OPID

This release contains the OPID images from the local Linear_RGB_Polar RLP collection, with the original training and test split preserved.

Structure

train/OPID001/{0,45,90,135}.png
...
test/OPID071/{0,45,90,135}.png
...

Each scene contains four PNG images named for polarization angles in degrees: 0, 45, 90, and 135. Files are uploaded without image conversion.

All 320 images are 8-bit RGB PNG files. Image dimensions are 1024 x 1024 (264 images), 2048 x 2048 (48 images), or 2448 x 2048 (8 images).

Split	Scenes	PNG files	Bytes
train	72	288	556561531
test	8	32	35695840

Training scenes: OPID001 through OPID070, OPID079, and OPID080. Test scenes: OPID071 through OPID078.

License: CC-BY-4.0.

The accompanying manifest.json records each image's repository path, byte size, and SHA-256 checksum.

Citation

If you use this dataset in your research, please cite:

@article{luo2026updem,
  title   = {UP-Dem: Deep Unrolling Convolutional Sparse Coding for Color Polarization Image Demosaicking},
  author  = {Luo, Yidong and Wu, Caiyun and Li, Chenggong and Wang, Ping and Yuan, Xin and Yang, Kailun and Zhang, Junchao},
  journal = {IEEE Transactions on Image Processing},
  year    = {2026},
  volume  = {35},
  number  = {},
  pages   = {10152-10166},
  doi     = {10.1109/TIP.2026.3730838}
}