OpenCV 5.0.0-pre
Open Source Computer Vision
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This subsection of dnn module contains information about built-in layers and their descriptions.
Classes listed here, in fact, provides C++ API for creating instances of built-in layers. In addition to this way of layers instantiation, there is a more common factory API (see Utilities for New Layers Registration), it allows to create layers dynamically (by name) and register new ones. You can use both API, but factory API is less convenient for native C++ programming and basically designed for use inside importers (see readNetFromCaffe(), readNetFromTensorflow()).
Built-in layers partially reproduce functionality of corresponding ONNX, TensorFlow and Caffe layers. In particular, the following layers and Caffe importer were tested to reproduce Caffe functionality: