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modify h range clip range in hsv augmentation (#825) 

* h range clip range edit in hsv augmentation

h range is [0., 179,]

* Update datasets.py

reduced indexing operations and used inplace clip for hsv. Two clips are used unfortunately (double clip of axis 0), but the overall effect should be improved speed.

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
This commit is contained in:
Yonghye Kwon 2020-02-08 02:14:55 +09:00 committed by GitHub
parent dca80f6f98
commit 145ea67a2e
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1 changed files with 3 additions and 2 deletions
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5
utils/datasets.py
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@ -530,8 +530,9 @@ def load_image(self, index):
def augment_hsv(img, hgain=0.5, sgain=0.5, vgain=0.5):
x = (np.random.uniform(-1, 1, 3) * np.array([hgain, sgain, vgain]) + 1).astype(np.float32) # random gains
img_hsv = (cv2.cvtColor(img, cv2.COLOR_BGR2HSV) * x.reshape((1, 1, 3))).clip(None, 255).astype(np.uint8)
x = np.random.uniform(-1, 1, 3) * [hgain, sgain, vgain] + 1 # random gains
img_hsv = (cv2.cvtColor(img, cv2.COLOR_BGR2HSV) * x).clip(None, 255).astype(np.uint8)
np.clip(img_hsv[:, :, 0], None, 179, out=img_hsv[:, :, 0]) # inplace hue clip (0 - 179 deg)
cv2.cvtColor(img_hsv, cv2.COLOR_HSV2BGR, dst=img) # no return needed