gradient image的用法和樣例：
例句
- This algorithm is based on the watershed transform.First the gradient image is preprocessed according to the pixels intensity and spatial information.
該方法在分水嶺演算法的基礎上，首先結合像素點亮度特徵和空間分佈特性應用自適應方法對梯度圖像進行預處理。 - The pre-processing algorithm is made of image simplification and image morphologic gradient.The post-processing is mainly region merging.
預處理演算法由圖像簡化和簡化后的求梯度圖像兩個部分組成，后處理主要是區域合併。
