please tell me about image interpolation.

i tried imresize function but in that i dint understand

In some paper, authors used image interpolation by factor alpha to increase or decrease the size of the image. please tell how this this alpha factor used in an image interpolation

Answer 1

[Walter Roberson]

scale = alpha;
newimage = imresize(YourImage, scale);

[sandeep kumar]

i referred one paper, in that he has given interpolation with factor 2 and interpolation with factor alpha/2. I tried implementing that, by using imresize function to enhance the image from 263X263 resolution to 512X512 resolution, but i couldn't understand how to give value to alpha.

[Walter Roberson]

MyImage = rand(263,263,3);
biggerImage = imresize(MyImage, 2);
smallerImage = imresize(MyImage, 1/2);
Image512a = imresize(MyImage, [512 512]);
Image512b = imresize(MyImage, 512/263);