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What's the difference in taste between expensiv...
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oec
September 01, 2025
How-to & DIY
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What's the difference in taste between expensive and cheap mills? Measuring coffee particle size distribution using ImageJ
oec
September 01, 2025
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Transcript
ߴ͍ϛϧͱ͍҆ϛϧඒຯ͠͞ͷҧ͍ʁ ImageJΛͬͨίʔώʔͷཻܭଌͷ ΦʔΠγ
͓͍͠͞ɺࢲ͕ͨͪʑͳʹΛ৯ɺͳʹΛҿΉ͔ΛબͿ ্Ͱ͔ܽͤͳ͍ײ֮Ͱ͢ɻ ʮ͓͍͠͞ʯΛσʔλͱͯ͠ѻ͍ɺௐཧ๏ૉࡐͷબɺҭछɺ ͞ΒʹϒϥϯσΟϯάͱ͍ͬͨଟ༷ͳํ໘ͷࣝͷ୳ࡧ։ ൃʹͲ͏ͨ͠Β׆͔͢͜ͱ͕Ͱ͖Δ͔ɻ͜Εڵຯਂ͍ςʔϚ ͩͱߟ͑ΒΕ·͢ɻ
ίʔώʔϫΠϯͷੈքͰɺҰఆͷج४ʹج͍ͮͨೳධՁ ͷख๏͕͢Ͱʹཱ֬͞Ε͍ͯ·͢ɻ͜ΕʹΑΓɺଟ͘ͷਓ͕ڞ ௨ͷΈͰ࣭ΛஅͰ͖ΔΈ͕ଘࡏ͠·͢ɻ ͔͠͠ೳධՁਓؒͷײ֮ʹґଘ͢ΔͨΊɺಉ͡αϯϓϧͰ ධՁऀʹΑͬͯ݁Ռ͕ҟͳͬͨΓɺܦݧͷ༗ແʹΑͬͯධՁ ͷਫ਼͕େ͖͘มΘΔͱ͍ͬͨ՝͍ͬͯ·͢ɻ
͜͏ͨ͠ঢ়گΛ౿·͑Δͱɺʮ͓͍͠͞ʯʹؔ͢ΔࣝΛΑ ΓσʔλతʹΞοϓσʔτ͍ͯ͘͜͠ͱ͕ɺຯͷࣝͷମܥ Խʹͭͳ͕ΔͷͰͳ͍Ͱ͠ΐ͏͔ɻ ࠓճͷൃදͰɺίʔώʔͷ͓͍͠͞Λʮσʔλʯʹม͢ Δͱ͍͏ڵຯ͔Βग़ൃ͠ɺͦͷաఔͰಘΒΕͨখ͞ͳώϯτ Λհ͍ͨ͠ͱࢥ͍·͢ɻ
γϯϓϦϑΝΠͰᔸΕͨίʔώʔ͕ඒຯ͔ͬͨ͠ʂ • γϯϓϦϑΝΠҰࣜͷϖʔύʔϑΟϧλʔͷυϦούʔ • ίʔώʔͷຯ͕΄΅ίʔώʔͷคͷࡉ͔͞Ͱܾ·ΔͨΊ࡞Γखͷٕ ज़ʹຯ͕ࠨӈ͞Ε͍࠶ݱੑ͕ߴ͍ • ଞͷϖʔύʔυϦοϓΑΓ͔ͳΓࡉ͔ͷคΛ͏ • ΧϑΣͰҿΜͩίʔώʔ͕ඒຯ͔ͬͨ͠ͷͰɺࣗͰ͜ͷຯʹۙͮ
͚ΔΑ͏ʹ৭ʑࢼͯ͠Έ·ͨ͠
None
༻ͨ͠ίʔώʔάϥΠϯμʔ • Mahlkonig EK43 (ΧϑΣͷߴՁͳάϥΠϯμʔɾళ಄ͰҿΉͷͱ ಉ͡ϝογϡͰ౾ΛṢ͍ͯΒͬͨ) • Cores330 • Timemore
S3ʢൺֱͷϓϩοτল͖·͕͢Coresͱ΄΅ಉ͡ Ͱ͢ʣ
Cores330 (22,000ԁ͙Β͍) Mahlkonig EK43(500,000ԁ͙Β͍)
౾ • Ethiopia Sidama G1 Natural • HugcoffeeͰᖿḦ
ࡱӨػࡐɿiPhone, ϚΫϩϨϯζ, LEDϦϯάϥΠτ
ཻܘͷղੳํ๏ʢ1. ࡱӨʣ ళͰṢ͍ͯΒͬͨ౾ͱࣗͰṢ͍ͨ౾Λܘ5cmͷԁܗͷʹ ॏͳΒͳ͍Α͏ʹࢃ͍ͯiPhoneͰࡱӨ
ཻܘͷղੳํ๏ʢ2. ImageJͰଌఆʣ 1. iPhoneͰࡱӨͨࣸ͠ਅΛಡΈࠐΉʢJPEGมࡁΈʣ 2. ImageΛ8bitʹม 3. Analyze scaleͰ50mmͷܘΛར༻ͯ͠εέʔϧઃఆ 4.
Thresholdઃఆ 5. Analyze particles
ࠓճͷଌఆଌఆख๏Λߟ͑ͳ͕Βͷࢼߦࡨޡͷ్தͷ݁ՌͰαϯ ϓϧࡱӨ࣌ͷޡؚ͕ࠩ·Ε·͢ɻ·ͨαϯϓϦϯάҰͷΈͰࡁ ·͓ͤͯΓޡࠩͷӨڹͦΕͳΓʹ͋Δͱߟ͍͑ͯ·͢ɻ
ईɾཁ౷ܭྔͷબఆ • ImageJͰίʔώʔคͷཻܘʢFeretʣͱ໘ੵʢAreaʣΛऔಘ͢Δ ͜ͱ͕Ͱ͖Δ • ίʔώʔͷʮཻʯͱݴ͏ݴ༿͘ΘΕ͍ͯΔ͚ͲҰൠʹ Ͳͷཁ౷ܭྔ͕ΘΕ͍ͯΔͷ͔ෆ໌ • ࠓճॾʑଌఆͨ݁͠ՌɺΑΓίʔώʔͷೱʹؔͷߴ͍ଐੑ ͱͯ͠KDE
PeakʢҰൠతʹҙຯ͢Δཻܘͱ͍ۙؾ͕͠·͢ʣɺิ ॿతʹதԝΛத৺ʹཻΛஅ͢Δ͜ͱʹ͠·͢ɻ • Area͕ຯɾೱͷد༩͕ߴͦ͏ͳͷͰAreaͷΛओʹར༻͠ ·͕͢ҰൠʹཻཻܘͷදΛࢦ͢͜ͱ͕ଟ͍Α͏ʹࢥ͍ ·͢ɻ
ImageJͷଌఆ݁Ռ 3FTVMUT@ "SFB 4UE%FW 'FSFU 'FSFU9 'FSFU: 'FSFU"OHMF .JO'FSFU
1αϯϓϧʹ͖ͭ300~400ཻࢠΛܭଌ͢Δ͜ͱ͕Ͱ͖·ͨ͠
ՄࢹԽͱදͷूܭ ίʔώʔͷཻώετάϥϜͰද͞ΕΔ͜ͱ͕ଟ͍ʢؾ͕͢ ΔɾͦͦͦΕ΄Ͳݟͳ͍ʣͷͰ͕͢ɺώετάϥϜαϯϓϧ ؒͷൺֱ͕ݟ͍ͨΊɺՄࢹԽʹΑΓෳαϯϓϧͷൺֱͷϓ ϩοτʹ͍ͨKDEʢKernel Density EstimationʣΛ͏͜ͱʹ͠ ·ͨ͠ɻ
ࣗͷάϥΠϯμʔͰϕϯνϚʔΫͷ౾ͷཻͲͷ͋ͨΓʁ
Mahlkonig EK43ͷϕϯνϚʔΫͷίʔώʔͷཻܘMedianͩͱ0.73mm, KDEϐʔΫͩͱ0.52mm͋ͨΓɻ Cores330Ͱಉ͘͡Β͍͙Β͍ͷࡉ͔͞ʹͳΔϝϞϦ4.0ҐʹͳΓͦ͏Ͱ͢
Coresͷ4ϝϞϦͷཻΛৄࡉʹΈͯΈΔ
• Cores4ϝϞϦͷKDE PeakͱதԝEK43ͱಉ͙͡Β͍ • ͠ඪ४ภࠩ༗ҙʹCoresͷ4ϝϞϦͷํ͕େ͖͍ʢLevene ݕఆͷ݁Ռ: p=0.0254 → ༗ҙࠩ͋Γʣ •
ඪ४ภࠩͷ͕େ͖͍ͷɺCoresͷํ͕ૈཻ͍ࢠ͕ଟཻ͘ ͕Ұʹूத͍ͯ͠ͳ͍͜ͱΛ͍ࣔͯ͠Δ
,%&ͰίʔώʔͷཻͷͰݱ࣮ʹ͋Γಘͳ͍ϚΠφεͷϓϩοτ͞Εͯ͠ ·͏ͨΊɺຊདྷͰ͋Ε̌ۙͷͷॲཧ͕ඞཁͰ͢ɻ ˢTFBCPSOͷϓϩοτͷΦϓγϣϯͰDMJQΛࢦఆ͠ҎԼͷΛόοαϦ͍ͬͯ· ͢ɻଞͷํ๏͋ΔͨΊҎԼͷॲཧʹ͍ͭͯݕ౼͕ඞཁͱࢥ͍·͢ɻ
ίʔώʔͷೱ͞ͷൺֱ DeFluidͷTDSೱܭΛ͍EK43ͱCoresͷ4.0ϝϞϦͷίʔώʔͷೱΛൺֱ͠·͢ɻ
&,ϕϯνϚʔΫ $PSFTϝϞϦ
w ཻܘͷද౷ܭ͕ಉ͡Α͏ͳίʔώʔͷคͰ͋ͬͯ&,ͰᔸΕ ͨίʔώʔͷํ͕ೱ͕ೱ͔ͬͨɻ w ͜Ε$PSFTͷཻͷΒ͖͕ͭ༗ҙʹେ͖͍ͨΊɺૈཻ͍ࢠ͕ ଟ͍ӨڹͰɺೱ͕͍ͷͰͳ͍͔ͱ༧͍ͯ͠Δɻ w ͰΑΓࡉཻ͔͍ʹͨ͠Βಉ͡ຯʹͳΔ͔ͱݴ͏ͱɺࡉ͔͗͢Δཻ ͷίʔώࡶຯ͕ग़͘͢ຯతʹಉ͡Α͏ͳຯʹͳΔ͔ͱ͍͏ͱ ͕ٙ͋Δɻ
݁ w J1IPOFͷࡱӨͱ*NBHF+ɺ,%&ΛͬͯɺࣗͷάϥΠϯμʔͷཻΛΧ ϑΣͷϕϯνϚʔΫͷṢ͖ʹ͚ۙͮΔ͜ͱ͕Ͱ͖ͨɻ w ۀ༻άϥΠϯμʔΑΓཻࢠαΠζͷूத͕ߴ͘ɺՈఉ༻ͰཻࢠαΠ ζ͕όϥ͕ͭ͋͘Δɻ w Ոఉ༻ͷάϥΠϯμʔͰۀ༻ͷຯʹ͚ۙͮΑ͏ͱ͢Δͱɺۀ༻άϥΠϯ μʔΑΓࡉ͔͘Ṣ͘ඞཁ͕͋Δ͔͠Εͳ͍
w ཻ͕ҟͳΔͨΊՈఉ༻ͷάϥΠϯμʔͰۀ༻άϥΠϯμʔͰṢ͍ͨ ίʔώʔͷຯΛ࠶ݱͰ͖Δ͔ͱ͍͏ͱɺ؆୯Ͱͳ͍͔͠Εͳ͍ɻγϯ ϓϦϑΝΠͷΑ͏ͳίʔώʔͷࡉ͔͕͞ॏཁͳᔸΕํͷ߹ಛʹɻ w ͨͩ͠ࠓճͷ݁Ռʮۀ༻άϥΠϯμʔʢཻ͕Ұʹἧͬͨคʣͷํ ͕ඒຯ͍͠ʯͱݴ͏͜ͱΛ͘ҙຯ͢ΔͷͰͳ͍ɻҰൠతͳυϦοϓ ͩͱϝογϡҎ֎ͷӨڹେ͖͍Ͱ͢ɻ
ࠓޙʹ͍ͭͯ • iPhoneͰࡱͬͨࣸਅΛૹΔͱཻͷܭଌɾϓϩοτ·Ͱશʹࣗಈ Ͱߦͬͯ͘ΕΔΑ͏ͳAPIΛ࡞Δ༧ఆ • ͍͔ͭ͘ͷϢʔεέʔεΛఆ͠ɺࠓճͷΑ͏ʹϕϯνϚʔΫͷཻ ͱຯʹࣗͷάϥΠϯμʔͷϝϞϦΛ߹ΘͤΔͨΊॿݴࣗͷ άϥΠϯμʔͷͲͷϝϞϦ͕ͲͷυϦοϓʹ߹͍ͬͯΔ͔ڭ͑ͯ͘ ΕΔίϝϯτΛੜ͢ΔαʔϏεΛߏங͍ͨ͠ •
ຊདྷͷతͰ͋Δɺඒຯ͍͠ίʔώʔΛ࣭ྔੳ͠ίʔώʔͷӷମ ͷͷૉੑͱόϦελͷೳධՁͱͷ૬ؔੳΛߦ͍͍ͨ
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