Comments on: Multidimensional interpolation with integer input

By: Steve

Steve — Wed, 13 Aug 2008 16:26:16 +0000

Reji—Yes, you can use interp2 for cubic spline interpolation of an image. I do not know why you received an error message. You’ll need to check your interp2 inputs carefully against the description in the reference page for interp2.

Continuous-time convolution kernels can be used for interpolation. For example, linear interpolation can be viewed as convolution of an impulse train with a triangular kernel. However, cubic spline interpolation is more involved, because the proper kernel weights are data-dependent.

By: reji A p

reji A p — Mon, 11 Aug 2008 04:42:14 +0000

hai
I want to upsample the image using cubic spline interpolation.
Can I use ‘interp2′ instruction for cubic spline interpolation of image(both colour and grey)
Can I use convolution methods for cubic spline interpolation
‘Pratt’ in his image processing book mentioned that convolution kernals can be used for interpolation.
reji

By: reji A p

reji A p — Mon, 04 Aug 2008 09:21:19 +0000

Sir

thank you very much for giving information for my last question.sir now I want to upsample the image using cubic spline interpolation.sir I used the following code [X,Y]=meshgrid(2:2:256)
Z(X,Y)=Image
[X1,Y1]=meshgrid(2:1:256)

Z1 = interp2(X,Y,Z,X1,Y1,’spline’)

I got the error” Subscripted assignment dimension mismatch”.

Can I use ‘interp2′ instruction for cubic spline interpolation of image(both colour and grey)
reji

By: Steve

Steve — Tue, 04 Dec 2007 14:01:26 +0000

Damodar—You might find the function roifill to be useful for interpolating in the gray value image based on the locations of the high contrast objects. I’m not I understand your second question. If you overlay the high-contrast objects over the original image, which has been changed only by modifying the pixels where the high-contrast objects are, wouldn’t you expect the result to look just like the original image?

By: Damodar

Damodar — Thu, 22 Nov 2007 02:56:26 +0000

Hi Steve:

i have a gray value image(512×512), it has some high contrast objects in it. i extracted the high contrast objects from the gray value image and created another binary image of same size. now, i want to do interpolation on the gray value image where/under the high contrast objects are, and i also want to overlay the high contrast objects image on the interploated new image. could you please help me in this step?

Thank U.
Sincerely
Damodar

By: tr

tr — Fri, 07 Jul 2006 06:23:26 +0000

thank u sir