Face Tracking Using Webcam

Topics: Facial recognition system, Face, Kalman filter Pages: 9 (2796 words) Published: April 23, 2007
Real Time Face Tracking Using Web Camera


This paper, presents a real time object tracking system under various conditions such as changes in lighting, object speed and background. This system is developed in order to achieve a robust, low cost surveillance system that can replace the more expensive CCTV systems available. Many of these devices provide fixed, poor, low-resolution images that are not very reliable and cannot be used for further applications. We have implemented a real time object tracking system using a web camera mounted on a pan-tilt base that is able to perform horizontal and vertical motions. Experiments have shown good tracking results for most conditions, except in poor lighting conditions and when tracking fact moving objects.

Among the many fields of computer usage, one that is gaining much attention over the last two decades is remote monitoring and surveillance [1]. Computers are now being used in places where it is difficult or unsafe to place a human being.

Remote surveillance and security monitoring devices are becoming increasingly popular in the world today. Remote surveillance is widely used in the monitoring of restricted areas, hazardous environments, unfriendly territory, and many others. With the recent threats to security in countries throughout the world, it is also desirable to have remote monitoring devices in places such as airports, government buildings, prominent buildings and so on.

Real-time Object Tracking refers to the use of special purpose computer vision hardware and software to follow up on the motion of objects detected in dynamic scenes at rates which are high enough to be used in surveillance systems or decision-making, in real-world situations. Many applications have been developed for monitoring public areas such as offices, shopping malls or traffic highways. In order to control normal activities in these areas, tracking of pedestrians and vehicles play an important role in video surveillance systems.

A number of researchers have carried out a considerable amount of work in the area of object tracking. A large number of this work concentrate on tracking of objects in a video stream. There is still a lot of room for improvement in the area of real time object tracking in a real world environment.

Nelson [2] addresses the problem of identifying independently moving objects from a moving observer - an active vision system. He proposes two methods, one making use of information about the motion of the observer and the second using knowledge about how certain independently moving objects move. The first method, known as constraint ray filtering, is based on the idea that in any rigid environment, the projected motion of any point is constrained to lie on a one dimensional locus in the velocity space whose parameters depend only on the motion of the observer and the location of the image point. The second technique, called animate motion, uses the concept that the motion of the observer is generally slow and smooth, whereas the apparent motions of independently moving objects are comparatively changing more rapidly.

Betke et al [3] have developed a system that recognises and tracks multiple vehicles from sequences of gray-scale images taken from a moving car in ``hard'' real-time. Recognition is accomplished by combining the analysis of single frames with that of motion information provided by multiple consecutive frames. In single frames, cars are recognised by matching deformable gray-scale templates after detecting image features such as corners and by evaluating how those features relate to each other. They are also recognised by differencing consecutive frames and by tracking motion parameters typical for cars.

Sinclair et al [4] made use of image velocity in deriving their segmentation algorithm. They offer a novel means of segmenting independently moving objects from rigid backgrounds. One of the...
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