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20181130.pdf
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sug1t0m0
December 20, 2018
Technology
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20181130.pdf
sug1t0m0
December 20, 2018
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Transcript
͜͜Λ͜͏ͨ͠Β͘ͳͬͨ!! (OpenCVͷαϯϓϧίʔυΛ ίϐϖ͔Γ͍͕ͯͨ͠ ؾ͍ͮͯΑ͔ͬͨͱࢥ͏͜ͱ) Sugiyama.T (@sug1t0m0_agrict) #WaterCell Tech Night #2
Python OpenCVͷجૅ ըૉͷΞΫηε (άάΔͱ͙͢ʹग़ͯ͘Δͭ) • ըૉ͝ͱʹ৭Λऔಘ͢Δ blue = img[10, 20,
0] green = img[10, 20, 1] red = img[10, 20, 2] pixelValue = img[Y࠲ඪ, X࠲ඪ, νϟϯωϧ] • ըૉͷॻ͖͑ img[10, 20, 0] = 255 img[10, 20, 1] = 255 img[10, 20, 2] = 255 img[10, 20] = [255, 255, 255] or
Python OpenCVͷجૅ ըૉͷΞΫηε (NumpyΛ͏ͱ) • img_1ͷըૉ(x,y)͕50Ҏ্ͷͱ͖ img_2ͷըૉ(x,y)ͷΛ52ʹ͍ͨ͠ for y in
range(height): for x in range(weight): if img_1[y, x, 0] >= 50 : img_2[y, x, 0] = 52 ɹɹɹɹɹɹɹɹɹɹɹɹɹͱͬͯ͠·͏ • ͰnumpyΛ͏ͱɺɺɺ cond = img_1 >= 50 img_2[cond] = 52 ɹɹɹɹɹɹɹɹɹɹͰɺ͍͚Δʂ
ͬ͘͟Γ(͔ͳΓదʹ)ൺֱ for y in range(height): for x in range(weight): if
img_1[y, x, 0] >= 50 : img_2[y, x, 0] = 52 • time : 0.779437780380249[sec] cond = img_1 >= 50 img_2[cond] = 52 • time : 0.004307746887207031[sec] • Pythonͷfor͍ • ΠϯλϓϦλͷΦʔόʔϔουʁ • ੩తͳܕఆٛΛ࣋ͨͳ͍͔Βʁ
͜ΕBoolean Indexͱ͍͏ͷΒ͍͠ • numpyͷྻൺֱԋࢉࢠͰܭࢉΛߦ͏ͱਅ ِͷྻʹɺɺɺ • ্هͷਅِͷྻΛ͏͜ͱͰɺըૉͷॻ ͖͕͑ߴʹߦ͑Δɺɺɺ
5 5 ' 5 ' 5 5 5 ' =< 2 img [ ]=2 EW W EW EW 5 5 ' 5 ' 5 5 5 '
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