From 41ff4e4caddfea988b35e3237d3954e3486e262b Mon Sep 17 00:00:00 2001
From: Pierre-Yves Nicolas <6371790+pynicolas@users.noreply.github.com>
Date: Thu, 18 Sep 2025 12:45:23 +0200
Subject: [PATCH] Remove dilation in segmentation mask refinement (#29) This
 produces cleaner edges for flat documents.

---
 app/src/main/java/org/fairscan/app/DocumentDetection.kt | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/app/src/main/java/org/fairscan/app/DocumentDetection.kt b/app/src/main/java/org/fairscan/app/DocumentDetection.kt
index c16a506..8ab82ad 100644
--- a/app/src/main/java/org/fairscan/app/DocumentDetection.kt
+++ b/app/src/main/java/org/fairscan/app/DocumentDetection.kt
@@ -89,12 +89,7 @@ fun refineMask(original: Mat): Mat {
     val opened = Mat()
     Imgproc.morphologyEx(closed, opened, Imgproc.MORPH_OPEN, kernelOpen)
 
-    // Step 3: Light dilation (connects almost touching parts)
-    val kernelDilate = Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, Size(5.0, 5.0))
-    val dilated = Mat()
-    Imgproc.dilate(opened, dilated, kernelDilate, org.opencv.core.Point(-1.0, -1.0), 1)
-
-    return dilated
+    return opened
 }
 
 fun extractDocument(originalBitmap: Bitmap, quad: Quad, rotationDegrees: Int): Bitmap {