feat: randomize paste brightness

Former-commit-id: f3a14bc9fe5ea633837b638cc04313566e951190 [formerly 830199ee956eed9f62f845f1406d00c14e1f1262]
Former-commit-id: 542421d35c7103812cf621af5777c88812506adb

comp.ipynb.REMOVED.git-id

@@ -1 +1 @@
-946598e599580eb39a7de79d3607416538bc0019
+fb39f9a23b728fadb88ce579f78bb419ff0eaab6

src/utils/paste.py

@@ -3,7 +3,7 @@ import random as rd
 
 import albumentations as A
 import numpy as np
-from PIL import Image
+from PIL import Image, ImageEnhance
 
 
 class RandomPaste(A.DualTransform):
@@ -112,6 +112,10 @@ class RandomPaste(A.DualTransform):
         # update paste_shape after scaling
         paste_shape = np.array(paste_img.size, dtype=np.uint)
 
+        # change brightness randomly
+        filter = ImageEnhance.Brightness(paste_img)
+        paste_img = filter.enhance(rd.uniform(0.5, 1.5))
+
         # generate some positions
         positions = []
         NB = rd.randint(1, self.nb)