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

Clears the algorithm state

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Python prototype (for reference only):

clear() -> None

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

Detects edges in a grayscale image and prepares them to detect lines and ellipses.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

• src: Evision.Mat.t().

  8-bit, single-channel, grayscale input image.

Python prototype (for reference only):

detectEdges(src) -> None

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

Detects circles and ellipses.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• ellipses: Evision.Mat.t().

  output Vec<6d> contains center point and perimeter for circles, center point, axes and angle for ellipses.

Note: you should call detectEdges() before calling this function.

Python prototype (for reference only):

detectEllipses([, ellipses]) -> ellipses

@spec detectEllipses(t(), [{atom(), term()}, ...] | nil) ::
  Evision.Mat.t() | {:error, String.t()}

Detects circles and ellipses.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• ellipses: Evision.Mat.t().

  output Vec<6d> contains center point and perimeter for circles, center point, axes and angle for ellipses.

Note: you should call detectEdges() before calling this function.

Python prototype (for reference only):

detectEllipses([, ellipses]) -> ellipses

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

Detects lines.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• lines: Evision.Mat.t().

  output Vec<4f> contains the start point and the end point of detected lines.

Note: you should call detectEdges() before calling this function.

Python prototype (for reference only):

detectLines([, lines]) -> lines

@spec detectLines(t(), [{atom(), term()}, ...] | nil) ::
  Evision.Mat.t() | {:error, String.t()}

Detects lines.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• lines: Evision.Mat.t().

  output Vec<4f> contains the start point and the end point of detected lines.

Note: you should call detectEdges() before calling this function.

Python prototype (for reference only):

detectLines([, lines]) -> lines

@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.XImgProc.EdgeDrawing.t()

Return

• retval: bool

Python prototype (for reference only):

empty() -> retval

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

getDefaultName

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.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 getEdgeImage(t()) :: Evision.Mat.t() | {:error, String.t()}

returns Edge Image prepared by detectEdges() function.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• dst: Evision.Mat.t().

  returns 8-bit, single-channel output image.

Python prototype (for reference only):

getEdgeImage([, dst]) -> dst

@spec getEdgeImage(t(), [{atom(), term()}, ...] | nil) ::
  Evision.Mat.t() | {:error, String.t()}

returns Edge Image prepared by detectEdges() function.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• dst: Evision.Mat.t().

  returns 8-bit, single-channel output image.

Python prototype (for reference only):

getEdgeImage([, dst]) -> dst

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

returns Gradient Image prepared by detectEdges() function.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• dst: Evision.Mat.t().

  returns 16-bit, single-channel output image.

Python prototype (for reference only):

getGradientImage([, dst]) -> dst

@spec getGradientImage(t(), [{atom(), term()}, ...] | nil) ::
  Evision.Mat.t() | {:error, String.t()}

returns Gradient Image prepared by detectEdges() function.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• dst: Evision.Mat.t().

  returns 16-bit, single-channel output image.

Python prototype (for reference only):

getGradientImage([, dst]) -> dst

@spec getSegmentIndicesOfLines(t()) :: [integer()] | {:error, String.t()}

Returns for each line found in detectLines() its edge segment index in getSegments()

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• retval: [int]

Python prototype (for reference only):

getSegmentIndicesOfLines() -> retval

@spec getSegments(t()) :: [[{number(), number()}]] | {:error, String.t()}

Returns std::vector<std::vector<Point>> of detected edge segments, see detectEdges()

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

Return

• retval: [[Point]]

Python prototype (for reference only):

getSegments() -> retval

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

Reads algorithm parameters from a file storage

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()
• fn_: Evision.FileNode.t()

Python prototype (for reference only):

read(fn_) -> None

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

save

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.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 setParams(t(), Evision.XImgProc.EdgeDrawing.Params.t()) ::
  t() | {:error, String.t()}

sets parameters.

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()

• parameters: Evision.XImgProc.EdgeDrawing.Params.t().

  Parameters of the algorithm

this function is meant to be used for parameter setting in other languages than c++ like python.

Python prototype (for reference only):

setParams(parameters) -> None

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

Stores algorithm parameters in a file storage

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()
• fs: Evision.FileStorage.t()

Python prototype (for reference only):

write(fs) -> None

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

write

Positional Arguments

• self: Evision.XImgProc.EdgeDrawing.t()
• fs: Evision.FileStorage.t()
• name: String

Has overloading in C++

Python prototype (for reference only):

write(fs, name) -> None