How to implement Bicubic interpolation in an image?

I have 256*256 dimension image and I want to make it 512*512 using bicubic interpolation. How to do it using csapi(x,y) or csapi(x,y,xx) function? What should be taken inplace of x & y here?

Answer 1

[TheRealTonyStark]

The resizing of image using bicubic interpolation method:

Example

J = imresize(I, 2, 'bicubic');%in your case

J: Resized image.

I: input image.

0.5: scaling factor

Answer 2

[Image Analyst]

Simply use imresize():

resizedImage = imresize(originalImage, [512, 512]);

I never heard of the function csapi(). It does not show up in the help for my MATLAB.

[Nidhi Soni]

I need to use interpolation to enhance the image

[Image Analyst]

What's your definition of "enhance"? Merely resizing an image will not increase the resolution or make details any easier to see/resolve.

[Nidhi Soni]

I am trying to apply DWT and BEMD on an image. Then adding these DWT and BEMD components but DWT components have reduced dimension than BEMD component, So I want to interpolate them.

[TheRealTonyStark]

Increasing the size will create irreularities in the image. To smoothen that out we use spline fitting.