Data Science by ODS.ai 🦜
51K subscribers
363 photos
34 videos
7 files
1.52K links
First Telegram Data Science channel. Covering all technical and popular staff about anything related to Data Science: AI, Big Data, Machine Learning, Statistics, general Math and the applications of former. To reach editors contact: @haarrp
Download Telegram
​​PIFuHD: Multi-Level Pixel-Aligned Implicit Function for High-Resolution 3D Human Digitization

Authors suggest an approach to the single image 3D shape reconstruction of a human body. The approach leverages representation from (1), that authors argue to be capable of processing high-resolution input images up to 1024 by 1024px.

The main idea of PIFu (1) is to represent a 3D shape as a function that defines the surface and the texture (both being parametrized by the MLP). This allows not to store the whole 3D volume as in voxel-based methods, but one can easily convert this representation to a mesh via a marching cube algorithm. Despite being more memory efficient, (1) still was not able to operate on the resolutions higher than 512 by 512px

Authors suggest an idea that pushes (1) even further, allowing to process images up to 1024 by 1024. They design a two-level pipeline with two PIFu modules, one for coarse shape estimation that operates on 512 by 512 px image and another one for fine-grained prediction, which takes 1024 by 1024px as an input as well as the features from the coarse level.

The model needs ground truth 3D poses thus authors use RenderPeople (2) dataset of 500 3D human models.


Paper: https://arxiv.org/pdf/2004.00452.pdf
Code: https://github.com/facebookresearch/pifuhd
Project: https://shunsukesaito.github.io/PIFuHD/
Colab: https://colab.research.google.com/drive/11z58bl3meSzo6kFqkahMa35G5jmh2Wgt

(1) Saito, S., Huang, Z., Natsume, R., Morishima, S., Kanazawa, A., & Li, H. (2019). Pifu: Pixel-aligned implicit function for high-resolution clothed human digitization. In Proceedings of the IEEE International Conference on Computer Vision (pp. 2304-2314).
(2) https://renderpeople.com/3d-people/

#3d #reconstruction #humandigitalization #singleimage