@spec create(number()) :: t() | {:error, String.t()}

create

Positional Arguments

• hessianThreshold: double.

  Threshold for hessian keypoint detector used in SURF.

Keyword Arguments

• nOctaves: int.

  Number of pyramid octaves the keypoint detector will use.

• nOctaveLayers: int.

  Number of octave layers within each octave.

• extended: bool.

  Extended descriptor flag (true - use extended 128-element descriptors; false - use 64-element descriptors).

• keypointsRatio: float.

  Limits a maximum number of features

• upright: bool.

  Up-right or rotated features flag (true - do not compute orientation of features; false - compute orientation).

Return

• retval: SURF_CUDA

Python prototype (for reference only):

create(_hessianThreshold[, _nOctaves[, _nOctaveLayers[, _extended[, _keypointsRatio[, _upright]]]]]) -> retval

@spec create(number(), [{atom(), term()}, ...] | nil) :: t() | {:error, String.t()}

create

Positional Arguments

• hessianThreshold: double.

  Threshold for hessian keypoint detector used in SURF.

Keyword Arguments

• nOctaves: int.

  Number of pyramid octaves the keypoint detector will use.

• nOctaveLayers: int.

  Number of octave layers within each octave.

• extended: bool.

  Extended descriptor flag (true - use extended 128-element descriptors; false - use 64-element descriptors).

• keypointsRatio: float.

  Limits a maximum number of features

• upright: bool.

  Up-right or rotated features flag (true - do not compute orientation of features; false - compute orientation).

Return

• retval: SURF_CUDA

Python prototype (for reference only):

create(_hessianThreshold[, _nOctaves[, _nOctaveLayers[, _extended[, _keypointsRatio[, _upright]]]]]) -> retval

@spec defaultNorm(t()) :: integer() | {:error, String.t()}

defaultNorm

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()

Return

• retval: int

Python prototype (for reference only):

defaultNorm() -> retval

@spec descriptorSize(t()) :: integer() | {:error, String.t()}

descriptorSize

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()

Return

• retval: int

Python prototype (for reference only):

descriptorSize() -> retval

@spec detect(t(), Evision.CUDA.GpuMat.t(), Evision.CUDA.GpuMat.t()) ::
  Evision.CUDA.GpuMat.t() | {:error, String.t()}

Finds the keypoints using fast hessian detector used in SURF

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()

• img: Evision.CUDA.GpuMat.t().

  Source image, currently supports only CV_8UC1 images.

• mask: Evision.CUDA.GpuMat.t().

  A mask image same size as src and of type CV_8UC1.

Return

• keypoints: Evision.CUDA.GpuMat.t().

  Detected keypoints.

Python prototype (for reference only):

detect(img, mask[, keypoints]) -> keypoints

@spec detect(
  t(),
  Evision.CUDA.GpuMat.t(),
  Evision.CUDA.GpuMat.t(),
  [{atom(), term()}, ...] | nil
) ::
  Evision.CUDA.GpuMat.t() | {:error, String.t()}

Finds the keypoints using fast hessian detector used in SURF

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()

• img: Evision.CUDA.GpuMat.t().

  Source image, currently supports only CV_8UC1 images.

• mask: Evision.CUDA.GpuMat.t().

  A mask image same size as src and of type CV_8UC1.

Return

• keypoints: Evision.CUDA.GpuMat.t().

  Detected keypoints.

Python prototype (for reference only):

detect(img, mask[, keypoints]) -> keypoints

@spec detectWithDescriptors(t(), Evision.CUDA.GpuMat.t(), Evision.CUDA.GpuMat.t()) ::
  {Evision.CUDA.GpuMat.t(), Evision.CUDA.GpuMat.t()} | {:error, String.t()}

Finds the keypoints and computes their descriptors using fast hessian detector used in SURF

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()

• img: Evision.CUDA.GpuMat.t().

  Source image, currently supports only CV_8UC1 images.

• mask: Evision.CUDA.GpuMat.t().

  A mask image same size as src and of type CV_8UC1.

Keyword Arguments

• useProvidedKeypoints: bool.

  Compute descriptors for the user-provided keypoints and recompute keypoints direction.

Return

• keypoints: Evision.CUDA.GpuMat.t().

  Detected keypoints.

• descriptors: Evision.CUDA.GpuMat.t().

  Keypoint descriptors.

Python prototype (for reference only):

detectWithDescriptors(img, mask[, keypoints[, descriptors[, useProvidedKeypoints]]]) -> keypoints, descriptors

@spec detectWithDescriptors(
  t(),
  Evision.CUDA.GpuMat.t(),
  Evision.CUDA.GpuMat.t(),
  [{atom(), term()}, ...] | nil
) :: {Evision.CUDA.GpuMat.t(), Evision.CUDA.GpuMat.t()} | {:error, String.t()}

Finds the keypoints and computes their descriptors using fast hessian detector used in SURF

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()

• img: Evision.CUDA.GpuMat.t().

  Source image, currently supports only CV_8UC1 images.

• mask: Evision.CUDA.GpuMat.t().

  A mask image same size as src and of type CV_8UC1.

Keyword Arguments

• useProvidedKeypoints: bool.

  Compute descriptors for the user-provided keypoints and recompute keypoints direction.

Return

• keypoints: Evision.CUDA.GpuMat.t().

  Detected keypoints.

• descriptors: Evision.CUDA.GpuMat.t().

  Keypoint descriptors.

Python prototype (for reference only):

detectWithDescriptors(img, mask[, keypoints[, descriptors[, useProvidedKeypoints]]]) -> keypoints, descriptors

@spec downloadKeypoints(t(), Evision.CUDA.GpuMat.t()) ::
  [Evision.KeyPoint.t()] | {:error, String.t()}

downloadKeypoints

Positional Arguments

• self: Evision.CUDA.SURFCUDA.t()
• keypointsGPU: Evision.CUDA.GpuMat.t()

Return

• keypoints: [Evision.KeyPoint]

Python prototype (for reference only):

downloadKeypoints(keypointsGPU) -> keypoints