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ON THIS PAGE

  • Cast
  • Node properties
  • How to place it
  • Inputs and Outputs
  • Usage
  • Examples of functionality
  • Reference

Cast

Cast Node is used to convert NNData messages to ImgFrame. This is useful in cases where applications need to use outputs from a NeuralNetwork node to be fed into nodes that only accept ImgFrame.

Node properties

  • outputFrameType - The type of the output frame. The type should be the same as the NN output frame type.
  • offset - The offset to be applied to the output frame. Default is 0.
  • scale - The scale factor to be applied to the output frame. Default is 1.
Offset and scale are used to define a linear transformation of the pixel values. The formula is output = input * scale + offset.

How to place it

Python
C++
Python
1pipeline = dai.Pipeline()
2cast = pipeline.create(dai.node.Cast)

Inputs and Outputs

Command Line
1/
2              ┌───────────┐    out
3              |           ├────────►
4              │           │ 
5     input    |    Cast   | passthroughInput
6  ───────────►│-----------├────────►
7              │           │
8              └───────────┘
Message types

Usage

Python
C++
Python
1pipeline = dai.Pipeline()
2
3nn = pipeline.create(dai.node.NeuralNetwork)
4# Load a custom blob
5nn.setBlobPath("path_to_blob")
6
7cast = pipeline.create(dai.node.Cast)
8cast.setOutputFrameType(dai.ImgFrame.Type.BGR888p)
9cast.setScale(1)
10
11# Link the output of NN to the input of Cast
12nn.out.link(cast.input)
13
14# Send the casted output to a host via XLink
15xout = pipeline.create(dai.node.XLinkOut)
16xout.setStreamName("castOut")
17cast.output.link(xout.input)

Examples of functionality

Reference

class

depthai.node.Cast(depthai.Node)

method
setNumFramesPool(self, arg0: int) -> Cast: Cast
Set number of frames in pool

Parameter ``numFramesPool``:
    Number of frames in pool
method
setOffset(self, arg0: float) -> Cast: Cast
Set offset

Parameter ``offset``:
    Offset
method
setOutputFrameType(self, arg0: depthai.RawImgFrame.Type) -> Cast: Cast
Set output frame type

Parameter ``outputType``:
    Output frame type
method
setScale(self, arg0: float) -> Cast: Cast
Set scale

Parameter ``scale``:
    Scale
property
input
Input NNData or ImgFrame message.
property
output
Output ImgFrame message.
property
passthroughInput
Passthrough input message.

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