Implement native QRCodeDetector

[edgarriba]

Create a native implementation of QR detector similar to OpenCV QRCodeDetector requested by user in discord.

Ideally as separated crate kornia-qr within the parent worksapce.

[jaydon2020]

Hi, anyone working on this issue? I would like to work on this issue.
@edgarriba cloud you provide me more detail and assign me to this issue.

start to create a new crate

cargo new kornia-qr --bin

About the detect and decode what data types should I return? any suggestion?

detectAndDecodeCurved(&self, input_image: Image<u8, 3>) -> retval, points, straight_qrcode
retval: String // Decoded data
points: Tensor<f32, 4> // box binding of the qr code found
straight_qrcode: Image<u8, 3> // rectifiedImage

References
https://github.com/opencv/opencv/blob/4.x/modules/objdetect/src/qrcode.cpp
https://github.com/dignifiedquire/quircs/tree/master

[edgarriba]

Hi, sounds good to me if you want to give it a shot. What’s exactly retval as String ? Also for simplicity I would return for now a vec<[[f32; 2]; 4]> for the points. Are you planning to write from scratch, or use any other library ? Let’s minimise as much as possible the deps tree

[pratheekhassan21]

Hi,@edgarriba is jaydon2020 working on this issue?Can i work on this issue if u can help me?i was thinking of contributing to the kornia rs for gsoc 2025

[jaydon2020]

@edgarriba, I do some research this library working well on QRCode detect

• quircs
• rqrr

Since minimize as much as possible the deps tree, I will manually port it from OpenCV QRCode Detect.

Also, the OpenCV implement an abstract class GraphicalCodeDetector for QRCode, do we need to follow similar approach so that it provide an trait for future implementation like barcode or aruco detection

[edgarriba]

@jaydon2020 sounds like a plan