Engaging students in real-world learning contexts has been identified by educators as being an important way of helping them learn to apply what they have learned from textbooks to practical problems. The advancements in mobile and image-processing technologies have enabled students to access learning resources and receive learning guidance in real-world contexts. However, when interacting with such a rich information environment that contains real-world and virtual-world learning resources, students might feel confused and frustrated owing to the lack of appropriate instructional design. Therefore, in this study, an image recognition-based mobile learning system with an active learning-promoting mechanism was developed for supporting field trips for local culture courses. An experiment was executed to examine the effects of the proposed approach on students' learning achievement, learning motivation, and local culture identity. Moreover, the students' learning behavioral patterns were probed. The experimental results showed that the proposed approach not only improved the students' learning achievements as well as their learning motivation and local culture identity, but the students who learned with the proposed approach also demonstrated more active behavioral patterns than those who learned without the active learning-promoting mechanism. Based on the findings of this study, some recommendations for those who plan to develop effective learning strategies for conducting AR-based mobile learning activities are proposed.