mirror of https://github.com/vladmandic/human
113 lines
4.3 KiB
TypeScript
113 lines
4.3 KiB
TypeScript
/**
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* EfficientPose model implementation
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*
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* Based on: [**BecauseofAI MobileFace**](https://github.com/becauseofAI/MobileFace)
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*
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* Obsolete and replaced by `faceres` that performs age/gender/descriptor analysis
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*/
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import { log, join } from '../util/util';
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import * as tf from '../../dist/tfjs.esm.js';
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import type { Tensor, GraphModel } from '../tfjs/types';
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import { env } from '../util/env';
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let model: GraphModel | null;
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export async function load(config) {
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const modelUrl = join(config.modelBasePath, config.face.embedding.modelPath);
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if (env.initial) model = null;
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if (!model) {
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model = await tf.loadGraphModel(modelUrl) as unknown as GraphModel;
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if (!model) log('load model failed:', config.face.embedding.modelPath);
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else if (config.debug) log('load model:', modelUrl);
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} else if (config.debug) log('cached model:', modelUrl);
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return model;
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}
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export function enhance(input): Tensor {
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const image = tf.tidy(() => {
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// input received from detector is already normalized to 0..1
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// input is also assumed to be straightened
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// const data = tf.image.resizeBilinear(input, [model.inputs[0].shape[2], model.inputs[0].shape[1]], false); // just resize to fit the embedding model
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// do a tight crop of image and resize it to fit the model
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const box = [[0.05, 0.15, 0.85, 0.85]]; // empyrical values for top, left, bottom, right
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const tensor = input.image || input.tensor;
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if (!(tensor instanceof tf.Tensor)) return null;
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if (!model || !model.inputs || !model.inputs[0].shape) return null;
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const crop = (tensor.shape.length === 3)
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? tf.image.cropAndResize(tf.expandDims(tensor, 0), box, [0], [model.inputs[0].shape[2], model.inputs[0].shape[1]]) // add batch dimension if missing
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: tf.image.cropAndResize(tensor, box, [0], [model.inputs[0].shape[2], model.inputs[0].shape[1]]);
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// convert to black&white to avoid colorization impact
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const rgb = [0.2989, 0.5870, 0.1140]; // factors for red/green/blue colors when converting to grayscale: https://www.mathworks.com/help/matlab/ref/rgb2gray.html
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const [red, green, blue] = tf.split(crop, 3, 3);
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const redNorm = tf.mul(red, rgb[0]);
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const greenNorm = tf.mul(green, rgb[1]);
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const blueNorm = tf.mul(blue, rgb[2]);
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const grayscale = tf.addN([redNorm, greenNorm, blueNorm]);
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const merge = tf.stack([grayscale, grayscale, grayscale], 3).squeeze(4);
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/*
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// optional increase image contrast
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// or do it per-channel so mean is done on each channel
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// or do it based on histogram
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const mean = merge.mean();
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const factor = 5;
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const contrast = merge.sub(mean).mul(factor).add(mean);
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*/
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// normalize brightness from 0..1
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const darken = tf.sub(merge, merge.min());
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const lighten = tf.div(darken, darken.max());
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return lighten;
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});
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return image;
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}
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export async function predict(input, config): Promise<number[]> {
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if (!model) return [];
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return new Promise(async (resolve) => {
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// let data: Array<[]> = [];
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let data: Array<number> = [];
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if (config.face.embedding.enabled) {
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const image = enhance(input);
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const dataT = model?.execute(image) as Tensor;
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/*
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const dataT = tf.tidy(() => {
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/*
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// if needed convert from NHWC to NCHW
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const nchw = image.transpose([3, 0, 1, 2]);
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const res = model.execute(image);
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// optionally do it twice with flipped image and average results
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const res1 = model.execute(image);
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const flipped = tf.image.flipLeftRight(image);
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const res2 = model.execute(flipped);
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const merge = tf.stack([res1, res2], 2).squeeze();
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const res = reshape.logSumExp(1);
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// optional normalize outputs with l2 normalization
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const scaled = tf.tidy(() => {
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const l2 = res.norm('euclidean');
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const scale = res.div(l2);
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return scale;
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});
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// optional reduce feature vector complexity
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const reshape = tf.reshape(res, [128, 2]); // split 256 vectors into 128 x 2
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const reduce = reshape.logSumExp(1); // reduce 2nd dimension by calculating logSumExp on it
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return reduce;
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});
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*/
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const output = await dataT.data();
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data = Array.from(output); // convert typed array to simple array
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tf.dispose(dataT);
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tf.dispose(image);
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}
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resolve(data);
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});
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}
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