machine-learning
machine-learning copied to clipboard
Published
20 hours ago •
HadXu
HadXu
代码疑问
def load_image(imageurl):
im = cv2.resize(cv2.imread(imageurl),(224,224)).astype(np.float32)
im[:,:,0] -= 103.939
im[:,:,1] -= 116.779
im[:,:,2] -= 123.68
im = im.transpose((2,0,1))
im = np.expand_dims(im,axis=0)
return I'm
请问这个为什么三个通道要减去这个值？ 后面的转置是什么目的？不太懂，希望大神解答下谢谢！
if data_format == 'channels_first':
# 'RGB'->'BGR'
x = x[:, ::-1, :, :]
# Zero-center by mean pixel
x[:, 0, :, :] -= 103.939
x[:, 1, :, :] -= 116.779
x[:, 2, :, :] -= 123.68
else:
# 'RGB'->'BGR'
x = x[:, :, :, ::-1]
# Zero-center by mean `pixel`
x[:, :, :, 0] -= 103.939
x[:, :, :, 1] -= 116.779
x[:, :, :, 2] -= 123.68
return x
