mirror of https://github.com/vladmandic/human
87 lines
3.2 KiB
JavaScript
87 lines
3.2 KiB
JavaScript
/**
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* @license
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* Copyright 2020 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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import * as tf from '@tensorflow/tfjs/dist/tf.es2017.js';
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function getBoxSize(box) {
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return [
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Math.abs(box.endPoint[0] - box.startPoint[0]),
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Math.abs(box.endPoint[1] - box.startPoint[1]),
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];
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}
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function getBoxCenter(box) {
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return [
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box.startPoint[0] + (box.endPoint[0] - box.startPoint[0]) / 2,
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box.startPoint[1] + (box.endPoint[1] - box.startPoint[1]) / 2,
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];
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}
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function cutBoxFromImageAndResize(box, image, cropSize) {
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const h = image.shape[1];
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const w = image.shape[2];
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const boxes = [[
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box.startPoint[1] / h,
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box.startPoint[0] / w,
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box.endPoint[1] / h,
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box.endPoint[0] / w,
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]];
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return tf.image.cropAndResize(image, boxes, [0], cropSize);
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}
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function scaleBoxCoordinates(box, factor) {
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const startPoint = [box.startPoint[0] * factor[0], box.startPoint[1] * factor[1]];
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const endPoint = [box.endPoint[0] * factor[0], box.endPoint[1] * factor[1]];
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const palmLandmarks = box.palmLandmarks.map((coord) => {
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const scaledCoord = [coord[0] * factor[0], coord[1] * factor[1]];
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return scaledCoord;
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});
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return { startPoint, endPoint, palmLandmarks, confidence: box.confidence };
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}
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function enlargeBox(box, factor = 1.5) {
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const center = getBoxCenter(box);
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const size = getBoxSize(box);
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const newHalfSize = [factor * size[0] / 2, factor * size[1] / 2];
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const startPoint = [center[0] - newHalfSize[0], center[1] - newHalfSize[1]];
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const endPoint = [center[0] + newHalfSize[0], center[1] + newHalfSize[1]];
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return { startPoint, endPoint, palmLandmarks: box.palmLandmarks };
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}
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function squarifyBox(box) {
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const centers = getBoxCenter(box);
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const size = getBoxSize(box);
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const maxEdge = Math.max(...size);
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const halfSize = maxEdge / 2;
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const startPoint = [centers[0] - halfSize, centers[1] - halfSize];
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const endPoint = [centers[0] + halfSize, centers[1] + halfSize];
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return { startPoint, endPoint, palmLandmarks: box.palmLandmarks };
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}
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function shiftBox(box, shiftFactor) {
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const boxSize = [
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box.endPoint[0] - box.startPoint[0],
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box.endPoint[1] - box.startPoint[1],
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];
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const shiftVector = [boxSize[0] * shiftFactor[0], boxSize[1] * shiftFactor[1]];
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const startPoint = [box.startPoint[0] + shiftVector[0], box.startPoint[1] + shiftVector[1]];
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const endPoint = [box.endPoint[0] + shiftVector[0], box.endPoint[1] + shiftVector[1]];
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return { startPoint, endPoint, palmLandmarks: box.palmLandmarks };
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}
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export {
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cutBoxFromImageAndResize,
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enlargeBox,
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getBoxCenter,
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getBoxSize,
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scaleBoxCoordinates,
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shiftBox,
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squarifyBox,
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};
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