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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

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

Testing Group

Troy Chinen, Fujifilm Software California

Alan Chien, Eastman Kodak


Testing goals
Testing Goals Performance (N1583)

  • 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.


Testing method
Testing method Performance (N1583)

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


Testing method ctd
Testing Method (ctd) Performance (N1583)

  • 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


Testing method ctd1
Testing Method (ctd) Performance (N1583)

  • Hardcopy: 300 dpi, 24 bit color

  • Blind testing

  • 6 Observers

  • VL (visually lossless) rankings were not included in the summarizing statistics


Results aggregate
Results: aggregate Performance (N1583)

11%

18%

36%

53%

Error bars = 2 sigma


Results bike
Results: bike Performance (N1583)


Results bottles
Results: bottles Performance (N1583)


Results bride
Results: bride Performance (N1583)


Results harbor
Results: harbor Performance (N1583)


Results woman
Results: woman Performance (N1583)


Results wool
Results: wool Performance (N1583)


Qualitative results
Qualitative Results Performance (N1583)

  • No color distortions observed

  • Most JP2 images at 1.0bpp were VL (in print)

  • Trends:


Conclusions
Conclusions Performance (N1583)

  • 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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