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⚡️ Speed up function _scale_bounding_box_to_original_image_shape by 12% #43

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⚡️ Speed up function _scale_bounding_box_to_original_image_shape by 12% #43

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19 changes: 11 additions & 8 deletions ultralytics/utils/ops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -422,10 +422,9 @@ def xyxy2xywh(x):
"""
assert x.shape[-1] == 4, f"input shape last dimension expected 4 but input shape is {x.shape}"
y = empty_like(x) # faster than clone/copy
y[..., 0] = (x[..., 0] + x[..., 2]) / 2 # x center
y[..., 1] = (x[..., 1] + x[..., 3]) / 2 # y center
y[..., 2] = x[..., 2] - x[..., 0] # width
y[..., 3] = x[..., 3] - x[..., 1] # height
# Use advanced indexing for memory locality and speed
y[..., :2] = (x[..., :2] + x[..., 2:]) / 2
y[..., 2:] = x[..., 2:] - x[..., :2]
return y


Expand Down Expand Up @@ -466,10 +465,14 @@ def xywhn2xyxy(x, w=640, h=640, padw=0, padh=0):
"""
assert x.shape[-1] == 4, f"input shape last dimension expected 4 but input shape is {x.shape}"
y = empty_like(x) # faster than clone/copy
y[..., 0] = w * (x[..., 0] - x[..., 2] / 2) + padw # top left x
y[..., 1] = h * (x[..., 1] - x[..., 3] / 2) + padh # top left y
y[..., 2] = w * (x[..., 0] + x[..., 2] / 2) + padw # bottom right x
y[..., 3] = h * (x[..., 1] + x[..., 3] / 2) + padh # bottom right y
c_x = x[..., 0]
c_y = x[..., 1]
w_box = x[..., 2]
h_box = x[..., 3]
y[..., 0] = w * (c_x - w_box / 2) + padw
y[..., 1] = h * (c_y - h_box / 2) + padh
y[..., 2] = w * (c_x + w_box / 2) + padw
y[..., 3] = h * (c_y + h_box / 2) + padh
return y


Expand Down