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/**
* Image Utilities - Helper functions for image manipulation
*/
import { DETECTION_CONFIG } from '../config.js';
/**
* Load image from data URL or path
*/
export function loadImage(src) {
return new Promise((resolve, reject) => {
const img = new Image();
img.crossOrigin = 'anonymous';
img.onload = () => resolve(img);
img.onerror = reject;
img.src = src;
});
}
/**
* Crop image region with optional padding
*/
export async function cropImage(img, x1, y1, x2, y2, padding = DETECTION_CONFIG.yolo.padding) {
const width = x2 - x1;
const height = y2 - y1;
const padX = width * padding;
const padY = height * padding;
x1 = Math.max(0, x1 - padX);
y1 = Math.max(0, y1 - padY);
x2 = Math.min(img.width, x2 + padX);
y2 = Math.min(img.height, y2 + padY);
const canvas = document.createElement('canvas');
canvas.width = x2 - x1;
canvas.height = y2 - y1;
const ctx = canvas.getContext('2d');
ctx.drawImage(img, x1, y1, x2 - x1, y2 - y1, 0, 0, x2 - x1, y2 - y1);
return canvas.toDataURL();
}
/**
* Read file as data URL
*/
export function readFileAsDataURL(file) {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = (e) => resolve(e.target.result);
reader.onerror = reject;
reader.readAsDataURL(file);
});
}
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