LibGrid

## Pansharpening / Brovey

Pansharpening Method a la Brovey:

• scale RGB up to 15m
• convert RGB to HSV color space
• replace V channel with panchromatic channel
• $V'=Pan$
• convert HSV back to RGB color space

RGB combined with Brovey, 15m

Problem: the panchromatic spectrum from 0.52–0.92$\mu m$ is uncalibrated. This means that it does not only comprise the RGB but also the NIR (near infrared) spectrum → unnatural look.

$Pan = \alpha R + \beta G + \gamma B + \theta NIR + c$

Solution: use linear regression to solve for $\alpha,\beta,\gamma,\theta, c$.