Proposal for transparent cascading of 3:4 up and subsequent 4:3 down conversion filtering

作     者：Werner, O 

作者机构：BBC Res & Dev Dept Surrey England 

出 版 物：《IEE PROCEEDINGS-VISION IMAGE AND SIGNAL PROCESSING》 (IEE Proc Vision Image Signal Proc)

年 卷 期：1999年第146卷第6期

页      面：334-338页

核心收录：

主　　题：video signals grade 1 studio monitor high subjective quality 4:3 down conversion filtering small amplitude errors digital filters identity operator filter calculations FIR filters image resolution 3:4 FIR Nyquist up conversion filter Filtering methods in signal processing Video signal processing 3:4 up conversion filtering standard TV resolution video signal processing Optical, image and video signal processing 4:3 FIR Nyquist down conversion filter transparent cascading filtering theory filter coefficients experimental results 

摘      要：A proposal is described which is based on a 3:4 FIR Nyquist up conversion filter and a corresponding 4:3 FIR Nyquist down conversion filter that on cascading result mathematically in the identity operator. The proposed filters are applied horizontally to critical video signals. Experimental results show that, despite the limited numerical precision of filter coefficients and filter calculations, an almost (55 dB) transparent cascade can be achieved. The small amplitude errors are in the order of +/- 1 unit and found to be invisible when the pictures are displayed on a grade 1 studio monitor of standard TV resolution. Additionally, a high subjective quality for up converted pictures is achieved and maintained over several cascades.