test: enhance drawMatches tests

Author: opatiny

src/featureMatching/__tests__/__image_snapshots__/draw-matches-test-ts-alphabet-image-as-source-and-destination-1-snap.png renamed to src/featureMatching/__tests__/__image_snapshots__/draw-matches-test-ts-alphabet-image-as-source-and-destination-nb-keypoint-10-1-snap.png

@@ -1,19 +1,20 @@
-import { ImageColorModel } from '../../Image';
+import { ImageColorModel, Image } from '../../Image';
 import { bruteForceOneMatch } from '../bruteForceMatch';
-import { getBriefDescriptors } from '../getBriefDescriptors';
+import { BriefDescriptor, getBriefDescriptors } from '../getBriefDescriptors';
 import { getOrientedFastKeypoints } from '../getOrientedFastKeypoints';
 
-const source = testUtils.load('various/alphabet.jpg');
-const grey = source.convertColor(ImageColorModel.GREY);
-const sourceKeypoints = getOrientedFastKeypoints(grey);
-const sourceDescriptors = getBriefDescriptors(grey, sourceKeypoints);
-
-const destination = testUtils.load('various/alphabet.jpg');
-const grey2 = destination.convertColor(ImageColorModel.GREY);
-const destinationKeypoints = getOrientedFastKeypoints(grey2);
-const destinationDescriptors = getBriefDescriptors(grey2, destinationKeypoints);
+function getDescriptors(image: Image): BriefDescriptor[] {
+  const grey = image.convertColor(ImageColorModel.GREY);
+  const sourceKeypoints = getOrientedFastKeypoints(grey);
+  return getBriefDescriptors(grey, sourceKeypoints);
+}
 
 test('nbBestMatches = 5', () => {
+  const source = testUtils.load('featureMatching/alphabet.jpg');
+  const sourceDescriptors = getDescriptors(source);
+  const destination = testUtils.load('featureMatching/alphabet.jpg');
+  const destinationDescriptors = getDescriptors(destination);
+
   const matches = bruteForceOneMatch(
     sourceDescriptors,
     destinationDescriptors,

src/featureMatching/__tests__/__image_snapshots__/draw-matches-test-ts-destination-rotated-1-snap.png

@@ -4,7 +4,7 @@ import { drawMatches } from '../drawMatches';
 import { getBriefDescriptors } from '../getBriefDescriptors';
 import { getOrientedFastKeypoints } from '../getOrientedFastKeypoints';
 
-test('alphabet image as source and destination', () => {
+test('alphabet image as source and destination, nbKeypoint = 10', () => {
   const source = testUtils.load('various/alphabet.jpg');
   const grey = source.convertColor(ImageColorModel.GREY);
   const sourceKeypoints = getOrientedFastKeypoints(grey, { maxNbFeatures: 10 });
@@ -33,17 +33,50 @@ test('alphabet image as source and destination', () => {
   expect(result).toMatchImageSnapshot();
 });
 
-test('destination rotated', () => {
-  const source = testUtils.load('various/alphabet.jpg');
+test('destination rotated +2°', () => {
+  const source = testUtils
+    .load('featureMatching/alphabet.jpg')
+    .convertColor(ImageColorModel.GREY);
+  const sourceKeypoints = getOrientedFastKeypoints(source);
+  const sourceDescriptors = getBriefDescriptors(source, sourceKeypoints);
+
+  const destination = testUtils
+    .load('featureMatching/alphabetRotated2.jpg')
+    .convertColor(ImageColorModel.GREY);
+  const destinationKeypoints = getOrientedFastKeypoints(destination);
+  const destinationDescriptors = getBriefDescriptors(
+    destination,
+    destinationKeypoints,
+  );
+  expect(sourceKeypoints.length).toBe(119);
+  expect(destinationKeypoints.length).toBe(135);
+
+  const matches = bruteForceOneMatch(
+    sourceDescriptors,
+    destinationDescriptors,
+    { nbBestMatches: 20 },
+  );
+
+  const result = drawMatches(
+    source,
+    destination,
+    sourceKeypoints,
+    destinationKeypoints,
+    matches,
+    { showScore: true },
+  );
+
+  expect(result).toMatchImageSnapshot();
+});
+
+test('destination rotated +10°', () => {
+  const source = testUtils.load('featureMatching/alphabet.jpg');
   const grey = source.convertColor(ImageColorModel.GREY);
   const sourceKeypoints = getOrientedFastKeypoints(grey);
   const sourceDescriptors = getBriefDescriptors(grey, sourceKeypoints);
 
-  const destination = testUtils
-    .load('various/alphabet.jpg')
-    .rotate(10, { fullImage: true });
+  const destination = testUtils.load('featureMatching/alphabetRotated10.jpg');
   const grey2 = destination.convertColor(ImageColorModel.GREY);
-
   const destinationKeypoints = getOrientedFastKeypoints(grey2);
   const destinationDescriptors = getBriefDescriptors(
     grey2,