QDMA is adopted to overcome the difficulty of image zooming of channel multiplexer. Not only it is the fastest, but it can zoom in from QCIF to CIF resolution without noticeable quality deterioration.

• 画面分割的难点主要体现在画面的实时放大和缩小,本文采用QDMA插值法来实现画面的放大,此种方式放大的速度最快,并且对于画面从QCIF分辨率放大到CIF分辨率,图像质量是可以接受的。