Crossings

Overview

This convenience function iterates through all crossing lines managed by a Crossings object and draws each one with its individual styling and count information using the crossing() function.

Function Signature

crossings(
    image: np.ndarray
) -> np.ndarray

Parameters

np.ndarray

required

Input BGR image to annotate. Must be a 3-channel NumPy array with shape (height, width, 3). crossings_manager: Crossings manager object containing multiple crossing lines. Must have a ‘crossings’ attribute that is iterable, containing Crossing objects.

Returns

np.ndarray

The input image with all crossing lines and count annotations drawn. Same shape and dtype as input image. Image is modified in-place.

Examples

import cv2
import pixelflow as pf

# Load image and create crossing manager
image = cv2.imread("intersection.jpg")
crossings_manager = pf.Crossings()

# Add multiple crossing lines
crossings_manager.add_crossing(

crossings_manager.add_crossing(

# Draw all crossings at once
annotated = pf.annotate.crossings(image, crossings_manager)

# Alternative workflow with tracking integration
tracker = pf.tracker.ByteTracker()
for frame in frames:

Error Handling

This function may raise the following exceptions:

AttributeError: If crossings_manager lacks ‘crossings’ attribute or if individual crossing objects lack required attributes.
AssertionError: If image is not a NumPy array (raised by underlying crossing() calls).

Notes

Each crossing line is drawn with its individual color, name, and styling
The function processes crossings in the order they appear in the manager
All crossing lines share the same adaptive sizing parameters based on image resolution
The input image is modified in-place for efficiency
This is equivalent to calling crossing() individually for each line

Getting Started

Detections

Annotators

Zones

Object Tracking

Processing Tools

Analytics

Overview

Function Signature

Parameters

Returns

Examples

Error Handling

Notes

​Overview

​Function Signature

​Parameters

​Returns

​Examples

​Error Handling

​Notes

Overview

Function Signature

Parameters

Returns

Examples

Error Handling

Notes