  Extracting meaningful entities belonging to predefined categories from
Visually-rich Form-like Documents (VFDs) is a challenging task. Visual and
layout features such as font, background, color, and bounding box location and
size provide important cues for identifying entities of the same type. However,
existing models commonly train a visual encoder with weak cross-modal
supervision signals, resulting in a limited capacity to capture these
non-textual features and suboptimal performance. In this paper, we propose a
novel \textbf{V}isually-\textbf{A}symmetric co\textbf{N}sisten\textbf{C}y
\textbf{L}earning (\textsc{Vancl}) approach that addresses the above limitation
by enhancing the model's ability to capture fine-grained visual and layout
features through the incorporation of color priors. Experimental results on
benchmark datasets show that our approach substantially outperforms the strong
LayoutLM series baseline, demonstrating the effectiveness of our approach.
Additionally, we investigate the effects of different color schemes on our
approach, providing insights for optimizing model performance. We believe our
work will inspire future research on multimodal information extraction.
