Method for estimating motion using deformable meshes

A motion estimation and grid technology, applied in the field of motion estimation, can solve high cost, expensive and other problems

Inactive Publication Date: 2010-06-16
FRANCE TELECOM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a large number of non-contiguous regions, many of which are encoded differently, there is a high cost involved in encoding the headers of these streams
Moreover, under the framework of variable encoding, this technique is relatively expensive

Method used

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  • Method for estimating motion using deformable meshes
  • Method for estimating motion using deformable meshes
  • Method for estimating motion using deformable meshes

Examples

Experimental program
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Effect test

Embodiment Construction

[0054] Consider a sequence of digital images I(x, y, t), where x and y refer to the coordinates of pixels in the image domain, and t is discrete time, where t is assumed to increase by 1 with each new image in the sequence. The I(x,y,t) value associated with a pixel is usually a brightness value.

[0055] Motion estimation includes: for each point in the image I (x, y, t) whose coordinates are (x, y), generate a displacement vector D (x, y, t) = (d x , d y ), so that it is possible to construct a shifted image I'(x, y, t)=I(x-d x ,y-d x , t-1), the shifted image closely approximates I(x, y, t).

[0056] Calculations are performed over the estimated range Ω, consisting of determining the displacement domain D(x,y,t) such that the function Ф(t) is minimized:

[0057] Φ ( t ) = Σ ( x , y ) ...

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Abstract

The invention concerns a method which consists in analyzing a field of motion of images, estimated by using a first mesh, to detect a faulty area in the first mesh, and in locating a rupture line in said area; then generating a second mesh including a faultless part consisting of meshes of the first mesh outside the faulty area and two sub-meshes which overlap in a region including the rupture line. Each of the two sub-meshes includes respective meshes delimited by nodes including nodes shared with the faultless part, located at the boundary of the faulty area, and additional nodes not belonging to the faultless part, the rupture line being located between the respective nodes of the two sub-meshes shared with the faultless part. Said second mesh is used to finally estimate the field of motion in the group of images concerned.

Description

technical field [0001] The present invention relates to digital processing of moving images, and in particular to a method for motion estimation between successive images of an image sequence. Background technique [0002] Most video coding techniques (especially MPEG-1, 2, 4 and ITU-T H26x) represent motion by means of translations divided into image blocks. This pattern of movement creates many problems. To a large extent, it is responsible for the blockiness commonly seen when decoding with existing video coding techniques, and this motion mode also provides performance mode. [0003] Other modes of athletic performance have been proposed to reduce these deficits. Especially active grids are used in these modes. In this representation mode, motion is represented by means of a defined set of values ​​located on image grid nodes. The motion vector for any point on the image is derived by interpolation techniques based on the values ​​stored on this grid node. Traditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/40H04N7/26
CPCH04N19/006G06T7/2033G06T7/2006H04N19/00648H04N19/00618G06T17/20H04N19/53H04N19/54H04N19/553G06T7/215G06T7/246
Inventor 纳塔莉·卡马斯特凡娜·帕特克斯纳塔莉·洛朗-沙特内
Owner FRANCE TELECOM SA
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