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authorTomas Kulhanek <tomas.kulhanek@stfc.ac.uk>2019-02-25 03:35:50 -0500
committerTomas Kulhanek <tomas.kulhanek@stfc.ac.uk>2019-02-25 03:35:50 -0500
commit047d9e2a7dda92e13414b980a93c3f1724665241 (patch)
treecf9388363106c203c523fb63105a59351e89d873 /Wrappers/Python
parent5a2fd376130ea2c7c4ac1704bc9d2f087522855d (diff)
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MOVE: Wrappers/Python/supp to src/Python/ccpi/supp
Diffstat (limited to 'Wrappers/Python')
-rw-r--r--Wrappers/Python/ccpi/supp/__init__.py0
-rw-r--r--Wrappers/Python/ccpi/supp/qualitymetrics.py65
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