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I-Filtrado: Filtrado implícito para el aprendizaje de funciones de distancia neural de nubes de puntos 3D

Shengtao Li, Yudong Liu, Ge Gao

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    Resumen
    Este resumen es generado por máquina.

    Este estudio introduce un nuevo filtro implícito para funciones neuronales implícitas, mejorando la preservación de detalles geométricos en la reconstrucción de formas a partir de nubes de puntos. El método mejora la precisión de la superficie y se extiende a tareas como la reconstrucción de vista dispersa.

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    Área de la Ciencia:

    • Visión por computadora
    • Gráficos por computadora
    • Aprendizaje profundo geométrico

    Sus antecedentes:

    • Las funciones neuronales implícitas como las funciones de distancia firmadas (SDF) y las funciones de distancia no firmadas (UDF) sobresalen en el ajuste de la geometría de la forma.
    • Inferir campos de distancia continuos de nubes de puntos discretas y no orientadas sigue siendo un desafío, que a menudo resulta en superficies ásperas que omiten detalles geométricos finos.

    Objetivo del estudio:

    • Proponer un nuevo filtro implícito no lineal para suavizar los campos implícitos mientras se conservan los detalles geométricos de alta frecuencia.
    • Extender el filtrado implícito a conjuntos de nivel no cero para una regularización consistente del conjunto de nivel cero.
    • Adaptar el método de filtrado para los UDF utilizando un esquema de entrenamiento inmutable de gradiente y mejorar la reconstrucción de visión dispersa.

    Principales métodos:

    • Se propone un filtro implícito no lineal para suavizar el campo implícito mediante el filtrado de la superficie (conjunto de nivel cero) utilizando puntos vecinos y gradientes del SDF.
    • El filtrado se extiende a conjuntos de niveles distintos de cero moviendo las nubes de puntos de entrada a lo largo del gradiente, asegurando la consistencia entre los conjuntos de niveles.
    • Se desarrolla un esquema de entrenamiento inmutable de gradiente para aplicar el filtro a los UDF, abordando la no diferenciabilidad en el conjunto de nivel cero.

    Principales resultados:

    • El método de filtrado implícito propuesto suaviza eficazmente los campos implícitos conservando al mismo tiempo detalles geométricos finos como los bordes y las esquinas.
    • El método demuestra un rendimiento mejorado en la reconstrucción de superficies a partir de objetos, escenas complejas e imágenes de múltiples vistas.
    • Se observan mejoras significativas en la reconstrucción de visión dispersa, la estimación normal de puntos y las tareas de muestreo de nubes de puntos en comparación con los métodos más avanzados.

    Conclusiones:

    • El nuevo filtro implícito mejora la precisión y la preservación de detalles de las funciones neuronales implícitas para la representación de formas en 3D.
    • El esquema de entrenamiento inmutable de gradiente adapta con éxito la técnica de filtrado para los UDF, ampliando su aplicabilidad.
    • El método ofrece una solución robusta para varias tareas de aprendizaje profundo geométrico, incluida la reconstrucción, la estimación normal y el upsampling.