Copy-Paste zero value fix

[glenn-jocher]

@Laughing-q @AyushExel copy-paste zero-value fix here, verified working.

Signed-off-by: Glenn Jocher glenn.jocher@ultralytics.com

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved Copy-Paste augmentation logic for better training efficiency in YOLOv5.

📊 Key Changes

• Changed the color filled in contours from white (255, 255, 255) to (1, 1, 1) during the Copy-Paste augmentation process.
• Simplified the combination of the original and augmented images by removing the bitwise_and operation and redundant pixel replacement logic.
• Retained only the essential image flipping operation and updated how the augmented image pixels are combined with the original.

🎯 Purpose & Impact

• 🎯 The adjustments streamline the Copy-Paste augmentation, potentially improving the training speed and efficiency.
• 🚀 Users might notice faster training times due to the more straightforward augmentation process.
• 📉 The change could reduce computational overhead, indirectly benefiting users with less powerful hardware.