@tensorflow-models/body-pix/dist/blur.js

Pretrained BodyPix model in TensorFlow.js

"use strict";
/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.cpuBlur = void 0;
// method copied from bGlur in https://codepen.io/zhaojun/pen/zZmRQe
function cpuBlur(canvas, image, blur) {
    var ctx = canvas.getContext('2d');
    var sum = 0;
    var delta = 5;
    var alphaLeft = 1 / (2 * Math.PI * delta * delta);
    var step = blur < 3 ? 1 : 2;
    for (var y = -blur; y <= blur; y += step) {
        for (var x = -blur; x <= blur; x += step) {
            var weight = alphaLeft * Math.exp(-(x * x + y * y) / (2 * delta * delta));
            sum += weight;
        }
    }
    for (var y = -blur; y <= blur; y += step) {
        for (var x = -blur; x <= blur; x += step) {
            ctx.globalAlpha = alphaLeft *
                Math.exp(-(x * x + y * y) / (2 * delta * delta)) / sum * blur;
            ctx.drawImage(image, x, y);
        }
    }
    ctx.globalAlpha = 1;
}
exports.cpuBlur = cpuBlur;
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