Experimetal results of IAD and CAI methods by 
Sang-Yong Lee and Antonio Ortega


This web page is created to serve the purpose of illustrating the results of CAI and IAD methods. For the IAD method, rotation transform and 64 by 64 block format conversion is used.

Experimental results


Original image (Macaw) 512x512, RGB bitmap, 786.432KB

Images after applying interpolation (used as Reference images to calculate PSNR)

  1. Bilinear interpolation
  2. Interpolation by C. A. Laroche and M. A. Prescott
  3. Interpolation by T. Freeman

Comparison under a fixed compression ratio (~15:1)

  1. Bilinear interpolation, JPEG (PSNR gain: 1.39dB)
    CAI: 37.858KB, 42.78dB
    IAD: 37.826KB, 44.17dB
    Side by side comparison (x6) [left: IAD, center: Reference, right: CAI]
  2. Interpolation by C. A. Laroche and M. A. Prescott, SPIHT (PSNR gain: 1.25dB)
    CAI: 39.322KB, 42.93dB
    IAD: 39.322KB, 44.18dB
  3. Interpolation by T. Freeman, SPIHT (PSNR gain: 0.64dB)
    CAI: 39.322KB, 43.25dB
    IAD: 39.322KB, 43.89dB
    Side by side comparison (x6) [left: IAD, center: Reference, right: CAI]

Comparison under (visually) near-lossless compression (PSNR: ~48dB)

  1. Bilinear interpolation, JPEG (Bit-rate gain: 22.239KB)
    CAI: 90.306KB, 42.62dB
    IAD: 68.067KB, 47.82dB
  2. Interpolation by T. Freeman, SPIHT (Bit-rate gain: 11.207KB)
    CAI: 88.376KB, 48.00dB
    IAD: 77.169KB, 48.00dB