From c3fff5e04dee88a0a6b14c94bedf9f778902024e Mon Sep 17 00:00:00 2001 From: dyte Date: Wed, 7 Aug 2019 17:42:04 +0200 Subject: [PATCH] initial commit with code in WIP state --- .eslintrc.json | 35 ++ package-lock.json | 1169 +++++++++++++++++++++++++++++++++++++ package.json | 38 ++ src/delta.js | 64 ++ src/index.js | 99 ++++ test/test.js | 63 ++ test/testimages/1-sub.png | Bin 0 -> 95 bytes test/testimages/1.png | Bin 0 -> 130 bytes test/testimages/2.png | Bin 0 -> 75 bytes 9 files changed, 1468 insertions(+) create mode 100644 .eslintrc.json create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/delta.js create mode 100644 src/index.js create mode 100644 test/test.js create mode 100644 test/testimages/1-sub.png create mode 100644 test/testimages/1.png create mode 100644 test/testimages/2.png diff --git a/.eslintrc.json b/.eslintrc.json new file mode 100644 index 0000000..1a1bf17 --- /dev/null +++ b/.eslintrc.json @@ -0,0 +1,35 @@ +{ + "env": { + 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-0,0 +1,38 @@ +{ + "name": "matches-subimage", + "version": "1.0.0", + "description": "Lightweight library that finds matches of an image within another image", + "main": "index.js", + "scripts": { + "lint": "eslint", + "test": "node test/test.js" + }, + "repository": { + "type": "git", + "url": "git+https://github.com/dieterwalckiers/matches-subimage.git" + }, + "keywords": [ + "image", + "pixels", + "comparison", + "match", + "matches", + "subimage", + "within", + "image", + "inside" + ], + "author": "Dieter Walckiers", + "license": "MIT", + "bugs": { + "url": "https://github.com/dieterwalckiers/matches-subimage/issues" + }, + "homepage": "https://github.com/dieterwalckiers/matches-subimage#readme", + "dependencies": { + "pngjs": "^3.4.0" + }, + "devDependencies": { + "eslint": "^6.1.0", + "tape": "^4.11.0" + } +} diff --git a/src/delta.js b/src/delta.js new file mode 100644 index 0000000..665cb2b --- /dev/null +++ b/src/delta.js @@ -0,0 +1,64 @@ +module.exports = pixelMatches; + +// calculate color difference according to the paper "Measuring perceived color difference +// using YIQ NTSC transmission color space in mobile applications" by Y. Kotsarenko and F. Ramos +function pixelMatches(img1, img2, k, m, maxDelta, yOnly) { + + if ((k + 3) >= img1.length) { + return false; + // throw new Error(`Cannot get positions ${k} through ${k + 3} from img array of length ${img1.length}`); + } + if ((m + 3) >= img2.length) { + return false; + // throw new Error(`Cannot get positions ${m} through ${m + 3} from img array of length ${img2.length}`); + } + + let r1 = img1[k + 0]; + let g1 = img1[k + 1]; + let b1 = img1[k + 2]; + let a1 = img1[k + 3]; + + let r2 = img2[m + 0]; + let g2 = img2[m + 1]; + let b2 = img2[m + 2]; + let a2 = img2[m + 3]; + + if (a1 === a2 && r1 === r2 && g1 === g2 && b1 === b2) return true; + + if (a1 < 255) { + a1 /= 255; + r1 = blend(r1, a1); + g1 = blend(g1, a1); + b1 = blend(b1, a1); + } + + if (a2 < 255) { + a2 /= 255; + r2 = blend(r2, a2); + g2 = blend(g2, a2); + b2 = blend(b2, a2); + } + + const y = rgb2y(r1, g1, b1) - rgb2y(r2, g2, b2); + + let delta; + + if (yOnly) { // brightness difference only + delta = y; + } else { + const i = rgb2i(r1, g1, b1) - rgb2i(r2, g2, b2); + const q = rgb2q(r1, g1, b1) - rgb2q(r2, g2, b2); + delta = 0.5053 * y * y + 0.299 * i * i + 0.1957 * q * q; + } + // console.log(`d:${delta}, compared to maxDelta (${maxDelta}) getting a ${delta <= maxDelta ? "match" :"non-match"}`); + return delta <= maxDelta; +} + +function rgb2y(r, g, b) { return r * 0.29889531 + g * 0.58662247 + b * 0.11448223; } +function rgb2i(r, g, b) { return r * 0.59597799 - g * 0.27417610 - b * 0.32180189; } +function rgb2q(r, g, b) { return r * 0.21147017 - g * 0.52261711 + b * 0.31114694; } + +// blend semi-transparent color with white +function blend(c, a) { + return 255 + (c - 255) * a; +} \ No newline at end of file diff --git a/src/index.js b/src/index.js new file mode 100644 index 0000000..e057e83 --- /dev/null +++ b/src/index.js @@ -0,0 +1,99 @@ +const pixelMatches = require("./delta"); +module.exports = subImageFoundInImage; + +const defaultOptions = { + threshold: 0.1, // matching threshold (0 to 1); smaller is more sensitive + // includeAA: false, // whether to skip anti-aliasing detection. WIP (see pixelmatch package) +}; + +function subImageFoundInImage(img, subImg, optionsParam) { + + const { data: imgData, width: imgWidth, height: imgHeight } = img; + const { data: subImgData, width: subImgWidth, height: subImgHeight } = subImg; + + console.log(`img is ${imgWidth} x ${imgHeight}`); + console.log(`subImg is ${subImgWidth} x ${subImgHeight}`); + + + if (!isPixelData(imgData) || !isPixelData(subImgData)) { + throw new Error("Image data: Uint8Array, Uint8ClampedArray or Buffer expected."); + } + if (img.length < subImg.length) { + throw new Error("Subimage is larger than base image"); + } + const options = Object.assign({}, defaultOptions, optionsParam); + const maxDelta = 35215 * options.threshold * options.threshold; + + console.log("max delta", maxDelta); + + let subImgPos = 0; + let matchingTopRowStartX = 0; + let matchingTopRowStartY = 0; + + for (let y = 0; y < imgHeight; y++) { + + matchingTopRowX = 0; // restart finding top row mode when we hit a new row in the main img + for (let x = 0; x < imgWidth; x++) { + + const imgPos = posFromCoordinates(y, x, imgWidth); + + const matches = pixelMatches(imgData, subImgData, imgPos, subImgPos, maxDelta); + if (matches) { + + if (matchingTopRowX === 0) { + // This means this is a new matching row, save these coordinates in the matchingTopRowStartX and Y + matchingTopRowStartX = x; + matchingTopRowStartY = y; + } + + matchingTopRowX++; + if (matchingTopRowX === subImgWidth) { + // console.log(`rowmatch on ${matchingTopRowStartY}-${matchingTopRowStartX}, now checking the rows below!`); + if (subImageFoundOnCoordinates(img, subImg, matchingTopRowStartY, matchingTopRowStartX, maxDelta)) { + return true; + } + matchingTopRowX = 0; + } + } else { + matchingTopRowX = 0; // restart finding top row mode when 2 pixels don't match + } + } + } + return false; +} + +function subImageFoundOnCoordinates(img, subImg, matchY, matchX, maxDelta) { + const { data: imgData, width: imgWidth } = img; + const { data: subImgData, width: subImgWidth, height: subImgHeight } = subImg; + let subImgX = 0; + let subImgY = 0; + for (let imgY = matchY; imgY < (matchY + subImgHeight); imgY++) { + subImgX = 0; + console.log(`checking row ${imgY} (${subImgY} in subImg), from ${matchX} to ${matchX + subImgWidth - 1}`); + + for (let imgX = matchX; imgX < (matchX + subImgWidth); imgX++) { + + const imgPos = posFromCoordinates(imgY, imgX, imgWidth); + const subImgPos = posFromCoordinates(subImgY, subImgX, subImgWidth); + const matches = pixelMatches(imgData, subImgData, imgPos, subImgPos, maxDelta); + if (!matches) { + console.log(`matches is ${matches}, so nope for coords ${imgY}-${imgX} (${subImgY}-${subImgX} on subImg)`); + return false; + } + subImgX++; + } + subImgY >= 0 && console.log(`row ${subImgY} matches`); + subImgY++; + } + console.log(`complete match on ${matchY}-${matchX}`); + return true; +} + +function isPixelData(arr) { + // work around instanceof Uint8Array not working properly in some Jest environments + return ArrayBuffer.isView(arr) && arr.constructor.BYTES_PER_ELEMENT === 1; +} + +function posFromCoordinates(y, x, width) { + return (y * width + x) * 4; +} \ No newline at end of file diff --git a/test/test.js b/test/test.js new file mode 100644 index 0000000..0420c92 --- /dev/null +++ b/test/test.js @@ -0,0 +1,63 @@ +const test = require("tape"); +const pngjs = require("pngjs"); +const path = require("path"); +const fs = require("fs"); +const subImageFoundInImage = require("../src"); + +// eslint-disable-next-line no-undef +const getTestImgPath = (filename) => path.join(__dirname, `testimages/${filename}.png`); + +// test("throws error if provided wrong image data format", (t) => { +// const err = "Image data: Uint8Array, Uint8ClampedArray or Buffer expected"; +// const arr = new Uint8Array(4 * 20 * 20); +// const bad = new Array(arr.length).fill(0); +// t.throws(() => subImageFoundInImage(bad, arr), err); +// t.throws(() => subImageFoundInImage(arr, bad), err); +// t.end(); +// }); + + +// test("throws error sub image is larger than base image", (t) => { +// const err = "Subimage is larger than base image"; +// const smallArr = new Uint8Array(4 * 10 * 10); +// const largeArr = new Uint8Array(4 * 20 * 20); +// t.throws(() => subImageFoundInImage(smallArr, largeArr), err); +// t.end(); +// }); + +// test("Matches on 2 identical images", (t) => { +// const img1 = readImage(getTestImgPath("1")); +// const img2 = readImage(getTestImgPath("1")); +// const matches = subImageFoundInImage(img1, img2); +// t.ok(matches, "should find match"); +// t.end(); +// }); + +// test("Doesn't match on 2 different images", (t) => { +// const img1 = readImage(getTestImgPath("1-sub")); +// const img2 = readImage(getTestImgPath("2")); +// const matches = subImageFoundInImage(img1, img2); +// t.notOk(matches, "shouldn't find match"); +// t.end(); +// }); + +test("Find sub-image match within image", (t) => { + const img = readImage(getTestImgPath("1")); + const subImg = readImage(getTestImgPath("1-sub")); + const matches = subImageFoundInImage(img, subImg); + t.ok(matches, "should find match"); + t.end(); +}); + +test("Find sub-image match within image (larger imgs)", (t) => { + const img = readImage(getTestImgPath("3b")); + const subImg = readImage(getTestImgPath("3-sub")); + const matches = subImageFoundInImage(img, subImg); + t.ok(matches, "should find match"); + t.end(); +}); + +const readImage = (path) => { + // eslint-disable-next-line no-undef + return pngjs.PNG.sync.read(fs.readFileSync(path)); +}; diff --git a/test/testimages/1-sub.png b/test/testimages/1-sub.png new file mode 100644 index 0000000000000000000000000000000000000000..a809b02f136fd51f31a872c7ce7d7e94dd5aedbb GIT binary patch literal 95 zcmeAS@N?(olHy`uVBq!ia0vp^%plCc1|-8Yw(bW~YMw5RArj%qcV<{TwpV6WK3v~c s&(kwoDE;5|DUqiO9(futD{taq(3`=}Fn7|9ZlDeZPgg&ebxsLQ02`?qT>t<8 literal 0 HcmV?d00001 diff --git a/test/testimages/1.png b/test/testimages/1.png new file mode 100644 index 0000000000000000000000000000000000000000..652fcf2170fa627c6dce42c9a0fc107eb8f7c758 GIT binary patch literal 130 zcmeAS@N?(olHy`uVBq!ia0vp^>_E)M!3HGx`C7_=l&7bQV~9j}@|wcx&+{MJGc$K2 zq@*}7_L%0a|G$_^u|i|gvrDfZ7^%-^GfeP^IgTe~DWM4f4U7=d literal 0 HcmV?d00001