View Source Evision.DenseOpticalFlow (Evision v0.1.21)

Link to this section Summary

Types

t()

Type that represents an Evision.DenseOpticalFlow struct.

Functions

Calculates an optical flow.

Clears the algorithm state

Releases all inner buffers.

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

getDefaultName

Reads algorithm parameters from a file storage

simplified API for language bindings

simplified API for language bindings

Link to this section Types

@type t() :: %Evision.DenseOpticalFlow{ref: reference()}

Type that represents an Evision.DenseOpticalFlow struct.

  • ref. reference()

    The underlying erlang resource variable.

Link to this section Functions

Link to this function

calc(self, i0, i1, flow)

View Source

Calculates an optical flow.

Positional Arguments
  • self: Evision.DenseOpticalFlow.t()

  • i0: Evision.Mat.

    first 8-bit single-channel input image.

  • i1: Evision.Mat.

    second input image of the same size and the same type as prev.

Return
  • flow: Evision.Mat.

    computed flow image that has the same size as prev and type CV_32FC2.

Python prototype (for reference only):

calc(I0, I1, flow) -> flow
@spec clear(t()) :: :ok | {:error, String.t()}

Clears the algorithm state

Positional Arguments
  • self: Evision.DenseOpticalFlow.t()

Python prototype (for reference only):

clear() -> None
@spec collectGarbage(t()) :: :ok | {:error, String.t()}

Releases all inner buffers.

Positional Arguments
  • self: Evision.DenseOpticalFlow.t()

Python prototype (for reference only):

collectGarbage() -> None
@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.DenseOpticalFlow.t()
Return
  • retval: bool

Python prototype (for reference only):

empty() -> retval
@spec getDefaultName(t()) :: binary() | {:error, String.t()}

getDefaultName

Positional Arguments
  • self: Evision.DenseOpticalFlow.t()
Return

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

Reads algorithm parameters from a file storage

Positional Arguments

Python prototype (for reference only):

read(fn_) -> None
@spec save(t(), binary()) :: :ok | {:error, String.t()}

save

Positional Arguments
  • self: Evision.DenseOpticalFlow.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 write(t(), Evision.FileStorage.t()) :: :ok | {:error, String.t()}

simplified API for language bindings

Positional Arguments
Keyword Arguments

Has overloading in C++

Python prototype (for reference only):

write(fs[, name]) -> None
@spec write(t(), Evision.FileStorage.t(), [{atom(), term()}, ...] | nil) ::
  :ok | {:error, String.t()}

simplified API for language bindings

Positional Arguments
Keyword Arguments

Has overloading in C++

Python prototype (for reference only):

write(fs[, name]) -> None