fexpoadapt HEADAS help file

NAME

fexpoadapt -- Adaptively smooth an image and an exposure map together.

USAGE

        fexpoadapt image expomap smooth mincounts [minexpo]

DESCRIPTION

This is a boxcar smoothing program that works on an image and the exposure map associated with it simultaneously. A pixel with exposure less than 'minexpo' (typically 0) is set to 0; otherwise, this accumulates values from surrounding pixels until it has at least 'mincounts' counts. The total is then divided by the total of exposures accumulated from the same pixels.

PARAMETERS

image [filename]

Name of input image file to be smoothed.

expomap [filename]

Name of exposure map file to be used with the above.

smooth [filename]

Name of output image file (smoothed and exposure corrected).

mincounts = 50 [real]

The minimum number of counts per cell.

minexpo [real]

The minimum exposure time below which a pixel is rejected. It can be used, e.g., to exclude low-exposure regions at the edge of the detctor from the output.

EXAMPLES

1. Smooth gis.img, with associated exposure map gis.expo, to contain a minimum of 100 counts per cell; output the result into gis_smooth.img

                  ex> fexpoadapt gis.img gis.expo gis_smooth.img 100

BUGS

This tool has not been tested extensively except on ASCA images.