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README.md

gcrf

Fast, Exact and Multi-Scale Inference for Semantic Image Segmentation with Deep Gaussian CRFs

Find the pdf of the latest ArXiV report here.

To cite the paper, please use

@inproceedings{ChandraEccv2016,
title={Fast, Exact and Multi-Scale Inference for Semantic Image Segmentation with Deep Gaussian CRFs},
author={Siddhartha Chandra and Iasonas Kokkinos},
journal={ECCV},
year={2016}
}

This is the implementation of the Potts type G-CRF caffe layer as introduced in the paper. We use deeplab-V2 resnets-101 in conjunction with the Potts type G-CRF module for learning pairwise terms. The pairwise terms are drawn from a single (parallem) branch of the resnet-101. Follow these steps to reproduce our 80.2% IoU on VOC 2012 test set.

  1. Change the PATH to the VOC Dataset in scripts/resources/test_rtf_release.prototxt, scripts/flip_images.m, scripts/apply_dense_crf.m, scripts/average_lr.m
  2. Compile caffe (caffe_deeplab2_lightweight)
  3. Compile dense-crf (scripts/resources/densecrf)
  4. For the remainder of the steps, go into the scripts directory as all paths in the scripts are relative. cd scripts
  5. Download the trained caffemodel from here, and place it into the scripts/resources directory.
  6. Flip test images
    • We flip test images horizontally, and then average the scores. Use the matlab script: scripts/flip_images.m
  7. Score images using trained model.
    • Use the bash script scripts/score_images.sh
    • The results are written to scripts/results/release
  8. Average the flipped scores, generate results without crf.
    • Use the matlab script: scripts/average_lr.m
    • The averaged scores are written to scripts/results/scores
    • The segmentation maps without dense CRF are written to scripts/results/nocrf
    • The segmentation maps without dense CRF achieve 79.5 mean pixel IoU on VOC2012 test set.
    • The results are here
  9. Apply dense CRF for object edge refinement.
    • Use the matlab script: scripts/apply_dense_crf.m
    • The densecrf post processed segmentations are written to scripts/results/crf
    • The densecrf post processed segmentation maps achieve 80.2 mean pixel IoU on VOC2012 test set.
    • The results are here

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