US 2002/0172428 A1 · ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND RECORDING MEDIUM

Abstract

A device and method of the present invention aims to improve encoding efficiency. A low level picture is encoded based on predetermined picture elements in an input picture. Picture elements of a middle level picture are half the picture elements of the input picture. The other half of the picture elements are occupied by the low level picture. Because the low level picture has been already encoded, upon encoding the middle level picture, the picture elements which must be actually encoded are only half the picture elements of the middle level picture. Picture elements of a high level picture are an entire of the input picture elements. Half of them are picture elements of the middle level picture or low level picture. Because the low level picture and the middle level picture have been already encoded, the picture elements which must be actually encoded to encode the high level picture are only half the picture elements of the high level picture.

Claims22

Dependent claims

An encoding device comprising an encoder for hierarchically encoding an input binary picture in terms of spatial resolution and an output portion for outputting an encoded code,

said encoder further comprising:
a first encoding means for encoding a picture of a first level composed of picture elements at a predetermined position on an input picture;
and
a second encoding means for encoding a picture of a second level which is higher than said first level,
said picture of the second level being said input picture and said second encoding means encoding only picture elements excluding the picture elements of said first level picture, of the picture elements of said second level pictures.

2 more elements

A binary picture interpolating device for receiving the binary picture and outputting a high resolution binary picture obtained by interpolating the input picture in terms of spatial resolution,

said binary picture interpolating device comprising:
a storing means for storing picture elements whose values are already calculated;
and
an interpolating means for obtaining a value of a picture element located in the center among picture elements whose values are already calculated, by repeating calculation recursively by interpolation from the picture elements whose values are already calculated and stored in said storing means.

1 more element

Dependencies are inferred from the claim text.

Encoding device and method, decoding device and method, and recording medium

Life of this patent

Encoding device and method, decoding device and method, and recording medium

Life of this patent

Abstract

Claims22