Add simple script to inspect feature files

Author: andsild

tools/inspect_image_feature_file.py

@@ -0,0 +1,37 @@
+'''
+This script will open a feature file (.h5) and show a 3x3 grid of images.
+This tool is useful if you suspect that features are not extracted properly, for example due to erroneous mask values/indexing.
+'''
+
+import h5py
+import matplotlib.pyplot as plt
+import numpy as np
+import sys
+
+if len(sys.argv) > 0:
+    feature_file = sys.argv[1]
+else:
+    feature_file = "features.h5"
+
+# open the file
+with h5py.File(feature_file, "r") as f:
+    # get the images dataset
+    images = f["images"]
+    # get the first 9 images
+    images = images[:9]
+    # reshape the images to 3x3
+    #images = np.reshape(images, (3,3,100,100,3))
+    # transpose the images to 3x3
+    #images = np.transpose(images, (0,2,1,3,4))
+    # flatten the images to 9x100x100x3
+    #images = np.reshape(images, (9,100,100,3))
+
+    # hide axis from pyplot
+    plt.axis('off')
+
+    # plot the images
+    for i in range(9):
+        plt.subplot(3,3,i+1)
+        plt.imshow(images[i])
+    plt.show()
+    print(f"Image {i+1} is {images[i].shape}")