View Source Evision.DNN.DetectionModel (Evision v0.1.21)

Link to this section Summary

Types

t()

Type that represents an Evision.DNN.DetectionModel struct.

Functions

Given the @p input frame, create input blob, run net and return result detections.

Given the @p input frame, create input blob, run net and return result detections.

Variant 1:

Create model from deep learning network.

Create detection model from network represented in one of the supported formats. An order of @p model and @p config arguments does not matter.

Getter for nmsAcrossClasses. This variable defaults to false, such that when non max suppression is used during the detect() function, it will do so only per-class

Given the @p input frame, create input blob, run net and return the output @p blobs.

Given the @p input frame, create input blob, run net and return the output @p blobs.

Set flag crop for frame.

Set mean value for frame.

Set preprocessing parameters for frame.

Set preprocessing parameters for frame.

Set scalefactor value for frame.

Set input size for frame.

Set flag swapRB for frame.

nmsAcrossClasses defaults to false, such that when non max suppression is used during the detect() function, it will do so per-class. This function allows you to toggle this behaviour.

Link to this section Types

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

Type that represents an Evision.DNN.DetectionModel struct.

  • ref. reference()

    The underlying erlang resource variable.

Link to this section Functions

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

Given the @p input frame, create input blob, run net and return result detections.

Positional Arguments
Keyword Arguments
  • confThreshold: float.

    A threshold used to filter boxes by confidences.

  • nmsThreshold: float.

    A threshold used in non maximum suppression.

Return
  • classIds: [int].

    Class indexes in result detection.

  • confidences: [float].

    A set of corresponding confidences.

  • boxes: [Rect].

    A set of bounding boxes.

Python prototype (for reference only):

detect(frame[, confThreshold[, nmsThreshold]]) -> classIds, confidences, boxes
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detect(self, frame, opts)

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

Given the @p input frame, create input blob, run net and return result detections.

Positional Arguments
Keyword Arguments
  • confThreshold: float.

    A threshold used to filter boxes by confidences.

  • nmsThreshold: float.

    A threshold used in non maximum suppression.

Return
  • classIds: [int].

    Class indexes in result detection.

  • confidences: [float].

    A set of corresponding confidences.

  • boxes: [Rect].

    A set of bounding boxes.

Python prototype (for reference only):

detect(frame[, confThreshold[, nmsThreshold]]) -> classIds, confidences, boxes
@spec detectionModel(Evision.DNN.Net.t()) :: t() | {:error, String.t()}
@spec detectionModel(binary()) :: t() | {:error, String.t()}

Variant 1:

Create model from deep learning network.

Positional Arguments
Return

Python prototype (for reference only):

DetectionModel(network) -> <dnn_DetectionModel object>

Variant 2:

Create detection model from network represented in one of the supported formats. An order of @p model and @p config arguments does not matter.

Positional Arguments
  • model: String.

    Binary file contains trained weights.

Keyword Arguments
  • config: String.

    Text file contains network configuration.

Return

Python prototype (for reference only):

DetectionModel(model[, config]) -> <dnn_DetectionModel object>
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detectionModel(model, opts)

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

Create detection model from network represented in one of the supported formats. An order of @p model and @p config arguments does not matter.

Positional Arguments
  • model: String.

    Binary file contains trained weights.

Keyword Arguments
  • config: String.

    Text file contains network configuration.

Return

Python prototype (for reference only):

DetectionModel(model[, config]) -> <dnn_DetectionModel object>
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getNmsAcrossClasses(self)

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

Getter for nmsAcrossClasses. This variable defaults to false, such that when non max suppression is used during the detect() function, it will do so only per-class

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()
Return
  • retval: bool

Python prototype (for reference only):

getNmsAcrossClasses() -> retval
@spec predict(t(), Evision.Mat.maybe_mat_in()) ::
  [Evision.Mat.t()] | {:error, String.t()}

Given the @p input frame, create input blob, run net and return the output @p blobs.

Positional Arguments
Return
  • outs: [Evision.Mat].

    Allocated output blobs, which will store results of the computation.

Python prototype (for reference only):

predict(frame[, outs]) -> outs
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predict(self, frame, opts)

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

Given the @p input frame, create input blob, run net and return the output @p blobs.

Positional Arguments
Return
  • outs: [Evision.Mat].

    Allocated output blobs, which will store results of the computation.

Python prototype (for reference only):

predict(frame[, outs]) -> outs
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setInputCrop(self, crop)

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@spec setInputCrop(t(), boolean()) :: Evision.DNN.Model.t() | {:error, String.t()}

Set flag crop for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • crop: bool.

    Flag which indicates whether image will be cropped after resize or not.

Return

Python prototype (for reference only):

setInputCrop(crop) -> retval
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setInputMean(self, mean)

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@spec setInputMean(
  t(),
  {number()}
  | {number(), number()}
  | {number() | number() | number()}
  | {number(), number(), number(), number()}
) :: Evision.DNN.Model.t() | {:error, String.t()}

Set mean value for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • mean: Scalar.

    Scalar with mean values which are subtracted from channels.

Return

Python prototype (for reference only):

setInputMean(mean) -> retval
@spec setInputParams(t()) :: :ok | {:error, String.t()}

Set preprocessing parameters for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()
Keyword Arguments
  • scale: double.

    Multiplier for frame values.

  • size: Size.

    New input size.

  • mean: Scalar.

    Scalar with mean values which are subtracted from channels.

  • swapRB: bool.

    Flag which indicates that swap first and last channels.

  • crop: bool.

    Flag which indicates whether image will be cropped after resize or not. blob(n, c, y, x) = scale * resize( frame(y, x, c) ) - mean(c) )

Python prototype (for reference only):

setInputParams([, scale[, size[, mean[, swapRB[, crop]]]]]) -> None
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setInputParams(self, opts)

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

Set preprocessing parameters for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()
Keyword Arguments
  • scale: double.

    Multiplier for frame values.

  • size: Size.

    New input size.

  • mean: Scalar.

    Scalar with mean values which are subtracted from channels.

  • swapRB: bool.

    Flag which indicates that swap first and last channels.

  • crop: bool.

    Flag which indicates whether image will be cropped after resize or not. blob(n, c, y, x) = scale * resize( frame(y, x, c) ) - mean(c) )

Python prototype (for reference only):

setInputParams([, scale[, size[, mean[, swapRB[, crop]]]]]) -> None
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setInputScale(self, scale)

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@spec setInputScale(t(), number()) :: Evision.DNN.Model.t() | {:error, String.t()}

Set scalefactor value for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • scale: double.

    Multiplier for frame values.

Return

Python prototype (for reference only):

setInputScale(scale) -> retval
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setInputSize(self, size)

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@spec setInputSize(
  t(),
  {number(), number()}
) :: Evision.DNN.Model.t() | {:error, String.t()}

Set input size for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • size: Size.

    New input size.

Return

Note: If shape of the new blob less than 0, then frame size not change.

Python prototype (for reference only):

setInputSize(size) -> retval
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setInputSize(self, width, height)

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@spec setInputSize(t(), integer(), integer()) ::
  Evision.DNN.Model.t() | {:error, String.t()}

setInputSize

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • width: int.

    New input width.

  • height: int.

    New input height.

Return

Has overloading in C++

Python prototype (for reference only):

setInputSize(width, height) -> retval
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setInputSwapRB(self, swapRB)

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@spec setInputSwapRB(t(), boolean()) :: Evision.DNN.Model.t() | {:error, String.t()}

Set flag swapRB for frame.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • swapRB: bool.

    Flag which indicates that swap first and last channels.

Return

Python prototype (for reference only):

setInputSwapRB(swapRB) -> retval
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setNmsAcrossClasses(self, value)

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

nmsAcrossClasses defaults to false, such that when non max suppression is used during the detect() function, it will do so per-class. This function allows you to toggle this behaviour.

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()

  • value: bool.

    The new value for nmsAcrossClasses

Return

Python prototype (for reference only):

setNmsAcrossClasses(value) -> retval
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setPreferableBackend(self, backendId)

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@spec setPreferableBackend(t(), integer()) ::
  Evision.DNN.Model.t() | {:error, String.t()}

setPreferableBackend

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()
  • backendId: dnn_Backend
Return

Python prototype (for reference only):

setPreferableBackend(backendId) -> retval
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setPreferableTarget(self, targetId)

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@spec setPreferableTarget(t(), integer()) ::
  Evision.DNN.Model.t() | {:error, String.t()}

setPreferableTarget

Positional Arguments
  • self: Evision.DNN.DetectionModel.t()
  • targetId: dnn_Target
Return

Python prototype (for reference only):

setPreferableTarget(targetId) -> retval