A method and apparatus for encoding an original image. The original image is divided into a plurality of regions and a region is selected therefrom for processing. A region energy value is determined in accordance with the magnitudes of the pixels in the selected region. The region energy value is compared...http://www.google.com.au/patents/US5305103?utm_source=gb-gplus-sharePatent US5305103 - Method and apparatus for improved pyramidal image encoding
