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Visual Evaluation of JPEG 2000 Color Image Compression Performance (N1583)

Visual Evaluation of JPEG 2000 Color Image Compression Performance (N1583). Testing Group Troy Chinen, Fujifilm Software California Alan Chien, Eastman Kodak. Testing Goals. Quantitative

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Visual Evaluation of JPEG 2000 Color Image Compression Performance (N1583)

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  1. Visual Evaluation of JPEG 2000 Color Image Compression Performance (N1583) Testing Group Troy Chinen, Fujifilm Software California Alan Chien, Eastman Kodak

  2. Testing Goals • Quantitative • For a given set of JPEG 2000 bitrates, compute the corresponding quality-equivalent JPEG bitrates for color images. • Qualitative • Characterize JPEG 2000 color compression artifacts.

  3. Testing method Ordered JPEG images • Insert JPEG 2000 images between JPEG images of bounding quality. • Record mean number of bytes for each insertion; fit to Gaussian distribution 1 2 3 4 5 6 7 8 9 10 0.3bpp 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2 1.4 C(0.25bpp) B(0.5bpp) A(0.75bpp) D(1.0bpp) VL Unordered JPEG 2000 images

  4. Testing Method (ctd) • 6 scenes: bike, bottles, bride, harbor, woman, wool • 10 Reference JPEG images per scene • default mode cjpeg, optimized Huffman tables • 0.3 ~ 1.0 (0.1 increments), 1.2, 1.4bpp • 4 JPEG 2000 images per scene • Default mode, VM5.2 • Fweights table T15PB • 0.25, 0.50, 0.75, 1.0 bpp

  5. Testing Method (ctd) • Hardcopy: 300 dpi, 24 bit color • Blind testing • 6 Observers • VL (visually lossless) rankings were not included in the summarizing statistics

  6. Results: aggregate 11% 18% 36% 53% Error bars = 2 sigma

  7. Results: bike

  8. Results: bottles

  9. Results: bride

  10. Results: harbor

  11. Results: woman

  12. Results: wool

  13. Qualitative Results • No color distortions observed • Most JP2 images at 1.0bpp were VL (in print) • Trends:

  14. Conclusions • JPEG 2000 filesizes are smaller than JPEG by • 53% at 0.25bpp • 36% at 0.5 bpp • 18% at 0.75 bpp • 11% at 1.0 bpp • Distortion types of JPEG and JPEG 2000 are fundamentally different, nevertheless consistent rankings were observed.

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