From 5811631c4f9a182dbfeb4f895ceb48abe2999f5c Mon Sep 17 00:00:00 2001
From: Joe Knapper <jaknapper@hotmail.com>
Date: Mon, 29 Jun 2026 12:21:32 +0100
Subject: [PATCH] Stitch 2 images

---
 .../things/smart_scan.py                              | 11 +++++------
 .../galleryComponents/galleryCard.vue                 |  2 +-
 .../tabContentComponents/galleryContent.vue           |  2 +-
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/src/openflexure_microscope_server/things/smart_scan.py b/src/openflexure_microscope_server/things/smart_scan.py
index d22cb55f..df511795 100644
--- a/src/openflexure_microscope_server/things/smart_scan.py
+++ b/src/openflexure_microscope_server/things/smart_scan.py
@@ -385,9 +385,8 @@ class SmartScanThing(OFMThing):
         if self._preview_stitcher is None:
             # This scan can't stitch.
             return
-        # Assume 4 images means at least one offset in x and y, making the stitching
-        # well constrained.
-        if self.scan_data.image_count > 3 and not self._preview_stitcher.running:
+        # Begin stitching once two images are captured
+        if self.scan_data.image_count >= 2 and not self._preview_stitcher.running:
             self._preview_stitcher.start()
 
     @_scan_running
@@ -522,8 +521,8 @@ class SmartScanThing(OFMThing):
     @_scan_running
     def _perform_final_stitch(self) -> None:
         """Update the scan zip and perform final stitch of the data."""
-        if self.scan_data.image_count <= 3:
-            self.logger.info("Not performing a stitch as 3 or fewer images taken")
+        if self.scan_data.image_count <= 1:
+            self.logger.info("Not performing a stitch as not enough images captured")
             return
 
         self.ongoing_scan.zip_files()
@@ -737,6 +736,6 @@ class SmartScanThing(OFMThing):
         # Use the scan list (the data read by the gallery) to find any scans that
         # need stitching.
         for scan in self.get_data_for_gallery():
-            if scan.dzi is None:
+            if scan.dzi is None and scan.number_of_images >= 2:
                 self.logger.info(f"Stitching {scan.name}")
                 self.stitch_scan(scan_name=scan.name)
diff --git a/webapp/src/components/tabContentComponents/galleryComponents/galleryCard.vue b/webapp/src/components/tabContentComponents/galleryComponents/galleryCard.vue
index 1d69591b..f53e93be 100644
--- a/webapp/src/components/tabContentComponents/galleryComponents/galleryCard.vue
+++ b/webapp/src/components/tabContentComponents/galleryComponents/galleryCard.vue
@@ -62,7 +62,7 @@
           <li>Duration: {{ formatDuration(itemData.duration) }}</li>
         </ul>
         <ul>
-          <li v-if="itemData.number_of_images < 3" class="warning-msg">
+          <li v-if="itemData.number_of_images < 2" class="warning-msg">
             Not enough images to stitch
           </li>
           <li v-else-if="!itemData.dzi && itemData.stitch_available" class="alert-msg">
diff --git a/webapp/src/components/tabContentComponents/galleryContent.vue b/webapp/src/components/tabContentComponents/galleryContent.vue
index 65da50bd..2a2e72c6 100644
--- a/webapp/src/components/tabContentComponents/galleryContent.vue
+++ b/webapp/src/components/tabContentComponents/galleryContent.vue
@@ -203,7 +203,7 @@ export default {
           return;
         }
         all_items.forEach((item) => {
-          item.can_stitch = !item.stitch_available && item.number_of_images > 3;
+          item.can_stitch = !item.stitch_available && item.number_of_images > 1;
         });
         all_items.sort((a, b) => {
           return b.created - a.created;