add detect image

components.d.ts

@@ -10,8 +10,10 @@ declare module 'vue' {
     RouterLink: typeof import('vue-router')['RouterLink']
     RouterView: typeof import('vue-router')['RouterView']
     TabBar: typeof import('./src/components/TabBar.vue')['default']
+    VanButton: typeof import('vant/es')['Button']
     VanTabbar: typeof import('vant/es')['Tabbar']
     VanTabbarItem: typeof import('vant/es')['TabbarItem']
     VanToast: typeof import('vant/es')['Toast']
+    VanUploader: typeof import('vant/es')['Uploader']
   }
 }

src/i18n/zhCN.ts

@@ -1,12 +1,13 @@
 export default {
   zhCN: {
     _tabbar: {
-      image: '图像',
+      image: '图片',
       video: '视频',
       webcam: '摄像'
     },
-    image: '图像',
+    image: '图片',
     video: '视频',
-    webcam: '摄像'
+    webcam: '摄像',
+    'Open Image': '打开图片'
   }
 }

src/stores/yolo.ts

@@ -3,10 +3,10 @@ import { defineStore } from 'pinia'
 import type { GraphModel, io } from '@tensorflow/tfjs'
 
 export default defineStore('yolo', () => {
-  const name = ref('yolov8n')
-  const net = ref<GraphModel<string | io.IOHandler> | null>()
+  const version = ref('yolov8n')
+  const model = ref<GraphModel<string | io.IOHandler>>()
   const inputShape = ref([1, 0, 0, 3])
   const loading = ref(0)
 
-  return { name, net, inputShape, loading }
+  return { version, model, inputShape, loading }
 })

src/styles/theme.less

@@ -59,15 +59,32 @@ body {
   width: 50%;
 }
 
+.w-full {
+  width: 100%;
+}
+
+/* width */
+.h-full {
+  height: 100%;
+}
+
 /* display */
 .flex {
   display: flex
 }
 
-.space-around {
+.justify-center {
+  justify-content: center;
+}
+
+.justify-around {
   justify-content: space-around;
 }
 
+.items-center {
+  align-items: center;
+}
+
 /* position */
 .absolute {
   position: absolute;

src/utils/labels.json

@@ -0,0 +1,82 @@
+[
+    "person",
+    "bicycle",
+    "car",
+    "motorcycle",
+    "airplane",
+    "bus",
+    "train",
+    "truck",
+    "boat",
+    "traffic light",
+    "fire hydrant",
+    "stop sign",
+    "parking meter",
+    "bench",
+    "bird",
+    "cat",
+    "dog",
+    "horse",
+    "sheep",
+    "cow",
+    "elephant",
+    "bear",
+    "zebra",
+    "giraffe",
+    "backpack",
+    "umbrella",
+    "handbag",
+    "tie",
+    "suitcase",
+    "frisbee",
+    "skis",
+    "snowboard",
+    "sports ball",
+    "kite",
+    "baseball bat",
+    "baseball glove",
+    "skateboard",
+    "surfboard",
+    "tennis racket",
+    "bottle",
+    "wine glass",
+    "cup",
+    "fork",
+    "knife",
+    "spoon",
+    "bowl",
+    "banana",
+    "apple",
+    "sandwich",
+    "orange",
+    "broccoli",
+    "carrot",
+    "hot dog",
+    "pizza",
+    "donut",
+    "cake",
+    "chair",
+    "couch",
+    "potted plant",
+    "bed",
+    "dining table",
+    "toilet",
+    "tv",
+    "laptop",
+    "mouse",
+    "remote",
+    "keyboard",
+    "cell phone",
+    "microwave",
+    "oven",
+    "toaster",
+    "sink",
+    "refrigerator",
+    "book",
+    "clock",
+    "vase",
+    "scissors",
+    "teddy bear",
+    "hair drier",
+    "toothbrush"
+  ]

src/utils/renderBox.ts

@@ -0,0 +1,107 @@
+import labels from './labels.json'
+
+/**
+ * Render prediction boxes
+ * @param {HTMLCanvasElement} canvasRef canvas tag reference
+ * @param {Array} boxes_data boxes array
+ * @param {Array} scores_data scores array
+ * @param {Array} classes_data class array
+ * @param {Array[Number]} ratios boxes ratio [xRatio, yRatio]
+ */
+export function renderBoxes(
+  canvasRef: HTMLCanvasElement,
+  boxes_data: Float32Array | Int32Array | Uint8Array,
+  scores_data: Float32Array | Int32Array | Uint8Array,
+  classes_data: Float32Array | Int32Array | Uint8Array,
+  ratios: any[]
+) {
+  const ctx = canvasRef.getContext('2d')
+  if (ctx) {
+    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height) // clean canvas
+
+    const colors = new Colors()
+
+    // font configs
+    const font = `${Math.max(Math.round(Math.max(ctx.canvas.width, ctx.canvas.height) / 40), 14)}px Arial`
+    ctx.font = font
+    ctx.textBaseline = 'top'
+
+    for (let i = 0; i < scores_data.length; ++i) {
+      // filter based on class threshold
+      const klass = labels[classes_data[i]]
+      const color = colors.get(classes_data[i])
+      const score = (scores_data[i] * 100).toFixed(1)
+
+      let [y1, x1, y2, x2] = boxes_data.slice(i * 4, (i + 1) * 4)
+      x1 *= ratios[0]
+      x2 *= ratios[0]
+      y1 *= ratios[1]
+      y2 *= ratios[1]
+      const width = x2 - x1
+      const height = y2 - y1
+
+      // draw box.
+      ctx.fillStyle = Colors.hexToRgba(color, 0.2)!
+      ctx.fillRect(x1, y1, width, height)
+
+      // draw border box.
+      ctx.strokeStyle = color
+      ctx.lineWidth = Math.max(Math.min(ctx.canvas.width, ctx.canvas.height) / 200, 2.5)
+      ctx.strokeRect(x1, y1, width, height)
+
+      // Draw the label background.
+      ctx.fillStyle = color
+      const textWidth = ctx.measureText(`${klass} - ${score}%`).width
+      const textHeight = parseInt(font, 10) // base 10
+      const yText = y1 - (textHeight + ctx.lineWidth)
+      ctx.fillRect(
+        x1 - 1,
+        yText < 0 ? 0 : yText, // handle overflow label box
+        textWidth + ctx.lineWidth,
+        textHeight + ctx.lineWidth
+      )
+
+      // Draw labels
+      ctx.fillStyle = '#ffffff'
+      ctx.fillText(`${klass} - ${score}%`, x1 - 1, yText < 0 ? 0 : yText)
+    }
+  }
+}
+
+class Colors {
+  palette: string[]
+  n: number
+  // ultralytics color palette https://ultralytics.com/
+  constructor() {
+    this.palette = [
+      '#FF3838',
+      '#FF9D97',
+      '#FF701F',
+      '#FFB21D',
+      '#CFD231',
+      '#48F90A',
+      '#92CC17',
+      '#3DDB86',
+      '#1A9334',
+      '#00D4BB',
+      '#2C99A8',
+      '#00C2FF',
+      '#344593',
+      '#6473FF',
+      '#0018EC',
+      '#8438FF',
+      '#520085',
+      '#CB38FF',
+      '#FF95C8',
+      '#FF37C7'
+    ]
+    this.n = this.palette.length
+  }
+
+  get = (i: number) => this.palette[Math.floor(i) % this.n]
+
+  static hexToRgba = (hex: string, alpha: number) => {
+    const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
+    return result ? `rgba(${[parseInt(result[1], 16), parseInt(result[2], 16), parseInt(result[3], 16)].join(', ')}, ${alpha})` : null
+  }
+}

src/utils/tf.ts

@@ -1,10 +1,16 @@
+import type { GraphModel, io, Rank, Tensor, Tensor1D, Tensor2D, Tensor3D } from '@tensorflow/tfjs'
 import * as tf from '@tensorflow/tfjs'
 import '@tensorflow/tfjs-backend-webgl'
 import { yolo } from '@/vue-pinia'
 
+import { renderBoxes } from '@/utils/renderBox'
+import labels from '@/utils/labels.json'
+
+const numClass = labels.length
+
 export function loadModel() {
   tf.ready().then(async () => {
-    const model = await tf.loadGraphModel(`${process.env.VUE_APP_PUBLIC_PATH}${yolo().name}_web_model/model.json`, {
+    const model = await tf.loadGraphModel(`${process.env.VUE_APP_PUBLIC_PATH}${yolo().version}_web_model/model.json`, {
       onProgress: progress => {
         console.log('tf.loadGraphModel', progress)
         yolo().loading = progress
@@ -16,10 +22,105 @@ export function loadModel() {
       const dummyInput = tf.ones(model.inputs[0].shape)
       const warmupResults = model.execute(dummyInput)
 
-      yolo().net = model
+      yolo().model = model
       yolo().inputShape = model.inputs[0].shape
 
       tf.dispose([warmupResults, dummyInput]) // cleanup memory
     }
   })
 }
+
+/**
+ * Preprocess image / frame before forwarded into the model
+ * @param {HTMLVideoElement|HTMLImageElement} source
+ * @param {Number} modelWidth
+ * @param {Number} modelHeight
+ * @returns input tensor, xRatio and yRatio
+ */
+function preprocess(source: HTMLVideoElement | HTMLImageElement, modelWidth: number, modelHeight: number): [Tensor, number, number] {
+  // ratios for boxes
+  let xRatio = 0
+  let yRatio = 0
+
+  const input = tf.tidy(() => {
+    const img = tf.browser.fromPixels(source)
+
+    // padding image to square => [n, m] to [n, n], n > m
+    const [h, w] = img.shape.slice(0, 2) // get source width and height
+    const maxSize = Math.max(w, h) // get max size
+    const imgPadded = img.pad([
+      [0, maxSize - h], // padding y [bottom only]
+      [0, maxSize - w], // padding x [right only]
+      [0, 0]
+    ]) as Tensor3D
+
+    xRatio = maxSize / w // update xRatio
+    yRatio = maxSize / h // update yRatio
+
+    return tf.image
+      .resizeBilinear(imgPadded, [modelWidth, modelHeight]) // resize frame
+      .div(255.0) // normalize
+      .expandDims(0) // add batch
+  })
+
+  return [input, xRatio, yRatio]
+}
+
+/**
+ * Function run inference and do detection from source.
+ * @param {HTMLImageElement|HTMLVideoElement} source
+ * @param {tf.GraphModel} model loaded YOLOv8 tensorflow.js model
+ * @param {HTMLCanvasElement} canvasRef canvas reference
+ * @param {VoidFunction} callback function to run after detection process
+ */
+export async function detect(
+  model: any,
+  inputShape: number[],
+  source: HTMLImageElement | HTMLVideoElement,
+  canvasRef: HTMLCanvasElement,
+  callback: () => void
+) {
+  tf.engine().startScope() // start scoping tf engine
+
+  const [modelWidth, modelHeight] = inputShape.slice(1, 3) // get model width and height
+  const [input, xRatio, yRatio] = preprocess(source, modelWidth, modelHeight) // preprocess image
+
+  const res = model.execute(input) as Tensor<Rank> // inference model
+  const transRes = res.transpose([0, 2, 1]) // transpose result [b, det, n] => [b, n, det]
+
+  const boxes = tf.tidy(() => {
+    const w = transRes.slice([0, 0, 2], [-1, -1, 1]) // get width
+    const h = transRes.slice([0, 0, 3], [-1, -1, 1]) // get height
+    const x1 = tf.sub(transRes.slice([0, 0, 0], [-1, -1, 1]), tf.div(w, 2)) // x1
+    const y1 = tf.sub(transRes.slice([0, 0, 1], [-1, -1, 1]), tf.div(h, 2)) // y1
+    return tf
+      .concat(
+        [
+          y1,
+          x1,
+          tf.add(y1, h), // y2
+          tf.add(x1, w) // x2
+        ],
+        2
+      )
+      .squeeze()
+  }) as Tensor2D // process boxes [y1, x1, y2, x2]
+
+  const [scores, classes] = tf.tidy(() => {
+    const rawScores = transRes.slice([0, 0, 4], [-1, -1, numClass]).squeeze() // #6 only squeeze axis 0 to handle only 1 class models
+    return [rawScores.max(1), rawScores.argMax(1)]
+  }) as [Tensor1D, Tensor2D] // get max scores and classes index
+
+  const nms = await tf.image.nonMaxSuppressionAsync(boxes, scores, 500, 0.45, 0.2) // NMS to filter boxes
+
+  const boxes_data = boxes.gather(nms, 0).dataSync() // indexing boxes by nms index
+  const scores_data = scores.gather(nms, 0).dataSync() // indexing scores by nms index
+  const classes_data = classes.gather(nms, 0).dataSync() // indexing classes by nms index
+
+  renderBoxes(canvasRef, boxes_data, scores_data, classes_data, [xRatio, yRatio]) // render boxes
+  tf.dispose([res, transRes, boxes, scores, classes, nms]) // clear memory
+
+  callback()
+
+  tf.engine().endScope() // end of scoping
+}