Algorithm 2. Finding Optimal Machine and Compression Parameters.

given environment parameters

pcompress← compression application's parallelism

B ← network bandwidth

D0← user's requirement for image/video quality

find machine's parameters by using algorithm 1

f←f_opt

n←n_opt

set the default compress parameter

q ← maximum image/video quality parameter

do{

calculate Ecomp+trans(f, n, pcompress, q, B)

q_next← next decreased image/video quality parameter

calculate Ecomp+trans(f, n, pcompress, q_next, B)

if (Ecomp+trans(f, n, pcompress, q_next, B)<Ecomp+trans(f, n, pcompress, q, B))

q←q_next

} while (D(q) >D0)

q_opt←q // found optimal compress parameter