To satisfy the Nyquist criteria for image resolution, each pixel
of the image shown on the LCD should be sampled by 2 or more
pixels in the camera [12]. The image sensor uses limited number
of bits per channel for conversion of each color pixel, resulting
into quantization noise. To limit the effect of this noise on the
overall detection performance it should be maintained dB
below system noise level [13], which on the other hand must
be maintained well below signal power level, depending on the
modulation method used, in order to have acceptable bit error
rates (BER) [14].