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fix: OBB corner detection in convert_yolo_obb_to_annotation #682

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fix: OBB corner detection in convert_yolo_obb_to_annotation #682

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49 changes: 24 additions & 25 deletions src/label_studio_sdk/converter/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -502,36 +502,34 @@ def convert_yolo_obb_to_annotation(xyxyxyxy, original_width, original_height):
# Reshape the coordinates into a 4x2 matrix
coords = np.array(xyxyxyxy, dtype=np.float64).reshape((4, 2))

# Calculate the center of the bounding box
center_x = np.mean(coords[:, 0])
center_y = np.mean(coords[:, 1])
# Sort by X, get left-most two and right-most two points
sorted_by_x = sorted(coords, key=lambda c: c[0])
left_two = sorted_by_x[:2]
right_two = sorted_by_x[2:]

# Calculate the width and height of the bounding box
width = np.linalg.norm(coords[0] - coords[1])
height = np.linalg.norm(coords[0] - coords[3])
# Top-left = left-most with smallest Y
top_left = min(left_two, key=lambda c: c[1])
bottom_left = max(left_two, key=lambda c: c[1])

# Top-right = right-most with smallest Y
top_right = min(right_two, key=lambda c: c[1])

# Width: distance between TL and TR
width = float(np.linalg.norm(np.array(top_right) - np.array(top_left)))

# Height: distance between TL and BL
height = float(np.linalg.norm(np.array(bottom_left) - np.array(top_left)))

# Calculate the rotation angle
dx = coords[1, 0] - coords[0, 0]
dy = coords[1, 1] - coords[0, 1]
r = np.degrees(np.arctan2(dy, dx))

# Find the top-left corner (x, y)
top_left_x = (
center_x
- (width / 2) * np.cos(np.radians(r))
+ (height / 2) * np.sin(np.radians(r))
)
top_left_y = (
center_y
- (width / 2) * np.sin(np.radians(r))
- (height / 2) * np.cos(np.radians(r))
)
dx = top_right[0] - top_left[0]
dy = top_right[1] - top_left[1]
r = float(np.degrees(np.arctan2(dy, dx)))

# Normalize the values
x = (top_left_x / original_width) * 100
y = (top_left_y / original_height) * 100
width = (width / original_width) * 100
height = (height / original_height) * 100
x = (top_left[0] / original_width) * 100.0
y = (top_left[1] / original_height) * 100.0
width = (width / original_width) * 100.0
height = (height / original_height) * 100.0

# Create the dictionary for Label Studio
return {
Expand All @@ -543,3 +541,4 @@ def convert_yolo_obb_to_annotation(xyxyxyxy, original_width, original_height):
"original_width": original_width,
"original_height": original_height,
}

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