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Design Comparison Tool: Bridging UI/UX Design and Implementation

Overview

The Design Comparison Tool is a web application that quantitatively compares Figma design screenshots with implemented screen captures. It provides:

  1. A structural similarity score
  2. Visual representation of design discrepancies

Target Users

  • UI/UX Developers
  • Design Teams
  • Quality Assurance Professionals

Functionality

  1. Image Upload: Figma design and implemented screen
  2. Image Processing: Utilizes computer vision techniques
  3. Comparison Generation: Produces a composite image highlighting differences
  4. Results: Outputs a similarity score and visual discrepancy map

Core Technologies

  • Flask: Python web framework for backend operations
  • OpenCV: Image processing and computer vision tasks
  • Scikit-image: Structural Similarity Index (SSIM) calculation
  • NumPy: Efficient array operations and data manipulation

Technical Details: Image Comparison Process

  1. Image Preprocessing:

    • Images are read using OpenCV
    • Figma design image is resized to match the built screen dimensions
    • Both images are converted to grayscale

  2. Structural Similarity Index (SSIM) Calculation:

    • Scikit-image's SSIM function compares the grayscale images
    • Measures similarity based on luminance, contrast, and structure
    • Outputs a similarity score and difference image

  3. Difference Analysis:

    • Difference image is normalized and thresholded using Otsu's method
    • Contours are detected in the thresholded image

  4. Visualization:

    • Significant differences (contours > 40 pixels) are highlighted
    • Green rectangles on Figma design, red on built screen
    • A filled version shows differences in red

  5. Result Generation:

    • Composite image created by stacking annotated images
    • Similarity score converted to percentage
    • Unique filename generated using current date and time

Key Benefits

  • Accelerates design review processes
  • Enhances design-development team communication
  • Provides quantitative metrics for design fidelity
  • Facilitates early detection of design inconsistencies

Future Developments

  • AI-driven suggestions for design discrepancy resolution
  • Integration with popular design and development platforms

Conclusion

The Design Comparison Tool offers an objective, efficient method for ensuring design implementation accuracy, streamlining the UI/UX development workflow.