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Modification of the method of detecting and describing keypoints SIFT for optical-to-SAR image registration

© 2022 V. V. Volkov

Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Institutskiy per., 9, Russia
Institute for Information Transmission Problems (Kharkevich Institute) RAS, 127051 Moscow, Bolshoy Karetny per., 19, Russia

Received 28 Apr 2022

Image registration is the alignment (i.e. finding a general coordinate system) of two or more images of the same scene. Complex case of this task is the multimodal image registration, for example, optical-to-SAR. The need for such registration appeared in image fusion and object detection. One of the ways for image registration is to detect keypoints, calculate descriptor for each keypoint and form keypoints pairs by comparing descriptors. Further, the geometric transformation between two images is calculated by geometric model. In this paper modifications for the algorithm of detection SIFT keypoints was evaluated for optical-to-SAR image registration. Additionally, in this paper a modification of the SIFT descriptor was proposed and compared with SIFT descriptor. Image distortions is considered to be only shifts. All studies were carried out on a published dataset of 100 aligned pairs of optical-SAR images.

Key words: image registration, repeatability of keypoints, description of keypoints

DOI: 10.31857/S0235009222040060

Cite: Volkov V. V. Modifitsirovanie metoda poiska i deskribirovaniya ustoichivykh tochek sift dlya sopostavleniya opticheskikh i radiolokatsionnykh izobrazhenii [Modification of the method of detecting and describing keypoints sift for optical-to-sar image registration]. Sensornye sistemy [Sensory systems]. 2022. V. 36(4). P. 349–365 (in Russian). doi: 10.31857/S0235009222040060

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