| | 1 | This wiki describes the zoology investigations of the false positives when looking at the images (not necessarily the flags). |
| | 2 | |
| | 3 | Many of the stack skycells show a bias (more false detections on the top or bottom half of a cell). These biases tend to run horizontally on a chip and often do not continue onto neighboring chips. |
| | 4 | |
| | 5 | The stack that I investigated was stack 336346 (skycell.1316.089). I chose a square that had a lot of false detections (green), and one that did not (red): |
| | 6 | |
| | 7 | [[Image(falsedetbias.jpg)]] |
| | 8 | |
| | 9 | I then chopped the cell that had a lot of false detections into two (top half = red, bottom half blue), and divided the pixel values by the sqrt of the variance. A gaussian was fit to each of these parts, and it is in log space (y): |
| | 10 | |
| | 11 | [[Image()]] |
| | 12 | |
| | 13 | black = the cell with few false detections, |
| | 14 | blue = the bottom half of the cell with the false detections |
| | 15 | red = the top half of the cell with the false detections |
