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Add augmenters for colorwise grayscaling #462

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Nov 3, 2019
Merged

Add augmenters for colorwise grayscaling #462

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211a4b4
Add GrayscaleColorwise
aleju Oct 19, 2019
c8ddc7d
Add RemoveSaturation
aleju Oct 19, 2019
650f1f5
Add RemoveSaturationColorwise
aleju Oct 19, 2019
15f606b
Fix PR ID in changelog
aleju Oct 19, 2019
d965fe2
Fix example and tests
aleju Oct 27, 2019
016d8b5
Fix pylint and py27 errors
aleju Oct 27, 2019
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8 changes: 8 additions & 0 deletions changelogs/master/added/20191019_colorwise_grayscaling.md
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# Colorwise Grayscaling #462

* Added `RemoveSaturation`, a shortcut for `MultiplySaturation((0.0, 1.0))`
with outputs similar to `Grayscale((0.0, 1.0))`.
* Added `GrayscaleColorwise`, which applies grayscaling to randomly
picked colors in the image.
* Added `RemoveSaturationColorwise`, which applies color saturation removal
to randomy picked colors in the image.
33 changes: 33 additions & 0 deletions checks/check_grayscale_colorwise.py
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import imgaug as ia
import imgaug.augmenters as iaa
import imageio


def main():
urls = [
("https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/"
"Sarcophilus_harrisii_taranna.jpg/"
"320px-Sarcophilus_harrisii_taranna.jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/"
"Vincent_van_Gogh_-_Wheatfield_with_crows_-_Google_Art_Project.jpg/"
"320px-Vincent_van_Gogh_-_Wheatfield_with_crows_-_Google_Art_Project"
".jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/"
"Galerella_sanguinea_Zoo_Praha_2011-2.jpg/207px-Galerella_sanguinea_"
"Zoo_Praha_2011-2.jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/"
"Ambrosius_Bosschaert_the_Elder_%28Dutch_-_Flower_Still_Life_-_"
"Google_Art_Project.jpg/307px-Ambrosius_Bosschaert_the_Elder_%28"
"Dutch_-_Flower_Still_Life_-_Google_Art_Project.jpg")
]

image = imageio.imread(urls[1])

aug = iaa.GrayscaleColorwise(10, 0.1, alpha=[0.0, 1.0])
images_aug = aug(images=[image] * (5*5))

ia.imshow(ia.draw_grid(images_aug))


if __name__ == "__main__":
main()
33 changes: 33 additions & 0 deletions checks/check_remove_saturation.py
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import imgaug as ia
import imgaug.augmenters as iaa
import imageio


def main():
urls = [
("https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/"
"Sarcophilus_harrisii_taranna.jpg/"
"320px-Sarcophilus_harrisii_taranna.jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/"
"Vincent_van_Gogh_-_Wheatfield_with_crows_-_Google_Art_Project.jpg/"
"320px-Vincent_van_Gogh_-_Wheatfield_with_crows_-_Google_Art_Project"
".jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/"
"Galerella_sanguinea_Zoo_Praha_2011-2.jpg/207px-Galerella_sanguinea_"
"Zoo_Praha_2011-2.jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/"
"Ambrosius_Bosschaert_the_Elder_%28Dutch_-_Flower_Still_Life_-_"
"Google_Art_Project.jpg/307px-Ambrosius_Bosschaert_the_Elder_%28"
"Dutch_-_Flower_Still_Life_-_Google_Art_Project.jpg")
]

image = imageio.imread(urls[3])

aug = iaa.RemoveSaturation()
images_aug = aug(images=[image] * (5*5))

ia.imshow(ia.draw_grid(images_aug))


if __name__ == "__main__":
main()
33 changes: 33 additions & 0 deletions checks/check_remove_saturation_colorwise.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
import imgaug as ia
import imgaug.augmenters as iaa
import imageio


def main():
urls = [
("https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/"
"Sarcophilus_harrisii_taranna.jpg/"
"320px-Sarcophilus_harrisii_taranna.jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/"
"Vincent_van_Gogh_-_Wheatfield_with_crows_-_Google_Art_Project.jpg/"
"320px-Vincent_van_Gogh_-_Wheatfield_with_crows_-_Google_Art_Project"
".jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/"
"Galerella_sanguinea_Zoo_Praha_2011-2.jpg/207px-Galerella_sanguinea_"
"Zoo_Praha_2011-2.jpg"),
("https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/"
"Ambrosius_Bosschaert_the_Elder_%28Dutch_-_Flower_Still_Life_-_"
"Google_Art_Project.jpg/307px-Ambrosius_Bosschaert_the_Elder_%28"
"Dutch_-_Flower_Still_Life_-_Google_Art_Project.jpg")
]

image = imageio.imread(urls[1])

aug = iaa.RemoveSaturationColorwise(10, 0.1, alpha=[0.0, 1.0])
images_aug = aug(images=[image] * (5*5))

ia.imshow(ia.draw_grid(images_aug))


if __name__ == "__main__":
main()