Geometry transformation is the basis of many image processing procedure.The linear interpolation method need little computation and can maintain image quality to some extent

so it is selected for the image geometry transformation in many cases.But the linear interpolation still need to be speed up when real-time processing is needed or being computed on devices with poor computing capacity.In this paper

two rules are concluded to integerize operands of an expression computed on digital devices.Based on the two rules

a scheme is proposed to integerize bilinear image interpolation (trilinear interpolation can be as the same)

under conditions that the result of which has no loss in precision compared to the result of the original method.Then

the most frequently used transformation

affine transformation

is taken as an example to give a scheme and its analysis to integerize the whole image transformation procedure.The experiment on PC shows that the proposed scheme is much faster than the original method.In addition

the scheme proposed in this paper is highly parallel.