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const cv = require('../');

const detectAndComputeAsync = (det, img) =>

det.detectAsync(img)

.then(kps => det.computeAsync(img, kps)

.then(desc => ({ kps, desc }))

);

const img1 = cv.imread('../data/s0.jpg');

const img2 = cv.imread('../data/s1.jpg');

const detectorNames = [

'AKAZE',

'BRISK',

'KAZE',

'ORB'

];

const createDetectorFromName = name => new cv[`${name}Detector`]();

// create 4 promises -> each detector detects and computes descriptors for img1 and img2

const promises = detectorNames

.map(createDetectorFromName)

.map(det =>

// also detect and compute descriptors for img1 and img2 async

Promise.all([detectAndComputeAsync(det, img1), detectAndComputeAsync(det, img2)])

.then(allResults =>

cv.matchBruteForceAsync(

allResults[0].desc,

allResults[1].desc

)

.then(matches => ({

matches,

kps1: allResults[0].kps,

kps2: allResults[1].kps

}))

)

);

Promise.all(promises)

.then((allResults) => {

allResults.forEach((result, i) => {

const drawMatchesImg = cv.drawMatches(

img1,

img2,

result.kps1,

result.kps2,

result.matches

);

cv.imshowWait(detectorNames[i], drawMatchesImg);

cv.destroyAllWindows();

});

})

.catch(err => console.error(err));