diff --git a/src/main.js b/src/main.js
index a1c16d5..315bbec 100644
--- a/src/main.js
+++ b/src/main.js
@@ -4,6 +4,7 @@ import { startCamera, grabFrame, imageDataFromFile } from './camera.js';
 import { decodeBarcodes } from './barcode.js';
 import { runOcr, isOcrAvailable } from './ocr.js';
 import { recognize } from './pipeline.js';
+import { normalizeToken } from './spec.js';
 import {
   createSession, proposeAssignment, commitAssignment,
   undoLast, moveEntry, removeEntry, nextStackId,
@@ -88,9 +89,21 @@ async function processCapture(getFrame) {
 
   try {
     const frame = await getFrame();
-    const { spec, source, confidence } = await recognize(frame, { decodeBarcodes, runOcr });
+    // Ist einer der gleich gelesenen Codes bereits einem Stapel dieser
+    // Sitzung bekannt, kann die Pipeline die bis zu 20 Sekunden dauernde
+    // Texterkennung ueberspringen (siehe recognize() in pipeline.js).
+    const isKnownCode = (code) => {
+      const normalized = normalizeToken(code);
+      return targetSession.stacks.some(
+        (stack) => Array.isArray(stack.codes) && stack.codes.includes(normalized),
+      );
+    };
+    const { spec, source, confidence, codes } = await recognize(
+      frame,
+      { decodeBarcodes, runOcr, isKnownCode },
+    );
 
-    const plan = proposeAssignment(targetSession, spec);
+    const plan = proposeAssignment(targetSession, spec, codes);
     let stackId = plan.stackId;
 
     if (confidence === 'red' || plan.kind === 'ambiguous') {
@@ -118,7 +131,7 @@ async function processCapture(getFrame) {
     // Sitzung bucht das Ergebnis nicht mehr nach.
     if (targetSession !== session) return;
 
-    const entry = commitAssignment(targetSession, spec, source, stackId);
+    const entry = commitAssignment(targetSession, spec, source, stackId, codes);
     view.setLast(describeEntry(spec, entry.stackId));
     syncView();