Computer Vision Design Patterns

Installation

To install the package, you can use either pip:

pip install computer-vision-design-patterns

or poetry:

poetry add computer-vision-design-patterns

You can also install the package from the source code by cloning the repository and running:

poetry install

Features

Events

TimeEvent

TimeEvent activates immediately when triggered and automatically deactivates after a specified duration.

from computer_vision_design_patterns.event import TimeEvent
import time

# Create an event that stays active for 2 seconds
event = TimeEvent(2)

# Trigger the event
event.trigger()
print(event.is_active())  # True

# After 2 seconds
time.sleep(2)
print(event.is_active())  # False

# Retriggering resets the timer
event.trigger()
print(event.is_active())  # True again

CountdownEvent

CountdownEvent starts inactive, counts down for a specified duration, and then activates.

from computer_vision_design_patterns.event import CountdownEvent
import time

# Create a countdown event for 3 seconds
event = CountdownEvent(3)

# Start the countdown
event.trigger()
print(event.is_active())  # False (still counting down)

# After 3 seconds
time.sleep(3)
print(event.is_active())  # True (countdown completed)

# Reset the event
event.reset()
print(event.is_active())  # False

Key Differences

1. TimeEvent:

   • Activates immediately upon trigger and can be triggered multiple times
   • Automatically deactivates after the duration has elapsed
   • Can be reset by triggering again

2. CountdownEvent:

   • Starts inactive
   • Can be triggered multiple times
   • Activates only after countdown completes
   • Stays active until manually reset

Examples

Check the dev folder for comprehensive examples of both event types.

Counters

ManualCounter

ManualCounter is a simple counter that activates when it reaches a specified threshold value. It requires manual updates and can be reset to start counting again.

from computer_vision_design_patterns.counter import ManualCounter
import time

# Create a counter that activates after 3 counts
counter = ManualCounter(3)

# Update the counter
counter.update()
print(counter.is_active())  # False (count = 1)

counter.update()
print(counter.is_active())  # False (count = 2)

counter.update()
print(counter.is_active())  # True (count = 3)

# Reset the counter
counter.reset()
print(counter.is_active())  # False (count = 0)

Examples

Check the dev/ folder for comprehensive examples of counter usage.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.