Picture zooming method

The invention relates to the picture processing technology, in particular to a picture zooming method. The invention discloses a high-quality picture zooming method, which solves the problems of easy detail loss and poor amplification quality in the traditional picture zooming process. The invention has the main technical scheme that a horizontal amplification factor and a vertical amplification factor are obtained through the ratio of the breadth and height of a target rectangular region to be zoomed to the breadth and height of an original rectangular region of the picture, then, a mapping source point of a target point to be generated on the original picture is obtained through the horizontal amplification factor and the vertical amplification factor, a square adoption region with the edge length of 4 is taken around the mapping point, weight factors of sixteen sampling points are calculated, and finally, the color values of the sixteen sampling points are overlapped according to the weight factors to obtain the color value of the target point. The invention has the advantages that the picture zooming quality is improved, the occurrence of phenomena of detail loss and mosaic isavoided, and the invention is applicable for picture zooming.