From dadaa2dc25283bc67b18f0b2761286c58f8a9f8f Mon Sep 17 00:00:00 2001
From: pbkx <93405617+pbkx@users.noreply.github.com>
Date: Sun, 20 Sep 2026 17:32:53 -0700
Subject: [PATCH] fix InputArray empty for vector<UMat>

---
 modules/core/src/matrix_wrap.cpp |  2 +-
 modules/core/test/test_mat.cpp   | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/modules/core/src/matrix_wrap.cpp b/modules/core/src/matrix_wrap.cpp
index e7362196c5..dd7922694d 100644
--- a/modules/core/src/matrix_wrap.cpp
+++ b/modules/core/src/matrix_wrap.cpp
@@ -728,7 +728,7 @@ bool _InputArray::empty(int i) const
             CV_Assert((size_t)i < mv->size());
             return mv->at(i).empty();
         }
-        else if (k == STD_VECTOR_MAT) {
+        else if (k == STD_VECTOR_UMAT) {
             auto umv = reinterpret_cast<const std::vector<UMat>*>(obj);
             CV_Assert((size_t)i < umv->size());
             return umv->at(i).empty();
diff --git a/modules/core/test/test_mat.cpp b/modules/core/test/test_mat.cpp
index e0c4074545..f948fc23ae 100644
--- a/modules/core/test/test_mat.cpp
+++ b/modules/core/test/test_mat.cpp
@@ -1415,6 +1415,23 @@ TEST(Core_InputArray, empty)
     ASSERT_TRUE( _InputArray(data).empty() );
 }
 
+TEST(Core_InputArray, element_empty)
+{
+    Mat src = Mat::ones(2, 2, CV_8U);
+
+    std::vector<Mat> mats(2);
+    mats[1] = src;
+    InputArray matInput(mats);
+    EXPECT_TRUE(matInput.empty(0));
+    EXPECT_FALSE(matInput.empty(1));
+
+    std::vector<UMat> umats(2);
+    src.copyTo(umats[1]);
+    InputArray umatInput(umats);
+    EXPECT_NO_THROW({ EXPECT_TRUE(umatInput.empty(0)); });
+    EXPECT_NO_THROW({ EXPECT_FALSE(umatInput.empty(1)); });
+}
+
 TEST(Core_InputArray, convert_from_vector_over2GB)
 {
     applyTestTag(CV_TEST_TAG_MEMORY_6GB);