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imgproc: fix bit-exact GaussianBlur() / sepFilter2D() (#15855)

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* imgproc: fix bit-exact GaussianBlur() / sepFilter2D()

- avoid kernels with bad approximation
- GaussiabBlur - apply error-diffusion approximation for kernel (8-bit fraction)

* java(test): update features2d ref data

* test: update test_facedetect
This commit is contained in:
Alexander Alekhin
2019-11-18 01:39:27 +03:00
committed by GitHub
parent 955b20230c
commit f4d55d512f
13 changed files with 349 additions and 117 deletions
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modules/objdetect/misc/python/test/test_facedetect.py
+1 -1
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@@ -50,7 +50,7 @@ class facedetect_test(NewOpenCVTests):
img = self.get_sample( sample)
gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
gray = cv.GaussianBlur(gray, (5, 5), 5.1)
gray = cv.GaussianBlur(gray, (5, 5), 0)
rects = detect(gray, cascade)
faces.append(rects)