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SpixelFCN: Superpixel Segmentation with Fully Convolutional Network

This is is a PyTorch implementation of the superpixel segmentation network introduced in our CVPR-20 paper:

Superpixel Segmentation with Fully Convolutional Network

Fengting Yang, Qian Sun, Hailin Jin, and Zihan Zhou

Please contact Fengting Yang ( if you have any questions.

NEWS: The stereo application is available in our SPPSMNet repository.


The training code was mainly developed and tested with python 2.7, PyTorch 0.4.1, CUDA 9, and Ubuntu 16.04.

In the test, we make use of the component connection method in SSN to enforce the connectivity in superpixels. The code has been included in /third_paty/cython. To compile it:

cd third_party/cython/
python install --user
cd ../..


The demo script provides the superpixels with a grid size of 16 x 16 using our pre-trained model (in /pretrained_ckpt). Please feel free to provide your own images by copying them into /demo/inputs, and run

python --data_dir=./demo/inputs --data_suffix=jpg --output=./demo 

The results will be generated in a new folder under /demo called spixel_viz.

Data preparation

To generate the training and test dataset, please first download the data from the original BSDS500 dataset, and extract it to <BSDS_DIR>. Then, run

cd data_preprocessing
python --dataset=<BSDS_DIR> --dump_root=<DUMP_DIR>
python --dataset=<BSDS_DIR> --dump_root=<DUMP_DIR>
cd ..

The code will generate three folders under the <DUMP_DIR>, named as /train, /val, and /test, and three .txt files record the absolute path of the images, named as train.txt, val.txt, and test.txt.


Once the data is prepared, we should be able to train the model by running the following command

python --data=<DUMP_DIR> --savepath=<CKPT_LOG_DIR>

if we wish to continue a training process or fine-tune from a pre-trained model, we can run

python --data=<DUMP_DIR> --savepath=<CKPT_LOG_DIR> --pretrained=<PATH_TO_THE_CKPT> 

The code will start from the recorded status, which includes the optimizer status and epoch number.

The training log can be viewed from the tensorboard session by running

tensorboard --logdir=<CKPT_LOG_DIR> --port=8888

If everything is set up properly, reasonable segmentation should be observed after 10 epochs.


We provide test code to generate: 1) superpixel visualization and 2) the.csv files for evaluation.

To test on BSDS500, run

python --data_dir=<DUMP_DIR> --output=<TEST_OUTPUT_DIR> --pretrained=<PATH_TO_THE_CKPT>

To test on NYUv2, please first extract our pre-processed dataset from /nyu_test_set/nyu_preprocess_tst.tar.gz to <NYU_TEST> , or follow the instruction on the superpixel benchmark to generate the test dataset, and then run

python --data_dir=<NYU_TEST> --output=<TEST_OUTPUT_DIR> --pretrained=<PATH_TO_THE_CKPT>

To test on other datasets, please first collect all the images into one folder <CUSTOM_DIR>, and then convert them into the same format (e.g. .png or .jpg) if necessary, and run

python --data_dir=<CUSTOM_DIR> --data_suffix=<IMG_SUFFIX> --output=<TEST_OUTPUT_DIR> --pretrained=<PATH_TO_THE_CKPT>

Superpixels with grid size 16 x 16 will be generated by default. To generate the superpixel with a different grid size, we simply need to resize the images into the appropriate resolution before passing them through the code. Please refer to for the details.


We use the code from superpixel benchmark for superpixel evaluation. Detailed instruction is available in the repository, please

(1) download the code and build it accordingly;

(2) edit the variables $SUPERPIXELS, IMG_PATH and GT_PATH in /eval_spixel/,

(3) run

cp /eval_spixel/ <path/to/the/benchmark>/examples/bash/
cd  <path/to/the/benchmark>/examples/

several files should be generated in the map_csv folders in the corresponding test outputs;

(4) run

cd eval_spixel

(5) open /eval_spixel/plot_benchmark_curve.m , set the our1l_res_path as <PATH_TO_COLLECT_EVAL_RES> and modify the num_list according to the test setting. The default setting is for our BSDS500 test set.;

(6) run the plot_benchmark_curve.m, the ASA Score, CO Score, and BR-BP curve of our method should be shown on the screen. If you wish to compare our method with the others, you can first run the method and organize the data as we state above, and uncomment the code in the plot_benchmark_curve.m to generate a similar figure shown in our papers.


Our code is developed based on the training framework provided by FlowNetPytorch.


[CVPR‘20] SpixelFCN: Superpixel Segmentation with Fully Convolutional Network








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