SExSeg Usage

sexseg det.fits segm.fits <anal.fits, -C anal.sexseg, -nobacksub, -segmout, -fences, -gapval, -nooverlap>
 

Explanations:

det.fits   detection image created from best quality images

segm.fits   segmentation map (definition of objects & their borders) -- can be from SExtractor, wavelet decomposition, edited manually...

Optional:

anal.fits   analysis image (if excluded, SExSeg will analyze the detection image)

-C anal.sexseg   SExSeg input parameters in a new streamlined file format that combines the .sex & .param files.  (See an example: det.sexseg)  Contains only the relevant information.  Parameters marked by * may not be deleted.

-nobacksub   No background is subtracted from your analysis image. (Otherwise, SExSeg first runs SExtractor to subtract a background given the parameters in anal.sexseg.)

-segmout   Outputs segm_out.fits, the final segmentation map, so that you can see where SExSEg inserted gaps. (The catalog also records the number of pixels missing (if any) for each object.)

-fences   Outputs a "contour" file (ker_segm.con) which delineates objects when loaded into ds9 (SAOImage) Example

-gapval   Sets the "gaps" to a low non-zero value, in an effort to avoid discarding these pixels.  This was the original implementation, and it works fairly well.  However, occasionally a few pixels drift to a neighboring object.

-nooverlap   Set this option if you are sure your objects don't touch.  Saves the step of finding gaps.