Update README.md

README.md

@@ -15,7 +15,11 @@
 
 
 ## About
-`Caliscope` is a GUI-based multicamera calibration package that integrates with 2D landmark tracking tools to produce low-cost, open-source motion capture.
+`Caliscope` is a GUI-based multicamera calibration package. When the intrinsic (focal length, optical center, and distortion) as well as extrinsic (relative rotation and translation) properties of a set of cameras are known, synchronized frames from those cameras can be used to triangulate landmarks indentified across their multiple points of view. With more cameras, this 3D tracking becomes more robust to occlusion and the inevitable errors in 2D landmark tracking and estimated camera properties.
+
+Unfortunately, while OpenCV provides straightforward functions for the estimation of single camera intrinsic properties as well as estimates of the extrinsic properties of two cameras, there is no straightforward way to estimate extrinsic properties for more than two cameras. Performing this requires [bundle adjustment](https://scipy-cookbook.readthedocs.io/items/bundle_adjustment.html), which demands an extensive series of computational steps and intermediate data tracking.
+
+Caliscope is intended to automate this more complex calibration function along with providing visual feedback regarding parameter estimates at each stage of processing. Additionally, there are sample implementations of a Tracker class using Google's Mediapipe that demonstrate the capacity to integrate the full calibration results with landmark tracking tools to achieve 3D pose estimation. While Mediapipe pose estimation has limitations regarding accuracy and precision, it demonstrates a data processing pipeline that can easily integrate more powerful tracking tools as they emerge.
 
 Please see our [docs](https://mprib.github.io/caliscope/) for details about installation, project setup, and general workflow.