Adds the option to enable delay loading of CUDA DLLs on Windows. This is particularly useful to use the same binary on systems with and without CUDA support without distributing the CUDA DLLs to systems that cannot use them at all due to missing CUDA-supported hardware.
Resolves #13509

QR code, reduce extra adaptiveThreshold()

optimize winograd futher more

Address CUDA-related errors

Trigger on "category: dnn (onnx)" label

Setting CAP_PROP_AUTO_EXPOSURE on VideoCapture with backend DSHOW does not change anything. Now with this implementation the property can be used with value 1 for availability.

DNN: supports Scatter and ScatterND from ONNX

cosmetic changes

Parsing quantized nodes does not rely on names

DNN: Make Unsqueeze layer support negative axes

docs: prefer # for links generation

- avoid `@ref`
- align with 4.x branch (minimize merge conflicts)

Workflow Ubuntu 20.04 x64 with CUDA support (4.x)

Support use memory buffer to read multi-page image

DNN: add enableWinograd API for Net

Opencv.js: on imread add willReadFrequently to getContext

DNN: support GreaterOrEqual and LessOrEqual op in ONNX

added blob contours to blob detector

* added blob contours

* Fixed Java regression test after new parameter addition to SimpleBlobDetector.

* Added stub implementation of SimpleBlobDetector::getBlobContours to presume source API compatibility.