Zdenek Hrazdira developed an iterative phase correlation enhancement for subpixel image registration in the opencv/opencv repository. Leveraging C++ and advanced algorithm development skills, Zdenek introduced iterative refinement to the existing phase correlation method, enabling more accurate and robust subpixel shift estimation in image processing workflows. The implementation included comprehensive accuracy and performance tests, with supporting data integrated into the opencv_extra repository to validate the enhancement. Documentation and sample usage were updated to reflect the new workflow, ensuring clarity for downstream users. This work deepened OpenCV’s core image registration capabilities, focusing on feature delivery and thorough validation over bug fixes.