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Modelos Tridimensionales Utilizados para la Codificación de Análisis–Síntesis Basada en Objetos

ABSTRACT vídeo a bajos "bit–rates". La compresión de señales de vídeo es indispensable para ofrecer los servicios de videotelefonía y videoconferencia en la Red Digital de Servicios Integrados ISDN ("Inte-grated Services Digital Network"), telefonía celular e in-ternet. Dichos modelos describen los objetos reales a tra-vés de modelos tridimensionales definidos por parámetros de forma, de movimiento y de color. Para señales de vídeo reales (CIF, 10 Hz) y una calidad de imagen de PSNR=38 dB, el modelo de objetos articulados resultó ser un 20% más eficiente que el modelo de objetos rígidos y un 10% más eficiente que el modelo de objetos flexibles.

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    ABSTRACT: An object-based analysis-synthesis coder for coding moving images at low data rates is investigated. The coder is based on the source model of articulated three-dimensional objects. This model describes the real objects by means of model objects defined by shape, motion and color parameters. The model objects may be articulated, i.e. they consist of several rigid object components linked to each other by joints. In this contribution a new algorithm for joint position estimation is presented. First the motion parameters of the connected object components are estimated at different times. For motion estimation a Maximum-Likelihood estimator is applied. Then the position of the joints is determined by evaluating the estimated motion parameters in the equations representing the constraints imposed by the joints on the relative motion of the connected object components. The algorithm was applied to a synthetic test sequence (CIF, 10 Hz). At a camera noise figure of 40 dB a joint position estimation average error of 0.94 pel can be achieved.
    Visual Communications and Image Processing 2000; 01/2000

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