# BiSVP: Building Footprint Extraction via Bidirectional Serialized Vertex Prediction

## TL;DR

BiSVP introduces a simple, end-to-end method for extracting building footprints from remote sensing images by predicting ordered vertices directly, eliminating complex refinement stages and achieving superior performance.

## Contribution

The paper proposes BiSVP, a refinement-free, bidirectional serialized vertex prediction approach with cross-scale feature fusion for building footprint extraction.

## Key findings

- Outperforms state-of-the-art methods on three benchmarks
- Effective high-resolution and semantic feature learning
- Simplifies building footprint extraction process

## Abstract

Extracting building footprints from remote sensing images has been attracting extensive attention recently. Dominant approaches address this challenging problem by generating vectorized building masks with cumbersome refinement stages, which limits the application of such methods. In this paper, we introduce a new refinement-free and end-to-end building footprint extraction method, which is conceptually intuitive, simple, and effective. Our method, termed as BiSVP, represents a building instance with ordered vertices and formulates the building footprint extraction as predicting the serialized vertices directly in a bidirectional fashion. Moreover, we propose a cross-scale feature fusion (CSFF) module to facilitate high resolution and rich semantic feature learning, which is essential for the dense building vertex prediction task. Without bells and whistles, our BiSVP outperforms state-of-the-art methods by considerable margins on three building instance segmentation benchmarks, clearly demonstrating its superiority. The code and datasets will be made public available.