Unsupervised monocular depth estimation has received widespread attention because of its capability to train without ground truth. In real-world scenarios, the images may be blurry or noisy due to the influence of weather conditions and inherent limitations of the camera. Therefore, it is particularly important to develop a robust depth estimation model. Benefiting from the training strategies of generative networks, generative-based methods often exhibit enhanced robustness. In light of this, we employ a well-converging diffusion model among generative networks for unsupervised monocular depth estimation. Additionally, we propose a hierarchical feature-guided denoising module. This model significantly enriches the model's capacity for learning and interpreting depth distribution by fully leveraging image features to guide the denoising process. Furthermore, we explore the implicit depth within reprojection and design an implicit depth consistency loss. This loss function serves to enhance the performance of the model and ensure the scale consistency of depth within a video sequence. We conduct experiments on the KITTI, Make3D, and our self-collected SIMIT datasets. The results indicate that our approach stands out among generative-based models, while also showcasing remarkable robustness.

利用生成网络的训练策略，我们提出了一种在无监督单目深度估计中具有鲁棒性的扩散模型，并采用分层特征引导的去噪模块来丰富模型的学习能力，进一步探索了图像重投影中的隐式深度，并设计了一种隐式深度一致性损失，从而提高了模型的性能和深度在视频序列中的尺度一致性。实验证明，我们的方法在生成网络模型中脱颖而出，并且具有显著的鲁棒性。

基于层次特征引导扩散的无监督单目深度估计