You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
This paper describes an attempt to broaden the scope of conventional block-based DCT image coding, by allowing some variation in quantization of DCT values for different blocks in the image. Blocks belonging to each individual spatial region in the image are afforded a particular level of quantization selected for that region. This approach allows desirable levels of compression efficiency and visual quality to be achieved for different parts of the reconstructed image. The scheme offers improved overall balancing of fidelity performance, as well as benefits for applications which undertake further processing using the image regions, such as video coding.
The alert did not successfully save. Please try again later.
Anthony John Maeder, Matthew S. Baker, "Region-based DCT image coding scheme," Proc. SPIE 3016, Human Vision and Electronic Imaging II, (3 June 1997); https://doi.org/10.1117/12.274514