A lossless, RGB, QR encoder and decoder built with convolutions and a custom deconvolution.

It achieves a significant density increase over traditional QR codes as it can be seen in the next image:

Both matrix barcodes encode the same amount of data (220 bytes), but the DQR occupies less than 1/9th of the pixels that the traditional QR does.

• Q: By relying on RGB doesn't that make it less reliable and sensible to noise?

A: Though it uses the whole RGB spectrum to encode data, it's actually robust to variations as it works with ranges of colors rather than specific color values. By training the network with noisy data, you can guarantee a certain noise tolerance.

• Q: How is it lossless? If neural networks always have errors

A: Yes, neural networks have errors, however, by minimizing the L1 loss (MAE) between the decoded and the target tensors until it reaches errors of less than 1e-3, you can have a very high certainty that when the decoded tensor is converted to 1s and 0s, there's no resulting error.

This can be verified by testing the model, which measures exact match between the decoded and target binary strings. You should obtain an accuracy of 100% over a significant test set.

Install requirements with pip install -r requirements.txt.

Train with python train.py, this will save an encoder and decoder model that you can then use with python encode.py file_path and python decode.py file_path out_name.

To use the pretrained model, remove the .3x from the models at the models folder

• Increase downscaling multiplier. Currently at 3x.
• Test/improve tolerance to noise.
• Improve determining whether the model is lossless or not.
• Train for decoding with mobile cameras.
  • Implement position, alignment and timing patterns, though the network might discover that by itself.

This whole README is encoded in the following DQR code.

And decoding it yields the same text back, as expected.