Synthesis and Perceptual Scaling of High Resolution Naturalistic Images Using Stable Diffusion

TL;DR

This paper introduces a method using Stable Diffusion XL to generate high-resolution, naturalistic images with gradual perceptual transitions, enabling detailed studies of perception, attention, and memory.

Contribution

It extends generative models for creating customizable, perceptually continuous naturalistic images, validated by human perceptual similarity and memory confusability tests.

Findings

Generated 108 object scenes with 10 variants each along perceptual continua.

Perceptual ordering predicted by machine learning aligns with human judgments.

Ordering of stimuli influences confusability in working memory tasks.

Abstract

Naturalistic scenes are of key interest for visual perception, but controlling their perceptual and semantic properties is challenging. Previous work on naturalistic scenes has frequently focused on collections of discrete images with considerable physical differences between stimuli. However, it is often desirable to assess representations of naturalistic images that vary along a continuum. Traditionally, perceptually continuous variations of naturalistic stimuli have been obtained by morphing a source image into a target image. This produces transitions driven mainly by low-level physical features and can result in semantically ambiguous outcomes. More recently, generative adversarial networks (GANs) have been used to generate continuous perceptual variations within a stimulus category. Here we extend and generalize this approach using a different machine learning approach, a text-to-image diffusion model (Stable Diffusion XL), to generate a freely customizable stimulus set of photorealistic images that are characterized by gradual transitions, with each image representing a unique exemplar within a prompted category. We demonstrate the approach by generating a set of 108 object scenes from 6 categories. For each object scene, we generate 10 variants that are ordered along a perceptual continuum. This ordering was first estimated using a machine learning model of perceptual similarity (LPIPS) and then subsequently validated with a large online sample of human participants. In a subsequent experiment we show that this ordering is also predictive of confusability of stimuli in a working memory experiment. Our image set is suited for studies investigating the graded encoding of naturalistic stimuli in visual perception, attention, and memory.