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Add contrast limiting adaptive histogram equalization (CLAHE) operator (#2726)

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This commit is contained in:
Brad Parham
2021-05-23 18:36:04 +02:00
committed by GitHub
parent b69a54fc75
commit 4b6b6189bf
19 changed files with 245 additions and 6 deletions
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139
test/unit/clahe.js Normal file
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'use strict';
const assert = require('assert');
const sharp = require('../../lib');
const fixtures = require('../fixtures');
describe('Clahe', function () {
it('width 5 width 5 maxSlope 0', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 5, height: 5, maxSlope: 0 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-5-5-0.jpg'), data, { threshold: 10 }, done);
});
});
it('width 5 width 5 maxSlope 5', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 5, height: 5, maxSlope: 5 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-5-5-5.jpg'), data, done);
});
});
it('width 11 width 25 maxSlope 14', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 11, height: 25, maxSlope: 14 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-11-25-14.jpg'), data, done);
});
});
it('width 50 width 50 maxSlope 0', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 50, height: 50, maxSlope: 0 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-50-50-0.jpg'), data, done);
});
});
it('width 50 width 50 maxSlope 14', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 50, height: 50, maxSlope: 14 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-50-50-14.jpg'), data, done);
});
});
it('width 100 width 50 maxSlope 3', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 100, height: 50, maxSlope: 3 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-100-50-3.jpg'), data, done);
});
});
it('width 100 width 100 maxSlope 0', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 100, height: 100, maxSlope: 0 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-100-100-0.jpg'), data, done);
});
});
it('invalid maxSlope', function () {
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: 100, maxSlope: -5 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: 100, maxSlope: 110 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: 100, maxSlope: 5.5 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: 100, maxSlope: 'a string' });
});
});
it('invalid width', function () {
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100.5, height: 100 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: -5, height: 100 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: true, height: 100 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 'string test', height: 100 });
});
});
it('invalid height', function () {
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: 100.5 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: -5 });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: true });
});
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe({ width: 100, height: 'string test' });
});
});
it('invalid options object', function () {
assert.throws(function () {
sharp(fixtures.inputJpgClahe).clahe(100, 100, 5);
});
});
it('uses default maxSlope of 3', function (done) {
sharp(fixtures.inputJpgClahe)
.clahe({ width: 100, height: 50 })
.toBuffer(function (err, data, info) {
if (err) throw err;
assert.strictEqual('jpeg', info.format);
fixtures.assertSimilar(fixtures.expected('clahe-100-50-3.jpg'), data, done);
});
});
});