Abstract
This paper describes two different schemes of DCT/ DPCM processing of digital NTSC composite video signal. The first scheme (line processing) is based on applying the discrete cosine transform (DCT) along each horizontal line and then implementing the differential pulse code modulation (DPCM) in the vertical direction on the semitransformed image. The second scheme (block processing) involves DCT of (4 × 4) subblocks followed by adaptive DPCM to reduce intersubblock correlation. Based on the statistics of the prediction error, variable bit quantizers optimized for minimizing the mean-square quantization error are developed. These techniques lead to reduced bit rates for transmitting the color video at broadcast standards. Both original and processed color images in composite form are displayed for subjective evaluation. The effects of channel error on block processing are also investigated.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.