In the quantization process of improved method,if the watermark point is key point,then use larger quantizing parameter Q to quantize wavelet coefficient,else use smaller Q .

• 与常规RRW算法不同 ；算法使用关键点信息 ；在对小波系数进行特征量化时 ；对关键点取较小的Q值 ；对非关键点取较大的Q值 .