Abstract
Two different schemes, i.e. adaptive and nonadaptive systems, are developed for intrafield transform (2d-DCT) image processing of a digital NTSC color composite video signal, sampled at three times the color subcarrier frequency. The fast transform algorithm for 2d-DCT (8 × 8 subblock) is used. Based on the statistics of the transform coefficients, variable word length quantizers, optimized for minimizing the mean square error, are developed. These techniques lead to reduced bit rates for transmitting color video at broadcast standards. The performance of adaptive system is much better than that of nonadaptive system. Although the necessary hardware will likely exceed what is needed for a nonadaptive system, the benefits will more than offset the hardware complexity. The effect of channel noise in the adaptive system is investigated in terms of severity and propagation patterns. This is carried out by using a forced error scheme which selectively forces the error to occur in the different types of coding bits. Error propagation patterns are studied by series of computer printouts.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
