index.js

import { pipeline, env } from "https://cdn.jsdelivr.net/npm/@xenova/transformers@2.6.0";

env.allowLocalModels = false;

const fileUpload = document.getElementById("file-upload");
const imageContainer = document.getElementById("image-container");
const status = document.getElementById("status");

status.textContent = "Loading model...";
const detector = await pipeline("object-detection", "Xenova/detr-resnet-50");
status.textContent = "Ready";

fileUpload.addEventListener("change", function (e) {
    const file = e.target.files[0];
    if (!file) {
        return;
    }

    const reader = new FileReader;

    // set up a callback when the file is loaded
    reader.onload = function (e2) {
        imageContainer.innerHTML = "";
        const image = document.createElement("img");
        image.src = e2.target.result;
        imageContainer.appendChild(image);
        detect(image);
    };
    reader.readAsDataURL(file);
});

async function detect(img) {
    status.textContent = "Analyzing...";
    const output = await detector(img.src, {
        threshold: 0.5,
        percentage: true,
    });
    status.textContent = "";
    console.log("output", output);
    output.forEach(renderBox);
}

// render a bounding box and label on the image
function renderBox({ box, label }) {
    const { xmax, xmin, ymax, ymin } = box;
    console.log(xmax);

    // generage a random color for the box
    const color = "#" + Math.floor(Math.random() * 0xFFFFFF).toString(16).padStart(6, 0);
    console.log(color);

    // draw the box
    const boxElement = document.createElement("div");
    boxElement.className = "bounding-box";
    Object.assign(boxElement.style, {
        borderColor: color,
        left: 100 * xmin + "%",
        top: 100 * ymin + "%",
        width: 100 * (xmax - xmin) + "%",
        height: 100 * (ymax - ymin) + "%",
    });

    // draw the label
    const labelElement = document.createElement("span");
    labelElement.textContent = label;
    labelElement.className = "bounding-box-label";
    labelElement.style.backgroundColor = color;

    boxElement.appendChild(labelElement);
    imageContainer.appendChild(boxElement);
}