rebaseline_server: delete no-longer-used weightedDiffMeasure

(replaced by perceptual diff)

NOTRY=True
R=rmistry@google.com
TBR=rmistry

Author: epoger@google.com

Review URL: https://codereview.chromium.org/334533003

gm/rebaseline_server/imagediffdb.py

@@ -49,7 +49,6 @@ KEY__DIFFERENCES__MAX_DIFF_PER_CHANNEL = 'maxDiffPerChannel'
 KEY__DIFFERENCES__NUM_DIFF_PIXELS = 'numDifferingPixels'
 KEY__DIFFERENCES__PERCENT_DIFF_PIXELS = 'percentDifferingPixels'
 KEY__DIFFERENCES__PERCEPTUAL_DIFF = 'perceptualDifference'
-KEY__DIFFERENCES__WEIGHTED_DIFF = 'weightedDiffMeasure'
 
 
 class DiffRecord(object):
@@ -117,8 +116,6 @@ class DiffRecord(object):
     diff_image = _generate_image_diff(actual_image, expected_image)
     diff_histogram = diff_image.histogram()
     (diff_width, diff_height) = diff_image.size
-    self._weighted_diff_measure = _calculate_weighted_diff_metric(
-        diff_histogram, diff_width * diff_height)
     self._max_diff_per_channel = _max_per_band(diff_histogram)
 
     # Generate the whitediff image (any differing pixels show as white).
@@ -189,14 +186,6 @@ class DiffRecord(object):
     """Returns the perceptual difference percentage."""
     return self._perceptual_difference
 
-  def get_weighted_diff_measure(self):
-    """Returns a weighted measure of image diffs, as a float between 0 and 100
-    (inclusive).
-
-    TODO(epoger): Delete this function, now that we have perceptual diff?
-    """
-    return self._weighted_diff_measure
-
   def get_max_diff_per_channel(self):
     """Returns the maximum difference between the expected and actual images
     for each R/G/B channel, as a list."""
@@ -209,7 +198,6 @@ class DiffRecord(object):
         KEY__DIFFERENCES__NUM_DIFF_PIXELS: self._num_pixels_differing,
         KEY__DIFFERENCES__PERCENT_DIFF_PIXELS:
             self.get_percent_pixels_differing(),
-        KEY__DIFFERENCES__WEIGHTED_DIFF: self.get_weighted_diff_measure(),
         KEY__DIFFERENCES__MAX_DIFF_PER_CHANNEL: self._max_diff_per_channel,
         KEY__DIFFERENCES__PERCEPTUAL_DIFF: self._perceptual_difference,
     }
@@ -290,31 +278,6 @@ class ImageDiffDB(object):
 
 # Utility functions
 
-def _calculate_weighted_diff_metric(histogram, num_pixels):
-  """Given the histogram of a diff image (per-channel diff at each
-  pixel between two images), calculate the weighted diff metric (a
-  stab at how different the two images really are).
-
-  TODO(epoger): Delete this function, now that we have perceptual diff?
-
-  Args:
-    histogram: PIL histogram of a per-channel diff between two images
-    num_pixels: integer; the total number of pixels in the diff image
-
-  Returns: a weighted diff metric, as a float between 0 and 100 (inclusive).
-  """
-  # TODO(epoger): As a wild guess at an appropriate metric, weight each
-  # different pixel by the square of its delta value.  (The more different
-  # a pixel is from its expectation, the more we care about it.)
-  assert(len(histogram) % VALUES_PER_BAND == 0)
-  num_bands = len(histogram) / VALUES_PER_BAND
-  max_diff = num_pixels * num_bands * (VALUES_PER_BAND - 1)**2
-  total_diff = 0
-  for index in xrange(len(histogram)):
-    total_diff += histogram[index] * (index % VALUES_PER_BAND)**2
-  return float(100 * total_diff) / max_diff
-
-
 def _max_per_band(histogram):
   """Given the histogram of an image, return the maximum value of each band
   (a.k.a. "color channel", such as R/G/B) across the entire image.

gm/rebaseline_server/imagediffdb_test.py

@@ -56,23 +56,22 @@ class ImageDiffDbTest(unittest.TestCase):
     # 2. actual image locator
     # 3. actual image URL
     # 4. expected percent_pixels_differing (as a string, to 4 decimal places)
-    # 5. expected weighted_diff_measure (as a string, to 4 decimal places)
+    # 5. expected perceptual difference (as a string, to 4 decimal places)
-    # 6. expected perceptual difference (as a string, to 4 decimal places)
+    # 6. expected max_diff_per_channel
-    # 7. expected max_diff_per_channel
     selftests = [
         [
             'arcofzorro/16206093933823793653',
             IMG_URL_BASE + 'arcofzorro/16206093933823793653.png',
             'arcofzorro/13786535001616823825',
             IMG_URL_BASE + 'arcofzorro/13786535001616823825.png',
-            '0.0662', '0.0113', '0.0662', [255, 255, 247],
+            '0.0662', '0.0662', [255, 255, 247],
         ],
         [
             'gradients_degenerate_2pt/10552995703607727960',
             IMG_URL_BASE + 'gradients_degenerate_2pt/10552995703607727960.png',
             'gradients_degenerate_2pt/11198253335583713230',
             IMG_URL_BASE + 'gradients_degenerate_2pt/11198253335583713230.png',
-            '100.0000', '66.6667', '100.0000', [255, 0, 255],
+            '100.0000', '100.0000', [255, 0, 255],
         ],
     ]
 
@@ -89,9 +88,8 @@ class ImageDiffDbTest(unittest.TestCase):
                                   actual_image_locator=selftest[2])
       self.assertEqual('%.4f' % record.get_percent_pixels_differing(),
                        selftest[4])
-      self.assertEqual('%.4f' % record.get_weighted_diff_measure(), selftest[5])
+      self.assertEqual('%.4f' % record.get_perceptual_difference(), selftest[5])
-      self.assertEqual('%.4f' % record.get_perceptual_difference(), selftest[6])
+      self.assertEqual(record.get_max_diff_per_channel(), selftest[6])
-      self.assertEqual(record.get_max_diff_per_channel(), selftest[7])
 
 
 def main():

gm/rebaseline_server/imagepair_test.py

@@ -88,7 +88,6 @@ class ImagePairTest(unittest.TestCase):
                     'numDifferingPixels': 662,
                     'percentDifferingPixels': 0.0662,
                     'perceptualDifference': 0.06620000000000914,
-                    'weightedDiffMeasure': 0.01127756555171088,
                 },
                 'imageAUrl': 'arcofzorro/16206093933823793653.png',
                 'imageBUrl': 'arcofzorro/13786535001616823825.png',
@@ -115,7 +114,6 @@ class ImagePairTest(unittest.TestCase):
                     'numDifferingPixels': 102400,
                     'percentDifferingPixels': 100.00,
                     'perceptualDifference': 100.00,
-                    'weightedDiffMeasure': 66.66666666666667,
                 },
                 'expectations': {
                     'bugs': [1001, 1002],

gm/rebaseline_server/imagepairset_test.py

@@ -35,7 +35,6 @@ IMAGEPAIR_2_AS_DICT = {
         'maxDiffPerChannel': [1, 2, 3],
         'numDifferingPixels': 111,
         'percentDifferingPixels': 22.222,
-        'weightedDiffMeasure': 33.333,
     },
     imagepair.KEY__IMAGEPAIRS__EXTRACOLUMNS: {
         'builder': 'MyBuilder',
@@ -50,7 +49,6 @@ IMAGEPAIR_3_AS_DICT = {
         'maxDiffPerChannel': [4, 5, 6],
         'numDifferingPixels': 111,
         'percentDifferingPixels': 44.444,
-        'weightedDiffMeasure': 33.333,
     },
     imagepair.KEY__IMAGEPAIRS__EXPECTATIONS: {
         'bugs': [1001, 1002],

gm/rebaseline_server/static/constants.js

@@ -20,7 +20,6 @@ module.constant('constants', (function() {
     KEY__DIFFERENCES__NUM_DIFF_PIXELS: 'numDifferingPixels',
     KEY__DIFFERENCES__PERCENT_DIFF_PIXELS: 'percentDifferingPixels',
     KEY__DIFFERENCES__PERCEPTUAL_DIFF: 'perceptualDifference',
-    KEY__DIFFERENCES__WEIGHTED_DIFF: 'weightedDiffMeasure',
 
     // NOTE: Keep these in sync with ../imagepair.py
     KEY__IMAGEPAIRS__DIFFERENCES: 'differenceData',

gm/rebaseline_server/static/view.html

@@ -280,7 +280,7 @@
           <th width="{{imageSize}}">
             <input type="radio"
                    name="sortColumnRadio"
-                   value="weightedDiffMeasure"
+                   value="perceptualDiff"
                    ng-checked="(sortColumnKey == constants.KEY__DIFFERENCES__PERCEPTUAL_DIFF)"
                    ng-click="sortResultsBy(constants.KEY__IMAGEPAIRS__DIFFERENCES, constants.KEY__DIFFERENCES__PERCEPTUAL_DIFF)">
             perceptual difference

gm/rebaseline_server/testdata/outputs/expected/compare_configs_test.CompareConfigsTest.test_gm/gm.json

@@ -94,7 +94,7 @@
     }
   }, 
   "header": {
-    "dataHash": "-3232866296817265056", 
+    "dataHash": "5496105477154010366", 
     "isEditable": false, 
     "isExported": true, 
     "schemaVersion": 3, 
@@ -189,8 +189,7 @@
         ], 
         "numDifferingPixels": 6081, 
         "percentDifferingPixels": 2.4324, 
-        "perceptualDifference": 1.917199999999994, 
+        "perceptualDifference": 1.917199999999994
-        "weightedDiffMeasure": 0.06644571780084584
       }, 
       "extraColumns": {
         "builder": "Test-Builder-We-Have-No-Expectations-File-For", 
@@ -211,8 +210,7 @@
         ], 
         "numDifferingPixels": 50097, 
         "percentDifferingPixels": 30.5767822265625, 
-        "perceptualDifference": 3.3917, 
+        "perceptualDifference": 3.3917
-        "weightedDiffMeasure": 1.4826590790651433
       }, 
       "extraColumns": {
         "builder": "Test-Builder-We-Have-No-Expectations-File-For", 
@@ -255,8 +253,7 @@
         ], 
         "numDifferingPixels": 6081, 
         "percentDifferingPixels": 2.4324, 
-        "perceptualDifference": 1.917199999999994, 
+        "perceptualDifference": 1.917199999999994
-        "weightedDiffMeasure": 0.06644571780084584
       }, 
       "extraColumns": {
         "builder": "Test-Mac10.7-MacMini4.1-GeForce320M-x86_64-Debug", 
@@ -277,8 +274,7 @@
         ], 
         "numDifferingPixels": 50097, 
         "percentDifferingPixels": 30.5767822265625, 
-        "perceptualDifference": 3.3917, 
+        "perceptualDifference": 3.3917
-        "weightedDiffMeasure": 1.4826590790651433
       }, 
       "extraColumns": {
         "builder": "Test-Mac10.7-MacMini4.1-GeForce320M-x86_64-Debug", 

gm/rebaseline_server/testdata/outputs/expected/compare_to_expectations_test.CompareToExpectationsTest.test_gm/gm.json

@@ -110,7 +110,7 @@
     }
   }, 
   "header": {
-    "dataHash": "-5343462047057549086", 
+    "dataHash": "7849962375815855931", 
     "isEditable": false, 
     "isExported": true, 
     "schemaVersion": 3, 
@@ -128,8 +128,7 @@
         ], 
         "numDifferingPixels": 120000, 
         "percentDifferingPixels": 75.0, 
-        "perceptualDifference": 50.122499999999995, 
+        "perceptualDifference": 50.122499999999995
-        "weightedDiffMeasure": 8.413046264257337
       }, 
       "expectations": {
         "bugs": null, 
@@ -155,8 +154,7 @@
         ], 
         "numDifferingPixels": 765891, 
         "percentDifferingPixels": 97.38807678222656, 
-        "perceptualDifference": 25.25699999999999, 
+        "perceptualDifference": 25.25699999999999
-        "weightedDiffMeasure": 14.10677058693997
       }, 
       "expectations": {
         "bugs": [
@@ -184,8 +182,7 @@
         ], 
         "numDifferingPixels": 422432, 
         "percentDifferingPixels": 53.715006510416664, 
-        "perceptualDifference": 25.120500000000007, 
+        "perceptualDifference": 25.120500000000007
-        "weightedDiffMeasure": 14.005823726182287
       }, 
       "expectations": {
         "bugs": [
@@ -213,8 +210,7 @@
         ], 
         "numDifferingPixels": 53150, 
         "percentDifferingPixels": 12.035778985507246, 
-        "perceptualDifference": 100, 
+        "perceptualDifference": 100
-        "weightedDiffMeasure": 3.713243437353155
       }, 
       "expectations": {
         "bugs": [
@@ -242,8 +238,7 @@
         ], 
         "numDifferingPixels": 53773, 
         "percentDifferingPixels": 12.17685688405797, 
-        "perceptualDifference": 100, 
+        "perceptualDifference": 100
-        "weightedDiffMeasure": 3.6723483686597684
       }, 
       "expectations": {
         "bugs": [