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Buglog #178

  • Tuesday, August 18 1992 @ 05:31 PM GMT
  • Contributed by:
  • Views: 1,115
MODULE: images.fmedian
SYSTEM: V2.9
NUMBER:	178
MODULE:	images.fmedian
SYSTEM:	V2.9
DATE:	Tue Aug 18 11:31:49 MST 1992
FROM:	davis

BUG:	The fmedian task can crash with a segmentation violation or a
	floating operand error if image pixel to integer mapping is turned
	off (hmin = zmin and hmax = zmax) and the input image contains
	data outside the range defined by zmin and zmax. The bug is not
	seen often because for most ccd images the data is between -32768
	and 32767.

STATUS:	The bug is fixed in 2.10.1. The work-around is to either let zmin and
	zmax default to the image minimum and maximum or set hmin and hmax
	to numbers that are slightly different from hmin and hmax.

NUMBER:	327
MODULE:	apphot interactive tasks
SYSTEM:	V2.10.3 and later
DATE:	Mon Feb 12 14:37:55 MST 1996
FROM:	davis

BUG:	The m keystroke command was performing a 'measure next object'
	operation (the n keystroke command) instead of a 'move to next
	object operation' as intended.

STATUS:	Fixed for the next release of iraf. The work around is to use the :m
	keystroke command.

NUMBER:	450
MODULE:	imfilter.fmedian,imfilter.frmedian,imfilter.fmode,imfilter.frmode
SYSTEM:	V2.11
DATE:	Fri Nov 19 14:20:16 MST 1999
FROM:	davis

BUG:	The fast median / mode filtering tasks will overflow producing
	pathological pixel values if the size of the filtering kernel
	xfilter * yfilter > 32767 and the number of pixels in 1 histogram
	bin happens to be > 32767 as may happen in bad pixel regions.

	The problem was due to the fact that for historical reason the
	algorithm histogram was stored as a short instead of an int.

STATUS:	Fixed for 2.11.3. The workaround is to try and keep the filter size
	< 32767 pixels in size, or to use the much slower median task.

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