Add mean and std of training set image pixels

README.md

@@ -13,7 +13,7 @@ size_categories:
 This dataset contains images of various types of Hymenoptera. The set is split into a training set of 245 images and a validation set with 153 images. It can be used 
 for image classification training.
 
-Folder Structure
+### Folder Structure
 ```
 ├── train/
 │   ├── ants/
@@ -23,5 +23,13 @@ Folder Structure
     └── bees/
 ```
 
+### Useful Statistics
+
+Average pixel values for each color channel (RGB) for all images in the training set. <br>
+`mean: [0.5172, 0.4753, 0.3484]`
+
+Standard deviation of pixel values for each color channel (RGB) for all images in the training dataset. <br>
+`std: [0.2776, 0.2575, 0.2865]`
+
 
 **Dataset citation:** Elsik, C. G., Tayal, A., Diesh, C. M., Unni, D. R., Emery, M. L., Nguyen, H. N., Hagen, D. E. Hymenoptera Genome Database: integrating genome annotations in HymenopteraMine. Nucleic Acids Research, 2016, Jan. 4; 44(D1):D793-800. DOI: 10.1093/nar/gkv1208. Epub 2015, Nov. 17. PubMed PMID: 26578564.