Update README.md

Deleted pre and train folders.
Cleaned out the folder structures and described them below

README.md

@@ -28,37 +28,32 @@ For readability, the directory tree below is shown in a simplified logical form.
 
 ```text
 HSI-SC-NeRF/
-├── wr/                              # White reference (WR) data for spectral calibration
-├── raw/                             # Raw acquisition data
-│   ├── apple_bruised/
-│   ├── maize/
-│   │   ├── Oh43x_gt.MOV             # iPhone-captured video for spatial validation
-│   │   └── Oh43x_SC/                # Raw hyperspectral acquisition data
-│   └── pear/
-├── processed/                       # Preprocessed and NeRF-ready data
-│   ├── apple_bruised/
-│   │   ├── pseudo_rgb/              # Pseudo-RGB images for pose estimation
-│   │   ├── colmap/                  # COLMAP outputs and sparse point clouds
-│   │   ├── hsi_calibrated/          # Spectrally calibrated hyperspectral data
-│   │   └── masks/                   # Object masks for fine-tuning
-│   ├── maize/                       
-│   └── pear/                        
-├── train/                           # Trained NeRF models and checkpoints
-│   ├── apple_bruised/
-│   │   ├── pre-train/               # Pre-trained model checkpoints (`.ckpt`)
-│   │   ├── fine-tune/               # Fine-tuned model checkpoints (`.ckpt`)
-│   │   ├── eval_metrics/            # Evaluation metrics for pre-trained and fine-tuned models
-│   │   └── eval_maps/               # Per-band RMSE or error maps (`.npy`)
-│   ├── maize/                       
-│   └── pear/                       
-└── pcd/                             # Final reconstructed hyperspectral point clouds (1M points)
-    ├── apple_bruised/
-    │   ├── pre-train/
-    │   └── fine-tune/
-    ├── maize/                       
-    └── pear/                        
+├── wr/                              
+├── raw/                                                  
+└── pcd/                             
 ```
 
+## wr/
+
+Contains white reference (WR) data used for spectral calibration.
+
+## raw/
+
+Contains raw acquisition data for three objects:
+
+- Apple (bruised)
+- Maize ear
+- Pear
+
+For each object, the raw hyperspectral acquisition includes .dat, .hdr, and preview image files. In addition, the maize sample includes an iPhone video for spatial validation:
+
+- Oh43x_SC: stationary camera + rotating object (target configuration)
+- Oh43x_gt.MOV: moving camera + stationary object (reference video for spatial validation)
+
+## pcd/
+
+Contains final exported hyperspectral 3D point clouds with 1 million points per object, generated from the pre-trained and fine-tuned models.
+
 ## 🧠 HSI-SC-NeRF Pipeline
 
 The reconstruction workflow consists of three main stages: