README
1This directory contains several ASCII files related to SExtractor
2configuration:
3
4default.sex: an example of SExtractor .sex configuration file.
5default.param: a .param file, containing all parameters known by SExtractor.
6 To prevent some parameters to figure in the output catalog,
7 just erase or comment their names (by adding a # at the
8 beginning of the line).
9default.nnw: a "Neural-Network-Weights" file for star/galaxy separation on
10 images with Moffat-like PSFs.
11*.conv: several "classical" convolution masks for optimal detection:
12 - default.conv a small pyramidal function (fast),
13 - gauss*.conv a set of gaussian functions, for
14 seeing FWHMs between 1.5 and 5 pixels
15 (best for faint object detection),
16 - tophat*.conv a set of "top-hat" functions. Use them
17 to detect extended, low-surface
18 brightness objects, with a very low
19 THRESHOLD.
20 - mexhat*.conv "wavelets", producing a passband-
21 filtering of the image, tuned to
22 seeing FWHMs between 1.5 and 5 pixels.
23 Useful in very crowded star fields,
24 or in the vicinity of a nebula.
25 WARNING: may need a high THRESHOLD!!
26 - block_3x3.conv a small "block" function (for rebinned
27 images like those of the DeNIS survey).
28
29 All these convolution files are normalized by default.
30