Fixing the rotating bbox issue

augly/image/utils/bboxes.py

@@ -395,20 +395,18 @@ def get_enclosing_bbox(
 
     # Get rotated bbox corner coefficients
     rotation_center = (src_w // 2, src_h // 2)
-    angle_rad = -math.radians(degrees)
+    angle_rad = math.radians(degrees)
     rotation_matrix = [
         round(math.cos(angle_rad), 15),
         round(math.sin(angle_rad), 15),
         0.0,
-        round(math.sin(angle_rad), 15),
-        round(-math.cos(angle_rad), 15),
+        round(-math.sin(angle_rad), 15),
+        round(math.cos(angle_rad), 15),
         0.0,
     ]
     rotation_matrix[2], rotation_matrix[5] = transform(
         -rotation_center[0], -rotation_center[1], rotation_matrix
     )
-    rotation_matrix[2] += rotation_center[0]
-    rotation_matrix[5] += rotation_center[1]
 
     # Get rotated image dimensions
     src_img_corners = [(0, 0), (src_w, 0), (src_w, src_h), (0, src_h)]
@@ -418,6 +416,10 @@ def get_enclosing_bbox(
         rotated_img_max_x,
         rotated_img_max_y,
     ) = get_enclosing_bbox(src_img_corners, rotation_matrix)
+
+    rotation_matrix[2] += rotated_img_max_x
+    rotation_matrix[5] += rotated_img_max_y
+
     rotated_img_w = rotated_img_max_x - rotated_img_min_x
     rotated_img_h = rotated_img_max_y - rotated_img_min_y
 
@@ -435,10 +437,10 @@ def get_enclosing_bbox(
     # Crop bbox as src image is cropped inside `rotate`
     cropped_w, cropped_h = imutils.rotated_rect_with_max_area(src_w, src_h, degrees)
     cropped_img_left, cropped_img_upper, cropped_img_right, cropped_img_lower = (
-        (rotated_img_w - cropped_w) // 2 + rotated_img_min_x,
-        (rotated_img_h - cropped_h) // 2 + rotated_img_min_y,
-        (rotated_img_w + cropped_w) // 2 + rotated_img_min_x,
-        (rotated_img_h + cropped_h) // 2 + rotated_img_min_y,
+        (rotated_img_w - cropped_w) // 2 + rotated_img_min_x + rotated_img_max_x,
+        (rotated_img_h - cropped_h) // 2 + rotated_img_min_y + rotated_img_max_y,
+        (rotated_img_w + cropped_w) // 2 + rotated_img_min_x + rotated_img_max_x,
+        (rotated_img_h + cropped_h) // 2 + rotated_img_min_y + rotated_img_max_y,
     )
     return crop_bboxes_helper(
         bbox_enclosing_bbox,