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import numpy as np
from basicsr.utils import bgr2ycbcr
def reorder_image(img, input_order='HWC'):
"""Reorder images to 'HWC' order.
If the input_order is (h, w), return (h, w, 1);
If the input_order is (c, h, w), return (h, w, c);
If the input_order is (h, w, c), return as it is.
Args:
img (ndarray): Input image.
input_order (str): Whether the input order is 'HWC' or 'CHW'.
If the input image shape is (h, w), input_order will not have
effects. Default: 'HWC'.
Returns:
ndarray: reordered image.
"""
if input_order not in ['HWC', 'CHW']:
raise ValueError(f"Wrong input_order {input_order}. Supported input_orders are 'HWC' and 'CHW'")
if len(img.shape) == 2:
img = img[..., None]
if input_order == 'CHW':
img = img.transpose(1, 2, 0)
return img
def to_y_channel(img):
"""Change to Y channel of YCbCr.
Args:
img (ndarray): Images with range [0, 255].
Returns:
(ndarray): Images with range [0, 255] (float type) without round.
"""
img = img.astype(np.float32) / 255.
if img.ndim == 3 and img.shape[2] == 3:
img = bgr2ycbcr(img, y_only=True)
img = img[..., None]
return img * 255.
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