Research Article

Combining Fractal Coding and Orthogonal Linear Transforms

Table 1

Comparison among Saupe's operator and several LT-based feature vectors on the Lena image 512 × 512 for a compression ratio fixed at 16.5 without residual information coding (first two columns) and with residual information coding (last two columns).

MethodWithout residual codingWith residual coding
TimePSNRTimePSNR

Saupe20.05 sec32.90 dB23.05 sec33.44 dB
PIFS-LFT21.35 sec31.92 dB24.67 sec32.45 dB
PIFS-LTD23.15 sec33.94 dB26.50 sec34.60 dB
PIFS-LTH22.45 sec33.95 dB25.24 sec34.80 dB