feat(scan): support iX1600 duplex scanning on Linux

agents/fedeo-device-agent/scripts/scan_document.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""Assemble ordered scanner pages; OpenCV is optional, PDF creation is not."""
+import argparse
+import json
+from pathlib import Path
+
+from PIL import Image
+
+
+def create_document(inputs, output, resolution, use_postprocess=False, profile="document", strict=False):
+    if not inputs:
+        raise ValueError("Keine Seiten vorhanden")
+    output = Path(output)
+    file_format = {".pdf": "PDF", ".png": "PNG", ".tiff": "TIFF"}.get(output.suffix.lower())
+    if not file_format:
+        raise ValueError("Unbekanntes Ausgabeformat")
+    if file_format != "PDF" and len(inputs) != 1:
+        raise ValueError("Mehrseitige Scans benötigen PDF als Ausgabeformat")
+
+    warnings = []
+    processor = None
+    if use_postprocess:
+        try:
+            from opencv_postprocess import postprocess
+            processor = postprocess
+        except ImportError:
+            if strict:
+                raise
+            warnings.append("OpenCV fehlt; alle Seiten wurden ohne Bildkorrektur übernommen.")
+
+    partial = output.with_name(output.name + ".partial")
+    try:
+        for index, input_path in enumerate(inputs):
+            input_path = Path(input_path)
+            image_path = input_path
+            corrected = input_path.with_name(input_path.stem + ".corrected.png")
+            if processor:
+                try:
+                    processor(input_path, corrected, profile)
+                    image_path = corrected
+                except Exception:
+                    if strict:
+                        raise
+                    warnings.append(f"Seite {index + 1}: Bildkorrektur fehlgeschlagen; Rohscan übernommen.")
+
+            # Only one decoded page is kept in memory, even for large duplex stacks.
+            with Image.open(image_path) as image:
+                with image.convert("RGB") as rgb:
+                    if file_format == "PDF":
+                        rgb.save(partial, "PDF", resolution=resolution, quality=90, append=index > 0)
+                    else:
+                        rgb.save(partial, file_format, dpi=(resolution, resolution))
+            corrected.unlink(missing_ok=True)
+        partial.replace(output)
+    finally:
+        partial.unlink(missing_ok=True)
+
+    return {"pageCount": len(inputs), "warnings": warnings}
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Scan-Seiten zu einer Datei zusammenführen")
+    parser.add_argument("--inputs", nargs="+", required=True)
+    parser.add_argument("--output", required=True)
+    parser.add_argument("--resolution", type=float, required=True)
+    parser.add_argument("--profile", choices=["document", "receipt", "raw"], default="document")
+    parser.add_argument("--postprocess", action="store_true")
+    parser.add_argument("--strict", action="store_true")
+    args = parser.parse_args()
+    print(json.dumps(create_document(args.inputs, args.output, args.resolution, args.postprocess, args.profile, args.strict)))
+
+
+if __name__ == "__main__":
+    main()