CG-MedSAM | Contrast-Gated Skin Lesion Segmentation Demo

1. Curated Benchmark Samples

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Drag & drop lesion image or browse

Supports PNG, JPG, WebP up to 25MB

CG-Adapter (Ours) Top Robustness

Contrast-gated PEFT (4.64% weights, ΔE*ab modulation)

Standard Adapter 4.64% Weights

Bottleneck Adapter with static constant factor (γ = 1.0)

LoRA (r=16) 4.93% Weights

Low-Rank Adaptation injected on query/value projections

Decoder-Only 4.33% Weights

Tuned mask decoder with frozen ViT-B image encoder

Core Proxy (C_core) Background Ring (R_ring)

Drag on image to draw bounding box, or drag corners to adjust

Zero-Leakage

Perceptual Color Distance ΔE*_ab

-- Lab units

0.0 (Minimal) 28.5 (μ) 60.0+ (High)

Low ΔE*ab indicates high boundary ambiguity in dark or low-contrast lesions.

Dynamic Adapter Gate γ Factor

1.00× Nominal

γ = 2.0 × σ(W₂ ReLU(W₁ c + b₁) + b₂)

Modulates adapter residual scaling according to localized optical difficulty.

Perilesional Skin Tone Fitzpatrick Scale

Awaiting Analysis...

Skin Luminance (L*) --

ITA° Angle --

Segmentation Properties Morphometry

Area -- px

Coverage -- %

Prompt Type --

Backend PyTorch