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+function [out]=pyramid(inputimage,direction,level)
+// Computes the pyramid reduction or expansion of input_image
+//
+// Calling Sequence
+// output_image=pyramid(inputimage,direction,level);
+//
+// Parameters
+//
+// inputimage : image matrix on which pyramid reduction or expansion has to be applied
+// Direction  : An input string 'expand' for expand or 'reduce' for reduce the image matrix
+// level      : It is specify number of times want to expand or reduce the dimension of an image matrix.
+// output_image : Expanded or reduced form of image after pyramid reduction or expansion
+//
+// Description
+// This function computes the pyramid reduction or expansion of input image.It uses  Gaussian pyramid to downsamples and upsamples the image pixels.In reduction it     reduces the size of image (if m*n matrix image) by m/pow(2,level) and n/pow(2,level).In expansion it expands the size of image (if m*n matrix image) by m*pow(2,level) and n*pow(2,level).Where pow(x,y)=x^y.
+//
+// Examples
+// inputimage1 = imread('lena.jpeg');
+// a=opencv_pyramid(inputimage1,'expand',2);
+// imshow(a);
+//
+// Authors:
+//
+//Diwakar Bhardwaj
+
+
+
+          inputimage1=mattolist(inputimage);
+         a=opencv_pyramid(inputimage1,direction,level);
+         dimension=size(a)
+         for i = 1:dimension
+              out(:,:,i)=a(i);
+         end
+     
+endfunction;