This document discusses research challenges in real-time multimedia monitoring in large-scale wireless multimedia sensor networks. It describes how these networks enable new monitoring applications but face challenges due to limited computational and energy resources. The document outlines solutions needed at the MAC, network, and transport layers to efficiently deliver visual data while meeting requirements for steady data flows and delay-bounded delivery. It also discusses challenges in areas like multimedia coding, in-network processing, energy harvesting, and cross-layer optimization across the protocol stack.