@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
113 lines (112 loc) • 5.99 kB
JavaScript
"use strict";
/*
* Copyright 2007 ZXing authors
*
* 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 });
/*namespace com.google.zxing.common {*/
/**
* <p>This class implements a perspective transform in two dimensions. Given four source and four
* destination points, it will compute the transformation implied between them. The code is based
* directly upon section 3.4.2 of George Wolberg's "Digital Image Warping"; see pages 54-56.</p>
*
* @author Sean Owen
*/
var PerspectiveTransform = /** @class */ (function () {
function PerspectiveTransform(a11 /*float*/, a21 /*float*/, a31 /*float*/, a12 /*float*/, a22 /*float*/, a32 /*float*/, a13 /*float*/, a23 /*float*/, a33 /*float*/) {
this.a11 = a11;
this.a21 = a21;
this.a31 = a31;
this.a12 = a12;
this.a22 = a22;
this.a32 = a32;
this.a13 = a13;
this.a23 = a23;
this.a33 = a33;
}
PerspectiveTransform.quadrilateralToQuadrilateral = function (x0 /*float*/, y0 /*float*/, x1 /*float*/, y1 /*float*/, x2 /*float*/, y2 /*float*/, x3 /*float*/, y3 /*float*/, x0p /*float*/, y0p /*float*/, x1p /*float*/, y1p /*float*/, x2p /*float*/, y2p /*float*/, x3p /*float*/, y3p /*float*/) {
var qToS = PerspectiveTransform.quadrilateralToSquare(x0, y0, x1, y1, x2, y2, x3, y3);
var sToQ = PerspectiveTransform.squareToQuadrilateral(x0p, y0p, x1p, y1p, x2p, y2p, x3p, y3p);
return sToQ.times(qToS);
};
PerspectiveTransform.prototype.transformPoints = function (points) {
var max = points.length;
var a11 = this.a11;
var a12 = this.a12;
var a13 = this.a13;
var a21 = this.a21;
var a22 = this.a22;
var a23 = this.a23;
var a31 = this.a31;
var a32 = this.a32;
var a33 = this.a33;
for (var i = 0; i < max; i += 2) {
var x = points[i];
var y = points[i + 1];
var denominator = a13 * x + a23 * y + a33;
points[i] = (a11 * x + a21 * y + a31) / denominator;
points[i + 1] = (a12 * x + a22 * y + a32) / denominator;
}
};
PerspectiveTransform.prototype.transformPointsWithValues = function (xValues, yValues) {
var a11 = this.a11;
var a12 = this.a12;
var a13 = this.a13;
var a21 = this.a21;
var a22 = this.a22;
var a23 = this.a23;
var a31 = this.a31;
var a32 = this.a32;
var a33 = this.a33;
var n = xValues.length;
for (var i = 0; i < n; i++) {
var x = xValues[i];
var y = yValues[i];
var denominator = a13 * x + a23 * y + a33;
xValues[i] = (a11 * x + a21 * y + a31) / denominator;
yValues[i] = (a12 * x + a22 * y + a32) / denominator;
}
};
PerspectiveTransform.squareToQuadrilateral = function (x0 /*float*/, y0 /*float*/, x1 /*float*/, y1 /*float*/, x2 /*float*/, y2 /*float*/, x3 /*float*/, y3 /*float*/) {
var dx3 = x0 - x1 + x2 - x3;
var dy3 = y0 - y1 + y2 - y3;
if (dx3 === 0.0 && dy3 === 0.0) {
// Affine
return new PerspectiveTransform(x1 - x0, x2 - x1, x0, y1 - y0, y2 - y1, y0, 0.0, 0.0, 1.0);
}
else {
var dx1 = x1 - x2;
var dx2 = x3 - x2;
var dy1 = y1 - y2;
var dy2 = y3 - y2;
var denominator = dx1 * dy2 - dx2 * dy1;
var a13 = (dx3 * dy2 - dx2 * dy3) / denominator;
var a23 = (dx1 * dy3 - dx3 * dy1) / denominator;
return new PerspectiveTransform(x1 - x0 + a13 * x1, x3 - x0 + a23 * x3, x0, y1 - y0 + a13 * y1, y3 - y0 + a23 * y3, y0, a13, a23, 1.0);
}
};
PerspectiveTransform.quadrilateralToSquare = function (x0 /*float*/, y0 /*float*/, x1 /*float*/, y1 /*float*/, x2 /*float*/, y2 /*float*/, x3 /*float*/, y3 /*float*/) {
// Here, the adjoint serves as the inverse:
return PerspectiveTransform.squareToQuadrilateral(x0, y0, x1, y1, x2, y2, x3, y3).buildAdjoint();
};
PerspectiveTransform.prototype.buildAdjoint = function () {
// Adjoint is the transpose of the cofactor matrix:
return new PerspectiveTransform(this.a22 * this.a33 - this.a23 * this.a32, this.a23 * this.a31 - this.a21 * this.a33, this.a21 * this.a32 - this.a22 * this.a31, this.a13 * this.a32 - this.a12 * this.a33, this.a11 * this.a33 - this.a13 * this.a31, this.a12 * this.a31 - this.a11 * this.a32, this.a12 * this.a23 - this.a13 * this.a22, this.a13 * this.a21 - this.a11 * this.a23, this.a11 * this.a22 - this.a12 * this.a21);
};
PerspectiveTransform.prototype.times = function (other) {
return new PerspectiveTransform(this.a11 * other.a11 + this.a21 * other.a12 + this.a31 * other.a13, this.a11 * other.a21 + this.a21 * other.a22 + this.a31 * other.a23, this.a11 * other.a31 + this.a21 * other.a32 + this.a31 * other.a33, this.a12 * other.a11 + this.a22 * other.a12 + this.a32 * other.a13, this.a12 * other.a21 + this.a22 * other.a22 + this.a32 * other.a23, this.a12 * other.a31 + this.a22 * other.a32 + this.a32 * other.a33, this.a13 * other.a11 + this.a23 * other.a12 + this.a33 * other.a13, this.a13 * other.a21 + this.a23 * other.a22 + this.a33 * other.a23, this.a13 * other.a31 + this.a23 * other.a32 + this.a33 * other.a33);
};
return PerspectiveTransform;
}());
exports.default = PerspectiveTransform;