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NeuSurfEmb: A Complete Pipeline for Dense Correspondence-based 6D Object Pose Estimation without CAD Models

Francesco Milano, Jen Jen Chung, Hermann Blum, Roland Siegwart, Lionel Ott

IROS 2024

Paper

NeuSurfEmb

State-of-the-art approaches for 6D object pose estimation assume the availability of CAD models and require the user to manually set up physically-based rendering (PBR) pipelines for synthetic training data generation. Both factors limit the application of these methods in real-world scenarios. In this work, we present a pipeline that does not require CAD models and allows training a state-of-the-art pose estimator requiring only a small set of real images as input. Our method is based on a NeuS2 object representation, that we learn through a semi-automated procedure based on Structure-from-Motion (SfM) and object-agnostic segmentation. We exploit the novel-view synthesis ability of NeuS2 and simple cut-and-paste augmentation to automatically generate photorealistic object renderings, which we use to train the correspondence-based SurfEmb pose estimator. We evaluate our method on the LINEMOD-Occlusion dataset, extensively studying the impact of its individual components and showing competitive performance with respect to approaches based on CAD models and PBR data. We additionally demonstrate the ease of use and effectiveness of our pipeline on self-collected real-world objects, showing that our method outperforms state-of-the-art CAD-model-free approaches, with better accuracy and robustness to mild occlusions.

Table of contents

  1. Installation
  2. Training
  3. Evaluation on BOP
  4. Evaluation on real-world datasets
  5. Citation
  6. Acknowledgements

Installation

Please refer to this page for the installation steps.

Training

In the following, we assume that a virtualenv was created in the folder ${NEUSURFEMB_VIRTUALENV} according to the installation instructions above, and that the virtualenv was sourced (i.e., the command source ${NEUSURFEMB_VIRTUALENV}/bin/activate was run).

The instructions below will show how to use NeuS2 to build a neural implicit object model and generate a dataset (yellow boxes in the teaser figure), train the SurfEmb pose estimator using the generated data (green boxes in the teaser figure), and run pose estimation using the trained model (purple box in the teaser figure). Follow all the steps to use the pipeline for a new, real-world object; to instead train a model for objects in the LINEMOD dataset, skip the "Data recording and extraction", "Structure from Motion", and "Semi-automatic mask extraction" steps (since camera poses and object masks are available in BOP datasets).

Cf. the Section Example pipeline training for an example run of the pipeline in a single script, using example data provided for download.

Data recording and extraction [skip for BOP datasets]

It is expected that for a new, real-world object, around 100 images of the object of interest are available. The images should be of high quality (e.g., high resolution and no motion blur) and be captured from viewpoints distributed roughly uniformly around the object, so as to cover all sides of the object except for its bottom part. The object should always be visible and not occluded in the frames, and we strongly recommend including some high-texture elements (for instance, a carpet with non-symmetrical patterns) around or below the object of interest; this is important to improve the convergence of the SfM module, especially for symmetrical and low-texture objects.

The frames can be extracted from a video recorded with a smartphone, similarly to what we did in our real-world experiments. We suggest moving the smartphone slowly to avoid motion blur. The SfM module (cf. next Section) can either process raw, uncalibrated images, or take as input undistorted images from an already calibrated camera. Depending on which option you choose, you may either:

  • Manually create a dataset folder ${DATASET_FOLDER} and extract approximately 100 frames into a ${DATASET_FOLDER}/raw_rgb subfolder, in case you would like to use the SfM module with uncalibrated images, or
  • (Recommended) Follow these instructions to calibrate the camera and extract the undistorted frames, in case you would like to use the SfM module with undistorted images as input.

Since SfM motion is inherently scale ambiguous, the reconstructed NeuS2 model (and consequently the estimated poses) will be in an arbitrary scale when using only RGB images as input. To retrieve the scene scale in meters and use it to reconstruct the NeuS2 model and estimate poses in meters, you may optionally provide an additional ${DATASET_FOLDER}/raw_depth subfolder containing depth images aligned to the RGB frames. If these are available, the SfM module will automatically convert the scene scale to meters using the depth frames.

Structure from Motion [skip for BOP datasets]

Given the dataset folder described, Structure-from-Motion based on COLMAP and hloc, is used to retrieve camera poses to later train a NeuS2 object model.

SfM using camera calibration and pre-undistorted images (recommended)

Assuming that you have previously run camera calibration and undistorted the input frames (cf. above), run the pose_labeling_given_intrinsics.py script:

python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/pose_labeling_given_intrinsics.py ${DATASET_FOLDER};
Docker version: 
${NEUSURFEMB_ROOT}/docker/run_docker.sh -d ${SHARED_HOST_FOLDER} python /home/src/neusurfemb/neusurfemb/dataset_scripts/pose_labeling_given_intrinsics.py ${DATASET_FOLDER};
SfM from raw images

Use the pose_labeling.py script:

python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/pose_labeling.py ${DATASET_FOLDER};
Docker version: 
${NEUSURFEMB_ROOT}/docker/run_docker.sh -d ${SHARED_HOST_FOLDER} python /home/src/neusurfemb/neusurfemb/dataset_scripts/pose_labeling.py ${DATASET_FOLDER};

Semi-automatic mask extraction [skip for BOP datasets]

We use a SAM-based solution to extract the object masks from the dataset:

python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_bbox.py --dataset-folder ${DATASET_FOLDER}
Docker version 
${NEUSURFEMB_ROOT}/docker/run_docker.sh -d ${SHARED_HOST_FOLDER} -- python /home/src/neusurfemb/neusurfemb/dataset_scripts/extract_object_masks_bbox.py --dataset-folder ${DATASET_FOLDER}

The script will prompt the user to select a bounding box around the object in the first image. It can also be used without GUI interaction by providing the argument --bbox-prompt, indicating the coordinates of the bounding box around the object in the first image in the x_min y_min x_max y_max format (e.g., --bbox-prompt 100 200 600 500).

We recommend checking the output masks extracted for each frame (which are stored as alpha channel of the images in ${DATASET_FOLDER}/rgb), as for complex objects a single bounding-box prompt might not be sufficient for accurate segmentation via SAM, or the tracker performance might be occasionally suboptimal. We provide a set of scripts to perform more fine-grained mask extraction, if needed:

  • To re-extract masks from a specific frame using a single bounding box prompt, use the script extract_object_masks_single_frames_bbox.py 
    python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_single_frames_bbox.py --image-path ${IMAGE_PATH};

    where ${IMAGE_PATH} is the path of the image of which to recompute the mask.

    Example: python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_single_frames_bbox.py --image-path ${DATASET_FOLDER}/rgb/000000.png.

  • To re-extract masks from a specific frame using one or multiple point prompts, use the script extract_object_masks_single_frames.py 
    python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_single_frames.py --image-path ${IMAGE_PATH};

    where ${IMAGE_PATH} is the path of the image of which to recompute the mask.

    Example: python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_single_frames.py --image-path ${DATASET_FOLDER}/rgb/000000.png.

  • To extract masks with manual bounding box prompts (one or multiple) for all the frames in a folder (i.e., without using the tracker), use the script extract_object_masks_bbox_continuous_prompt.py 
    python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_bbox_continuous_prompt.py --dataset-folder ${DATASET_FOLDER};

    where ${DATASET_FOLDER} is the path of the dataset folder, which should contain an rgb subfolder with mask-free images (i.e., as it was before mask extraction). To optionally have multiple bounding box prompts per image, use the --num-bboxes-per-image flag.

    Example: python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/extract_object_masks_bbox_continuous_prompt.py --dataset-folder ${DATASET_FOLDER} --num-bboxes-per-image 2.

NeuS2 training and data generation

Format the data for NeuS training

Own, real-world objects

For a real, self-captured object dataset (see above), use the script real_dataset_to_neus.py to prepare the data for NeuS2 training:

python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/real_dataset_to_neus.py --dataset-folder ${DATASET_FOLDER};
Docker version 
${NEUSURFEMB_ROOT}/docker/run_docker.sh -d ${SHARED_HOST_FOLDER} -- python /home/src/neusurfemb/neusurfemb/dataset_scripts/real_dataset_to_neus.py --dataset-folder ${DATASET_FOLDER};
BOP datasets

For an existing BOP dataset, follow the instructions below.

To begin with, download the BOP data in a folder ${BOP_FOLDER} of your choice. In the following, we show the instructions for LINEMOD:

cd ${BOP_FOLDER};
# Download the base archive and the object models (only used for evaluation).
wget https://bop.felk.cvut.cz/media/data/bop_datasets/lm_base.zip;
unzip -q lm_base.zip && rm lm_base.zip;
cd ${BOP_FOLDER}/lm;
wget https://bop.felk.cvut.cz/media/data/bop_datasets/lm_models.zip;
unzip -q lm_models.zip && rm lm_models.zip;
# Download the images. For LINEMOD, we use the BOP'19-23 test images to form the
# models. We then assume that evaluation is performed on LINEMOD-Occlusion
# instead.
cd ${BOP_FOLDER}/lm;
wget https://bop.felk.cvut.cz/media/data/bop_datasets/lm_test_bop19.zip;
unzip -q lm_test_bop19.zip && rm lm_test_bop19.zip;

Use the script bop_dataset_to_neus.py to format the data for NeuS training:

# Example for scene 1.
python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/bop_dataset_to_neus.py --scene-path ${BOP_SCENE_FOLDER}/lm/test/000001 --obj-id-to-process 1

[Optional] Normalize object to a specific scale

To allow the quality of the NeuS-based object reconstruction to be less dependent on the object size (avoiding, e.g., that smaller objects get reconstructed with a lower level of detail), we recommend normalizing the size of each object to a fixed extent of the full 3D bound used by NeuS. To do so, we run a two-step training process. In particular, before the actual training, we train NeuS with the transform file formed as detailed above. We then extract a point cloud from the reconstruction, compute the object size from the point cloud, and use this to normalize the poses, so that a subsequent NeuS training yields an object size approximately equal to the desired one, which is defined by the parameter ${BOUND_EXTENT} (between 0 and 1). We find BOUND_EXTENT=0.55 to achieve the best trade off between reconstruction quality (evaluated on LINEMOD as average Chamfer distance w.r.t. the ground-truth models) and reconstruction density.

You may use the adapt_dataset_scale.py script to perform this conversion. A new version of the dataset will be created in a new_dataset subfolder (cf. below):

BOUND_EXTENT=0.55;
python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/adapt_dataset_scale.py --scene-transform-path ${DATASET_FOLDER}/transforms.json --name bound_${BOUND_EXTENT} --n-steps 4000 --should-convert-to-mm --bound-extent ${BOUND_EXTENT};
export DATASET_FOLDER=${DATASET_FOLDER}/neus_rescaling/bound_${BOUND_EXTENT}/new_dataset;
Docker version 
BOUND_EXTENT=0.55;
${NEUSURFEMB_ROOT}/docker/run_docker.sh -d ${SHARED_HOST_FOLDER} -- python /home/src/neusurfemb/neusurfemb/dataset_scripts/adapt_dataset_scale.py --scene-transform-path ${DATASET_FOLDER}/transforms.json --name bound_${BOUND_EXTENT} --n-steps 4000 --should-convert-to-mm --bound-extent ${BOUND_EXTENT};
export DATASET_FOLDER=${DATASET_FOLDER}/neus_rescaling/bound_${BOUND_EXTENT}/new_dataset;

NeuS2 training

To train NeuS2 and generate data, run the following script:

python ${NEUSURFEMB_ROOT}/training_scripts/train_neus.py ${DATASET_FOLDER} --workspace ${EXPERIMENT_FOLDER} --num-iters ${NUM_TRAIN_ITERS} --compute-oriented-bounding-box ${COMPUTE_ORIENTED_BBOX}

where ${EXPERIMENT_FOLDER} is the path to the output folder that will contain the trained model as well as the generated data, ${NUM_TRAIN_ITERS} is the number of NeuS2 training iterations (we find 6000 to usually yield a good reconstruction and 20000 to improve results for more complex objects), ${COMPUTE_ORIENTED_BBOX} should be true if the object coordinate system should be adjusted to be aligned with an oriented bounding box and false otherwise. This alignment is used to define camera poses when generating data, to avoid for instance that camera poses that look at the object from the bottom are used. We recommend setting it to true for real objects labelled with dataset_scripts/pose_labeling.py and to false for BOP datasets, the latter because the coordinate system of these datasets is already properly aligned.

The training data can be cropped and resized to a fixed size and coordinates can be generated for each frame. This enables using these data also for training the pose estimation pipeline. To do so, also specify the flags --crop-res-train-dataset and --crop-scale-factor-train-dataset with associated values when running the above script. The two flags represent respectively the resolution of the rendered crop and the factor by which the object-tight bounding boxes used to crop the images are enlarged. For instance, for resolution of 224x224 based on a crop that is tight to the object boundaries, use the flags --crop-res-train-dataset 224 --crop-scale-factor-train-dataset 1.0.

To generate synthetic data, also specify the flag --synthetic-data-config-path followed by a path to a valid config file when running the above script (e.g., --synthetic-data-config-path ${NEUSURFEMB_ROOT}/cfg/syn_data_generation/config_10000_views.yml).

Docker version (example with synthetic data generation) 
EXPERIMENT_FOLDER=${DATASET_FOLDER}/training;
NUM_TRAIN_ITERS=20000;
COMPUTE_ORIENTED_BBOX=true;
${NEUSURFEMB_ROOT}/docker/run_docker.sh -d ${SHARED_HOST_FOLDER} -- python /home/src/neusurfemb/training_scripts/train_neus.py ${DATASET_FOLDER} --workspace ${EXPERIMENT_FOLDER} --num-iters ${NUM_TRAIN_ITERS} --compute-oriented-bounding-box ${COMPUTE_ORIENTED_BBOX} --synthetic-data-config-path /home/src/neusurfemb/cfg/syn_data_generation/config_10000_views.yml;

SurfEmb training

We implement different configurations for training SurfEmb, depending on the renderer, object model and data used:

Coordinate renderer Object model Data Comments
1. Neus2 Point cloud from mesh generated using NeuS2 Data generated using NeuS2 -
2. ModernGL renderer Point cloud from mesh generated using NeuS2 Data generated using NeuS2 -
3. ModernGL renderer Point cloud from CAD model Data generated using NeuS2 Only available for (BOP) datasets
4. ModernGL renderer Point cloud from CAD model PBR data Only available for (BOP) datasets, original SurfEmb setup
5. ModernGL renderer Point cloud from mesh generated using NeuS2 PBR data Only available for (BOP) datasets

Before starting SurfEmb training, create a symbolic link to the data produced by NeuS2:

mkdir -p ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop;
cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
export EXPERIMENT_BASE_NAME=$(basename ${EXPERIMENT_FOLDER});
ln -s ${EXPERIMENT_FOLDER}/data_for_surfemb/ data/bop/${EXPERIMENT_BASE_NAME};
ln -s ${EXPERIMENT_FOLDER}/data_for_surfemb/surface_samples/ data/surface_samples/${EXPERIMENT_BASE_NAME};
ln -s ${EXPERIMENT_FOLDER}/data_for_surfemb/surface_samples_normals/ data/surface_samples_normals/${EXPERIMENT_BASE_NAME};

Optionally, disable WandB logging before starting training: export WANDB_MODE=disabled.

Then proceed with one of the Options 1-5 below. Note that for new, real-world objects, only Options 1-2 are viable. Important: For a correct folder setup when using the Docker installation, cf. Step 8 in the example script example_pipeline_run.sh.

  • Additional pre-requisites for training on BOP datasets

    Set up the paths correctly and download the inference data from SurfEmb, also later required for evaluation:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop;
# Assuming in the instructions above the LINEMOD dataset was downloaded.
ln -s ${BOP_SCENE_FOLDER}/lm lm;
# Download the inference data.
# - Create a temporary folder if non-existent.
if [ -z ${TMPDIR+x} ]; then
    export TMPDIR=$(mktemp -d);
fi;
# - Download the data.
pushd $TMPDIR;
wget https://github.com/rasmushaugaard/surfemb/releases/download/v0.0.1/inference_data.zip;
unzip -q inference_data.zip && rm inference_data.zip;
mv data/detection_results $NEUSURFEMB_ROOT/third_party/surfemb/data/;
mv data/surface_samples/* $NEUSURFEMB_ROOT/third_party/surfemb/data/surface_samples/;
mv data/surface_samples_normals/* $NEUSURFEMB_ROOT/third_party/surfemb/data/surface_samples_normals/;
popd;
  • Option 1: Use NeuS2 renderer with object model generated using Neus2 and data generated using NeuS2

    Run SurfEmb training, specifying the flags --neus2-dataset and --renderer-type neus2_offline:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python -m surfemb.scripts.train ${EXPERIMENT_BASE_NAME} --gpus 0 --neus2-dataset --renderer-type neus2_offline;

    This type of training will read pre-computed coordinate maps, properly adjusting them to account for data augmentation, but will not render new coordinate maps online.

    To render new coordinate maps online (slower and effectively equivalent to offline at the moment because no new poses are used), use instead the flag --renderer-type neus2_online, along with the --neus2-checkpoint-folders flag indicating the path to the pre-trained NeuS2 model:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python -m surfemb.scripts.train ${EXPERIMENT_BASE_NAME} --gpus 0 --neus2-dataset --renderer-type neus2_online --neus2-checkpoint-folders ${EXPERIMENT_FOLDER}/checkpoints;
  • Option 2: Use ModernGL renderer with object model generated using Neus2 and data generated using NeuS2

    Run SurfEmb training, specifying the flags --neus2-dataset and --renderer-type moderngl:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python -m surfemb.scripts.train ${EXPERIMENT_BASE_NAME} --gpus 0 --neus2-dataset --renderer-type moderngl;

    Include the flag --real if the real, converted training-image dataset should be used instead of the synthetically generated images (for debug or testing only).

  • Option 3: Use ModernGL renderer with object CAD model and data generated using NeuS2 [(BOP) datasets only]

    Use the same commands as Option 2, but replace the folders models, surface_samples, and surface_samples_normals in ${EXPERIMENT_FOLDER}/data_for_surfemb with the corresponding ones in the BOP dataset folder (e.g., ${BOP_FOLDER}/lm, if using LINEMOD as described above). Important: Only the object models for the object of interest should be used when replacing, otherwise the instantiated network will contain a decoder for each object found! In practice, to train for instance on object 000001, the folder ${EXPERIMENT_FOLDER}/data_for_surfemb/models should only contain only a models_info.json and an obj_000001.ply file, and the folders ${EXPERIMENT_FOLDER}/data_for_surfemb/surface_samples and {EXPERIMENT_FOLDER}/data_for_surfemb/surface_samples_normals and should contain only a obj_000001.ply file.

  • Option 4: Use ModernGL renderer with object CAD model and PBR data [(BOP) datasets only]

    Simply use regular SurfEmb training. For instance to train on LINEMOD, downloaded as described above, run:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
# Download the PBR data and extract it.
pushd data/bop/lm;
wget https://bop.felk.cvut.cz/media/data/bop_datasets/lm_train_pbr.zip;
unzip -q lm_train_pbr.zip && rm lm_train_pbr.zip;
popd;
python -m surfemb.scripts.train lm --gpus 0 --renderer-type moderngl;
  • Option 5: Use ModernGL renderer with object model generated using Neus2 and PBR data [(BOP) datasets only]

    Use the same command as Option 4 to download the data if you have not done so already (or create a symlink to the folder containing it), but replace the folder models in lm with the NeuS2 models folder previously generated for your object of interest. Example:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop;
export DATASET_NAME_NEUS2_MODELS_PBR_DATA=${EXPERIMENT_BASE_NAME}_pbr_data;
mkdir ${DATASET_NAME_NEUS2_MODELS_PBR_DATA};
cd ${DATASET_NAME_NEUS2_MODELS_PBR_DATA};
ln -s ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop/lm/train_pbr train_pbr;
ln -s ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop/${EXPERIMENT_BASE_NAME}/models models;

    You can then use the following command for training:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python -m surfemb.scripts.train ${DATASET_NAME_NEUS2_MODELS_PBR_DATA} --gpus 0 --renderer-type moderngl;
  • Training on multiple objects concurrently

    To train a model on multiple objects concurrently, you may use the script neusurfemb/dataset_scripts/generate_merged_dataset.py to generate a merged dataset containing symlinks to the different objects. As an example, to generate a merged dataset with two objects that were reconstructed in experiment folders ${EXPERIMENT_FOLDER_OBJ_1} and ${EXPERIMENT_FOLDER_OBJ_2} respectively, you can run:

    python ${NEUSURFEMB_ROOT}/neusurfemb/dataset_scripts/generate_merged_dataset.py --datasets-to-merge ${EXPERIMENT_FOLDER_OBJ_1}/data_for_surfemb ${EXPERIMENT_FOLDER_OBJ_2}/data_for_surfemb --path-output-dataset ${OUTPUT_MERGED_DATASET_PATH}

    where ${OUTPUT_MERGED_DATASET_PATH} is the path where the merged dataset should be saved. NOTE: It is assumed that the objects to merge in a single dataset have different object IDs.

    Once generated the merged dataset, training can be run using the same commands as above, after creating a symlink to the merged dataset:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
export MERGED_DATASET_NAME=$(basename ${OUTPUT_MERGED_DATASET_PATH});
ln -s ${OUTPUT_MERGED_DATASET_PATH} data/bop/${MERGED_DATASET_NAME};
ln -s ${OUTPUT_MERGED_DATASET_PATH}/surface_samples/ data/surface_samples/${MERGED_DATASET_NAME};
ln -s ${OUTPUT_MERGED_DATASET_PATH}/surface_samples_normals/ data/surface_samples_normals/${MERGED_DATASET_NAME};

    In particular, note that to use Option 5, you need to create a symlink to all the object models, like follows

    ln -s ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop/${MERGED_DATASET_NAME}/models models;

    instead of

    ln -s ${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop/${EXPERIMENT_BASE_NAME}/models models;

[Optional] YOLOv8 training

Train a YOLOv8 model using the train_yolo.py script:

python ${NEUSURFEMB_ROOT}/training_scripts/train_yolo.py --dataset-folder ${DATASET_FOLDER} --object-name ${OBJECT_NAME}

where ${OBJECT_NAME} is the name of the object (e.g., "box"). At the end of the training, the resulting model file can be found at ${DATASET_FOLDER}/yolo/training/weights/best.pt.

Example pipeline training

To test all the above steps and run the pipeline, we provide an example video recording for calibration (calib_video.mp4), an associated object video (helmet_alone_1.mp4), and an example evaluation scene (helmet_alone_1_eval.zip) which you may download by clicking on the links. Store the three files in a folder ${EXAMPLE_DATA_FOLDER} of your choice. Then, assuming you have performed a Docker-based installation, run the script example_pipeline_run.sh to perform all the steps, from camera calibration to SurfEmb training and inference on the evaluation dataset:

bash ${NEUSURFEMB_ROOT}/example_pipeline_run.sh ${NEUSURFEMB_ROOT} ${EXAMPLE_DATA_FOLDER} calib_video.mp4 helmet_alone_1.mp4 helmet_alone_1_eval.zip ${RENDERER_POSE_ESTIMATION_EVALUATION}

where ${RENDERER_POSE_ESTIMATION_EVALUATION} denotes the type of renderer to use for pose estimation on the evaluation dataset (either moderngl or neus2).

While the script above is fully automated (only prompting the user for a bounding box input), we recommend manually inspecting the results of each step when first running the pipeline on a new object of your choice.

Evaluation on BOP

Follow the instructions below to evaluate a model trained on an object from a BOP dataset.

  • Estimate poses

    Run the following script to estimate poses:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python -m surfemb.scripts.infer ${CKPT_PATH} --use-normals-criterion true --dataset ${DATASET} --surface-samples-dataset ${SURFACE_SAMPLES_DATASET} --renderer-type ${RENDERER_TYPE} --device cuda:0;

    where

    • ${CKPT_PATH} is the path to the checkpoint to evaluate;
    • ${DATASET} is the BOP dataset on which to evaluate (e.g., lmo) and for which it is assumed that data was already downloaded (cf. NeuS2 training and data generation -> Format the data for NeuS training -> BOP datasets) and a symbolic link was already created (cf. SurfEmb training);
    • ${SURFACE_SAMPLES_DATASET} is the same as ${DATASET} if pose estimation should use the surface samples and normals from the original BOP CAD model or the name of the (merged) NeuS2 dataset created above if pose estimation should use the surface samples and normals from the mesh generated with NeuS2;
    • ${RENDERER_TYPE} can be moderngl or neus2_online (cf. above).
      • If using neus2_online as ${RENDERER_TYPE}, the flag --neus2-checkpoint-folders is also required, followed by the path to the output folder of the NeuS2 model (e.g., ${EXPERIMENT_FOLDER}/checkpoints, cf. Option 1 for SurfEmb training above).

    NOTE: To evaluate on the full dataset, in case of models trained on single objects, the command above should be run for each object in the dataset (i.e., for each ${CKPT_PATH}).

  • Compute pose estimation metrics

    Convert the generated results to a .csv format readable by bop_toolkit:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python -m surfemb.scripts.misc.format_results_for_eval ${DATASET} data/results/$(basename ${CKPT_PATH} .ckpt)-poses.npy;

    If using models trained on single objects, to produce results for the entire dataset, the results produced above for each per-object model should be merged into a single .csv file. To do so, you may run the following script:

    cd ${NEUSURFEMB_ROOT}/third_party/surfemb;
python surfemb/scripts/misc/merge_csv_files.py --csv-paths ${CSV_PATHS} --output-filename data/results/${OUTPUT_CSV_FILE_NAME};

    where ${CSV_PATHS} is a list or expandable expression of paths to the .csv files to merge (e.g., data/results/linemod_*.csv) and ${OUTPUT_CSV_FILE_NAME} is the desired filename of the merged output .csv file.

    Then, compute the pose estimation metrics using bop_toolkit:

    cd ${NEUSURFEMB_ROOT}/third_party/bop_toolkit;
export BOP_PATH=${NEUSURFEMB_ROOT}/third_party/surfemb/data/bop;
python scripts/eval_bop19_pose.py --renderer_type=vispy --eval_path ${NEUSURFEMB_ROOT}/third_party/surfemb/data/results --results_path ${NEUSURFEMB_ROOT}/third_party/surfemb/data/results --result_filenames ${OUTPUT_CSV_FILE_NAME};

Evaluation on real-world datasets

We provide the example script test_pose_estimator.py for evaluating a trained model on real-world datasets.

The script may be used with either externally-provided boxes, using the flag --bbox-folder, or with a pre-trained YOLO checkpoint, using the flag --yolo-checkpoint-path:

# Example with externally-provided bounding boxes. The bounding boxes are assumed to be provided in the format `x_min y_min x_max y_max` in `.txt` files with the same filename as the corresponding image in the image folder (e.g., `000000.txt` corresponding to `000000.png`).
python ${NEUSURFEMB_ROOT}/test_pose_estimator.py --image-folder ${EVALUATION_DATASET_FOLDER}/rgb/ --pose-estimation-cfg-file ${POSE_EST_CFG_FILE} --bbox-folder ${EVALUATION_DATASET_FOLDER}/bbox/;
# Example with pre-trained a YOLO checkpoint.
python ${NEUSURFEMB_ROOT}/test_pose_estimator.py --image-folder ${EVALUATION_DATASET_FOLDER}/rgb/ --pose-estimation-cfg-file ${POSE_EST_CFG_FILE} --yolo-checkpoint-path ${DATASET_FOLDER}/yolo/training/weights/best.pt;

where ${EVALUATION_DATASET_FOLDER} is the path to the evaluation dataset and ${POSE_EST_CFG_FILE} is a configuration file containing the parameters to use for pose estimation and the intrinsics of the evaluation dataset. Cf. the example configuration files provided in cfg/evaluation.

Also cf. Step 10 in the example_pipeline_run.sh script for an example on how to perform evaluation using the Docker-based installation.

Citation

If you find our code or paper useful, please cite:

@inproceedings{Milano2024NeuSurfEmb,
  author    = {Milano, Francesco and Chung, Jen Jen and Blum, Hermann and Siegwart, Roland and Ott, Lionel},
  title     = {NeuSurfEmb: A Complete Pipeline for Dense Correspondence-based 6D Object Pose Estimation without CAD Models},
  booktitle = {IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)},
  year      = {2024}
}

Acknowledgements

Based on NeuS2, SurfEmb, Segment Anything (SAM), mmtracking, and hloc. Parts of the code are also based on torch-ngp, autolabel, and video2bag.

This work has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 101017008 (Harmony).

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