edgetaper (Image Processing Toolbox)

Taper the discontinuities along the image edges

Syntax

```
J = edgetaper(I,PSF)
```

Description

J = edgetaper(I,PSF) blurs the edges of the input image, I, using the point spread function, PSF. The output image, J, is the weighted sum of the original image, I, and its blurred version. The weighting array, determined by the autocorrelation function of PSF, makes J equal to I in its central region, and equal to the blurred version of I near the edges.

The edgetaper function reduces the ringing effect in image deblurring methods that use the discrete Fourier transform, such as deconvwnr, deconvreg, and deconvlucy.

Note The size of the PSF cannot exceed half of the image size in any dimension.

Class Support

I and PSF can be of class uint8, uint16, or double. J is of the same class as I.

Example

I = imread('cameraman.tif'); 
PSF = fspecial('gaussian',60,10);
J = edgetaper(I,PSF);
subplot(1,2,1);imshow(I,[]);title('original image');
subplot(1,2,2);imshow(J,[]);title('edges tapered');

See Also

deconvlucy, deconvreg, deconvwnr, otf2psf, padarray, psf2otf

edge erode