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Maintain aspect ratio by doing resize + crop in image_to_pb tool (#10887)

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Scott McKay 2022-03-19 07:08:45 +10:00 committed by GitHub
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2 changed files with 23 additions and 4 deletions
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2
tools/python/PythonTools.md
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@ -133,7 +133,7 @@ optional arguments:
image_to_pb:
image_to_pb specific options
--resize RESIZE Provide the shape as comma separated values to resize the image to. e.g. --shape 200,200
--resize RESIZE Provide the height and width to resize to as comma separated values. e.g. --shape 200,300 will resize to height 200 and width 300.
--channels_last Transpose image from channels first to channels last.
--add_batch_dim Prepend a batch dimension with value of 1 to the shape. i.e. convert from CHW to NCHW

25
tools/python/onnx_test_data_utils.py
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@ -52,7 +52,26 @@ def image_to_numpy(filename, shape, channels_last, add_batch_dim):
img = PIL.Image.open(filename)
if shape:
img = img.resize(shape, PIL.Image.ANTIALIAS)
w, h = img.size
new_w = shape[1]
new_h = shape[0]
# use the dimension that needs to shrink the least to resize to an image where that dimension matches the
# target size.
w_ratio = new_w / w
h_ratio = new_h / h
ratio = w_ratio if w_ratio > h_ratio else h_ratio
interim_w = int(w * ratio)
interim_h = int(h * ratio)
img = img.resize((interim_w, interim_h), PIL.Image.ANTIALIAS)
# center crop to the final target size
left = (interim_w - new_w) / 2
top = (interim_h - new_h) / 2
right = (interim_w + new_w) / 2
bottom = (interim_h + new_h) / 2
img = img.crop((left, top, right, bottom))
img_as_np = np.array(img).astype(np.float32)
if not channels_last:
# HWC to CHW
@ -110,8 +129,8 @@ def get_arg_parser():
image_to_pb_group = parser.add_argument_group('image_to_pb',
'image_to_pb specific options')
image_to_pb_group.add_argument('--resize', default=None, type=lambda s: [int(item) for item in s.split(',')],
help='Provide the shape as comma separated values to resize the image to.'
' e.g. --shape 200,200')
help='Provide the height and width to resize to as comma separated values.'
' e.g. --shape 200,300 will resize to height 200 and width 300.')
image_to_pb_group.add_argument('--channels_last', action='store_true',
help='Transpose image from channels first to channels last.')
image_to_pb_group.add_argument('--add_batch_dim', action='store_true',