Download as PDF, PPTX
![RQ2: Energy and complexity
0.0
2.5
5.0
7.5
10.0
0 20 40
Time [s]
Energy[s]
Process
Decode
Encode
E = P · t](https://image.slidesharecdn.com/presentationgreens2015imagecodecs-150519084428-lva1-app6891/85/Energy-Consumption-Analysis-of-Image-Encoding-and-Decoding-Algorithms-12-320.jpg)
Uploaded byMarco Torchiano
Energy Consumption Analysis of Image Encoding and Decoding Algorithms
The document analyzes energy consumption in various image encoding and decoding algorithms, specifically comparing formats like PNG and JPEG at different quality levels. Key findings indicate that decoding PNG images consumes approximately twice the energy of JPEG, with encoding PNG requiring six times more energy. The study also correlates energy consumption with computational performance, highlighting questions about identifying power-efficient algorithms with similar complexity.
Energy Consumption Analysis of Image Encoding and Decoding Algorithms
- 1. Energy Consumption Analysis ofImage Encoding and Decoding Algorithms Mohammad Rashid, Luca Ardito, and Marco Torchiano GREENS 2015
- 2. Motivation Energy consumption representsan important issue with limited and embedded devices
- 3. On all connecteddevices IIIIIIIIII I::::::::I I::::::::I II::::::II I::::I mmmmmmm mmmmmmm aaaaaaaaaaaaa ggggggggg ggggg eeeeeeeeeeee ssssssssss aaaaaaaaaaaaa rrrrr rrrrrrrrr eeeeeeeeeeee I::::I mm:::::::m m:::::::mm a::::::::::::a g:::::::::ggg::::g ee::::::::::::ee ss::::::::::s a::::::::::::a r::::rrr:::::::::r ee::::::::::::ee I::::I m::::::::::mm::::::::::m aaaaaaaaa:::::a g:::::::::::::::::g e::::::eeeee:::::eess:::::::::::::s aaaaaaaaa:::::ar:::::::::::::::::r e::::::eeeee:::::ee I::::I m::::::::::::::::::::::m a::::ag::::::ggggg::::::gge::::::e e:::::es::::::ssss:::::s a::::arr::::::rrrrr::::::re::::::e e:::::e I::::I m:::::mmm::::::mmm:::::m aaaaaaa:::::ag:::::g g:::::g e:::::::eeeee::::::e s:::::s ssssss aaaaaaa:::::a r:::::r r:::::re:::::::eeeee::::::e I::::I m::::m m::::m m::::m aa::::::::::::ag:::::g g:::::g e:::::::::::::::::e s::::::s aa::::::::::::a r:::::r rrrrrrre:::::::::::::::::e I::::I m::::m m::::m m::::m a::::aaaa::::::ag:::::g g:::::g e::::::eeeeeeeeeee s::::::s a::::aaaa::::::a r:::::r e::::::eeeeeeeeeee I::::I m::::m m::::m m::::ma::::a a:::::ag::::::g g:::::g e:::::::e ssssss s:::::s a::::a a:::::a r:::::r e:::::::e II::::::IIm::::m m::::m m::::ma::::a a:::::ag:::::::ggggg:::::g e::::::::e s:::::ssss::::::s a::::a a:::::a r:::::r e::::::::e I::::::::Im::::m m::::m m::::ma:::::aaaa::::::a g::::::::::::::::g e::::::::eeeeeeee s::::::::::::::s a:::::aaaa::::::a r:::::r e::::::::eeeeeeee I::::::::Im::::m m::::m m::::m a::::::::::aa:::a gg::::::::::::::g ee:::::::::::::e s:::::::::::ss a::::::::::aa:::ar:::::r ee:::::::::::::e IIIIIIIIIImmmmmm mmmmmm mmmmmm aaaaaaaaaa aaaa gggggggg::::::g eeeeeeeeeeeeee sssssssssss aaaaaaaaaa aaaarrrrrrr eeeeeeeeeeeeee g:::::g gggggg g:::::g g:::::gg gg:::::g g::::::ggg:::::::g gg:::::::::::::g ggg::::::ggg gggggg bbbbbbbb b::::::b iiii iiii tttt b::::::b i::::i i::::i ttt:::t b::::::b iiii iiii t:::::t b:::::b t:::::t uuuuuu uuuuuu b:::::bbbbbbbbb iiiiiii qqqqqqqqq qqqqquuuuuu uuuuuu iiiiiiittttttt:::::ttttttt ooooooooooo uuuuuu uuuuuu ssssssssss u::::u u::::u b::::::::::::::bb i:::::i q:::::::::qqq::::qu::::u u::::u i:::::it:::::::::::::::::t oo:::::::::::oo u::::u u::::u ss::::::::::s u::::u u::::u b::::::::::::::::b i::::i q:::::::::::::::::qu::::u u::::u i::::it:::::::::::::::::t o:::::::::::::::ou::::u u::::u ss:::::::::::::s u::::u u::::u b:::::bbbbb:::::::b i::::i q::::::qqqqq::::::qqu::::u u::::u i::::itttttt:::::::tttttt o:::::ooooo:::::ou::::u u::::u s::::::ssss:::::s u::::u u::::u b:::::b b::::::b i::::i q:::::q q:::::q u::::u u::::u i::::i t:::::t o::::o o::::ou::::u u::::u s:::::s ssssss u::::u u::::u b:::::b b:::::b i::::i q:::::q q:::::q u::::u u::::u i::::i t:::::t o::::o o::::ou::::u u::::u s::::::s u::::u u::::u b:::::b b:::::b i::::i q:::::q q:::::q u::::u u::::u i::::i t:::::t o::::o o::::ou::::u u::::u s::::::s u:::::uuuu:::::u b:::::b b:::::b i::::i q::::::q q:::::q u:::::uuuu:::::u i::::i t:::::t tttttto::::o o::::ou:::::uuuu:::::u ssssss s:::::s u:::::::::::::::uub:::::bbbbbb::::::bi::::::iq:::::::qqqqq:::::q u:::::::::::::::uui::::::i t::::::tttt:::::to:::::ooooo:::::ou:::::::::::::::uus:::::ssss::::::s u:::::::::::::::ub::::::::::::::::b i::::::i q::::::::::::::::q u:::::::::::::::ui::::::i tt::::::::::::::to:::::::::::::::o u:::::::::::::::us::::::::::::::s uu::::::::uu:::ub:::::::::::::::b i::::::i qq::::::::::::::q uu::::::::uu:::ui::::::i tt:::::::::::tt oo:::::::::::oo uu::::::::uu:::u s:::::::::::ss uuuuuuuu uuuubbbbbbbbbbbbbbbb iiiiiiii qqqqqqqq::::::q uuuuuuuu uuuuiiiiiiii ttttttttttt ooooooooooo uuuuuuuu uuuu sssssssssss q:::::q q:::::q q:::::::q q:::::::q q:::::::q qqqqqqqqq
- 4. Plan Object: image codecalgorithms Purpose: assessing differences Focus: energy consumption Context: Raspberry PI
- 5. Research Questions • RQ1:Do different codecs consume different amounts of energy for encoding/decoding images? • Metric: total energy • RQ2: How closely are energy consumption and computational performance correlated? • Metrics: Enegy vs. time, and Power
- 6.
- 7. CodecsPNG JPG, q:10 JPG,q:80JPG, q:40
- 8.
- 9. Instrumentation Raspberry Pi +USB Tester OLED Backpack 2.0
- 10. RQ1: codec consumption Task☞ DECODING ENCODING CODEC☟ Energy Time Energy Time PNG 1.78 9.6 6.16 39.0 JPEG, Q:10 0.94 4.5 1.05 7.6 JPEG, Q:40 0.76 3.4 0.84 2.7 JPEG, Q:80 0.68 2.9 0.78 2.7 Average values over the three images, values for five repetitions of the task
- 11. Consumption == 70k PNG decode 130kJPG:10 decode 160k JPG:40 decode 180k JPG:80 decode { or or or (c) iFixIt - Walter Galan
- 12. RQ2: Energy andcomplexity 0.0 2.5 5.0 7.5 10.0 0 20 40 Time [s] Energy[s] Process Decode Encode E = P · t
- 13. Mean Power vs.Total Energy A B C A B C DecodeEncode jpg:Q80 jpg:Q40 jpg:Q10 png:LL Codec:Quality Image 0.15 0.17 0.20 0.23 Power A B C A B C DecodeEncode jpg:Q80 jpg:Q40 jpg:Q10 png:LL Codec:Quality Image 2.5 5.0 7.5 Energy
- 14. Key Findings • Decodinga PNG image consumes ~2 times as much energy as for a JPG image • ~6 times for encoding • Energy consumption is strongly correlated to time • Other factors affect the energy marginally • The average power consumption variation among algorithms is ~10%
- 16. Open Questions • Canwe identify algorithms that with a similar computational complexity consume less power? • What are the features in software that can affect power consumption?