nano-wait-vision 0.3.0

Vision extension for nano-wait automation

Nano-Wait-Vision — Visual Execution Extension

nano-wait-vision is the official computer vision extension for nano-wait. It integrates visual awareness (OCR, icon detection, screen states) into the adaptive waiting engine, enabling deterministic, screen-driven automations.

[!IMPORTANT] Critical Dependency: This package DEPENDS on nano-wait. It does not replace nano-wait — it extends it.

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🧠 What is Nano-Wait-Vision?

Nano-Wait-Vision is a deterministic vision engine for Python automation. Instead of waiting blindly with sleep(), it allows your code to wait for real visual conditions:

• Text appearing on screen
• Icons becoming visible
• UI states changing

It is designed to work in strict cooperation with nano-wait:

Component	Responsibility
⏱️ nano-wait	When to check (adaptive pacing & CPU-aware waiting)
👁️ nano-wait-vision	What to check (screen, OCR, icons)

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🧩 Key Features

nano-wait-vision extends nano-wait with:

• 👁️ OCR (Optical Character Recognition): Read real text directly from the screen.
• 🖼️ Icon Detection: Template matching via OpenCV.
• 🧠 Explicit Visual States: Each operation returns a structured VisionState.
• 📚 Persistent & Explainable Diagnostics: No black-box ML models.
• 🖥️ Screen-Based Automation: Ideal for RPA and GUI testing.
• ⚡ Selenium / Pytest Adapters: Immediate adoption in corporate or academic QA workflows.

[!TIP] All waiting logic is delegated to nano-wait.wait() — never time.sleep().

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🚀 Quick Start

Installation

pip install nano-wait
pip install nano-wait-vision

Simple Visual Observation

from nano_wait_vision import VisionMode

vision = VisionMode()
state = vision.observe()

print(f"Detected: {state.detected}")
print(f"Text: {state.text}")

Wait for Text to Appear

from nano_wait_vision import VisionMode

vision = VisionMode(verbose=True)

# Wait up to 10 seconds for the word "Welcome"
state = vision.wait_text("Welcome", timeout=10)

if state.detected:
    print("Text detected!")

Wait for an Icon

from nano_wait_vision import VisionMode

vision = VisionMode()

# Wait up to 10 seconds for an icon image
state = vision.wait_icon("ok.png", timeout=10)

if state.detected:
    print("Icon found on screen.")

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⚠️ Installation & Dependencies

This library interacts directly with your operating system screen and OCR engine.

Python Dependencies (auto-installed)

• opencv-python
• pytesseract
• pyautogui
• numpy

🧠 Mandatory External Dependency — Tesseract OCR

OCR will not work unless Tesseract is installed and available in your PATH.

OS	Command / Action
macOS	brew install tesseract
Ubuntu / Debian	sudo apt install tesseract-ocr
Windows	Download from the official Tesseract repo and add to PATH

[!WARNING] If Tesseract is missing, OCR calls will silently fail or return empty text.

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🧠 Mental Model — How It Works

Nano-Wait-Vision follows this loop: observe → evaluate → wait → observe.

Two engines cooperate:

👁️ Vision Engine	⏱️ nano-wait
OCR / Icons	Adaptive timing
Screen capture	CPU-aware waits
Visual states	Smart pacing

Vision never sleeps. All delays are handled by nano-wait.

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📦 VisionState — Return Object

Every visual operation returns a VisionState object:

VisionState(
    name: str,
    detected: bool,
    confidence: float,
    attempts: int,
    elapsed: float,
    text: Optional[str],
    icon: Optional[str],
    diagnostics: dict
)

Always check detected before acting on the result.

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🧪 Diagnostics & Debugging

Nano-Wait-Vision supports verbose diagnostics:

vision = VisionMode(verbose=True)
state = vision.wait_text("Terminal")

Diagnostics include:

• Attempts per phase
• Confidence scores
• Elapsed time
• Reason for failure

A full macOS diagnostic test is provided in test_screen.py, generating debug screenshots for inspection.

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🖥️ Platform Notes

macOS (Important)

• Screen capture requires Screen Recording permission.
• OCR requires RGB images (internally handled by Nano-Wait-Vision).
• Fully tested on macOS Retina displays.

Windows & Linux

• Works out of the box.
• Ensure correct DPI scaling on Windows for accurate coordinate mapping.

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🧪 Ideal Use Cases

Use Nano-Wait-Vision when dealing with:

• RPA (Robotic Process Automation)
• GUI automation and testing
• OCR-driven workflows
• Visual regression tests
• Applications without APIs
• Screen-based alternatives to Selenium

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🧩 Design Philosophy

• Deterministic: Predictable behavior based on visual truth.
• Explainable: Clear diagnostics for every action.
• No opaque ML: Uses reliable computer vision techniques.
• System-aware: Respects system resources via nano-wait.
• Debuggable by design: Built-in tools for troubleshooting.

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🧪 Selenium / Pytest Integration

Selenium-style Visual Waits

from nano_wait_vision.selenium import VisionWait

wait = VisionWait(timeout=15)
wait.until_text("Dashboard")
wait.until_icon("ok.png")

Pytest Fixture

def test_homepage(vision):
    assert vision.wait_text("Welcome")

Pytest fixture is available via nano_wait_vision.pytest_fixture.vision

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📄 License

This project is licensed under the MIT License.