# Discovering and Reconstructing the 3D World Interactively

## Introduction

Building accurate and detailed [3D maps](https://support.microsoft.com/en-us/office/get-started-with-3d-maps-6b56a50d-3c3e-4a9e-a527-eea62a387030) is crucial for industries such as [robotics](https://www.futurelearn.com/info/courses/begin-robotics/0/steps/2844) and [augmented reality](https://www.simplilearn.com/tutorials/artificial-intelligence-tutorial/augmented-reality-apps) (AR). These maps are often used for [navigation](https://www.vaia.com/en-us/explanations/engineering/mechanical-engineering/robot-navigation/), [object manipulation](https://www.roboticautomationsystems.com/blog/what-is-a-robot-manipulator/), and creating [immersive AR experiences](https://www.digicatapult.org.uk/blogs/post/everything-to-know-about-immersive-technology/). However, one significant challenge has been the ability to reconstruct scenes in a way that identifies and isolates individual objects as manipulable entities. Traditional [3D imaging methods](https://3dqlab.stanford.edu/what-is-3d-imaging-2/) often treat the environment as a single mass, leaving much to be desired in applications requiring [object-level manipulations](https://robotics.leeds.ac.uk/research/ai-for-robotics/robotic-manipulation/). 

The scientific paper "Pickscan: Object Discovery And Reconstruction From Handheld Interactions" introduces an innovative approach that might just resolve this issue. This blog post will break down the paper's ideas and demonstrate how businesses can leverage these findings for competitive advantage.


![Image from [PickScan](https://paperreading.club/page?id=266686): Object discovery and [reconstruction](https://europe.naverlabs.com/blog/3d-reconstruction-models-made-easy/) from handheld interactions - https://arxiv.org/abs/2411.11196v1](https://i.imgur.com/2ue3BXU.png align="center")

- **Arxiv:** [https://arxiv.org/abs/2411.11196v1](https://arxiv.org/abs/2411.11196v1)
- **PDF:** [https://arxiv.org/pdf/2411.11196v1.pdf](https://arxiv.org/pdf/2411.11196v1.pdf)
- **Authors:** Krishna Murthy Jatavallabhula, Ayush Tewari, Joshua B. Tenenbaum, Marc Pollefeys, Vincent van der Brugge
- **Published:** 2024-11-17


## Main Claims and Proposals

The paper's core claim is the development of a new method, PickScan, that uses [user interactions](https://www.sciencedirect.com/topics/computer-science/human-robot-interaction) to discover and reconstruct objects in 3D without relying on [class-specific training data](https://www.cloudfactory.com/training-data-guide). This approach contrasts with traditional methods that depend heavily on [pre-trained models](https://www.analyticsvidhya.com/blog/2020/08/top-4-pre-trained-models-for-image-classification-with-python-code/) limited to certain object classes.

- **Main Proposal**: An [interaction-guided](https://ieeexplore.ieee.org/document/9859337/), [class-agnostic pipeline](https://www.amazon.science/publications/class-agnostic-object-detection) allowing users to move and interact with objects to capture their [3D model representations](https://professional3dservices.com/blog/guide-to-create-3d-models-for-augmented-reality.html).
- **Precision and Accuracy**: Achieves 78.3% [precision](https://www.analyticsvidhya.com/articles/precision-and-[recall](https://builtin.com/data-science/precision-and-recall)-in-machine-learning/) at 100% recall for identifying objects, with significantly more accurate reconstructions compared to traditional methods like [Co-Fusion](http://visual.cs.ucl.ac.uk/pubs/cofusion/icra2017_co-fusion_print.pdf).

The novelty lies in using [object movement](https://www.sciencedirect.com/science/article/abs/pii/S0143816622005000) to detect and generate objects' [3D reconstructions](https://blog.telepat.io/tag/3d-reconstructions) independent of object class, which is a significant leap forward from reliance on prior training data.

## Leveraging the Technology for Business

The potential applications of PickScan in the business realm are vast:

- **Retail and E-commerce**: Enhance customer experience by enabling accurate [virtual product display](https://www.reydar.com/virtual-product-visualisation/) and [virtual fitting rooms](https://intelistyle.com/virtual-fitting-rooms-a-complete-guide-for-retailers-and-brands/) using 3D object reconstruction without the need for pre-defined object categories.
- **Supply Chain Management**: Improve [object identification](https://www.rapidinnovation.io/post/logistics-upgraded-the-role-of-object-detection-in-effective-package-tracking-and-sorting) and tracking within warehouses for better [inventory management](https://www.unleashedsoftware.com/inventory-management-guide/inventory-management-systems/) and [automated sorting systems](https://www.datexcorp.com/automated-sortation-systems/).
- **Robotics**: Equip robots with the ability to understand and manipulate [dynamic environments](https://www.sciencedirect.com/science/article/pii/S0921889017300313) without pre-set object categories, expanding their application in unstructured or [mixed-object environments](https://www.researchgate.net/publication/221074367_Mixed_reality_simulation_for_mobile_robots).
- **Augmented Reality Applications**: Facilitate the creation of realistic AR experiences where users can interact with and manipulate virtual objects integrated into real-world settings.

By incorporating this technology, companies can reduce development time, increase flexibility across various domains, and potentially achieve substantial cost savings and increased revenue.

## How the Model is Trained

The PickScan model does not rely on extensive class-specific training, which sets it apart from other models:

- **Dataset**: Training utilizes a [custom-captured dataset](https://www.cloudfactory.com/blog/steps-to-create-custom-data-sets-for-computer-vision) with user interactions carefully recorded to capture manipulated objects in a scene.
- **Training Procedure**: Involves scanning a scene with an [RGB-D camera](https://www.e-consystems.com/blog/camera/technology/what-are-rgbd-cameras-why-rgbd-cameras-are-preferred-in-some-embedded-vision-applications/), followed by user interactions to manipulate objects which are then analyzed to identify and reconstruct objects using inferential and direct comparisons between static and [dynamic points](https://mediatum.ub.tum.de/doc/1375854/document.pdf) in the scans.

This method bypasses the conventional training paradigm that requires pre-tagged datasets, accelerating deployment times for new object types.

## Hardware Requirements

To run and train the PickScan model, the following hardware setup is suggested:

- **Camera**: Requires an RGB-D camera capable of capturing both color and [depth information](https://www.e-consystems.com/blog/camera/technology/what-are-rgbd-cameras-why-rgbd-cameras-are-preferred-in-some-embedded-vision-applications/), such as those found in modern smartphones or dedicated depth cameras.
- **Processing Power**: An [NVIDIA RTX A5000 GPU](https://arkanecloud.com/rtx-a5000-features-and-specifications/), [64GB RAM](https://www.crucial.com/articles/about-memory/how-much-ram-does-my-computer-need), and a powerful CPU such as the [Intel Core i9-10900X](https://www.ebuyer.com/blog/2024/05/which-is-the-best-intel-processor-i7-vs-i9/) are recommended given the [computational intensity](https://www.sciencedirect.com/science/article/pii/0031320390901314) of 3D reconstruction and motion analysis.
- **Performance Optimization**: Techniques like processing every nth frame during interaction phases help manage computational load without sacrificing accuracy.

This setup ensures the system can handle the intensive processes involved in [real-time 3D object detection](https://www.ultralytics.com/blog/understanding-3d-object-detection-and-its-applications) and reconstruction.

## Comparison to State-of-the-Art Alternatives

Compared to methods like Co-Fusion, PickScan introduces several advancements:

- **Precision and Reduced Noise**: Offers dramatic improvements in reducing [false positives](https://www.t2d2.ai/blog/the-confusion-matrix-false-positives-and-false-negatives-in-ai) and achieving finer, more precise [object masks](https://openaccess.thecvf.com/content/CVPR2024/papers/Wei_NTO3D_Neural_Target_Object_3D_Reconstruction_with_Segment_AnythingCVPR_2024_paper.pdf) and reconstructions.
- **Versatility Across Object Classes**: Unlike [semantic segmentation methods](https://www.superannotate.com/blog/guide-to-semantic-segmentation) that require training on specific classes, PickScan identifies objects based solely on user interaction movements, making it applicable to any rigid object.

The reliance on user-guided interactions provides richer data without the confines of categorically pre-trained data, allowing businesses to adapt to new situations dynamically.

## Conclusions and Future Directions

PickScan presents a groundbreaking approach to 3D scene reconstruction, which is versatile and does not rely on class-specific models. With its interaction-driven and class-agnostic design, the method is poised to influence a range of industries by enhancing how machines understand and interact with dynamic environments.

**Limitations and Future Improvements**:
- Improvements can focus on minimizing false positives due to noise in [hand-cloud measurements](https://www.metoffice.gov.uk/weather/guides/observations/how-we-measure-cloud) and refining [object tracking](https://encord.com/blog/object-tracking-guide/) to manage complex object shapes or textures better.
- Enhancing [camera resolution](https://reolink.com/blog/camera-resolution/?srsltid=AfmBOooh_cC6zvhJvHF7T32wMmITa7UfXTEYXxeTnAriudbx_Wa0YpVu) and [tracking algorithms](https://learnopencv.com/the-complete-guide-to-object-tracking-in-computer-vision) could further bolster the model's efficiency and application range.

By continuing to develop these areas, PickScan and similar models can revolutionize how businesses leverage [3D scanning technology](https://www.polyga.com/3d-scanning-101/3d-scanning-applications/), leading to more robust applications in [robotic automation](https://www.coursera.org/specializations/roboticprocessautomation), AR, and beyond.
    
![Image from PickScan: Object discovery and reconstruction from handheld interactions - https://arxiv.org/abs/2411.11196v1](https://i.imgur.com/lFlzLF0.png align="center")
    
%[https://github.com/vincentvanderbrugge/pickandscan]