face-api.js
Version:
JavaScript API for face detection and face recognition in the browser with tensorflow.js
56 lines • 3.03 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var tf = require("@tensorflow/tfjs-core");
var dom_1 = require("../dom");
var env_1 = require("../env");
var normalize_1 = require("./normalize");
function extractImagePatches(img, boxes, _a) {
var width = _a.width, height = _a.height;
return tslib_1.__awaiter(this, void 0, void 0, function () {
var imgCtx, bitmaps, imagePatchesDatas;
var _this = this;
return tslib_1.__generator(this, function (_b) {
switch (_b.label) {
case 0:
imgCtx = dom_1.getContext2dOrThrow(img);
return [4 /*yield*/, Promise.all(boxes.map(function (box) { return tslib_1.__awaiter(_this, void 0, void 0, function () {
var _a, y, ey, x, ex, fromX, fromY, imgData;
return tslib_1.__generator(this, function (_b) {
_a = box.padAtBorders(img.height, img.width), y = _a.y, ey = _a.ey, x = _a.x, ex = _a.ex;
fromX = x - 1;
fromY = y - 1;
imgData = imgCtx.getImageData(fromX, fromY, (ex - fromX), (ey - fromY));
return [2 /*return*/, env_1.env.isNodejs() ? dom_1.createCanvasFromMedia(imgData) : createImageBitmap(imgData)];
});
}); }))];
case 1:
bitmaps = _b.sent();
imagePatchesDatas = [];
bitmaps.forEach(function (bmp) {
var patch = dom_1.createCanvas({ width: width, height: height });
var patchCtx = dom_1.getContext2dOrThrow(patch);
patchCtx.drawImage(bmp, 0, 0, width, height);
var data = patchCtx.getImageData(0, 0, width, height).data;
var currData = [];
// RGBA -> BGR
for (var i = 0; i < data.length; i += 4) {
currData.push(data[i + 2]);
currData.push(data[i + 1]);
currData.push(data[i]);
}
imagePatchesDatas.push(currData);
});
return [2 /*return*/, imagePatchesDatas.map(function (data) {
var t = tf.tidy(function () {
var imagePatchTensor = tf.transpose(tf.tensor4d(data, [1, width, height, 3]), [0, 2, 1, 3]).toFloat();
return normalize_1.normalize(imagePatchTensor);
});
return t;
})];
}
});
});
}
exports.extractImagePatches = extractImagePatches;
//# sourceMappingURL=extractImagePatches.js.map