tf.image.crop_and_resize( image, boxes, box_ind, crop_size, method='bilinear', extrapolation_value=0, name=None )
See the guide: Images > Cropping
Extracts crops from the input image tensor and bilinearly resizes them (possibly
with aspect ratio change) to a common output size specified by
crop_size. This is more general than the
crop_to_bounding_box op which extracts a fixed size slice from the input image and does not allow resizing or aspect ratio change.
Returns a tensor with
crops from the input
image at positions defined at the bounding box locations in
boxes. The cropped boxes are all resized (with bilinear interpolation) to a fixed
size = [crop_height, crop_width]. The result is a 4-D tensor
[num_boxes, crop_height, crop_width, depth]. The resizing is corner aligned. In particular, if
boxes = [[0, 0, 1, 1]], the method will give identical results to using
Tensor. Must be one of the following types:
float64. A 4-D tensor of shape
[batch, image_height, image_width, depth]. Both
image_widthneed to be positive.
float32. A 2-D tensor of shape
[num_boxes, 4]. The
i-th row of the tensor specifies the coordinates of a box in the
box_ind[i]image and is specified in normalized coordinates
[y1, x1, y2, x2]. A normalized coordinate value of
yis mapped to the image coordinate at
y * (image_height - 1), so as the
[0, 1]interval of normalized image height is mapped to
[0, image_height - 1]in image height coordinates. We do allow
y2, in which case the sampled crop is an up-down flipped version of the original image. The width dimension is treated similarly. Normalized coordinates outside the
[0, 1]range are allowed, in which case we use
extrapolation_valueto extrapolate the input image values.
int32. A 1-D tensor of shape
[num_boxes]with int32 values in
[0, batch). The value of
box_ind[i]specifies the image that the
i-th box refers to.
int32. A 1-D tensor of 2 elements,
size = [crop_height, crop_width]. All cropped image patches are resized to this size. The aspect ratio of the image content is not preserved. Both
crop_widthneed to be positive.
method: An optional
"bilinear". Defaults to
"bilinear". A string specifying the interpolation method. Only 'bilinear' is supported for now.
extrapolation_value: An optional
float. Defaults to
0. Value used for extrapolation, when applicable.
name: A name for the operation (optional).
Tensor of type
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Code samples licensed under the Apache 2.0 License.