systems. Therefore, when selecting the system, you must identify it.
When monitoring the waters of a dock, such as intrusion of a small raft, if it does not properly handle the sparkling phenomenon caused by water wave and sun reflection, it will cause a large number of false alarms.
Technology development trend
Intelligent video analytics is at an early stage both in terms of technology and market maturity. Some new products and new features continue to emerge. In general, foreign countries have a wider range of applications than the domestic market; there are fewer domestic independent R&D manufacturers and more manufacturers integrate foreign systems. In the long run, the development of video surveillance systems in the direction of intelligence is increasingly being recognized by government agencies, integrators, and end users. How to choose the time to enter the market, and to use intelligent video analysis technology to improve the port security level, and then to improve the owner satisfaction and find a mature technology to achieve a balance between the port security department needs to consider their own situation.
Aluminum
Spindle Assembly is a crucial part for your lawn
mower cutting deck that work together with the pulleys and belts to
perform clean and even mowing.
It is combined from bearings, spindle housings, spindles, tubes, dust cap, screw nuts, etc.
Which kind of spindle assembly does QFQP
produce?
We produce various kinds of spindle
assembly, especial for riding mower (with aluminum/ductile
iron housings). All parts assembled by our experienced workers.
Where are the products sold?
Main of our customers is from USA, CANADA.
Why choose QFAP?
We have specialized in producing high
precision mechanical parts more than 10years, got 6years experience on mower deck spindle assembly.
All of our cooperators are large mower
companies or agricultural equipment companies, such as Badboy Mowers,
Wood-Mizer, Caterpillar, etc.
Because of the long term cooperation, we
could supply our customers not only the products but also our recommendation on
the designs to saving غير مجاز مي باشدts.
Aluminum Spindle Assembly,Aluminum Spindle Shaft Assembly,Aluminum Spindle Axle Assembly,Aluminum Spindle Cartridge Assembly
SHAOXING QIFENG AUTO PARTS CO., LTD. , https://www.sxqfap.com
برچسب: ،