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Method of representing a sequence of pictures using 3d models, and corresponding devices and signal

A three-dimensional model and screen technology, which is applied in the fields of digital video signal modification, image communication, instruments, etc., can solve problems such as inappropriateness, and achieve the effect of improving redundancy.

Inactive Publication Date: 2006-07-19
FRANCE TELECOM SA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0046] Another disadvantage of this prior art is that although it is oriented towards coding (unlike the other methods described above in this paper), it is only scalable from a picture texture point of view and not geometrically
[0047] Therefore, this method is not suitable for implementation on display terminals with a very wide variety of processing capabilities or transmission networks with variable bit rates

Method used

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  • Method of representing a sequence of pictures using 3d models, and corresponding devices and signal
  • Method of representing a sequence of pictures using 3d models, and corresponding devices and signal
  • Method of representing a sequence of pictures using 3d models, and corresponding devices and signal

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Embodiment Construction

[0111] The general principle of the invention is based on extracting a corresponding 3D model stream of vertices associated with an irregular grid, adapted to the content of the picture sequence and taking into account the irregular grid of the previous 3D model.

[0112] refer to Figure 4 , one can simply recall the general principle of reconstructing a video sequence with the aid of a 3D model.

[0113] We study a real scene, in which case an object 41 (teapot in this text) is photographed (42) by a camera 43 . No assumptions are made about the nature of the camera, which may be a mass-produced consumer product, nor about the acquisition parameters of the video sequence.

[0114] After the video sequence has been digitized 44, a sequence of pictures 45 called the original sequence is obtained.

[0115] By analysis 46 of this raw sequence, at least one 3D model 47 (of a plurality of 3D models according to the invention) is created from which a sequence of pictures 49 can b...

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Abstract

The invention relates to a method of representing a sequence of pictures which are grouped into sets comprising at least two successive pictures, known as groups of pictures (GOP), whereby a textured, meshed three-dimensional model is associated with each of said GOPs. According to the invention, the three-dimensional model associated with the n level GOP is represented with an irregular mesh taking account of at least one vertex of at least the irregular mesh representing the three-dimensional model that is associated with the n-1 level GOP, said vertex being known as the common vertex.

Description

technical field [0001] The field of the invention is the coding of sequences of pictures (or images). More specifically, the present invention relates to a technique for encoding a picture sequence by a three-dimensional model or a 3D model stream. Background technique [0002] We recall that video coding via 3D models consists in representing a video sequence via one or more 3D textured models. The information sent to the frame sequence encoder includes the 3D model, the texture frame associated with the 3D model, and the parameter set of the camera that captured the sequence. [0003] This type of encoding can thus achieve lower bit rates than conventional encoding techniques in which a video sequence is usually represented in sets of pixels, which are much more expensive to transmit. [0004] In addition, this technique of encoding through a 3D model can add certain functions to the reconstructed sequence compared to conventional encoding techniques. Thereby it is poss...

Claims

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Application Information

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IPC IPC(8): H04N7/26G06T9/00
CPCH04N19/00945H04N19/0029H04N19/00781G06T9/001H04N19/004H04N19/00418H04N19/00284H04N19/0026H04N7/26659H04N19/00593H04N19/00H04N19/00412H04N19/17H04N19/177H04N19/179H04N19/23H04N19/27H04N19/29H04N19/527H04N19/61H04N19/90G06T19/00
Inventor 拉尔夫勒·巴尔特帕特里克·基奥亚
Owner FRANCE TELECOM SA
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