平滑粗糙边缘轮廓opencv

Question

I have this image

when you zoom it you can see the rough edges like this

I want to smoothen the rough edges such that they form an almost perfect curve/line,some what like this

I tried this method Image edge smoothing But I can't seem to save it as a bmp file. I tried Gaussian blur too but didn't get any much affect. The outlines are contours extracted from a binary image. Increasing the thickness of the contours removes the rough edges to a point but it changes the clear definition of the boundaries.

EDIT:-How about filled binary images?

This

to

Dilating would change the boundary too much.

Answer 1

What you are looking for is not possible in the manner you are thinking of. As @Miki stated, Digital images have an upper limit of resolution that you can not go further than it.

The solution is to represent your curves as vectorized curves. Then you can render at any resolution you want. One possible solution is to use Bezier Curves to represent the contours (or Spline ). Then you may simply draw them with any resize fraction you want.

Here you can find some resources:

• Are there any good libraries for solving cubic splines in C++?
• Spline, B-Spline and NURBS C++ library
• OpenCV - Fit a curve to a set of points