PAN
Image

Low Frequency
P

High Frequency
P

Feature Maps

Low Frequency
Fusion

Fused Low
Frequency

Feature Map
Fusion

Fused Feature
Map

MS Image

GS Transform

First Component
GS1

Other Components
GS2,...,GSn

Low Frequency
GS

High Frequency
GS

Feature Maps

Fused GS

Inverse
GS Transform

Fused HR Image

Fused High
Frequency