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Arbitrary-Scale Image Generation and Upsampling using Latent Diffusion Model and Implicit Neural Decoder


Core Concepts
Proposing a novel method for arbitrary-scale image generation and super-resolution using latent diffusion models and implicit neural decoders.
Abstract
The proposed method combines an auto-encoder, latent diffusion model, and implicit neural decoder to generate images at arbitrary scales with high fidelity, diversity, and fast inference speed. Existing methods suffer from over-smoothing, artifacts, lack of diversity in output images, and scale consistency. The model operates efficiently in the latent space while aligning with the output image space. Extensive experiments show that the proposed method outperforms relevant methods in metrics of image quality, diversity, and scale consistency.
Stats
Most relevant work is IDM [9]. FID scores: CIPS-256 (450), CIPS-1024 (400), MS-PE (350). LIIF shows good PSNR scores but lower perceptual quality. Our model outperforms LIIF at larger scales.
Quotes
"The proposed method adopts diffusion processes in a latent space, thus efficient yet aligned with output image space decoded by MLPs at arbitrary scales." "Our model not only achieves good FID scores on all scales but also shows high consistency." "Our model is significantly faster compared to IDM while showing better output quality."

Deeper Inquiries

How can the proposed method be applied to other domains beyond image generation

The proposed method of using latent diffusion models and implicit neural decoders for arbitrary-scale image generation can be applied to various domains beyond just image generation. One potential application is in video processing, where the model could be used to generate high-resolution frames or enhance the quality of low-resolution videos. Another application could be in medical imaging, where the model could assist in upscaling medical images for better analysis and diagnosis. Additionally, this method could also be utilized in satellite imaging to improve the resolution of satellite images for better mapping and monitoring purposes.

What are potential drawbacks or limitations of using latent diffusion models for image processing

While latent diffusion models offer advantages such as high-quality image synthesis with a flexible range of styles and resolutions, there are some potential drawbacks or limitations associated with using them for image processing. One limitation is that training these models can require significant computational resources due to the complexity of handling large datasets and high-dimensional data representations. Additionally, latent diffusion models may struggle with capturing fine details or textures in images compared to other methods like GANs or regression-based models. There may also be challenges related to interpretability and explainability when working with complex latent spaces generated by these models.

How might the concept of scale consistency impact future developments in computer vision applications

The concept of scale consistency introduced by the proposed method can have significant implications for future developments in computer vision applications. Ensuring scale consistency across different levels of magnification can lead to more robust and reliable image processing algorithms. This consistency allows for seamless transitions between different scales without loss of quality or information, which is crucial for tasks like object recognition, scene understanding, and content creation. By maintaining scale consistency, computer vision systems can provide more accurate results across varying resolutions, enabling better performance in tasks such as super-resolution, object detection at multiple scales, and semantic segmentation on images captured from different sources or devices. Overall, the focus on scale consistency will likely drive advancements towards more versatile and adaptable computer vision systems that can effectively handle diverse input data across a wide range of scales while maintaining high-quality output results.
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