As the most important technology bass of information industry

digital image proceesing technology has been entering into a brilliant developing era in theory and application under the drive of internet and media application. A varity of algorithms and products have come forth

growing or disappearing out of competition in marketing. Image digital zoom(view interpolation) is one of the most important image procesing technology for digital still camera

which is used to improve the vision resolution and to satisfy demands out of some special processing algorithms. The correlativity theory is the base of image digital zoom(view interpolation)?smoothing and filtering. The spatial and gray correlativity between pixels are studied in the respect of the correlative coefficent

and the spatial distance and gray distance are defined. Based on these results

the digital zoom(view interpolation) and its discrete algorithm are constructed. The emulation result shows that the algorithm is available and efficient in digital still camera zoom function for its least distortion in color and geometry. The discrete algorithm has been used in I.Photo serial digital still camera.