Class Rotate

Inheritance Relationships

Base Type

Class Documentation

class Rotate : public mindspore::dataset::TensorTransform

Rotate the input image according to parameters.

Public Functions

explicit Rotate(FixRotationAngle angle_id = FixRotationAngle::k0Degree)

Constructor.

Example
/* Define operations */
auto decode_op = vision::Decode();
auto rotate_op = vision::Rotate(FixRotationAngle::k90Degree);

/* dataset is an instance of Dataset object */
dataset = dataset->Map({decode_op, rotate_op},  // operations
                       {"image"});              // input columns

Note

This api is only used in Lite, the interpolation mode is bilinear.

Parameters

angle_id – [in] The fix rotation angle.

  • FixRotationAngle::k0Degree = 1, Rotate 0 degree.

  • FixRotationAngle::k0DegreeAndMirror = 2, Rotate 0 degree and apply horizontal flip.

  • FixRotationAngle::k180Degree = 3, Rotate 180 degree.

  • FixRotationAngle::k180DegreeAndMirror = 4, Rotate 180 degree and apply horizontal flip.

  • FixRotationAngle::k90DegreeAndMirror = 5, Rotate 90 degree and apply horizontal flip.

  • FixRotationAngle::k90Degree = 6, Rotate 90 degree.

  • FixRotationAngle::k270DegreeAndMirror = 7, Rotate 270 degree and apply horizontal flip.

  • FixRotationAngle::k270Degree = 8, Rotate 270 degree.

explicit Rotate(float degrees, InterpolationMode resample = InterpolationMode::kNearestNeighbour, bool expand = false, const std::vector<float> &center = {}, const std::vector<uint8_t> &fill_value = {0, 0, 0})

Constructor.

Example
/* Define operations */
auto decode_op = vision::Decode();
auto rotate_op = vision::Rotate(90);

/* dataset is an instance of Dataset object */
dataset = dataset->Map({decode_op, rotate_op},  // operations
                       {"image"});              // input columns

Parameters

  • degrees – [in] A float value, representing the rotation degrees.

  • resample – [in] An enum for the mode of interpolation.

    • InterpolationMode::kLinear, Interpolation method is blinear interpolation.

    • InterpolationMode::kNearestNeighbour, Interpolation method is nearest-neighbor interpolation.

    • InterpolationMode::kCubic, Interpolation method is bicubic interpolation.

    • InterpolationMode::kArea, Interpolation method is pixel area interpolation.

  • expand – [in] A boolean representing whether the image is expanded after rotation.

  • center – [in] A float vector of size 2 or empty, representing the x and y center of rotation or the center of the image.

  • fill_value – [in] A vector representing the value to fill the area outside the transform in the output image. If 1 value is provided, it is used for all RGB channels. If 3 values are provided, it is used to fill R, G, B channels respectively.

~Rotate() = default

Destructor.