US 7,010,045 B2 · Decoder having digital image stabilization function and digital image stabilization method

Abstract

A decoder and a method for preventing and correcting a fluctuated image which occurs due to a user's fluctuated hand when recording using a mobile image communication system by adapting a digital image stabilization technique in a video decoder are provided. When decoding an encoded bit stream by the macro block unit, a motion information is extracted, and one global motion vector is determined using the extracted information. The global motion vector is directed to a motion of a mobile image communication system, and it is possible to obtain a stabilized image by correcting the decoded image data stored in a frame memory using the global motion vector. Since only the motion information is used in the encoded bit stream, a hardware construction is simplified. Therefore, the decoder is well adapted to compute a large amount of data.

Claims15

Dependent claims

A video decoder having a digital image stabilization function, the decoder comprising:

a VLD for separating an image information and an additional information from an encoded bit stream;
a global motion computation unit for extracting a motion vector of a macro block unit from the additional information applied from the VLD, and computing a global motion vector using a local motion vector with respect to a background region in an additional information from the VLD;
a time-based integration unit for extracting a frame type from the additional information, judging whether the global motion vector is integrated according to the extracted frame type to generate a judgment, and integrating a global motion vector from the global motion computation unit based on the judgment;
and
a global motion compensation unit for motion-compensating and stabilizing a recovery image using a global motion vector integrated by the time-based integration unit.

2 more elements

A digital image stabilization method using a video decoder, comprising the steps of:

a separation step for receiving an encoded bit stream and separating into an image information and an additional information;
a computation step for extracting a motion vector of a macro block unit from the additional information applied from the VLD, and computing a global motion vector using a local motion vector concerning the motion of a background region in the additional information separated in the separation step;
an integration step for extracting a frame type from the additional information, judging whether the global motion vector is integrated according to the extracted frame type to generate a judgment, and integrating a global motion vector from the global motion computation unit based on the judgment;
and
a stabilization step for motion-compensating and stabilizing a recovery image using the global motion vector integrated in the integration step.

2 more elements

Dependencies are inferred from the claim text.

Decoder having digital image stabilization function and digital image stabilization method

Life of this patent

Decoder having digital image stabilization function and digital image stabilization method

Life of this patent

Abstract

Claims15