Sets A1, A2, and A3: Color Images for Lossless Compression Research

Roman Starosolski compiled 136 color images across three sets for research on reversible denoising and lifting-based color component transformation. The A1 set contains 3 high-resolution scans from a Minolta Dimage 5400 film scanner, A2 contains 17 scans from an Agfa e50 scanner, and A3 contains 116 images from an Olympus Stylus XZ-2 consumer camera. Images are stored in PPM P6 format with 8-bit component depth and were used in a submitted paper on lossless image compression.

Use Cases

• Benchmarking lossless compression algorithms based on high-resolution film scans (A1 set).
• Developing color component transformation techniques based on images from a consumer camera with a Bayer-pattern filter (A3 set).
• Testing image processing methods on scanned negatives from a general-purpose scanner (A2 set).

Strengths

• Includes 136 images across three distinct acquisition sources, providing variety.
• A1 set images have high optical resolution, with sizes up to 7424x4864 pixels.
• The A3 set's processing from RAW files using dcraw is documented, detailing the conversion from a Bayer-pattern.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.
• Row count is unknown, which may limit suitability assessment for large-scale training.

Provenance

Source

Roman Starosolski, associated with a research paper submission.

Collection Method

Images were acquired from a film scanner, a flatbed scanner, and a consumer camera, with specific processing steps described for the camera images.