images.resize.spec.js

/* eslint-env mocha */
'use strict';

var expect = require('expect.js');

var nj = require('../../src');

describe('images', function () {
  describe('resize', function () {
    it('should be able to downscale a Grayscale img', function () {
      var resized = nj.images.resize(nj.images.data.digit, 14, 10);
      expect(resized).to.be.an(nj.NdArray);
      expect(resized.shape).to.eql([14, 10]);
      expect(resized.tolist())
        .to.eql([
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        [0, 0, 0, 0, 6, 9, 66, 51, 106, 94],
        [0, 13, 140, 189, 233, 253, 253, 143, 159, 75],
        [0, 5, 178, 217, 241, 98, 172, 0, 0, 0],
        [0, 0, 4, 74, 197, 1, 0, 0, 0, 0],
        [0, 0, 0, 3, 180, 114, 28, 0, 0, 0],
        [0, 0, 0, 0, 21, 182, 220, 51, 0, 0],
        [0, 0, 0, 0, 0, 4, 149, 236, 16, 0],
        [0, 0, 0, 0, 47, 165, 236, 224, 1, 0],
        [0, 0, 23, 152, 245, 240, 135, 20, 0, 0],
        [57, 167, 245, 251, 148, 23, 0, 0, 0, 0],
        [98, 127, 87, 37, 0, 0, 0, 0, 0, 0],
        [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]);
    });

    it('should be able to upscale a Grayscale img', function () {
      var resized = nj.images.resize(nj.images.data.digit, 32, 32);
      expect(resized).to.be.an(nj.NdArray);
      expect(resized.dtype).to.equal('uint8');
      expect(resized.shape).to.eql([32, 32]);
    });
  });
});