Add RandomEqualize prototype transforms (#5807)

Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

torchvision/prototype/transforms/__init__.py

@@ -4,7 +4,7 @@ from ._transform import Transform  # usort: skip
 
 from ._augment import RandomErasing, RandomMixup, RandomCutmix
 from ._auto_augment import RandAugment, TrivialAugmentWide, AutoAugment, AugMix
-from ._color import ColorJitter, RandomPhotometricDistort
+from ._color import ColorJitter, RandomPhotometricDistort, RandomEqualize
 from ._container import Compose, RandomApply, RandomChoice, RandomOrder
 from ._geometry import (
     Resize,

torchvision/prototype/transforms/_color.py

@@ -8,6 +8,7 @@ from torchvision.prototype import features
 from torchvision.prototype.transforms import Transform, functional as F
 from torchvision.transforms import functional as _F
 
+from ._transform import _RandomApplyTransform
 from ._utils import is_simple_tensor, get_image_dimensions, query_image
 
 T = TypeVar("T", features.Image, torch.Tensor, PIL.Image.Image)
@@ -188,3 +189,19 @@ class RandomPhotometricDistort(Transform):
         if params["channel_shuffle"]:
             input = self._channel_shuffle(input)
         return input
+
+
+class RandomEqualize(_RandomApplyTransform):
+    def __init__(self, p: float = 0.5):
+        super().__init__(p=p)
+
+    def _transform(self, input: Any, params: Dict[str, Any]) -> Any:
+        if isinstance(input, features.Image):
+            output = F.equalize_image_tensor(input)
+            return features.Image.new_like(input, output)
+        elif is_simple_tensor(input):
+            return F.equalize_image_tensor(input)
+        elif isinstance(input, PIL.Image.Image):
+            return F.equalize_image_pil(input)
+        else:
+            return input