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Proposal for yolo bbox conversion #912

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Proposal for yolo bbox conversion #912

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efcda5a
changed conversion of yolo bbox labels
Dimfred May 27, 2021
7a3dbe0
Merge branch 'master' into master
Dipet Jun 17, 2021
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31 changes: 20 additions & 11 deletions albumentations/augmentations/bbox_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -229,26 +229,30 @@ def convert_bbox_to_albumentations(bbox, source_format, rows, cols, check_validi
(x_min, y_min, width, height), tail = bbox[:4], tuple(bbox[4:])
x_max = x_min + width
y_max = y_min + height
bbox = (x_min, y_min, x_max, y_max) + tail
bbox = normalize_bbox(bbox, rows, cols)
elif source_format == "yolo":
# https://github.com/pjreddie/darknet/blob/f6d861736038da22c9eb0739dca84003c5a5e275/scripts/voc_label.py#L12
bbox, tail = bbox[:4], tuple(bbox[4:])
_bbox = np.array(bbox[:4])
if np.any((_bbox <= 0) | (_bbox > 1)):
raise ValueError("In YOLO format all labels must be float and in range (0, 1]")

x, y, width, height = denormalize_bbox(bbox, rows, cols)
x, y, width, height = bbox[:4]
w_half, h_half = width / 2, height / 2

x_min = int(x - width / 2 + 1)
x_max = int(x_min + width)
y_min = int(y - height / 2 + 1)
y_max = int(y_min + height)
x_min, x_max = x - w_half, x + w_half
y_min, y_max = y - h_half, y + h_half

bbox = (x_min, y_min, x_max, y_max) + tail
else:
(x_min, y_min, x_max, y_max), tail = bbox[:4], tuple(bbox[4:])
bbox = (x_min, y_min, x_max, y_max) + tail
bbox = normalize_bbox(bbox, rows, cols)

bbox = (x_min, y_min, x_max, y_max) + tail
bbox = normalize_bbox(bbox, rows, cols)
if check_validity:
check_bbox(bbox)

return bbox


Expand Down Expand Up @@ -280,20 +284,25 @@ def convert_bbox_from_albumentations(bbox, target_format, rows, cols, check_vali
)
if check_validity:
check_bbox(bbox)
bbox = denormalize_bbox(bbox, rows, cols)
if target_format == "coco":
bbox = denormalize_bbox(bbox, rows, cols)
(x_min, y_min, x_max, y_max), tail = bbox[:4], tuple(bbox[4:])
width = x_max - x_min
height = y_max - y_min

bbox = (x_min, y_min, width, height) + tail
elif target_format == "yolo":
# https://github.com/pjreddie/darknet/blob/f6d861736038da22c9eb0739dca84003c5a5e275/scripts/voc_label.py#L12
(x_min, y_min, x_max, y_max), tail = bbox[:4], bbox[4:]
x = int((x_min + x_max) / 2 - 1)
y = int((y_min + y_max) / 2 - 1)

width = x_max - x_min
height = y_max - y_min
bbox = normalize_bbox((x, y, width, height) + tail, rows, cols)

x_mid = x_min + width / 2
y_mid = y_min + height / 2

bbox = (x_mid, y_mid, width, height) + tail

return bbox


Expand Down