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色恒常性仮説に基づく色補正ライブラリcolorcorrect / 2015-01-31-kantocv27
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shunsukeaihara
January 30, 2015
Technology
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色恒常性仮説に基づく色補正ライブラリcolorcorrect / 2015-01-31-kantocv27
@関東CV勉強会 2015/01/31
shunsukeaihara
January 30, 2015
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Transcript
colorcorrect ৭߃ৗੑԾઆʹجͮ͘৭ิਖ਼ϥΠϒϥϦ Gunosy inc Shunsuke Aihara
ࣗݾհ • ҄൧ݪढ़հ (http://argmax.jp) @shunsukeaihara • GunosyͷϚωʔδϟʔ • ࠂ৴γεςϜͷ։ൃશମͱR&DܥΛ୲ •
ઐ: ܭࢉݴޠֶ • PythonͱඇಉظࢄγεςϜΛΉ • DNN࣭มͱ͔झຯͰͬͯΔ • ը૾ॲཧɾԻ৴߸ॲཧͰ͍Ζ͍ΖϥΠϒϥϦ࡞ͬͯΔ • https://bitbucket.org/aihara
͜Εը૾ೝࣝͷͨΊͷ ຯͳલॲཧͷͰ͢
colorcorrect
৭߃ৗੑ/໌Δ͞߃ৗੑͷԾઆʹج͖ͮ ม৭ɾwhite baranceͷζϨΛࣗಈิਖ਼
ը૾ͷޫݯ৭ͱϗϫΠτόϥϯε ࣮σʔλͰόϥόϥ • ৭Λ༻͍ͨମೝࣝΛߦ͓͏ͱ͢Δͱɺֶशσʔληοτͱ৭͕ͣΕ͍ͯΔͱఆਫ਼ མͪΔ • ৭ใΛ༻͍ͨBag-Of-Keypointܥͷख๏Ͱ݁ߏ৭ิਖ਼͕ޮ͍ͯ͘Δ • ྨࣅը૾ݕࡧ /
ܠ؍ը૾͔Βͷମݕग़ͱ͔࡞ͬͨ࣌ʹ૬ϋϚͬͨ • Deep Learningͱ͔͍Ζ͍Ζظͯ͠Δ͚Ͳɺ࣮ࡍʹࣄͰֶशσʔληοτूΊΔͱ ͳΔͱ͍ΖΜͳࡱӨ݅ͷը૾ूΊΔͷ݁ߏେม • ෳর໌݅ʹର͢ΔData AugmentationΑ͘Θ͔Βͳ͍ • ͋ͱɺը૾ͷݟͨΩϨΠʹ͍ͨ͠ͱ͔͍Ζ͍Ζ͋Δ • ͳΜͱָ͔͔ͨͬͨ͠ͷͰิਖ਼ख๏ͷจͱ͔͍Ζ͍Ζௐͨ
༻్ • ม৭ͨࣸ͠ਅͷิਖ਼ • ઃఆϛεͬͯࡱͬͨࣸਅͷमਖ਼ • ίϯσδͰઃఆؒҧ͑ͯࡱͬͨࣸਅͱ͔ • ମೝࣝͷલॲཧ •
దʹެ։͓͍ͯͨ͠ΒCVPR2013ͷจͰ࣮ ࡍʹΘΕͨʂ
͋ͱ᧙৭ը૾Λ͔ͨͬͨ͠ ͜Ε৭ͷใ͕ࣦΘΕ͍ͯΔͷͰͲ͏ͬͯϜϦ
pip install colorcorrect
৭߃ৗੑ (Color Constancy) ໌Δ͞߃ৗੑ (lightness constancy)
• র໌ޫͷεϖΫτϧ͕มԽͯ͠ɺମ৭ͷ ೝେ͖͘มԽ͠ͳ͍(ݩͷ৭͕ೝࣝͰ͖Δ) ৭߃ৗੑ
νΣοΧʔγϟυʔࡨࢹ ໌Δ͞ͱਓ͕ؒೝͨ͠ͷͱҟͳΔ ྡ෦ҐͷίϯτϥετʹӨڹΛड͚ͯҟͳΔೝ 'SPN8JLJNFEJB$PNNPOT
৭ͷ֮ͷ؆୯ͳϞσϧ • ʹೖࣹ͢ΔޫޫݯޫͱରͷޫࣹͰܾ· Δ • ৭߃ৗੑೖࣹޫ͔ΒޫݯޫΛਪఆͯ͠ɺޫࣹ Λਪఆ͢Δͱఆٛग़དྷΔ S( ) =
I( ) · R( ) • S(λ) ೖࣹޫ • I(λ) ޫݯޫ • R(λ) ମͷޫࣹ
৭߃ৗੑԾઆͷ؆୯ͳ • փ৭Ծઆ • ന৭ޫݯԼͷ߹ɺࢹ֮ͷ৭ͷฏۉΛऔΔͱփ৭ (127,127,127)ʹͳΔͣͳͷͰͦͷζϨΛิਖ਼͢Δ • ً - ৭૬ؔ
• ࢹ֮ͷ৭ʹภΓ͕͋Δ߹փ৭ԾઆͰ߃ৗੑΛ୲อग़ དྷͳ͍ͷͰɺًͱ৭ͷ૬͔ؔΒ৭ͷภΓ͕ޫݯʹΑΔ͔ݩ ͷମ৭ʹΑΔ͔ਪఆͯ͠ิਖ਼ • ͜ΕΒΛϕʔεʹ༷ʑͳΞϧΰϦζϜ͕ఏҊ͞Ε͍ͯΔ
Algorithms
࣮ͨ͠৭߃ৗੑΞϧΰϦζϜ • gray world • max white • stretch •
retinex, retinex with adjust • weighted grey world • standard deviation weighted grey world • luminance weighted gray world • standard deviation and luminance weighted gray world • automatic color equalization • ->ώϡʔϦεςΟΫε͚ͩͲิਖ਼ྗ͕͍͢͝
Implementation
࣮ • PythonʹΑΔ࣮(2ܥ) • PIL • Numpy • ͕ඞཁͳ෦C++ͷϥΠϒϥϦΛ numpy.ctypesͰϥοϓ
• pip install colorcorrectͰར༻Մೳ
DEMO http://colorcorrect.argmax.jp/
·ͱΊ • खܰʹը૾ͷ৭ิਖ਼͕ग़དྷͯศརͳͷͰͬͯΈ ͍ͯͩ͘͞ • Python3ܥ + PillowରԠͦΖͦΖ͠·͢ • ԻͷલॲཧϥΠϒϥϦͱ͔ެ։ͯ͠·͢
• https://bitbucket.org/aihara/pyssp • Gunosyʹମೝࣝɾը૾clipͷࣄ͋Γ·͢