Error Concealment | JPEG | MPEG-4 | Wavelet | YUV

hai friends
     i am trying to rotate the grayscale image 

    i am using the equation 
          x2=cos(ang)*(x1-x0) - sin(ang)*(y1-y0) + x0
          Y2=cos(ang)*(x1-x0) + sin(ang)*(y1-y0) + y0

 where x0 y0 are the origne of rotation and x1 y1 are corrent point
 and x2 y2 new point after rotation
  
  my problem is that after rotation i am not getting the clear image 
i think i need to do the billinear interpolation
   how is this billinear interpolation done ?

  waiting for replay
                             joshy

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