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gemini-bbox.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Gemini API Image Bounding Box Visualization</title>
<script type="module">
import { GoogleGenerativeAI } from "https://esm.run/@google/generative-ai";
import { marked } from "https://esm.run/marked";
function getApiKey() {
let apiKey = localStorage.getItem("GEMINI_API_KEY");
if (!apiKey) {
apiKey = prompt("Please enter your Gemini API key:");
if (apiKey) {
localStorage.setItem("GEMINI_API_KEY", apiKey);
}
}
return apiKey;
}
async function getGenerativeModel(params) {
const API_KEY = getApiKey();
const genAI = new GoogleGenerativeAI(API_KEY);
return genAI.getGenerativeModel(params);
}
async function fileToGenerativePart(file) {
return new Promise((resolve) => {
const reader = new FileReader();
reader.onloadend = () => resolve({
inlineData: {
data: reader.result.split(",")[1],
mimeType: file.type
}
});
reader.readAsDataURL(file);
});
}
function resizeAndCompressImage(file) {
return new Promise((resolve) => {
const reader = new FileReader();
reader.onload = function(event) {
const img = new Image();
img.onload = function() {
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
let width = img.width;
let height = img.height;
if (width > 1000) {
height = Math.round((height * 1000) / width);
width = 1000;
}
canvas.width = width;
canvas.height = height;
ctx.drawImage(img, 0, 0, width, height);
canvas.toBlob((blob) => {
resolve(new File([blob], "compressed_image.jpg", { type: "image/jpeg" }));
}, 'image/jpeg', 0.7);
};
img.src = event.target.result;
};
reader.readAsDataURL(file);
});
}
async function processImageAndPrompt() {
const fileInput = document.getElementById('imageInput');
const promptInput = document.getElementById('promptInput');
const resultDiv = document.getElementById('result');
const modelSelect = document.getElementById('modelSelect');
if (!promptInput.value) {
alert('Please enter a prompt.');
return;
}
resultDiv.innerHTML = 'Processing...';
// Clear previous bounding box images
document.getElementById('boundingBoxImages').innerHTML = '';
try {
const model = await getGenerativeModel({ model: modelSelect.value });
let content = [promptInput.value];
if (fileInput.files[0]) {
const compressedImage = await resizeAndCompressImage(fileInput.files[0]);
const imagePart = await fileToGenerativePart(compressedImage);
content.push(imagePart);
}
const result = await model.generateContent(content);
const response = await result.response;
const text = response.text();
resultDiv.innerHTML = marked.parse(text);
if (fileInput.files[0]) {
// Extract coordinates from the response
const coordinates = extractCoordinates(text);
if (coordinates.length > 0) {
displayImageWithBoundingBoxes(fileInput.files[0], coordinates);
}
}
} catch (error) {
resultDiv.innerHTML = `Error: ${error.message}`;
}
}
function extractCoordinates(text) {
const regex = /\[\s*\d+\s*,\s*\d+\s*,\s*\d+\s*,\s*\d+\s*\]/g;
const matches = text.match(regex) || [];
return matches.map(JSON.parse);
}
function displayImageWithBoundingBoxes(file, coordinates) {
const reader = new FileReader();
reader.onload = function(event) {
const image = new Image();
image.onload = function() {
const canvas = document.getElementById('canvas');
canvas.width = image.width + 100;
canvas.height = image.height + 100;
const ctx = canvas.getContext('2d');
// Draw the image
ctx.drawImage(image, 80, 20);
// Draw grid lines
ctx.strokeStyle = 'rgba(255, 0, 0, 0.5)'; // Red with 50% opacity
ctx.lineWidth = 1;
// Vertical grid lines
for (let i = 0; i <= 1000; i += 100) {
const x = 80 + i / 1000 * image.width;
ctx.beginPath();
ctx.moveTo(x, 20);
ctx.lineTo(x, image.height + 20);
ctx.stroke();
}
// Horizontal grid lines
for (let i = 0; i <= 1000; i += 100) {
const y = 20 + (1000 - i) / 1000 * image.height;
ctx.beginPath();
ctx.moveTo(80, y);
ctx.lineTo(image.width + 80, y);
ctx.stroke();
}
// Draw bounding boxes
const colors = ['#FF0000', '#00FF00', '#0000FF', '#FFFF00', '#FF00FF', '#00FFFF'];
const boundingBoxImages = document.getElementById('boundingBoxImages');
boundingBoxImages.innerHTML = ''; // Clear previous bounding box images
coordinates.forEach((box, index) => {
const [ymin, xmin, ymax, xmax] = box.map(coord => coord / 1000);
const width = (xmax - xmin) * image.width;
const height = (ymax - ymin) * image.height;
ctx.strokeStyle = colors[index % colors.length];
ctx.lineWidth = 5;
ctx.strokeRect(xmin * image.width + 80, ymin * image.height + 20, width, height);
// Extract bounding box image
const boundingBoxCanvas = document.createElement('canvas');
boundingBoxCanvas.width = width;
boundingBoxCanvas.height = height;
const bbCtx = boundingBoxCanvas.getContext('2d');
bbCtx.drawImage(image, xmin * image.width, ymin * image.height, width, height, 0, 0, width, height);
// Convert canvas to JPEG base64 data URI
const dataURI = boundingBoxCanvas.toDataURL('image/jpeg');
const boundingBoxContainer = document.createElement('div');
boundingBoxContainer.className = 'bounding-box-container';
const title = document.createElement('p');
title.textContent = `Bounding Box: [${box.join(', ')}]`;
boundingBoxContainer.appendChild(title);
const img = document.createElement('img');
img.src = dataURI;
boundingBoxContainer.appendChild(img);
boundingBoxImages.appendChild(boundingBoxContainer);
});
// Draw axes and labels
ctx.strokeStyle = '#000000';
ctx.lineWidth = 1;
ctx.font = '26px Arial';
ctx.textAlign = 'right';
// Y-axis
ctx.beginPath();
ctx.moveTo(80, 20);
ctx.lineTo(80, image.height + 20);
ctx.stroke();
// Y-axis labels and ticks
for (let i = 0; i <= 1000; i += 100) {
const y = 20 + i / 1000 * image.height;
ctx.fillText(i.toString(), 75, y + 5);
ctx.beginPath();
ctx.moveTo(75, y);
ctx.lineTo(80, y);
ctx.stroke();
}
// X-axis
ctx.beginPath();
ctx.moveTo(80, image.height + 20);
ctx.lineTo(image.width + 80, image.height + 20);
ctx.stroke();
// X-axis labels and ticks
ctx.textAlign = 'center';
for (let i = 0; i <= 1000; i += 100) {
const x = 80 + i / 1000 * image.width;
ctx.fillText(i.toString(), x, image.height + 40);
ctx.beginPath();
ctx.moveTo(x, image.height + 20);
ctx.lineTo(x, image.height + 25);
ctx.stroke();
}
};
image.src = event.target.result;
};
reader.readAsDataURL(file);
}
function clearImage() {
document.getElementById('imageInput').value = '';
document.getElementById('canvas').getContext('2d').clearRect(0, 0, canvas.width, canvas.height);
document.getElementById('imagePreview').src = '';
document.getElementById('imagePreview').style.display = 'none';
document.getElementById('boundingBoxImages').innerHTML = '';
}
function previewImage(event) {
const file = event.target.files[0];
if (file) {
const reader = new FileReader();
reader.onload = function(e) {
const img = document.getElementById('imagePreview');
img.src = e.target.result;
img.style.display = 'block';
}
reader.readAsDataURL(file);
}
}
// Attach event listeners
document.getElementById('submitBtn').addEventListener('click', processImageAndPrompt);
document.getElementById('clearImageBtn').addEventListener('click', clearImage);
document.getElementById('imageInput').addEventListener('change', previewImage);
</script>
<style>
body {
font-family: Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
textarea {
width: 100%;
height: 100px;
}
#result, #imageContainer {
margin-top: 20px;
border: 1px solid #ccc;
padding: 10px;
}
#canvas {
max-width: 100%;
height: auto;
}
#imagePreview {
max-width: 100%;
display: none;
margin-top: 10px;
}
#boundingBoxImages {
margin-top: 20px;
}
#boundingBoxImages img {
max-width: 100%;
}
.bounding-box-container {
display: block;
margin-bottom: 20px;
}
.bounding-box-container p {
margin: 0 0 5px 0;
font-weight: bold;
}
.bounding-box-container img {
display: block;
border: 1px solid #ccc;
}
</style>
</head>
<body>
<h1>Gemini API Image Bounding Box Visualization</h1>
<select id="modelSelect">
<option value="gemini-2.0-flash">gemini-2.0-flash</option>
<option value="gemini-2.0-flash-lite-preview-02-05">gemini-2.0-flash-lite-preview-02-05</option>
<option value="gemini-2.0-pro-exp-02-05">gemini-2.0-pro-exp-02-05</option>
<option value="gemini-1.5-pro-latest">gemini-1.5-pro</option>
<option value="gemini-1.5-flash-latest">gemini-1.5-flash</option>
<option value="gemini-1.5-flash-8b-latest">gemini-1.5-flash-8b</option>
<option value="gemini-2.0-pro-exp-01-28">gemini-2.0-pro-exp-01-28</option>
</select>
<input type="file" id="imageInput" accept="image/*">
<button id="clearImageBtn">Clear Image</button>
<textarea id="promptInput">Return bounding boxes as JSON arrays [ymin, xmin, ymax, xmax]
</textarea>
<button id="submitBtn">Process</button>
<div id="result"></div>
<div id="imageContainer">
<img id="imagePreview" alt="Image preview" />
<canvas id="canvas"></canvas>
</div>
<div id="boundingBoxImages"></div>
</body>
</html>