processor: reuse loaded models across pages, use derived images

# Conflicts:
#	qurator/eynollah/processor.py

qurator/eynollah/processor.py

@@ -12,6 +12,8 @@ class EynollahProcessor(Processor):
         return 'eynollah/ocrd-tool.json'
 
     def setup(self) -> None:
+        # for caching models
+        self.models = None
         if self.parameter['textline_light'] and not self.parameter['light_mode']:
             raise ValueError("Error: You set parameter 'textline_light' to enable light textline detection but parameter 'light_mode' is not enabled")
 
@@ -21,14 +23,19 @@ class EynollahProcessor(Processor):
         assert self.parameter
         pcgts = input_pcgts[0]
         page = pcgts.get_Page()
+        # if not('://' in page.imageFilename):
+        #     image_filename = next(self.workspace.mets.find_files(local_filename=page.imageFilename)).local_filename
+        # else:
+        #     # could be a URL with file:// or truly remote
+        #     image_filename = self.workspace.download_file(next(self.workspace.mets.find_files(url=page.imageFilename))).local_filename
         # XXX loses DPI information
-        # page_image, _, _ = self.workspace.image_from_page(page, page_id, feature_filter='binarized')
-        if not('://' in page.imageFilename):
-            image_filename = next(self.workspace.mets.find_files(local_filename=page.imageFilename)).local_filename
-        else:
-            # could be a URL with file:// or truly remote
-            image_filename = self.workspace.download_file(next(self.workspace.mets.find_files(url=page.imageFilename))).local_filename
-        Eynollah(
+        page_image, _, _ = self.workspace.image_from_page(
+            page, page_id,
+            # avoid any features that would change the coordinate system: cropped,deskewed
+            # (the PAGE builder merely adds regions, so afterwards we would not know which to transform)
+            # also avoid binarization as models usually fare better on grayscale/RGB
+            feature_filter='cropped,deskewed,binarized')
+        eynollah = Eynollah(
             self.resolve_resource(self.parameter['models']),
             self.logger,
             allow_enhancement=self.parameter['allow_enhancement'],
@@ -43,6 +50,12 @@ class EynollahProcessor(Processor):
             tables=self.parameter['tables'],
             override_dpi=self.parameter['dpi'],
             pcgts=pcgts,
-            image_filename=str(image_filename)
-        ).run()
+            image_filename=page.imageFilename,
+            image_pil=page_image
+        )
+        if self.models is not None:
+            # reuse loaded models from previous page
+            eynollah.models = self.models
+        eynollah.run()
+        self.models = eynollah.models
         return OcrdPageResult(pcgts)