resize method doesn't work properly

[targos]

It somehow "zooms" in the image. This is especially visible on the nearest-neighbor version of the test.

There's probably a bug in how we iterate on the pixels.
Implementation: https://github.com/image-js/image-js-typescript/blob/main/src/geometry/resize.ts#L55-L86

We need to fix it so these tests can be enabled:

image-js-typescript/src/geometry/__tests__/resize.test.ts

Lines 3 to 21 in 8d81c2b

	test.skip('compare result of resize with opencv (nearest)', () => {
	const img = testUtils.load('opencv/test.png');
	const resized = img.resize({
	xFactor: 10,
	yFactor: 10,
	interpolationType: 'nearest',
	});
	expect(resized).toMatchImage('opencv/testResizeNearest.png');
	});
	test.skip('compare result of resize with opencv (bilinear)', () => {
	const img = testUtils.load('opencv/test.png');
	const resized = img.resize({
	xFactor: 10,
	yFactor: 10,
	});

Reference created by

image-js-typescript/test/img/opencv/generate.py

Lines 15 to 19 in 8d81c2b

	# Image resizing by 10.
	dst = cv.resize(img, (80, 100), interpolation=cv.INTER_NEAREST)
	cv.imwrite('testResizeNearest.png', dst)
	dst = cv.resize(img, (80, 100), interpolation=cv.INTER_LINEAR)
	cv.imwrite('testResizeBilinear.png', dst)

[targos]

Current result:

diff --git a/src/geometry/__tests__/resize.test.ts b/src/geometry/__tests__/resize.test.ts
index df8c0e21..d95281d8 100644
--- a/src/geometry/__tests__/resize.test.ts
+++ b/src/geometry/__tests__/resize.test.ts
@@ -1,6 +1,6 @@
-import { encodePng } from '../../save';
+import { encodePng, writeSync } from '../../save';
 
-test.skip('compare result of resize with opencv (nearest)', () => {
+test('compare result of resize with opencv (nearest)', () => {
   const img = testUtils.load('opencv/test.png');
 
   const resized = img.resize({
@@ -9,6 +9,8 @@ test.skip('compare result of resize with opencv (nearest)', () => {
     interpolationType: 'nearest',
   });
 
+  writeSync('test.png', resized);
+
   expect(resized).toMatchImage('opencv/testResizeNearest.png');
 });
 

[targos]

For further improvements, we should probably look at:
https://github.com/opencv/opencv/blob/26a5730f0d36f547a6eaf39b1e15786ea3f0d039/modules/imgproc/src/opencl/resize.cl