Merge pull request #27944 from DDmytro:ecc-sanity-update

perf(video): add sanity checks and update ECC baselines for grayscale and color inputs.

modules/video/include/opencv2/video/tracking.hpp

@@ -271,7 +271,7 @@ enum
 /**
 @brief Computes the Enhanced Correlation Coefficient (ECC) value between two images
 
-The Enhanced Correlation Coefficient (ECC) is a normalized measure of similarity between two images.
+The Enhanced Correlation Coefficient (ECC) is a normalized measure of similarity between two images @cite EP08.
 The result lies in the range [-1, 1], where 1 corresponds to perfect similarity (modulo affine shift and scale),
 0 indicates no correlation, and -1 indicates perfect negative correlation.
 

modules/video/perf/perf_ecc.cpp

@@ -55,8 +55,7 @@ PERF_TEST_P(ECCPerfTest, findTransformECC,
                          TermCriteria(TermCriteria::COUNT + TermCriteria::EPS, 5, -1));
     }
 
-    // TODO: Update baseline for new test
-    SANITY_CHECK_NOTHING();
+    SANITY_CHECK(warpMat, 3e-3);
 }
 
 }  // namespace opencv_test