Assume we have a \(5 \times 5\) pixel target with equal signal level at every pixel, and background clutter with equal estimated mean as well. Specifically, we set \(s_{n}=6\) and \(\widehat{\mu}_{b n}=2\) for all values of \(n\) comprising the target. What is the resulting contrast? If we set the total noise variance \(\sigma_{T}^{2}\) equal to 1 , with the background noise variance \(\sigma_{b}^{2}\) equal to 0.9 and a system noise variance \(\sigma_{t}^{2}\) equal to 0.1 , what is the resulting Contrast? Contrast noise ratio (CNR) in \(\mathrm{dB}\) ? Resulting background noise ratio (BNR) in \(\mathrm{dB}\) ?