Trolley Scan(Pty) Ltd
Video Analysis and Recognition Systems
Video cameras and scanners have been around for a long time. The quality of the image is improving and the costs of the camera systems are reducing.
Video cameras generate a lot of data and few computer systems can process this data and extract important information from the images.
The developments at Trolley
Scan focus on developing and implementing low cost image processing systems
The solution to the problem of vast amounts of video data and relatively slow computer systems is to introduce a computer compatible device that can capture the data from the cameras and can then process parts of the image under the control of a computer which can interpret the current image and make decisions based on those elements of the picture.
Video processor for connecting between camera and desktop/laptop computer.
The video processor is connected between the camera and the computer. It captures images from coloured CCTV cameras and interfaces to the computer to transfer requested data points as needed. A software program running in the computer requests the relevant areas of interest from the processor, makes decisions about that data and then requests other parts of the data depending on those decisions. In this manner the load requirements on the computer are low and almost any older generation computer could be used.
The image on the left is what is seen by the CCTV camera 50 times per second. This image has a lot of data on areas that we are not interested in watching, such as activity on the open fields to the left of the roadway. Our interest is to monitor the roadway and pathway to the right of the roadway and record any passing traffic. To do this the computer software applies a mathematical equation to to the image data to determine if conditions exist requiring an image to be stored. Should this happen then only a portion of the image around the area of interest is stored with time and date stamp. The image on the right is typical of a stored image.
Higher resolution cameras can be used with smaller fields of view if details such as identity of vehicles etc are needed such as in the image below.
Selection of cameras
The installation of a CCTV system is very suitable for the Do it Yourself enthusiast. Ideally the camera should be mounted within 100 meters of the computer. The CCTV camera is attached to its mounting point and a cable (for the signal and power) is run from the camera back to the video processor. The video processor is connected to a Win32 compatible computer via a RS232 or USB port. Software is installed and setup following directions and you have an operational system.
It is also possible with the video processor and different software to monitor situations where people/items are moving around the image, such as monitoring players on a sports field. To do this the individual items/people are initially identified by looking at the entire image, and thereafter by just looking at the pixels around the people, their position is updated without having to analyse the whole picture meaning a high scan rate.
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This site is located at trolleyscan.com
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