add missing file

xlib/image/misc.py

@@ -0,0 +1,17 @@
+import numpy as np
+
+def get_NHWC_shape(img : np.ndarray):
+    """
+    returns NHWC shape where missed dims are 1
+    """
+    ndim = img.ndim
+    if ndim not in [2,3,4]:
+        raise ValueError(f'img.ndim must be 2,3,4, not {ndim}.')
+
+    if ndim == 2:
+        N, (H,W), C = 1, img.shape, 1
+    elif ndim == 3:
+        N, (H,W,C) = 1, img.shape
+    else:
+        N,H,W,C = img.shape
+    return N,H,W,C