fixes #25081:Latch input corruption fix

[Dhanwanth1803]

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.

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• 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
• The PR is proposed to the proper branch
• 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

[dkurt]

add a link to the issue

[asmorkalov]

👍

memory can be optimized

[dkurt]

GaussianBlur is called only for sigma != 0.0. So clone only then.

[Dhanwanth1803]

GaussianBlur is called only for sigma != 0.0. So clone only then.

Sir, In that case will this work?
case CV_8UC1:
if (sigma_ != 0.) grayImage = image.clone();
break;