New 🌟 per-class object counting feature and updates

[RizwanMunawar]

Key Updates

• Introduce support for class-wise object counting.
• Rectify a critical bug in object counting where only objects inside the region were counted, treating all others as outcounts. The code is now updated to count objects passing through the region accurately.
• Synchronize heatmap.py with the object counting module.
• Update documentation pages for object_counting.md and heatmaps.md.
• Enhance the object counting display function in plotting.py.

@glenn-jocher

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced Heatmap and Object Counting Documentation and Features

📊 Key Changes

• 📝 Updated guides for heatmaps and object counting to include new functionality.
• 🚀 Added support for polygon counting alongside pre-existing line and region counting.
• 🎨 Improved visualization, allowing display of class names with object counts.
• 🖍️ Changed default colors for text and lines to improve readability.
• 🔍 Included additional customization options like font size and line color for counts display.
• 🌐 Allowed class-wise object counts, enhancing detailed analytics.

🎯 Purpose & Impact

• 🎨 Visualization Improvements: The changes make heatmap generation more intuitive and informational, featuring class-wise counts that can be distinguished easily, enhancing the user experience.
• 🔧 Customization Freedom: Users gain more control over the visual aspects (like colors and font sizes), which allows for better integration into various projects with diverse UI requirements.
• ✔️ Enhanced Functionality: Adding polygon counting and displaying class names broadens the usability of the tool for more complex analytical needs, catering to a wider range of use cases.
• 🎓 Updated Documentation: With clearer, more comprehensive guides, users of all levels can better understand how to utilize the heatmap and object counting features effectively.

[codecov]

Codecov Report

Attention: Patch coverage is 0.86957% with 114 lines in your changes are missing coverage. Please review.

Project coverage is 76.75%. Comparing base (1703025) to head (9a6ea58).

❗ Current head 9a6ea58 differs from pull request most recent head b863689. Consider uploading reports for the commit b863689 to get more accurate results

Files	Patch %	Lines
ultralytics/solutions/heatmap.py	0.00%	53 Missing ⚠️
ultralytics/solutions/object_counter.py	0.00%	49 Missing ⚠️
ultralytics/utils/plotting.py	7.69%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9443      +/-   ##
==========================================
- Coverage   76.92%   76.75%   -0.17%     
==========================================
  Files         117      117              
  Lines       14863    14888      +25     
==========================================
- Hits        11434    11428       -6     
- Misses       3429     3460      +31     

Flag	Coverage Δ
Benchmarks	36.64% <0.86%> (-0.07%)	⬇️
GPU	38.75% <0.86%> (-0.09%)	⬇️
Tests	71.89% <0.86%> (-0.17%)	⬇️

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[glenn-jocher]

@RizwanMunawar awesome, nice work on this!!

[glenn-jocher]

@RizwanMunawar PR merged!