TensorFlow.js で バーチャル背景を作る / virtual background with tfjs

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1. TensorFlow.jsͰ όʔνϟϧഎܠΛ࡞Δ ּݪ ޺ (@kasacchiful) 2020/08/08 (౔) TensorFlow UG Niigata

   #3

2. Software Developer Favorite: Community: • JAWS-UG Niigata • JaSST Niigata

   • ASTER • SWANII • etc. Hiroshi Kasahara @kasacchiful @kasacchiful 2

3. ࠷ۙ͸ϦϞʔτϫʔΫશ੝ • ձٞதͷഎܠΛผͷࣸਅʹͯ͠͠·͏ʮόʔνϟϧഎܠʯΛઃఆͰ͖ Δπʔϧ͕૿͍͑ͯΔ • ͜ΕɺTensorFlow.jsͰ࣮૷Ͱ͖ΔΜ͡Όͳ͍ʁ • ͔֬ɺਓͷηάϝϯςʔγϣϯͰ͖ΔϞσϧެ։͞Ε͍ͯΔ͸ͣ 3

4. ຊ೔ͷ಺༰ • TensorFlow.js Λ࢖ͬͯɺόʔνϟϧഎܠΛ࣮૷ͯ͠Έͨ 4

5. 2೔ ੍࡞ظؒ 5

6. BodyPix Webϒϥ΢βͱTensorFlow.jsΛ ࢖ͬͨϦΞϧλΠϜͷਓ෺ηάϝϯ ςʔγϣϯϞσϧ https://github.com/tensorflow/tfjs-models/tree/master/body-pix Ҿ༻: https://developers-jp.googleblog.com/2019/04/bodypix-tensorflowjs.html 6

7. ॲཧͷྲྀΕ • WebΧϝϥͷಈըΛऔಘ • BodyPixͰਓͷηάϝϯςʔγϣϯΛ࣮ࢪ • ਓҎ֎ͷ෦෼ʢഎܠʣΛଞͷը૾ʹஔ͖׵͑Δ • ʢ͓·͚ʣOBS Virtual

   CameraͰ֤छWebձٞπʔϧʹ౤Ө͢Δ ιʔείʔυ͸ɺBodyPixͷσϞιʔεΛࢀߟʹվมͨ͠ 7

8. ߏ੒ਤ 8 ηάϝϯςʔγϣϯ
   ݁Ռ Χϝϥը૾ͱ
   എܠը૾Λ
   ߹੒ 8FCΧϝϥ ਓ͕өͬͨ
   Χϝϥը૾

   എܠը૾ ϒϥ΢βදࣔ 0#4
   7JSUVBM$BN ֤छπʔϧʹදࣔ

9. σϞ 9

10. ࣮૷ͨ͠΋ͷ • σϞαΠτ https://tfug-niigata-bodypix-demo.netlify.app/ • ιʔείʔυ https://github.com/kasacchiful/bodypix-sample 10

11. WebΧϝϥͷಈ ըΛऔಘ <div id='main' style='display:none'> <video id="video" playsinline style="display: none;"></video>

    <canvas id="output"></canvas> <img id="bg_img" src="./bg.jpg" style="display: none;"> </div> • videoλάΛඇදࣔʹͯ͠Χϝϥ ىಈ&ಈը࠶ੜ • canvasλάʹදࣔ͢Δ͜ͱͰɺ ͍ΖΜͳը૾Λඳ͚Δ • എܠը૾͸imgλάʹ࢓ࠐ·ͤͯ ͓͘ 11

12. ਓͷηάϝϯ ςʔγϣϯ async function estimateSegmentation() { return await state.net.segmentPerson(state.video, {

    internalResolution: segmentationOption.internalResolution, segmentationThreshold: segmentationOption.segmentationThreshold, maxDetections: segmentationOption.multiDecodingMaxDetections, scoreThreshold: segmentationOption.multiDecodingScoreThreshold, nmsRadius: segmentationOption.multiDecodingNmsRadius, }); } function segmentBodyInRealTime() { const canvas = document.getElementById('output'); const img = document.getElementById('bg_img'); async function bodySegmentationFrame() { // segmentation const personSegmentation = await estimateSegmentation(); toMaskImage(canvas, personSegmentation, state.video, img); requestAnimationFrame(bodySegmentationFrame); } bodySegmentationFrame(); } • segmentPerson()Ͱηάϝ ϯςʔγϣϯऔಘ • ֤ϐΫηϧʹɺਓͳΒ”1” ਓҎ֎ͳΒ”0”͕෇༩͞Ε Δ 12

13. Χϝϥը૾ͱഎ ܠը૾ͷ߹੒ function toMaskImage(canvas, segmentation, video, img) { // লུ…

    // ඳը const ctx = canvas.getContext('2d'); let ctxImageData = ctx.getImageData(0, 0, canvas.width, canvas.height); let bytes = ctxImageData.data; for (let i = 0; i < canvas.height; i++) { for (let j = 0; j < canvas.width; j++) { const n = i * canvas.width + j; if (segmentation.data[n] === 1) { // for foreground (ਓ) bytes[4 * n + 0] = fgImg.data[4 * n + 0]; bytes[4 * n + 1] = fgImg.data[4 * n + 1]; bytes[4 * n + 2] = fgImg.data[4 * n + 2]; bytes[4 * n + 3] = fgImg.data[4 * n + 3]; } else { // for background (എܠ) bytes[4 * n + 0] = bgImg.data[4 * n + 0]; bytes[4 * n + 1] = bgImg.data[4 * n + 1]; bytes[4 * n + 2] = bgImg.data[4 * n + 2]; bytes[4 * n + 3] = bgImg.data[4 * n + 3]; } } } ctx.putImageData(ctxImageData, 0, 0); } • ֤ϐΫηϧͷηάϝϯςʔγϣ ϯ൑ఆʹԠͯ͡ɺΧϝϥը૾͔ എܠը૾Λcanvasʹॻ͖ࠐΉ • BodyPixͷtoMask()Ͱ΋ಉ͡Α ͏ͳख๏Ͱߦ͍ͬͯͨͷͰ࠾༻ 13 IUUQTHJUIVCDPNUFOTPSqPXUGKTNPEFMTCMPCNBTUFSCPEZQJYTSDPVUQVU@SFOEFSJOH@VUJMUT--

14. OBS VirtualCam • OBS͸ಈը഑৴ͷࡍʹ֤छฤू͕Ͱ͖Δɺແྉͷπʔϧ • OBS VirtualCam͸OBSͷϓϥάΠϯͱͯ͠ΠϯετʔϧͰ͖Δ • ࠓճ͸ϒϥ΢βΛೖྗιʔεͱͯ͠OBSʹऔΓࠐΈɺදࣔαΠζΛద ٓमਖ਼ͯ͠ɺOBS

    VirtualCamͷԾ૝Χϝϥʹೖྗιʔεͱͯ͠ઃఆ • OBS VirtualCam͸Χϝϥͷ1ͭͱͯ͠ೝࣝ͞ΕΔͷͰɺZoom΍ Google Meet౳ͷೖྗΧϝϥͱͯ͠ઃఆͰ͖Δ 14

15. ՝୊ • ը૾ͷ੾Γସ͑ػೳͳ͠ ʗ Χϝϥͷ੾Γସ͑ػೳͳ͠ • ࠨӈ൓సͰ͖ͳ͍ • canvasΛࠨӈ൓సͤ͞Ε͹ɺഎܠ͝ͱ൓సͰ͖ͦ͏ •

    CPUύϫʔ͕ඞཁ • ಛʹOBS VirtualCamΛซ༻͢ΔͱɺCPUϑΝϯ͕ᄬΔ • OBS VirtualCamͷઃఆ͕໘౗ • Chrome Extension౳Ͱ࡞ͬͯ΋͍͍͔΋ 15

16. ·ͱΊ • TensorFlow.js ͱ BodyPix ϞσϧͰ؆୯ʹ࣮૷Ͱ͖ͨ • PoseNetͱ૊Έ߹ΘͤΔͱɺΑΓ໘ന͍͔΋ • ՆٳΈͷࣗ༝ݚڀωλͱͯ͠΋ɺ͓࢖͍͍ͩ͘͞

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17. એ఻ 17

18. JAWS SONIC 2020 & MIDNIGHT JAWS 2020 JAWS-UGͷ24hΦϯϥΠϯΠϕϯτ 9/12(౔) 16:50

    - 9/13(೔) 17:20 JAWS-UG৽ׁ࿮Ͱ஻Δ͔΋ IUUQTKBXTTPOJDKBXTVHKQ 18

19. JaSST’20 Niigata ιϑτ΢ΣΞςετγϯϙδ΢Ϝ ΦϯϥΠϯ։࠵ 9/28(݄) 13:00 - 17:00 (༧ఆ) ςʔϚ:

    ςετࣗಈԽ IUUQKBTTUKQTZNQPTJVNKBTTUOJJHBUBIUNM 19

20. ͓ΘΓ 20

21. ࣮૷ͨ͠΋ͷʢ࠶ܝʣ • σϞαΠτ https://tfug-niigata-bodypix-demo.netlify.app/ • ιʔείʔυ https://github.com/kasacchiful/bodypix-sample 21

22. ࢀߟ • https://developers-jp.googleblog.com/2019/04/bodypix- tensorflowjs.html • https://github.com/tensorflow/tfjs-models/tree/master/body-pix • https://note.com/prty/n/ne2d2090148dc 22