Update README.md

README.md

@@ -10,6 +10,6 @@ As a side note, If you are interested in the checkerboard corner detection with
 
 You can see the follow-up paper of this article  [Automatic checkerboard detection for camera calibration](https://ieeexplore.ieee.org/document/9428389)  (ICME 2021 oral)
 
--- This dataset includes three public dataset: GoPro, Mesa, uEye, which is original from [ROCHADE: Robust Checkerboard Advanced Detection for Camera Calibration](https://link.springer.com/chapter/10.1007/978-3-319-10593-2_50) (ECCV 2014 oral)
+-- This dataset includes three public sub-datasets:  **GoPro (100 images)**, **Mesa (206 images)** and **uEye (206 images)**, original from [ROCHADE: Robust Checkerboard Advanced Detection for Camera Calibration](https://link.springer.com/chapter/10.1007/978-3-319-10593-2_50) (ECCV 2014 oral)
 
-**If you use this dataset, please cite our three articles. Thanks.**
+**If you use this dataset, please cite these three articles. Thanks.**