Created
October 29, 2018 12:33
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TensorFlow.js CNN Background Removal
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| <html> | |
| <head> | |
| <body onload="onLoad()"> | |
| <div id="container"> | |
| <div id="show-background">Show background as magenta<input id="show-background-toggle" type="checkbox" checked></div> | |
| <canvas id="canvas" width=640px height=480px></canvas> | |
| </div> | |
| </body> | |
| </head> | |
| <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs@0.13.2"> </script> | |
| <script> | |
| async function onLoad() { | |
| const MODEL_URL = 'deeplabv3_mnv2_pascal_train_aug_web_model/tensorflowjs_model.pb'; | |
| const WEIGHTS_URL = 'deeplabv3_mnv2_pascal_train_aug_web_model/weights_manifest.json'; | |
| // Model's input and output have width and height of 513. | |
| const TENSOR_EDGE = 513; | |
| const [model, stream] = await Promise.all([ | |
| tf.loadFrozenModel(MODEL_URL, WEIGHTS_URL), | |
| navigator.mediaDevices.getUserMedia({video: {facingMode: 'user', | |
| frameRate: 30, width : 640, height:480}})]); | |
| const video = document.createElement('video'); | |
| video.autoplay = true; | |
| video.width = video.height = TENSOR_EDGE; | |
| const ctx = document.getElementById("canvas").getContext("2d"); | |
| const videoCopy = ctx.canvas.cloneNode(false).getContext("2d"); | |
| const maskContext = document.createElement('canvas').getContext("2d"); | |
| maskContext.canvas.width = maskContext.canvas.height = TENSOR_EDGE; | |
| const img = maskContext.createImageData(TENSOR_EDGE, TENSOR_EDGE); | |
| let imgd = img.data; | |
| new Uint32Array(imgd.buffer).fill(0x00FFFF00); | |
| const render = () => { | |
| const t1 = performance.now(); | |
| videoCopy.drawImage(video, 0, 0, ctx.canvas.width, ctx.canvas.height); | |
| const out = tf.tidy(() => { | |
| return model.execute({'ImageTensor': tf.fromPixels(video).expandDims(0)}); | |
| }); | |
| const t2 = performance.now(); | |
| const data = out.dataSync(); | |
| const t3 = performance.now(); | |
| for (let i = 0; i < data.length; i++) { | |
| imgd[i * 4 + 3] = data[i] == 15 ? 0 : 255; | |
| } | |
| maskContext.putImageData(img, 0, 0); | |
| ctx.drawImage(videoCopy.canvas, 0, 0); | |
| if (document.getElementById("show-background-toggle").checked) | |
| ctx.drawImage(maskContext.canvas, 0, 0, ctx.canvas.width, ctx.canvas.height); | |
| console.log("model.execute took " + (t2 - t1) + "ms, read data took " + (t3 - t2) + "ms, draw: " + (performance.now() - t3) + "ms."); | |
| window.requestAnimationFrame(render); | |
| } | |
| video.oncanplay = render; | |
| video.srcObject = stream; | |
| } | |
| </script> | |
| <style type="text/css"> | |
| #container { | |
| position: relative; | |
| display: inline-block; | |
| } | |
| #show-background { | |
| position: absolute; | |
| bottom: 20px; | |
| right: 20px; | |
| color: gray; | |
| z-index: 5; | |
| height: 20px; | |
| text-align: right; | |
| display:block; | |
| } | |
| #show-background-toggle { | |
| height: 15px !important; | |
| vertical-align:middle; | |
| } | |
| </style> | |
| </html> | |
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from where to download deeplabv3_mnv2_pascal_train_aug_web_model/tensorflowjs_model.pb and deeplabv3_mnv2_pascal_train_aug_web_model/weights_manifest.json