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NOISECHISEL(1) User Commands NOISECHISEL(1) NAME NoiseChisel - detect signal in a noisy image SYNOPSIS astnoisechisel [OPTION...] ASTRdata DESCRIPTION NoiseChisel is part of GNU Astronomy Utilities 0.24. NoiseChisel Detects and segments signal that is deeply burried in noise. It employs a noise-based detection and segmentation method enabling it to be very re- silient to the rich diversity of shapes in astronomical targets. For more information, please run any of the following commands. In particu- lar the second contains a very comprehensive explanation of NoiseChisel's invocation: expected input(s), output(s), and a full description of all the options. All options and their values: $ astnoisechisel -P Inputs/Outputs and options: $ info astnoisechisel Full section in manual/book: $ info NoiseChisel Full Gnuastro manual/book: $ info gnuastro If you couldn't find your answer in the manual, you can get direct help from experienced Gnuastro users and developers. For more information, please run: $ info help-gnuastro NoiseChisel options: Input: --chdu=STR HDU/extension of convolved image in file. --convolved=FITS Convolved image file to avoid convolution. -h, --hdu=STR/INT Extension name or number of input data. --khdu=STR HDU containing kernel image. -k, --kernel=FITS Filename of kernel to convolve with input --whdu=STR HDU containing wide kernel image. -w, --widekernel=FITS Filename of wider kernel for better qthresh Tessellation (tile grid): --checktiles Tile IDs in an image, the size of input. -F, --remainderfrac=FLT Fraction of remainder to split last tile. --interpmetric=STR Interpolation metric (radial, manhattan). --interpnumngb=INT No. of neighbors to use for interpolation. --interponlyblank Only interpolate over the blank tiles. -L, --largetilesize=INT[,INT] Sim. to --tilesize, but for larger tiles. -M, --numchannels=INT[,..] No. of channels in dim.s (FITS order). --oneelempertile Display 1 element/tile, not full input res. --workoverch Work (not tile) over channel edges. -Z, --tilesize=INT[,INT] Regular tile size on dim.s (FITS order). Output: -D, --dontdelete Don't delete output if it exists. --ignoreblankintiles Don't write input's blanks in tiled output. -K, --keepinputdir Keep input directory for automatic output. -l, --label Label/count detected pixels that are connected. --outfitsnocommit No Git commit in 0-th HDU of output FITS. --outfitsnoconfig No metadata in 0-th HDU of output FITS. --outfitsnodate No 'DATE' in 0-th HDU of output FITS. --outfitsnoversions No versions in 0-th HDU of output FITS. -o, --output=STR Output file name. --rawoutput Output only detection labels & 1-elem/tile grid. --tableformat=STR 'txt', 'fits-ascii', 'fits-binary'. --wcslinearmatrix=STR WCS linear matrix of output ('pc' or 'cd'). Detection: -a, --outliernumngb=INT Num neighboring tiles to look for outlier. --blankasforeground Blanks are foreground in erosion and opening. -B, --minskyfrac=FLT Min. fraction of undetected area in tile. --checkdetection Save all the detection steps to a file. --checkdetsky Save Sky value estimation for pseudo-dets. --checkqthresh Save quantile threshold estimation in file. --checksky Final sky and its STD steps in a file. --checksn Save pseudo-detection S/N values to a file. --cleangrowndet Remove small S/N grown detections. -c, --snquant=FLT Quantile in pseudo-det. to define true. --detgrowmaxholesize=INT Max. area of holes after growth to fill. --dopening=INT Depth of opening after dthresh. --dopeningngb=INT 4 or 8 connectivity for dthresh opening. -d, --detgrowquant=FLT Minimum quant. to expand true detections. --erodengb=INT Connectivity in erosion (number of ngbs). -e, --erode=INT Number of erosions after thresholding. --holengb=INT 4 or 8 connectivity for filling holes. --minnumfalse=INT Minimum number for S/N estimation. -m, --snminarea=INT Min. pseudo-detection area for S/N dist. --noerodequant=FLT Quantile for no erosion. --openingngb=INT Connectivity in opening (number of ngbs). --outliersclip=FLT,FLT Sigma-clip params for qthresh outliers. --outliersigma=FLT Multiple of sigma to define outliers. --pseudoconcomp=INT 4 or 8 neighbors for labeling pseudo-dets. -p, --opening=INT Depth of opening after erosion. -Q, --meanmedqdiff=FLT Max. mean and median quant diff. per tile. -R, --dthresh=FLT Sigma threshold for Pseudo-detections. --skyfracnoblank No blanks in tile undetected frac. (minskyfrac). --smoothwidth=INT Flat kernel width to smooth interpolated. --snthresh=FLT Manually input pseudo-det S/N threshold. -s, --sigmaclip=FLT,FLT Sigma multiple and, tolerance or number. -t, --qthresh=FLT Quantile threshold on convolved image. Operating modes: -?, --help give this help list --checkconfig List all config files and variables read. --cite BibTeX citation for this program. --config=STR Read configuration file STR immediately. --config-prefix=STR Custom prefix of option names config files. -C, --continueaftercheck Continue processing after checks. --lastconfig Do not parse any more configuration files. --minmapsize=INT Min. bytes to avoid RAM automatically. -N, --numthreads=INT Number of CPU threads to use. --onlyversion=STR Only run if the program version is STR. -P, --printparams Print parameter values to be used and abort. --quietmmap Don't print mmap'd file's name and size. -q, --quiet Only report errors, remain quiet about steps. -S, --setdirconf Set default values for this directory and abort. --usage give a short usage message -U, --setusrconf Set default values for this user and abort. -V, --version print program version Mandatory or optional arguments to long options are also mandatory or op- tional for any corresponding short options. GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/ REPORTING BUGS Report bugs to bug-gnuastro@gnu.org. COPYRIGHT Copyright (C) 2015-2025 Free Software Foundation, Inc. License GPLv3+: GNU General public license version 3 or later. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written/developed by Mohammad Akhlaghi SEE ALSO The full documentation for NoiseChisel is maintained as a Texinfo manual. If the info and NoiseChisel programs are properly installed at your site, the command info NoiseChisel should give you access to the complete manual. GNU Astronomy Utilities 0.24 November 2025 NOISECHISEL(1)
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