Added WeChatQR-fix ONNX models

[omrope79]

Merge with PR opencv/opencv#28746

[asmorkalov]

1. I propose to decouple the data on 2 prs: PR with new layers, PR with WeChat model files.
2. For all new models we need source of the model and legal information. Small models are usually generated by Torch or ONNXScript or other trusted tool. See https://github.com/opencv/opencv_extra/blob/4.x/testdata/dnn/onnx/generate_onnx_models.py and https://github.com/opencv/opencv_extra/blob/4.x/testdata/dnn/onnx/generate_onnx_models_with_onnxscript.py. For the ONNX model converted from Caffe we need general instruction how to do it. I propose to submit a PR to main repo docs or Wiki page. For the last case you can share google doc with instruction or some other file.

[dkurt]

Please also provide a short guide of how model converted from Caffe to ONNX

[omrope79]

I've removed the extra models from this branch and moved them to a dedicated PR here: #1349. Thanks!

[dkurt]

@omrope79 does it mean this PR can be closed?

[abhishek-gola]

@omrope79 does it mean this PR can be closed?

This PR contains ONNX models for Wechat converted from caffe, required for this PR: opencv/opencv#28746

[dkurt]

Is that possible to add a guide how to export these models in ONNX? At least in https://github.com/omrope79/opencv-test-models/ README.md

[abhishek-gola]

Is that possible to add a guide how to export these models in ONNX? At least in https://github.com/omrope79/opencv-test-models/ README.md

There is this PR (https://huggingface.co/opencv/opencv_contribution/discussions/3/files) on OpenCV hugging face, which has all the scripts.

[asmorkalov]

@abhishek-gola Please add requirements.txt to the Higgingface repo. List if required packages is not clean. Also please add documentation page or wiki page about conversion steps. Users most probably have a lot of old models that they want to use with OpenCV 5.

[dkurt]

Can we use huggingface URLs to download models?

[asmorkalov]

Generally yes, but our CI has access issues with it (firewall). It'll be great to have alternative links to, if possible.