TypeScore: A Text Fidelity Metric for Text-to-Image Generative Models

• URL: http://arxiv.org/abs/2411.02437v1
• Date: Sat, 02 Nov 2024 07:56:54 GMT
• Title: TypeScore: A Text Fidelity Metric for Text-to-Image Generative Models
• Authors: Georgia Gabriela Sampaio, Ruixiang Zhang, Shuangfei Zhai, Jiatao Gu, Josh Susskind, Navdeep Jaitly, Yizhe Zhang,
• Abstract summary: We introduce a new evaluation framework called TypeScore to assess a model's ability to generate images with high-fidelity embedded text. Our proposed metric demonstrates greater resolution than CLIPScore to differentiate popular image generation models.
• Score: 39.06617653124486
• License:
• Abstract: Evaluating text-to-image generative models remains a challenge, despite the remarkable progress being made in their overall performances. While existing metrics like CLIPScore work for coarse evaluations, they lack the sensitivity to distinguish finer differences as model performance rapidly improves. In this work, we focus on the text rendering aspect of these models, which provides a lens for evaluating a generative model's fine-grained instruction-following capabilities. To this end, we introduce a new evaluation framework called TypeScore to sensitively assess a model's ability to generate images with high-fidelity embedded text by following precise instructions. We argue that this text generation capability serves as a proxy for general instruction-following ability in image synthesis. TypeScore uses an additional image description model and leverages an ensemble dissimilarity measure between the original and extracted text to evaluate the fidelity of the rendered text. Our proposed metric demonstrates greater resolution than CLIPScore to differentiate popular image generation models across a range of instructions with diverse text styles. Our study also evaluates how well these vision-language models (VLMs) adhere to stylistic instructions, disentangling style evaluation from embedded-text fidelity. Through human evaluation studies, we quantitatively meta-evaluate the effectiveness of the metric. Comprehensive analysis is conducted to explore factors such as text length, captioning models, and current progress towards human parity on this task. The framework provides insights into remaining gaps in instruction-following for image generation with embedded text.

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