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use opencv instead of numpy to subtract pixel means #50

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use opencv instead of numpy to subtract pixel means #50

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4642f6b
use opencv instead of numpy to subtract pixel means
vesor Jan 27, 2018
066c1d0
use opencv instead of numpy to subtract pixel means
vesor Jan 27, 2018
99a0f5f
Merge branch 'master' of https://github.com/facebookresearch/Detectro…
May 16, 2018
7588490
Merge branch 'master' into topics/cv_subtract_mean
May 16, 2018
874e885
remove the commented line
May 16, 2018
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2 changes: 1 addition & 1 deletion detectron/utils/blob.py
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,7 @@ def prep_im_for_blob(im, pixel_means, target_size, max_size):
the scale factors that were used to compute each returned image.
"""
im = im.astype(np.float32, copy=False)
im -= pixel_means
im = cv2.subtract(im, pixel_means.reshape((1,) + im.shape[-1:]))
im_shape = im.shape
im_size_min = np.min(im_shape[0:2])
im_size_max = np.max(im_shape[0:2])
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