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Operation
The basic operation requires that the camera should follow an
object to closely monitor the movement of the object. This kind
of movement is achieved by using a digital signal processor used
for processing the signal from the camera and a servomotor
system that will move the camera to keep the track of the
object. It uses high speed Blackfin DSP (32 bits 300MHz) and
horizontal and vertical servo system. To understand the
operation we can take the example of a cricket ball in the
field. To track the ball DSP BF535 is loaded with the software
written for the cricket ball that has the specification of the
ball (size, shape and color). The system is first of all
initialized with the starting position of the ball, which can be
either stump.
The camera view
The digital camera comes into action, as soon as the bowler
throws the ball and keeps on calculating the coordinates of the
ball with the help of special software written for the ball,
after that it calculates the horizontal and vertical movement in
the Professional camera to capture the ball. The signals
corresponding to these movements are given to the motor system.
For proper operation the movement of the camera should be quick
and smooth. The probability of detection is dependent on a
number of things like angular speed, angular acceleration of
camera, processing speed of DSP and the accuracy of the software
used to calculate the coordinates of the ball. The tracking can
be further improved by using more than one camera to capture the
ball. The software is designed for a particular object and hence
new software is required according to the object to be tracked.
The proper initialization of the camera is also important so
that after tracking the camera comes into correct initial
position. The bearing movement of the camera is 150o and
vertical motion is –15o to +85o.This give the camera a large
view area. The cameras are placed around the field so that they
can capture the ball in the complete area of the field. As the
cameras are working automatically the error due to any human
negligence in eliminated. The camera makes the work of cameraman
very easy, as now they don’t have to move the camera to capture
the picture.
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