diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/msvst_starlet.py (renamed from python/starlet.py) | 101 |
1 files changed, 95 insertions, 6 deletions
diff --git a/python/starlet.py b/python/msvst_starlet.py index 67e69ba..b90adf9 100644 --- a/python/starlet.py +++ b/python/msvst_starlet.py @@ -1,3 +1,4 @@ +#!/usr/bin/env python3 # -*- coding: utf-8 -*- # # References: @@ -10,23 +11,36 @@ # # Aaron LI # Created: 2016-03-17 -# Updated: 2016-03-22 +# Updated: 2016-04-20 +# +# ChangeLog: +# 2016-04-20: +# * Add argparse and main() for scripting # """ Starlet wavelet transform, i.e., isotropic undecimated wavelet transform (IUWT), or à trous wavelet transform. -And multi-scale variance stabling transform (MS-VST). +And multi-scale variance stabling transform (MS-VST), which can be used +to effectively remove the Poisson noises. """ +__version__ = "0.2.0" +__date__ = "2016-04-20" + + import sys +import os +import argparse +from datetime import datetime import numpy as np import scipy as sp from scipy import signal +from astropy.io import fits -class B3Spline: +class B3Spline: # {{{ """ B3-spline wavelet. """ @@ -35,9 +49,10 @@ class B3Spline: dec_hi = np.array([-1.0, -4.0, 10.0, -4.0, -1.0]) / 16 rec_lo = np.array([0.0, 0.0, 1.0, 0.0, 0.0]) rec_hi = np.array([0.0, 0.0, 1.0, 0.0, 0.0]) +# B3Spline }}} -class IUWT: +class IUWT: # {{{ """ Isotropic undecimated wavelet transform. """ @@ -239,9 +254,10 @@ class IUWT: Get the approximation coefficients of the largest scale. """ return self.decomposition[-1] +# IUWT }}} -class IUWT_VST(IUWT): +class IUWT_VST(IUWT): # {{{ """ IUWT with Multi-scale variance stabling transform. @@ -367,6 +383,8 @@ class IUWT_VST(IUWT): """ Multiple hypothesis testing with false discovery rate (FDR) control. + `independent': whether the test statistics of all the null + hypotheses are independent. If `independent=True': FDR <= (m0/m) * q otherwise: FDR <= (m0/m) * q * (1 + 1/2 + 1/3 + ... + 1/m) @@ -482,9 +500,12 @@ class IUWT_VST(IUWT): iuwt = IUWT(level=self.level) iuwt.calc_filters() # iterative reconstruction + if verbose: + print("Iteratively reconstructing (%d times): " % niter, + end="", flush=True, file=sys.stderr) for i in range(niter): if verbose: - print("iter: %d" % i+1, file=sys.stderr) + print("%d..." % i, end="", flush=True, file=sys.stderr) tempd = self.data.copy() solution_decomp = [] for scale in range(1, self.level+1): @@ -507,7 +528,75 @@ class IUWT_VST(IUWT): solution[solution < 0] = 0.0 # lbd -= delta + if verbose: + print("DONE!", flush=True, file=sys.stderr) # self.reconstruction = solution return self.reconstruction +# IUWT_VST }}} + + +def main(): + # commandline arguments parser + parser = argparse.ArgumentParser( + description="Poisson Noise Removal with Multi-scale Variance " + \ + "Stabling Transform and Wavelet Transform", + epilog="Version: %s (%s)" % (__version__, __date__)) + parser.add_argument("-l", "--level", dest="level", + type=int, default=5, + help="level of the IUWT decomposition") + parser.add_argument("-r", "--fdr", dest="fdr", + type=float, default=0.1, + help="false discovery rate") + parser.add_argument("-I", "--fdr-independent", dest="fdr_independent", + action="store_true", default=False, + help="whether the FDR null hypotheses are independent") + parser.add_argument("-n", "--niter", dest="niter", + type=int, default=20, + help="number of iterations for reconstruction") + parser.add_argument("-v", "--verbose", dest="verbose", + action="store_true", default=False, + help="show verbose progress") + parser.add_argument("-C", "--clobber", dest="clobber", + action="store_true", default=False, + help="overwrite output file if exists") + parser.add_argument("infile", help="input image with Poisson noises") + parser.add_argument("outfile", help="output denoised image") + args = parser.parse_args() + + if args.verbose: + print("infile: '%s'" % args.infile, file=sys.stderr) + print("outfile: '%s'" % args.outfile, file=sys.stderr) + print("level: %s" % args.level, file=sys.stderr) + print("fdr: %s" % args.fdr, file=sys.stderr) + print("fdr_independent: %s" % args.fdr_independent, file=sys.stderr) + print("niter: %s\n" % args.niter, file=sys.stderr) + + imgfits = fits.open(args.infile) + img = imgfits[0].data + # Remove Poisson noises + msvst = IUWT_VST(data=img) + if args.verbose: + print("INFO: MSVST decomposing ...", file=sys.stderr) + msvst.decompose(level=args.level) + if args.verbose: + print("INFO: MSVST denosing ...", file=sys.stderr) + msvst.denoise(fdr=args.fdr, fdr_independent=args.fdr_independent) + if args.verbose: + print("INFO: MSVST reconstructing (this may take a while) ...", + file=sys.stderr) + msvst.reconstruct(denoised=True, niter=args.niter, verbose=args.verbose) + img_denoised = msvst.reconstruction + # Output + imgfits[0].data = img_denoised + imgfits[0].header.add_history("%s: Removed Poisson Noises @ %s" % ( + os.path.basename(sys.argv[0]), datetime.utcnow().isoformat())) + imgfits[0].header.add_history(" TOOL: %s (v%s)" % ( + os.path.basename(sys.argv[0]), __version__)) + imgfits[0].header.add_history(" PARAM: %s" % " ".join(sys.argv[1:])) + imgfits.writeto(args.outfile, checksum=True, clobber=args.clobber) + + +if __name__ == "__main__": + main() |