add color jitter augmentation (#680)

* add color jitter augmentation

* fix spelling

maskrcnn_benchmark/config/defaults.py

@@ -54,6 +54,12 @@ _C.INPUT.PIXEL_STD = [1., 1., 1.]
 # Convert image to BGR format (for Caffe2 models), in range 0-255
 _C.INPUT.TO_BGR255 = True
 
+# Image ColorJitter
+_C.INPUT.BRIGHTNESS = 0.0
+_C.INPUT.CONTRAST = 0.0
+_C.INPUT.SATURATION = 0.0
+_C.INPUT.HUE = 0.0
+
 
 # -----------------------------------------------------------------------------
 # Dataset

maskrcnn_benchmark/data/transforms/build.py

@@ -16,9 +16,16 @@ def build_transforms(cfg, is_train=True):
     normalize_transform = T.Normalize(
         mean=cfg.INPUT.PIXEL_MEAN, std=cfg.INPUT.PIXEL_STD, to_bgr255=to_bgr255
     )
+    color_jitter = T.ColorJitter(
+        brightness=cfg.INPUT.BRIGHTNESS,
+        contrast=cfg.INPUT.CONTRAST,
+        saturation=cfg.INPUT.SATURATION,
+        hue=cfg.INPUT.HUE,
+        )
 
     transform = T.Compose(
         [
+            color_jitter,
             T.Resize(min_size, max_size),
             T.RandomHorizontalFlip(flip_prob),
             T.ToTensor(),

maskrcnn_benchmark/data/transforms/transforms.py

@@ -72,6 +72,24 @@ class RandomHorizontalFlip(object):
         return image, target
 
 
+class ColorJitter(object):
+    def __init__(self,
+                 brightness=None,
+                 contrast=None,
+                 saturation=None,
+                 hue=None,
+                 ):
+        self.color_jitter = torchvision.transforms.ColorJitter(
+            brightness=brightness,
+            contrast=contrast,
+            saturation=saturation,
+            hue=hue,)
+
+    def __call__(self, image, target):
+        image = self.color_jitter(image)
+        return image, target
+
+
 class ToTensor(object):
     def __call__(self, image, target):
         return F.to_tensor(image), target