US 5,859,667 A · Hierarchical encoding and decoding apparatus for a digital image signal

Abstract

In a hierarchical encoding apparatus, predictors each including a look-up table are used to form predicted signals for respective hierarchical levels. The difference between the predicted signal and the original signal forms the differential signal for the higher hierarchical levels. The look-up table contains either predictive coefficients which are used as weights for pixels of a signal in one hierarchical level to produce a signal at a higher hierarchical level, or representative values which are combined with a dynamic range and redundant component in a set of pixels of a signal in one hierarchical level to produce a signal at a higher hierarchical level. The values in the look-up table are obtained from representative images.

Claims14

Dependent claims

An apparatus for encoding a first digital image signal having a first resolution, comprising:

first filtering means for filtering said first digital image signal to provide a second digital image signal having a second resolution which is lower than said first resolution;
second filtering means for filtering said second digital image signal to provide a third digital image signal having a third resolution which is lower than said second resolution;
predicting means, including class categorizing means, for processing reference pixels of said third digital image signal to produce a class code and to produce a predicted signal at said first resolution from said reference pixels and said class code;
and
means for subtracting said predicted signal from said first digital image signal to produce a differential signal.

2 more elements

Dependencies are inferred from the claim text.

Hierarchical encoding and decoding apparatus for a digital image signal

Life of this patent

Hierarchical encoding and decoding apparatus for a digital image signal

Life of this patent

Abstract

Claims14