US 5,862,261 AGranted

Current frame prediction method and apparatus for use in an image signal encoding system

AssigneeDaewoo Electronics Co., Ltd.

InventorMin-Sup Lee

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Abstract

An apparatus for predicting a current frame signal included in an image signal based on a reference frame first detects a panning vector representing a spatial displacement between the current and the reference frames. Once the panning vector is detected, a predicted frame containing a substitutable region and an unsubstitutable region is determined based on the panning vector and the reference frame, and then an amplitude of the panning vector is compared with a reference value. Subsequently, a predicted current frame signal is generated as the result of the current frame prediction process in response to the result of the comparison. If the amplitude of the panning vector is smaller than the reference value, the predicted current frame signal is produced by padding pixel values of the substitutable region which are located along a boundary between the substitutable region and the unsubstitutable region into the unsubstitutable region. Meanwhile, if the amplitude of the panning vector is greater than or equal to the reference value, the predicted current frame signal is created by using a block matching technique for the unsubstitutable region based on the current and the reference frame signals.

Claims16

Dependent claims

A method, for use in an image signal encoding system, for generating a predicted current frame signal based on a current frame and a reference frame, wherein the current and the reference frames are included in an image signal having a sequence of frames, comprising the steps of:

(a) detecting a panning vector representing a spatial displacement between the current and the reference frames;
(b) determining a predicted frame containing a substitutable region and an unsubstitutable region based on the panning vector and the reference frame, wherein the substitutable region has pixel values selected from the reference frame and the unsubstitutable region has none of pixel values;
(c) comparing a reference value with an amplitude of the panning vector;
and
(d) generating the predicted current frame signal according to the result of the step (c) based on the predicted frame and the current and the reference frames, said step (d) includes the steps of:
(d1) producing, if the amplitude of the panning vector is smaller than the reference value, the predicted current frame signal by padding pixel values of the substitutable region which are located along a boundary between the substitutable region and the unsubstitutable region into the unsubstitutable region;
and
(d2) creating, if the amplitude of the panning vector is greater than or equal to the reference value, the predicted current frame signal by using a block matching technique for the unsubstitutable region based on the current and the reference frame signals.

5 more elements

An apparatus, for use in an image signal encoding system, for generating a predicted current frame signal based on a current frame and a reference frame, wherein the current and the reference frames are included in an image signal having a sequence of frames, which comprises:

means for detecting a panning vector representing a spatial displacement between the current and the reference frames;
means for determining a predicted frame containing a substitutable region and an unsubstitutable region based on the panning vector and the reference frame, wherein the substitutable region has pixel values selected from the reference frame and the unsubstitutable region has none of pixel values;
means for providing selection information by comparing a reference value with an amplitude of the panning vector;
means for generating a first predicted current frame signal by padding pixel values within the substitutable region into the unsubstitutable region within the predicted frame;
means for producing a second predicted current frame signal by using a block matching technique for the unsubstitutable region based on the panning vector and the current and reference frame signals;
and
means for selecting, in response to the selection information, either the first predicted current frame signal or the second predicted current frame signal as the predicted current frame signal.

4 more elements

Dependencies are inferred from the claim text.