| 摘要 |
A method for adaptively scaling an image is provided, and the method includes the following steps: receiving an input scaling ratio value Resize_xy; comparing the scaling ratio value Resize_xy with the threshold values Thresi (i=1, 2) respectively, wherein Thres1 > Thres2 , when Resize_xy > Thres1 , implementing the cubic rational spline interpolation to perform the image magnification; when Resize_xy > Thres2 , implementing the weighted cubic rational spline interpolation to perform the image reduction; and otherwise, implementing the image reduction operation based on the mapping image sub-block. On the one hand, with the new multimode image scaling algorithm of the present invention, the scaling algorithm could be selected adaptively according to the scaling ratio, so that the image scaling effect could achieve a good visual effect. On the other hand, with the weighted cubic rational spline interpolation of the present invention, the phenomenon that the zigzag edge would yield and the partial information would be lost after the image reduction could be improved, while a good definition could be maintained in other area. |
