Merge pull request #3646 from Dhanwanth1803:latch

Fixes #25081:Latch input corruption fix #3646

Fixes opencv/opencv#25081

As mentioned by WennPaper making it `grayImage = image.clone();` will make a deep copy. It prevents the `InputArray` from being modified.

- [X] I agree to contribute to the project under Apache 2 License.
- [X] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [X] The PR is proposed to the proper branch
- [X] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

---
Co-authored-by: Dhanwanth1803 <dhanwanthvarala@gmail,com>
Co-authored-by: Dmitry Kurtaev <[email protected]>

Author: Dhanwanth1803

Diff for: modules/xfeatures2d/src/latch.cpp

@@ -519,7 +519,7 @@ namespace cv
             switch (image.type())
             {
             case CV_8UC1:
-                grayImage = image;
+                grayImage = sigma_ ? image.clone() : image;
                 break;
             case CV_8UC3:
                 cvtColor(image, grayImage, COLOR_BGR2GRAY);