Image Compression Based on Time-Domain Lapped Transform and Quadtree Partition

We proposed a new image compression system based on quadtree partition and time-domain lapped transform (TDLT) as core transform technology. The system obtained transformation region of different sizes through quadtree partition. And it removed the correlation by utilizing pixel similarity in image regions. The performance of discrete cosine transform (DCT) was improved with the method of pre-filter and post-filter. Superior performance can be achieved in most cases than the fixed block TDLT and DWT about the rate-distortion and subjective visual quality.