@spec clear(Keyword.t()) :: any() | {:error, String.t()}

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

Clears the algorithm state

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Python prototype (for reference only):

clear() -> None

@spec detect(t(), Evision.Mat.maybe_mat_in()) ::
  Evision.Mat.t() | {:error, String.t()}

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

Variant 1:

Finds edges in an image using the @cite Canny86 algorithm.

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• image: Evision.Mat.

  Single-channel 8-bit input image.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.Mat.t().

  Output edge map. It has the same size and type as image.

Python prototype (for reference only):

detect(image[, edges[, stream]]) -> edges

Variant 2:

Finds edges in an image using the @cite Canny86 algorithm.

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• image: Evision.CUDA.GpuMat.t().

  Single-channel 8-bit input image.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.CUDA.GpuMat.t().

  Output edge map. It has the same size and type as image.

Python prototype (for reference only):

detect(image[, edges[, stream]]) -> edges

@spec detect(t(), Evision.Mat.maybe_mat_in(), [{:stream, term()}] | nil) ::
  Evision.Mat.t() | {:error, String.t()}

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

@spec detect(t(), Evision.Mat.maybe_mat_in(), Evision.Mat.maybe_mat_in()) ::
  Evision.Mat.t() | {:error, String.t()}

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

Variant 1:

detect

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• dx: Evision.Mat.

  First derivative of image in the vertical direction. Support only CV_32S type.

• dy: Evision.Mat.

  First derivative of image in the horizontal direction. Support only CV_32S type.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.Mat.t().

  Output edge map. It has the same size and type as image.

Has overloading in C++

Python prototype (for reference only):

detect(dx, dy[, edges[, stream]]) -> edges

Variant 2:

detect

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• dx: Evision.CUDA.GpuMat.t().

  First derivative of image in the vertical direction. Support only CV_32S type.

• dy: Evision.CUDA.GpuMat.t().

  First derivative of image in the horizontal direction. Support only CV_32S type.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.CUDA.GpuMat.t().

  Output edge map. It has the same size and type as image.

Has overloading in C++

Python prototype (for reference only):

detect(dx, dy[, edges[, stream]]) -> edges

Variant 3:

Finds edges in an image using the @cite Canny86 algorithm.

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• image: Evision.Mat.

  Single-channel 8-bit input image.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.Mat.t().

  Output edge map. It has the same size and type as image.

Python prototype (for reference only):

detect(image[, edges[, stream]]) -> edges

Variant 4:

Finds edges in an image using the @cite Canny86 algorithm.

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• image: Evision.CUDA.GpuMat.t().

  Single-channel 8-bit input image.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.CUDA.GpuMat.t().

  Output edge map. It has the same size and type as image.

Python prototype (for reference only):

detect(image[, edges[, stream]]) -> edges

@spec detect(
  t(),
  Evision.Mat.maybe_mat_in(),
  Evision.Mat.maybe_mat_in(),
  [{:stream, term()}] | nil
) ::
  Evision.Mat.t() | {:error, String.t()}

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

Variant 1:

detect

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• dx: Evision.Mat.

  First derivative of image in the vertical direction. Support only CV_32S type.

• dy: Evision.Mat.

  First derivative of image in the horizontal direction. Support only CV_32S type.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.Mat.t().

  Output edge map. It has the same size and type as image.

Has overloading in C++

Python prototype (for reference only):

detect(dx, dy[, edges[, stream]]) -> edges

Variant 2:

detect

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

• dx: Evision.CUDA.GpuMat.t().

  First derivative of image in the vertical direction. Support only CV_32S type.

• dy: Evision.CUDA.GpuMat.t().

  First derivative of image in the horizontal direction. Support only CV_32S type.

Keyword Arguments

• stream: Evision.CUDA.Stream.t().

  Stream for the asynchronous version.

Return

• edges: Evision.CUDA.GpuMat.t().

  Output edge map. It has the same size and type as image.

Has overloading in C++

Python prototype (for reference only):

detect(dx, dy[, edges[, stream]]) -> edges

@spec empty(Keyword.t()) :: any() | {:error, String.t()}

@spec empty(t()) :: boolean() | {:error, String.t()}

Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Return

• retval: bool

Python prototype (for reference only):

empty() -> retval

@spec getAppertureSize(Keyword.t()) :: any() | {:error, String.t()}

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

getAppertureSize

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Return

• retval: integer()

Python prototype (for reference only):

getAppertureSize() -> retval

@spec getDefaultName(Keyword.t()) :: any() | {:error, String.t()}

@spec getDefaultName(t()) :: binary() | {:error, String.t()}

getDefaultName

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Return

• retval: String

Returns the algorithm string identifier. This string is used as top level xml/yml node tag when the object is saved to a file or string.

Python prototype (for reference only):

getDefaultName() -> retval

@spec getHighThreshold(Keyword.t()) :: any() | {:error, String.t()}

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

getHighThreshold

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Return

• retval: double

Python prototype (for reference only):

getHighThreshold() -> retval

@spec getL2Gradient(Keyword.t()) :: any() | {:error, String.t()}

@spec getL2Gradient(t()) :: boolean() | {:error, String.t()}

getL2Gradient

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Return

• retval: bool

Python prototype (for reference only):

getL2Gradient() -> retval

@spec getLowThreshold(Keyword.t()) :: any() | {:error, String.t()}

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

getLowThreshold

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()

Return

• retval: double

Python prototype (for reference only):

getLowThreshold() -> retval

@spec read(t(), Evision.FileNode.t()) :: t() | {:error, String.t()}

Reads algorithm parameters from a file storage

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• func: Evision.FileNode

Python prototype (for reference only):

read(fn) -> None

@spec save(t(), binary()) :: t() | {:error, String.t()}

save

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• filename: String

Saves the algorithm to a file. In order to make this method work, the derived class must implement Algorithm::write(FileStorage& fs).

Python prototype (for reference only):

save(filename) -> None

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

setAppertureSize

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• apperture_size: integer()

Python prototype (for reference only):

setAppertureSize(apperture_size) -> None

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

setHighThreshold

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• high_thresh: double

Python prototype (for reference only):

setHighThreshold(high_thresh) -> None

@spec setL2Gradient(t(), boolean()) :: t() | {:error, String.t()}

setL2Gradient

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• l2gradient: bool

Python prototype (for reference only):

setL2Gradient(L2gradient) -> None

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

setLowThreshold

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• low_thresh: double

Python prototype (for reference only):

setLowThreshold(low_thresh) -> None

@spec write(t(), Evision.FileStorage.t()) :: t() | {:error, String.t()}

Stores algorithm parameters in a file storage

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• fs: Evision.FileStorage

Python prototype (for reference only):

write(fs) -> None

@spec write(t(), Evision.FileStorage.t(), binary()) :: t() | {:error, String.t()}

write

Positional Arguments

• self: Evision.CUDA.CannyEdgeDetector.t()
• fs: Evision.FileStorage
• name: String

Has overloading in C++

Python prototype (for reference only):

write(fs, name) -> None