image-compare

Simple image comparison in rust based on the image crate

Note that this crate is heavily work in progress. Algorithms are neither cross-checked not particularly fast yet. Everything is implemented in plain CPU with no SIMD or GPU usage.

Supported now:

• Comparing grayscale and rgb images by structure
  • By RMS - score is calculated by:
  • By MSSIM
    • SSIM is implemented as described on wikipedia:
    • MSSIM is calculated by using 8x8 pixel windows for SSIM and averaging over the results
  • RGB type images are split to R,G and B channels and processed separately. The worst of the color results is propagated as score but a float-typed RGB image provides access to all values.
• Comparing grayscale images by histogram
  • Several distance metrics implemented see OpenCV docs:
    • Correlation
    • Chi-Square
    • Intersection
    • Hellinger distance

Planned:

• Histogram comparison for RGB images
• SIMD for RMS and MSSIM