Joint image filters leverage the guidance image as a prior and transfer the
structural details from the guidance image to the target image for suppressing
noise or enhancing spatial resolution. Existing methods either rely on various
explicit filter constructions or hand-designed objective functions, thereby
making it difficult to understand, improve, and accelerate these filters in a
coherent framework. In this paper, we propose a learning-based approach for
constructing joint filters based on Convolutional Neural Networks. In contrast
to existing methods that consider only the guidance image, the proposed
algorithm can selectively transfer salient structures that are consistent with
both guidance and target images. We show that the model trained on a certain
type of data, e.g., RGB and depth images, generalizes well to other modalities,
e.g., flash/non-Flash and RGB/NIR images. We validate the effectiveness of the
proposed joint filter through extensive experimental evaluations with
state-of-the-art methods.

本研究提出了一种学习性方法，基于卷积神经网络构建联合滤波器，该算法可以选择性地传输与指导和目标图像一致的重要结构，验证表明该联合滤波器在抑制噪声或增强空间分辨率方面具有有效性，并且具有与现有最先进方法相当的性能。