quadtree的用法和樣例：
例句
- A digital watermarking algorithm based on quadtree fractal coding.
一種基于四叉樹(shù)分形編碼的數字水印算法。 - The method separates a binary image by means of the quadtree method while the image size can be dynamically changed.
這種方法采用二值圖像的四叉樹(shù)表示方法實(shí)現圖像分割，圖像塊的尺寸可以動(dòng)態(tài)調整。
