Overview

• Introduction
• Object Classes
  • Zebra-Cross

Introduction

The dataset aims to identify and annotate zebra crossings from aerial imagery for urban planning and traffic analysis. It contains a single class: zebra-cross, which represents pedestrian crosswalks marked by a series of parallel white stripes on the road.

Object Classes

Zebra-Cross

Description

Zebra crossings are pedestrian crosswalks typically marked by a series of distinctive parallel white stripes on the road surface. They often appear as rectangular blocks aligned perpendicular to the direction of traffic.

Instructions

• Annotate each zebra crossing visible in the image, ensuring to include all parallel stripes.
• The bounding box should tightly cover the entire crosswalk area, encompassing all visible white stripes regardless of road orientation.
• If the zebra crossing is partially obscured or extends beyond the image, only annotate the visible parts.
• Ensure no overlapping boxes for multiple crossings; each distinct crosswalk should be individually annotated.
• Do not annotate other road markings or similar patterns that do not align with the identified visual characteristics of zebra crossings.

Overview

• Introduction
• Object Classes
  • Zebra Cross

Introduction

The dataset is designed for object detection focusing on "zebra-cross" markings visible in overhead or aerial imagery. The dataset contains annotations identifying zebra crossings, which are road surface markings consisting of alternating dark and light stripes intended to guide pedestrian crossing.

Object Classes

Zebra Cross

Description

Zebra crossings are pedestrian crossings visible as stripes on the road. The markings are characterized by distinct alternating bands that stretch perpendicularly across the road, often found near intersections or pedestrian pathways.

Instructions

• Identify the Pattern: Locate the series of alternating stripes that form a zebra cross pattern on road surfaces. The stripes should be oriented perpendicularly to the road's direction.
• Bounding Box Guidelines:
  • Include All Stripes: Ensure the bounding box encompasses the entire set of visible stripes within the crossing.
  • Edge Visibility: If the crossing is partially cut off by the image border, extend the box only until the visible boundary.
  • Overlapping Vehicles: Ignore partial obstructions such as vehicles; still, draw the box over the observable area.
• Exclusion Criteria:
  • Non-Distinct Markings: Do not annotate worn or indistinct markings that do not clearly display the typical zebra pattern.
  • Non-Perpendicular Lines: Exclude lines or markings that do not maintain the perpendicular orientation typical of zebra crossings.

Ensure each annotated zebra cross is clear, visible, and distinct in the aerial view provided.