Abstract :
In this paper we discuss about the
device capable of detecting and disabling digital cameras. The system locates
the camera and then neutralizes it. Every digital camera has an image sensor
known as a CCD, which is retro reflective and sends light back directly to its
original source at the same angle. The device shines infrared LED light, which
is invisible to the human eye, at a distance of about 20 feet. It then collects
video of these reflections with a camcorder. Then the video of the reflections
is transferred to a computer connected to the device, where it is sent through
image-processing algorithms that pick out infrared light bouncing back .
Once camera is detected, the device
would project an invisible infrared laser into the camera's lens, thereby
overexposing the photo and rendering it useless. Low levels of infrared laser
neutralize digital cameras but are neither a health danger to humans nor a
physical damage to cameras. We also discuss about the simplified design of the
above device that can used in theatres to prevent piracy. The domains being
covered here are optics and image processing.
The entire area to be protected is
scanned by using infrared light. Infrared LED is used for producing them. The
circuitry required for producing infrared beams are simple and cheap in nature.
The scanning beams sweep through the vertical and horizontal direction of the
area, to ensure no camera escapes from the device.
The area being
scanned by the infrared beams are simultaneously recorded. The preprocessing
image being acquired is called as the test image. It forms the basis of the
further steps of the process. The test image is obtained by use of high
resolution camcorders. The response of the test image capturer should be very
fast in order to sense even a small change of position of the camera. The
camcorder should have a wide angle of capture so that it can capture a wide
test image to cover the entire area. The retro reflected beams also have the
same properties of the near IR. Therefore, they are visible to the camcorders
and invisible to human eyes.
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