85 lines
2.4 KiB
JavaScript
85 lines
2.4 KiB
JavaScript
import ImageRegion from './ImageRegion.js';
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import {blur2D} from './Blur.js';
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describe('Blur', () => {
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const PRECISION = 0.01;
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function diracDelta(pad) {
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const values = [];
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const dim = pad * 2 + 1;
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for(let y = 0; y < dim; ++ y) {
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for(let x = 0; x < dim; ++ x) {
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values[y * dim + x] = (y === pad && x === pad) ? 1 : 0;
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}
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}
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return ImageRegion.fromValues(dim, dim, values);
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}
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describe('blur2D', () => {
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it('returns a new image of the same size', () => {
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const input = diracDelta(20);
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const output = blur2D(input, 1);
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expect(output).not.toBe(input);
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expect(output.width).toEqual(input.width);
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expect(output.height).toEqual(input.height);
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expect(output.dim).toEqual(input.dim);
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expect(output.values).not.toBe(input.values);
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});
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it('uses the given target if specified', () => {
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const input = diracDelta(20);
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const target = ImageRegion.ofSize(41, 41, 1);
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const output = blur2D(input, 1, {target});
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expect(output).toBe(target);
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});
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it('blurs the given image using a gaussian kernel', () => {
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const output = blur2D(diracDelta(20), 1);
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expect(output.sum()).toBeNear(1, PRECISION);
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expect(output.get(20, 20)).toBeNear(0.159, PRECISION);
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const v01 = output.get(20, 21);
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expect(v01).toBeNear(0.096, PRECISION);
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expect(output.get(21, 20)).toBeNear(v01, PRECISION);
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expect(output.get(19, 20)).toBeNear(v01, PRECISION);
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expect(output.get(20, 19)).toBeNear(v01, PRECISION);
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const v11 = output.get(21, 21);
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expect(v11).toBeNear(0.058, PRECISION);
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expect(output.get(21, 19)).toBeNear(v11, PRECISION);
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expect(output.get(19, 21)).toBeNear(v11, PRECISION);
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expect(output.get(19, 19)).toBeNear(v11, PRECISION);
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expect(output.get(20, 22)).toBeNear(0.021, PRECISION);
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expect(output.get(21, 22)).toBeNear(0.013, PRECISION);
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expect(output.get(22, 22)).toBeNear(0.002, PRECISION);
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expect(output.get(10, 10)).toBeNear(0, PRECISION);
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});
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it('fills in 0s outside the region', () => {
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const output = blur2D(diracDelta(0), 1);
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expect(output.get(0, 0)).toBeNear(0.159, PRECISION);
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});
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});
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describe('ImageRegion.blur', () => {
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it('is added to the ImageRegion prototype', () => {
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expect(diracDelta(0).blur).toEqual(jasmine.any(Function));
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});
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it('invokes blur2D', () => {
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const output = diracDelta(0).blur(1);
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expect(output.get(0, 0)).toBeNear(0.159, PRECISION);
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});
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});
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});
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