SLAM虽然小复杂，但对于开发者而言，ar sdk通常会解决这个问题。
所以相对于识别，跟踪是个看上去高大上但实则不需要关注细节的部分。
识别，要技术深耕；跟踪，需行业深耕。
在此了解下常见的ar sdk with v-slam：
- 8 Best augmented reality SDK for AR development for iOS and Android in 2017
- TOP 10 AR SDK for iOS and Android Development
阅读笔记
| Vuforia | EasyAR | Wikitude | ARToolKit | Kudan | MaxST | Xzimg | NyARToolKit | |
| Maximum distance capturing / holding marker (m) | 1.2 / 3.7 | 0.9 / 2.7 | 0.8 / 3 | 3 / 3 | 0.8 / 3 | 0.5 / 0.9 | 0.7 / 5 | 0.7 / 1 |
| Recognition stability of immovable marker | 10 | 7 | 6 | 8 | 10 | 7 | 8 | 5 |
| Recognition stability of movable marker | 6 | 3 | 4 | 6 | 6 | 2 | 7 | 3 |
| Minimum angle recognition | 30 | 35 | 40 | 10 | 30 | 50 | 35 | 45 |
| Minimum visibility for recognition overlapped marker | 20% | 10% | 30% | 100% | 25% | 50% | 10% | 75% |
| 2D Recognition | ✓ | ✓ | ✓ | ✓ (bordered) | ✓ | ✓ | ✓ | ✓ |
| 3D Recognition | ✓ | – | ✓ (beta) | – | ✓ | ✓ | – | – |
| Geo-Location | – | – | ✓ | – | – | – | – | – |
| Cloud Recognition | ✓ | – | ✓ | – | – | – | – | – |
| SLAM | – | – | ✓ | – | ✓ | ✓ | – | – |
| Total (rating) | 7.1 | 4.4 | 7.5 | 2.8 | 6.9 | 5.2 | 4.7 | 3.1 |
EasyAR2.0有SLAM
Planar Tracker: Using the same algorithms in our image tracker, we can also track unprepared planes. Just similar to SLAM technology used by Apple ARKit.
【需测试】