Noise removal from images

#1

I get indexing error while executing defining the function

how to fix the issue?

Untitled5 - Opera 13-04-2026 12_10_40
Untitled5 - Opera 13-04-2026 12_10_401920×1020 148 KB

#2

Untitled5 - Opera 13-04-2026 12_10_30
Untitled5 - Opera 13-04-2026 12_10_301920×1020 139 KB