METHOD FOR DYNAMIC 3D WAVELET TRANSFORM FOR VIDEO COMPRESSION

摘要

A dynamic 3D wavelet transform system and method (fig.1) for compressing video including color or black and white signal. The method (fig.1) applies a so-called packed integer wavelet transform to individual video frames to generate wavelet coefficients in the spatial domain (fig. 2) (x and y). All the similar frames are grouped together for performing the wavelet transform in the temporal domain (t direction) (fig. 5). A frame with different content will start a new group until another different frame is reached. Compression is achieved based on the 2D wavelet transform in the LH, HL, and HH bands, and 3D wavelet transform in the LL band (fig.2). Using the LL band reduces the operation space and computation time for the wavelet transform while achieving a high compression ratio because the wavelet transform coefficients in the LH, HL, and HH are space.