Fig. 3: Quartile-based thresholding for high-entropy block identification.
From: The East Asian transmission of Southern Song Zen Buddhist painting base on compositional perspective
Blocks were ranked by entropy value and segmented into quartiles (Q1−Q4). Blocks within the upper quartile (Q4) were designated as high-entropy regions and interpreted as probable subject-dominant zones. Color intensity corresponds to entropy magnitude, with warmer tones indicating higher information density.
