System Information

OpenCV version: current Master branch
Operating System / Platform: Windows 11
Compiler & compiler version: MSVC 16

Detailed description

When trying to parse the onnx file (exported from https://github.com/baudm/parseq and simplified with https://github.com/daquexian/onnx-simplifier as recommended in the opencv doku) i get following error:

ERROR:0@0.145] global X:\ThirdPartySource\opencv_cuda\opencv\modules\dnn\src\onnx\onnx_importer.cpp (1050) cv::dnn::dnn4_v20220524::ONNXImporter::handleNode DNN/ONNX: ERROR during processing node with 2 inputs and 1 outputs: [MatMul]:(onnx_node!MatMul_859) from domain='ai.onnx'
OpenCV: terminate handler is called! The last OpenCV error is:
OpenCV(4.6.0-dev) Error: Unspecified error (> Node [MatMul@ai.onnx]:(onnx_node!MatMul_859) parse error: OpenCV(4.6.0-dev) X:\ThirdPartySource\opencv_cuda\opencv\modules\core\src\matrix_transform.cpp:245: error: (-215:Assertion failed) _src.dims() <= 2 && esz <= 32 in function 'cv::transpose'
) in cv::dnn::dnn4_v20220524::ONNXImporter::handleNode, file X:\ThirdPartySource\opencv_cuda\opencv\modules\dnn\src\onnx\onnx_importer.cpp, line 1069

The onnx it self is valid and can be used with the onnx runtime itself.
i also checked it via https://netron.app/

there seems to be 2 issues in MatMul_859 first i think opencv expect another order of the inputs.
But even if i change them i get another error here i am :)

Steps to reproduce

auto detector = cv::dnn::readNetFromONNX("ocr-sim.onnx");

weetransfer for the onnx file:

https://wetransfer.com/downloads/46d0dc6287c0d1ed000924a036400bbe20221028095359/f7770d3acc028f8006a96bced82790c920221028095418/e4e0a6

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)