Package Exports

dltjs

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Readme

DLT.js

This is a package that compute DLT (Direct Linear Transformation) matrix, which can be used to transform points from one coordinate to another.

For details about DLT, please see https://www.cs.ubc.ca/grads/resources/thesis/May09/Dubrofsky_Elan.pdf.

Install

npm install dltjs

Usage

import dlt from 'dltjs';


let p0 = [[0, 0], [0, 1], [1, 0], [1, 1]];
let p1 = [[1, 1], [1, 2], [0, 1], [2, 2]];
let M = dlt.dlt2d(p0, p1);

let p = [3, 3];
console.log(dlt.transform2d(M, p));

Reference

dlt.dlt2d(p0, p1) Given two sets of points p0, p1, solve the transform matrix which can transform points in p0 to points in p1. Both p0, p1 must contain at least 4 points (only the first 4 points will be used). Each point should be a tuple in format of [x, y]. This function will return a 3x3 matrix which contains the transforms required. The last element (M[2][2]) is guaranteed to be 1.
dlt.transform2d(M, p) Transform point p with matrix M. Point p should be in format of [x, y]. The input M is the return value from dlt.dlt2d() and M[2][2] should be 1. The return value is the transformed point in format of [x, y].