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imgproc: Extended spatialGradient API and applied to different detector algorithms - #29273 imgproc: Add fused Sobel2D gradient API and use it in different detector algorithms Add a public Sobel2D API computing dx/dy in a single fused pass with 3x3 and 5x5 kernels (SIMD-dispatched). The float (CV_32F) path folds the output scale and float store into the kernel, avoiding a separate convertTo pass. - Add runtime SIMD dispatch for the Canny edge path. - Integrate fused Sobel2D into: - Canny - cornerEigenValsVecs (cornerHarris, cornerMinEigenVal, cornerEigenValsAndVecs, goodFeaturesToTrack) - GeneralizedHough - IntelligentScissors - HoughCircles - Add performance and accuracy tests. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [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 - [ ] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake
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