Patent ID: 6130913
Filing Date: 2000-10-10
Classification: G06T,H04N

Abstract:
A picture decoding apparatus comprising:a demultiplexing section configured to demultiplex a coded signal into an alpha-map signal for discriminating a picture between an object region and a background region, and a coded picture signal, the alpha-map signal including a reduction ratio setting information signal for reducing an amount of generated codes of the alpha-map signal, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4;an alpha-map decoder section configured to decode the demultiplexed alpha-map signal to separate it into a decoded alpha-map and reduction ratio setting information;a resolution conversion section configured to enlarge the decoded alpha-map signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged alpha-map signal; anda picture decoding section configured to decode the coded picture signal in accordance with the enlarged alpha-map signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal.