🚧 Add a script that checks FULLTEXT dimensions against BEST dimensions

check-FULLTEXT-Page-dimensions-vs-BEST-dimensions.py

@@ -0,0 +1,47 @@
+"""Check FULLTEXT ALTO page dimensions against BEST image dimensions"""
+
+import PIL.Image
+import sys
+from ocrd.workspace import Workspace
+from ocrd.resolver import Resolver
+from lxml import etree as ET
+
+
+def alto_namespace(tree):
+    """
+    Return the ALTO namespace used in the given ElementTree.
+
+    This relies on the assumption that, in any given ALTO file, the root
+    element has the local name "alto". We do not check if the files uses any
+    valid ALTO namespace.
+    """
+    root_name = ET.QName(tree.getroot().tag)
+    if root_name.localname == 'alto':
+        return root_name.namespace
+    else:
+        raise ValueError('Not an ALTO tree')
+
+
+exit_code = 0
+workspace = Workspace(Resolver(), '.')
+
+for n, page_id in enumerate(workspace.mets.physical_pages):
+    gt_file = workspace.mets.find_files(fileGrp='FULLTEXT', pageId=page_id)[0]
+    img_file = workspace.mets.find_files(fileGrp='BEST', pageId=page_id)[0]
+    gt_file = workspace.download_file(gt_file)
+    img_file = workspace.download_file(img_file)
+
+    tree = ET.parse(gt_file.local_filename)
+    nsmap = {'alto': alto_namespace(tree)}
+    alto_page = tree.find('//alto:Page', namespaces=nsmap)  # one page assumed
+    gt_size = int(alto_page.attrib['WIDTH']), int(alto_page.attrib['HEIGHT'])
+
+    img_size = PIL.Image.open(img_file.local_filename).size
+
+    if gt_size == img_size:
+        print('OK', page_id)
+    else:
+        print('ERR', page_id, gt_size, '!=', img_size)
+        exit_code = 1
+
+sys.exit(exit_code)

requirements-ppn2ocr.txt

@@ -1,3 +1,4 @@
 requests
 lxml
 click
+ocrd