Reviews: Learnable Visual Markers

Briefly, the overall idea of serializing the whole encoding--environment simulation--recognition into an end-to-end network is interesting and worth exploration. The presentation is clear and comprehensive. To me, however, there is still large room to fulfill the idea and its application possibility. Specifically, more experiments should have been done to support and demonstrate the idea. The end-to-end learning is intuitive and proved effective, at least qualitatively, but the model structure binds the synthesizer and the recognizer together, assuming that we already know the recognizer in the first place. In real situations, the two parts are mostly fully decoupled, and this structure limits its applications.