| | 2 | |
| | 3 | == March 22, 2012 == |
| | 4 | |
| | 5 | Normalized single-detection x-position CDF plots for all exposures used in the czw.footprint.dark test: |
| | 6 | |
| | 7 | [[Image(col0.png,400px)]] |
| | 8 | [[Image(col1.png,400px)]] |
| | 9 | |
| | 10 | [[Image(col2.png,400px)]] |
| | 11 | [[Image(col3.png,400px)]] |
| | 12 | |
| | 13 | [[Image(col4.png,400px)]] |
| | 14 | [[Image(col5.png,400px)]] |
| | 15 | |
| | 16 | [[Image(col6.png,400px)]] |
| | 17 | [[Image(col7.png,400px)]] |
| | 18 | |
| | 19 | Example NOISEMAP detproc image showing the gradients in observed noise as a function of OTA/cell/position. The cells that show jumps in the above CDFs also have gradients in the image noise as shown below. |
| | 20 | |
| | 21 | [[Image(o5722g0021d.detproc.png,800px)]] |
| | 22 | |
| | 23 | == March 21, 2012 == |
| | 24 | |
| | 25 | As the observed image noise does not match the noise model as stored in the variance image, a noisemap detrend is being constructed to include the correct position dependent noise. This noisemap measures the local pixel sigma on a 20x20 grid of positions across each cell. Bias frames are used for this measurement, as they do not have any sky or dark signal that would influence this measurement. This noisemap is then used in the processing of science images instead of the read noise, as the direct measurement includes any read noise that would be observed. |
