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author | Tomas Kulhanek <tomas.kulhanek@stfc.ac.uk> | 2019-02-25 03:35:50 -0500 |
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committer | Tomas Kulhanek <tomas.kulhanek@stfc.ac.uk> | 2019-02-25 03:35:50 -0500 |
commit | 047d9e2a7dda92e13414b980a93c3f1724665241 (patch) | |
tree | cf9388363106c203c523fb63105a59351e89d873 /Wrappers/Python | |
parent | 5a2fd376130ea2c7c4ac1704bc9d2f087522855d (diff) | |
download | regularization-047d9e2a7dda92e13414b980a93c3f1724665241.tar.gz regularization-047d9e2a7dda92e13414b980a93c3f1724665241.tar.bz2 regularization-047d9e2a7dda92e13414b980a93c3f1724665241.tar.xz regularization-047d9e2a7dda92e13414b980a93c3f1724665241.zip |
MOVE: Wrappers/Python/supp to src/Python/ccpi/supp
Diffstat (limited to 'Wrappers/Python')
-rw-r--r-- | Wrappers/Python/ccpi/supp/__init__.py | 0 | ||||
-rw-r--r-- | Wrappers/Python/ccpi/supp/qualitymetrics.py | 65 |
2 files changed, 0 insertions, 65 deletions
diff --git a/Wrappers/Python/ccpi/supp/__init__.py b/Wrappers/Python/ccpi/supp/__init__.py deleted file mode 100644 index e69de29..0000000 --- a/Wrappers/Python/ccpi/supp/__init__.py +++ /dev/null diff --git a/Wrappers/Python/ccpi/supp/qualitymetrics.py b/Wrappers/Python/ccpi/supp/qualitymetrics.py deleted file mode 100644 index f44d832..0000000 --- a/Wrappers/Python/ccpi/supp/qualitymetrics.py +++ /dev/null @@ -1,65 +0,0 @@ -#!/usr/bin/env python2 -# -*- coding: utf-8 -*- -""" -A class for some standard image quality metrics -""" -import numpy as np - -class QualityTools: - def __init__(self, im1, im2): - if im1.size != im2.size: - print ('Error: Sizes of images/volumes are different') - raise SystemExit - self.im1 = im1 # image or volume - 1 - self.im2 = im2 # image or volume - 2 - def nrmse(self): - """ Normalised Root Mean Square Error """ - rmse = np.sqrt(np.sum((self.im2 - self.im1) ** 2) / float(self.im1.size)) - max_val = max(np.max(self.im1), np.max(self.im2)) - min_val = min(np.min(self.im1), np.min(self.im2)) - return 1 - (rmse / (max_val - min_val)) - def rmse(self): - """ Root Mean Square Error """ - rmse = np.sqrt(np.sum((self.im1 - self.im2) ** 2) / float(self.im1.size)) - return rmse - def ssim(self, window, k=(0.01, 0.03), l=255): - from scipy.signal import fftconvolve - """See https://ece.uwaterloo.ca/~z70wang/research/ssim/""" - # Check if the window is smaller than the images. - for a, b in zip(window.shape, self.im1.shape): - if a > b: - return None, None - # Values in k must be positive according to the base implementation. - for ki in k: - if ki < 0: - return None, None - - c1 = (k[0] * l) ** 2 - c2 = (k[1] * l) ** 2 - window = window/np.sum(window) - - mu1 = fftconvolve(self.im1, window, mode='valid') - mu2 = fftconvolve(self.im2, window, mode='valid') - mu1_sq = mu1 * mu1 - mu2_sq = mu2 * mu2 - mu1_mu2 = mu1 * mu2 - sigma1_sq = fftconvolve(self.im1 * self.im1, window, mode='valid') - mu1_sq - sigma2_sq = fftconvolve(self.im2 * self.im2, window, mode='valid') - mu2_sq - sigma12 = fftconvolve(self.im1 * self.im2, window, mode='valid') - mu1_mu2 - - if c1 > 0 and c2 > 0: - num = (2 * mu1_mu2 + c1) * (2 * sigma12 + c2) - den = (mu1_sq + mu2_sq + c1) * (sigma1_sq + sigma2_sq + c2) - ssim_map = num / den - else: - num1 = 2 * mu1_mu2 + c1 - num2 = 2 * sigma12 + c2 - den1 = mu1_sq + mu2_sq + c1 - den2 = sigma1_sq + sigma2_sq + c2 - ssim_map = np.ones(np.shape(mu1)) - index = (den1 * den2) > 0 - ssim_map[index] = (num1[index] * num2[index]) / (den1[index] * den2[index]) - index = (den1 != 0) & (den2 == 0) - ssim_map[index] = num1[index] / den1[index] - mssim = ssim_map.mean() - return mssim, ssim_map |