说明：  本次实验中对视频的I帧和P帧进行SNR可伸缩编码，可分级的级数为2。在I帧编码时，首先采用较大的量化矩阵进行量化，完成编码后的图像作为基本层
(The experiments on the video frames and the I to P frame SNR scalable coding, can be graded series of 2. In the I-frame coding, the first to quantify the larger matrix to quantify the complete image is encoded as a basic layer)