Wrap image around a circle

Question

What I\'m trying to do in this example is wrap an image around a circle, like below.

To wrap the image I simply calculated the x,y coordinates using tr

Answer 1

I think what you need is a noise filter. There are many implementations from which I think Gaussian filter would give a good result. You can find a list of filters here. If it gets blurred too much:

• keep your first calculated image
• calculate filtered image
• copy fixed pixels from filtered image to first calculated image

Here is a crude average filter written by hand:

cir_R = int(Ro*2) # outer circle 2*r
inner_r = int(Ro - 0.5 - len(img)) # inner circle r
for i in range(1, cir_R-1):
    for j in range(1, cir_R-1):
        if cir[i][j] == 0: # missing pixel
            dx = int(i-Ro)
            dy = int(j-Ro)
            pix_r2 = dx*dx + dy*dy # distance to center
            if pix_r2 <= Ro*Ro and pix_r2 >= inner_r*inner_r:
                cir[i][j] = (cir[i-1][j] + cir[i+1][j] + cir[i][j-1] +
                    cir[i][j+1])/4


shom_im(cir)

and the result:

This basically scans between two ranges checks for missing pixels and replaces them with average of 4 pixels adjacent to it. In this black white case it is all white.

Hope it helps!